Peter Jutzi's research while affiliated with Bielefeld University and other places

Publications (305)

Article
In the flourishing chemistry of divalent silicon, π-complex formation between silicon and the pentamethylcyclopentadienyl (Cp*) group is one of the successful strategies for thermodynamic and/or kinetic stabilization. Here, the diverse reactivity of the [Cp*Si]+ ion is described. Its chemistry is characterized by the addition of anionic and neutral...
Article
In the presence of ionic compounds, the thermal decomposi-tion of octacarbonyldicobalt, Co 2 (CO) 8 , in an inert solvent leads exclusively to ε-Co nanocubes. The ionic species can be added directly or generated in situ by a chemical reaction
Article
The Cp*Si(+) cation acts as a stoichiometric source of silicon in the reaction with the disilenide Tip(2)Si=Si(Tip)Li (Tip = 2,4,6-(i)Pr(3)C(6)H(2)) affording known neutral unsaturated silicon clusters. It thereby provides a conceptually different approach to this novel class of compounds. The proposed mechanism involves a Cp*-substituted cyclotris...
Article
SiSi activation: Reversible formation of a donor-acceptor complex between an N-heterocyclic carbene and a cyclotrisilene with carbon-based substituents shifts the electron density of the double bond and thus induces strong polarization, as shown by the significantly pyramidal tricoordinate silicon atom.
Article
SiSi‐Aktivierung: Die reversible Bildung eines Donor‐Akzeptor‐Komplexes zwischen einem N‐heterocyclischen Carben und einem Cyclotrisilen mit C‐Substituenten verschiebt die Elektronendichte der Doppelbindung und induziert somit eine starke Polarisierung, wie durch das signifikant pyramidale dreifachkoordinierte Siliciumatom verdeutlicht wird.
Article
Routes are presented for synthesizing nano- and mesostructured β-tin particles in the form of monocrystalline spheres, cubes, and bars, as well as polycrystalline rods and needles, by the decomposition of decamethylstannocene in organic solvents under various conditions. The formation of the observed shapes is based on the presence of liquidlike an...
Article
The fundamental question of how silicon handles antiaromaticity in four-membered ring systems has been answered by the synthesis and characterization of the first tetrasilacyclobutadiene Si4Ar 4 (1) and by the first dimeric silaisonitrile Si 2(NAr′)2 (2). Compound 1 is best described by the charge-separated resonance structure 1′ and 2 by a structu...
Article
Der ungewöhnliche Katalysator Cp*Si+ kann Oligo(ethylenglycol)-Diether RO(CH2CH2O)nR abbauen (siehe Schema). An seiner offenen Si-Koordinationssphäre können bis zu vier Si-O-Kontakte gebildet werden. Kristallstrukturdaten der reaktiven Verbindungen [Cp*Si(dme)]+BR4− und [Cp*Si([12]Krone-4)]+BR4− (R=C6F5) zeigen schwach gebundene Ethermoleküle.
Article
Thermal decomposition of a metastable silane in nanoporous alumina leads to the formation of luminescent silicon nanostructures. While varying the pore size of the transparent membranes the luminescence can be shifted from 504 nm up to 537 nm by building up a sheet-like structure of siloxene on the inner pore surface.
Article
Reaction of the (pentamethylcyclopentadienyl)silicon cation with the (pentamethylcyclopentadienyl)dicarbonylferrate anion leads to the formation of the crystalline, thermolabile silicon(II) compound [(η5-pentamethylcyclopentadienyl)dicarbonylferrio](η3-pentamethylcyclopentadienyl)silicon. The singlet−triplet energy difference ΔEST is calculated to...
Article
Full-text available
Ab-initio calculations have been performed for the half-sandwich cation [(Me5C5)Si]+ and its DME complex [(Me5C5)Si(DME)]+. For these cations, the ground state energies, the complexation energy, the frontier orbitals, the vertical singlet-triplet excitation energies, and the natural atomic charges have been calculated. In both cations, the “lone-pa...
Article
The introduction of an aminoethyl side chain into cyclopentadienyl compounds of many d-block elements leads to interesting changes in structure and reactivity compared to the parent species: (i) A hemilabile bonding situation is observed in complexes with low-valent transition-metal centers; (ii) amino-group coordination to an adjacent metal or non...
Article
The development of a simple piece of equipment for monitoring chemical reactions by NMR (nuclear magnetic resonance) spectroscopy is reported. The kit provides full control of the reaction temperature at any time and can be operated in the temperature range from −80 to 130 °C. The core component is a double-chamber coaxial tube consisting of a 5 mm...
Article
Full-text available
The compounds 1,3-bis(diethylgallyl)benzene (3) and 1,4- bis(diethylgallyl)benzene (6) were prepared by reaction of the corresponding chloromercuriobenzenes with an excess of triethylgallium by applying pressure and higher temperatures. These compounds very easily undergo redistribution reactions in solution and in the solid state. Extremely air-se...
Article
The salt (eta(5)-pentamethylcyclopentadienyl)silicon(II) tetrakis(pentafluorophenyl)borate (5) reacts at -78 degrees C with lithium bis(trimethylsilyl)amide in dimethoxyethane (DME) as solvent to give quantitatively the compound [bis(trimethylsilyl)amino][pentamethylcyclopentadienyl]silicon(II) 6A in the form of a colorless viscous oil. The reactio...
Article
The reaction of dichloro(methyl)silane, dichloro(phenyl)silane or dichloro(dimethyl)silane with one equivalent of the lithiated aryl pincer ligands [2,6-(DoCH2)2H3C6]Li leads to the chlorosilanes [2,6-(DoCH2)2H3C6]SiRR′Cl 1–6, respectively, as thermolabile oily compounds. Treatment of 1–6 with trimethylsilyl triflate leads to the crystalline ionic...
Article
Benzene derivatives containing dimethylgallyl substituents in 1,3- (compounds 5 and 6), 1,4- (compound 9), and 1,3,5-position (compound 12) were prepared by reaction of the corresponding chloromercuriobenzenes with an excess of trimethylgallium at higher temperatures. These compounds decompose in solution at room temperature and in the solid state...
Article
Reaction of the Cp*Si+ cation with the β-diketiminato anion [HC(CMeNAryl)2]− (Aryl = 2,6-iPr2C6H3) did not lead to the expected silicon(II) compound Cp*[HC(CMeNAryl)2]Si (3) but to the constitutional isomer 7 containing a silicon(IV) center. Calculations were performed for 3, for the conformational isomer 3* containing a η3-Cp* ligand, and for less...
Article
Als „Lagerform“ eines echten Silylens mit σ-gebundener Cp*-Gruppe lässt sich 1, die erste arylsubstituierte monomere Silicium(II)-Verbindung, betrachten, deren Synthese und vollständige Charakterisierung ein sperriger σ-gebundener Terphenylsubstituent und ein π-gebundener Cp*-Ligand ermöglichten. Die Konformation der Arylgruppe verhindert eine Aryl...
Article
Full-text available
The etherification of the hydroxyl group of citric acid with saturated and unsaturated long-chain alkyl groups is described. This is a new approach to polydentate acids which may serve as ligands for metal or metal oxide nanoparticles. For this purpose we developed a synthetic route to long-chain ω-unsaturated alcohols and their triflate derivative...
Article
Si takes a rest: A bulky sigma-bound terphenyl substituent and a pi-bound Cp* ligand enable the isolation and full characterization of the first aryl-substituted, monomeric silicon(II) compound 1, which can be regarded as the "resting state" of a true silylene containing a sigma-bound Cp* group. The conformation of the aryl group prevents aryl-Si p...
Article
Treatment of diphenylmercury with an excess of trimethylgallium at higher temperatures resulted in the formation of dimethyl(phenyl)gallium (1). Similarly, reaction of 1-chloromercurio(4-methylbenzene) and 1-chloromercurio(4-tert-butylbenzene) with an excess of trimethylgallium gave dimethyl(4-methylphenyl)gallium (2) and dimethyl(4-tert-butylpheny...
Chapter
For several reasons, complexes with a transition metal-silicon bond are of special interest. A new and very convenient synthesis of molybdenum-silicon compounds is presented. The complexes Cp2Mo(H)SiBr3 (1) and Cp2Mo(H)Si2Cl5 (2) are formed by simply stirring a solution of Cp2MoH2 in toluene in the presence of the corresponding halogenosilane. The...
Chapter
Decamethylsilicocene (1), the first Si(II) compound stable under ordinary conditions [1], is a hypercoordinated nucleophilic silylene, which reacts preferentially with electrophilic substrates [2]. In the reaction of 1 with the electrophilic heterocumulenes CO2, COS and RNCS (R = Me, Ph), double bond species of the type Cp*2SiX (X = O, S) are forme...
Chapter
Silyl triflates containing organosilicon cations stabilized by the 2,6–bis(methoxymethyl)phenyl or by the 2,6–bis(methylthiomethyl)phenyl ligand have been prepared starting from the corresponding chlorosilanes. Ionic structures are found in solution as well as in the solid state. The cations all show a trigonal bipyramidal geometry at silicon in th...
Chapter
The synthesis and structure of octakis[4–(trimethylsilylethynyl)phenyl]-octasilsesquioxane (l), the first representative of a new class of octasilsesquioxanes bearing ridid π-conjugated substituents, is described. Furthermore we present the synthesis and structure of octakis(tetracarbonylcobaltio)octasilsesquioxane (2). In combination with tripheny...
Chapter
IntroductionSynthetic ProceduresCharacterization FeaturesDimersCp-Element Orbital InteractionsMetallocenes of the Alkali MetalsMetallocenes of the Alkaline Earth MetalsMetallocenes of the Group 13 ElementsMetallocenes of the Group 14 ElementsMetallocenes of the PnictogensFactors Governing the Structure of Multicyclopentadienyl ComplexesConclusions...
Chapter
Silyl triflates containing organosilicon cations stabilized by the 2,6–bis(methoxymethyl)phenyl or by the 2,6–bis(methylthiomethyl)phenyl ligand have been prepared starting from the corresponding chlorosilanes. Ionic structures are found in solution as well as in the solid state. The cations all show a trigonal bipyramidal geometry at silicon in th...
Chapter
The synthesis and structure of octakis[4–(trimethylsilylethynyl)phenyl]-octasilsesquioxane (l), the first representative of a new class of octasilsesquioxanes bearing ridid π-conjugated substituents, is described. Furthermore we present the synthesis and structure of octakis(tetracarbonylcobaltio)octasilsesquioxane (2). In combination with tripheny...
Chapter
For several reasons, complexes with a transition metal-silicon bond are of special interest. A new and very convenient synthesis of molybdenum-silicon compounds is presented. The complexes Cp2Mo(H)SiBr3 (1) and Cp2Mo(H)Si2Cl5 (2) are formed by simply stirring a solution of Cp2MoH2 in toluene in the presence of the corresponding halogenosilane. The...
Chapter
Decamethylsilicocene 1 is reacted with main group element halides and organo-substituted derivatives. Reduction takes place with GaX3 and InX3 (X= C1, Br) to form the corresponding monohalides and Cp*2SiX2 4a, b (Cp*= 1, 2, 3, 4, 5-Penta-methylcyclopentadienyl). Cp* transfer occurs with AlX3 (X= C1, Br), Me2AlC1, InCl, EC12 (E= Ge, Sn, Pb) and EC13...
Chapter
The thermal and photochemical reactivity of divalent silicon species, decamethylsilicocene (Cp*2Si) and 1, 3-di-teri-butyl-1, 3, 2-diazasilol-2-ylidene (SiLN2), towards Cp2MH2 (M = Mo, W) and Cp2Mo(PEt3) is investigated. In the case of Cp*2Si no conversion of the silicon(II)-species is observed. This is attributed to the high steric demand of the b...
Chapter
dihalogeno;decamethylsilicocene;geometrical isomers;pentamethylcyclopentadienyl;tetrafluoroboric acid
Chapter
Decamethylsilicocene (1), the first Si(II) compound stable under ordinary conditions [1], is a hypercoordinated nucleophilic silylene, which reacts preferentially with electrophilic substrates [2]. In the reaction of 1 with the electrophilic heterocumulenes CO2, COS and RNCS (R = Me, Ph), double bond species of the type Cp*2SiX (X = O, S) are forme...
Article
The synthesis and structure of novel 3,3,3-trifluoropropyl substituted cyclopentadienes (2/3) and of their zirconocene dichloride derivatives [Zr(η5-C5H4C2H4CF3)2Cl2] (6) and [Zr{η5-C5H3-1,2-(C2H4CF3)2}2Cl2] (7) is reported. These precatalysts have been investigated toward their properties in the methylaluminoxane (MAO) assisted polymerization of e...
Article
Reaction of pentamethylcyclopentadienyl(pentachloro)disilane (2), prepared from hexachlorodisilane and potassium pentamethylcyclopentadienide (Cp*K), with a further equivalent of Cp*K leads selectively to the title compound Cp* 2 Si 2 Cl 4 (3) which was characterized by NMR and X-ray structural data. Dehalogenation of 3 with four equivalents of sod...
Article
The pentamethylcyclopentadienylsilicon(II) cation, Me5C5Si+, opens up access to novel silicocene derivatives; the penta-iso-propylcyclopentadienylsilicon(II) cation, iPr5C5Si+, is obtained by reaction of the mixed silicocene (iPr5C5)(Me5C5)Si with H(OEt2)2+ Al[OC(CF3)3]4-.
Article
Novel amphiphilic trithiolates possess excellent properties for gold nanoparticle (AuNP) stabilization and functionalization and cannot be replaced by exchange reactions.
Article
The trinuclear ferrocenophane [{Fe(eta(5)-C(5)H(4))(3)}(2)Ga(2)] (3) featuring two sp(2)-hybridized gallium atoms in bridging positions between three ferrocene-1,1'-diyl units represents a novel type of ferrocene derivative. Compound 3 is obtained by thermal treatment of 1,1'-bis(dimethylgallyl)ferrocene (1) in nondonor solvents or in diethyl ether...
Article
1‐tert‐Butyl‐2,4,6‐tris(trimethylsilyl)‐1‐silabenzol (4) und 1‐tert‐Butyl‐2,6‐bis(isopropyldimethylsilyl)‐4‐(trimethylsilyl)‐1‐silabenzol (6) entstehen durch Hochvakuumpyrolyse aus den entsprechenden Silacyclohexadien‐Vorstufen 3 und 5 unter Abspaltung von Methyl(trimethylsilyl)ether und werden bei tiefen Temperaturen UV‐ und IR‐spektroskopisch nac...
Article
Mit sperrigen Liganden und guten Abgangsgruppen versehene Silacyclohexadiensysteme sind für Versuche zur Darstellung von kinetisch stabilisierten Silabenzolderivaten von Interesse. Wir berichten hier über Synthesen von in 1-, 2-, 4- und 6-Stellung substituierten 1-tert-Butyl-1-silacyclohexadienen. Aus lithiierten Vorstufen entstehen durch Substitut...
Article
1-Sila-2,4-cyclohexadien (1) reagiert mit tert-Butyllithium zu 1-tert-Butyl-1-sila-2,4-cyclohexadien (3), welches durch Substitutionsreaktionen in 1-tert-Butyl-1-chlor- (2) und 1-tert-Butyl-1-methoxy-1-sila-2,4-cyclohexadien (4) übergeführt werden kann. Silylierungsreaktionen an den Pentadiensystemen 2, 3 und 4 führen zu den mono(5, 6, 7)-, bis(8,...
Article
Das vollständige Manuskript dieser Zuschrift erscheint in: Angew. Chem. Suppl. 1982, 25. DOI: 10.1002/ange.198200250
Article
We report on the synthesis of the amphiphilic molecules 1,1,1-tris(mercaptomethyl)undecane and 1,1,1-tris(mercaptomethyl)dec-9-ene starting from the corresponding tris(hydroxymethyl) compounds. In addition we describe the synthesis of an amphiphilic phosphite ligand possessing only one alkyl chain. These compounds are potential substrates for the m...
Article
Reactions of hexanuclear carbonyl clusters of rhodium Rh6(CO)16 and ruthenium Ru6(η6-C)(µ2-CO)(CO)16 with GaCp* (Cp* = C5Me5) in the mild conditions result in substitution of CO ligands and formation of the Rh6(CO)12(µ3-GaCp*)4 and the Ru6(η6-C)(µ2-CO)(CO)13(µ3-GaCp*)2(µ2-GaCp*) cluster derivatives.
Article
The donor-free 9,10-dialkyl-9,10-dihydro-9,10-digallaanthracenes 1 (alkyl: methyl) and 2 (alkyl: ethyl) were prepared by reaction of 1,2-di(chloromercurio)benzene with the corresponding trialkylgallium and isolated as colourless air- and moisture sensitive crystalline compounds. In the solid-state structure of 1, two slightly different monomers 1A...
Article
Calculated magnetophoretic mobility of a variety of magnetic compounds has identified FeCo to be an alternative for magnetite in in vitro biological cell separations. The synthesis of FeCo nanoparticles and the resulting microstructure is discussed as a function of the particle size. Their synthesis kinetics is modeled using a consecutive decomposi...
Article
Analytical transmission electron microscopy is a proper method so as to uncover microstructure and composition of novel magnetic nanocrystals potentially used as biological markers. The focus of this study is the preparation and characterization of the (Fe1-xCox)(1-y)Pt-y alloyed nanoparticles utilizing high-resolution transmission electron microsc...
Article
The best way to achieve a virgin state of a magnetized sample is to heat it up to a temperature high enough to destroy every magnetic order and thereafter cooling it down in a zero magnetic field. This procedure is often not possible because high temperatures may cause irreversible changes in the sample's constitution e. g. by crystallization in am...
Article
Full-text available
Magnetoresistive biosensors use a new detection method for molecular recognition reactions based on two recently developed techniques and devices: Magnetic markers and XMR sensors, where XMR means either giant magnetoresistance (GMR) or tunneling magnetoresistance (TMR). The markers are specifically attached to the target molecules, and their magne...
Article
Paramagnetic carriers, which are linked to antibodies enable highly specific biological cell separations. With the colloidal synthesis of superparamagnetic Co and FeCo nanocrystals with superior magnetic moments the question about their potential to replace magnetite as the magnetically responsive component of magnetic beads is addressed. Starting...
Article
The reaction of decamethylsilicocene, (Me5C5)2Si, with the proton-transfer reagent Me5C5H2+ B(C6F5)4– produces the salt (Me5C5)Si+ B(C6F5)4 (2), which can be isolated as a colorless solid that is stable in the absence of air and moisture. The crystal structure reveals the presence of a cationic π complex with an η5-pentamethylcyclopentadienyl ligan...
Article
This chapter discusses the synthesis, structure, bonding and chemistry of decamethylsilicocene. The decamethylmetallocenes of germanium, tin and lead as well as the parent metallocenes are prepared by reaction of divalent inorganic substrates (usually halides) with the corresponding cyclopentadienyl transfer agents (usually alkaline metal derivativ...
Article
Chiral amino-functionalized silicon-bridged indene derivatives 4a–4c were synthesized from 3-(2-(N,N-dialkylamino)ethyl)indenes 2a–2c. The C-Si coupling reactions are regioselective, leading exclusively to the formation of 1,3-disubstituted isomers in a rac/meso ratio of 1:1, as indicated by NMR spectroscopy. The solid-state structure of the dimeth...
Chapter
IntroductionCompounds Containing Cyclopentadienyl-silicon σ-bonds Basic Features of Structure and Bonding Silicon Bound to an sp3-hybridized Carbon AtomSilicon Bound to an sp2-hybridized Carbon AtomSynthesis of Compounds with Silicon–Cyclopentadienyl Bonds Silylated CyclopentadienesSilylcyclopentadienyl Metal ComplexesMethods of Silicon–Cyclopentad...
Article
Analysis of Monodispersed FeCo Alloyed Nanoparticles by High-Resolution Transmission Electron Microscopy - Volume 9 Issue S03 - Daniela Sudfeld, Inga Ennen, Wiebke Hachmann, Klaus Wojczykowski, Peter Jutzi, Günter Reiss, Andreas Hütten
Article
Gentle warming of 1,1‘-bis(dimethylgallyl)ferrocene (1) leads to the formation of trimethylgallium and the thermolabile compound [{Fe(η5-C5H4)2}2{GaMe}2] (2), a [1.1]ferrocenophane featuring group 13 elements in bridging positions. While NMR data for 2 prove a dynamic structure in solution, X-ray data reveal an anti conformation of the ferrocenopha...
Article
The microstructural influence of binary melt-spun AuCo and pseudo-binary AlNiCo5 permanent magnets in the optimum magnetic state on the giant magnetoresistance (GMR) have been compared to identify the origin of the magnetotransport in these metal/metal granular systems. In general, their high field GMR dependence is originated from small ferromagne...
Article
Novel oligomeric titanasiloxanes have been synthesized in good yields by reaction of sterically demanding organosilanetriols with titanium alkoxides. The silanetriols tBu2(Me3Si)FlSi(OH)3 (5), (Me3Si)FlSi(OH)3 (6), and MeFlSi(OH)3 (7) and the titanium alkoxides Ti(OEt)4, Ti(OiPr)4, and Ti(OiPr)2(acac)2 have been used as starting materials (Fl = flu...
Article
The reaction of decamethylsilicocene (1) with CpNiCl(PPh3) (4) leads to the silylnickel complex [Cp*2(Cl)Si]NiCp (5), in which an intramolecular π-interaction between a σ-bound Cp* substituent and the nickel atom is observed, in the solid state as well as in solution. Reaction of 1 with gold(I) chloride complexes ClAuL results in the formation of t...
Article
The reaction of ‘GaI’ with potassium cyclopentadienides allows a simple access to cyclopentadienylgallium(I)-complexes. Thus, the compounds Me5C5Ga 1 and Me4EtC5Ga 2 have been prepared in high yields. Performing the synthesis of ‘GaI’ under ultrasonic conditions not in toluene but in benzene as solvent, avoids the formation of benzyl iodide as side...
Article
The paramagnetic heterocycles (R = 2,6-dimethylphenyl (1), 2,4,6-trimethylphenyl (2), and 2,6-diisopropylphenyl (3)) were obtained by reaction of “GaI” with Xyl-dab (N,N‘-bis[2,6-dimethylphenyl]-1,4-diazabuta-1,3-diene), Mes-dab (N,N‘-bis[2,4,6-trimethylphenyl]-1,4-diazabuta-1,3-diene), and Dipp-dab (N,N‘-bis[2,6-diisopropylphenyl]-1,4-diazabuta-1,...
Article
Condensation reactions of cyclopentadienyl silanetriols with titanium alkoxides yield oligomeric titanasiloxanes in high yields. Two types of polyhedral structures can be obtained by small structural modifications at the reactants (CpRSi(OH)3, Ti(OR)4) or by variation of reaction parameters. Thus, reaction of the silanetriols 9-(Me3Si)Fluorenyl-Si(...
Article
The reaction of 1,1‘-bis(trichlorostannyl)ferrocene with trimethylgallium results in the formation of Fe(C5H4GaMe2)2 (1), the first digallylferrocene. An X-ray crystal structure analysis of 1 reveals a polymeric structure. NMR data confirm a monomeric structure of [1·2 donor] in donor solvents. The reaction of 1 with phenazine results in the format...
Article
Cyclopentadienyl compounds of the tetravalent group 14 elements and of the trivalent group 15 elements are characterized by their dynamic behavior due to migration processes of the relevant ElR, fragment. As shown by experiments and calculations, the energy difference between the [sigma]-ground state and the [pi]-transition state in these molecules...
Article
Reactions of hexanuclear rhodium clusters with GaCp* (Cp* = C5Me5) result in unusual substitution of face bridging CO ligands to give a series of the Rh6(μ3-CO)4 − x(μ3-GaCp*)x(CO)12 substituted derivatives.
Article
The preparation and the electrochemical properties of different classes of water soluble ferrocenyl and multiferrocenyl compounds are described. Two strategies have been applied: (1) molecules with up to four redox units have been synthesized by quaternization of 2-(N,N-dimethylamino)ethylferrocene or 1,1′-bis(2-(N,N-dimethylamino)ethyl)ferrocene w...
Article
Structure and bonding in several Stereoisomers of the recently synthesized silyl cation (Me5C5)(2)Si+H (2) and its hydrogen-substituted analogue (C5H5)(2)Si+H (3) has been investigated by quantum-mechanical methods. DFT calculations at the B3LYP/6-311G(2d,p)//B3LYP/6-31G(d)+Delta ZPVE level as well as coupled cluster calculations at the CCSD(T)/6-3...
Article
The novel digallanes (3) (Dipp = 2,6-diisopropylphenyl) and (4) (Dep = 2,6-diethylphenyl) were obtained in quantitative yield by photolysis of the 1-galla-2,5-diazoles (1) and (2), respectively. This alternative approach to the synthesis of digallanes demonstrates the efficiency of the Cp* moiety as the leaving group in the formation of metal−metal...
Article
In the reaction of (η5-pentamethylcylopentadienyl)gallium (Cp*Ga) with B(C6F5)3, GatBu3, and Cp*GaX2 (X = Cl, I) the new complexes Cp*GaB(C6F5)3, 1, Cp*GaGatBu3, 2, and Cp*GaGa(X)2Cp* (X = Cl, 3; I, 4), respectively, were obtained. Alternatively, complex 3 was formed in the reaction of Cp*Ga with InCl. Compounds 1−4 were characterized by analytical...
Article
The heterocycles (1) and (2) were obtained by oxidative addition of (η5-pentamethylcyclopentadienyl)gallium(I) (Cp*Ga) to Dipp-DAB (1,4-bis(2,6-diisopropylphenyl)-1,4-diazabuta-1,3-diene) and Dep-DAB (1,4-bis(2,6-diethylphenyl)-1,4-diazabuta-1,3-diene), respectively. Compounds 1 and 2 are the first examples of monomeric gallium-containing heterocyc...
Article
A molecular carousel, that is the appearance of the structure of the title compound [1·2py] (see picture), the first complex of a new structure type prepared by a highly selective condensation reaction from the equally new complex [Fe(C5H4GaMe2)2]. The first gallium bridged [m.m]ferrocenophane [{Fe(C5H4)2}2{GaMe(C5 H5N)} 2] is formed as an intermed...
Article
Donor substituted carbon- and silicon-bridged zirconocene dichlorides of the type [η5-C13H8-CMe2-η5-C5H3(CH2CH2NR2)]ZrCl2 (R=Me (2a), Et (2b), iPr (2c)) and [η5-C13H8–SiMe2-η5-C5H3(CH2CH2NR2)]ZrCl2 (R=Me (4a), Et, (4b), iPr (4c)) have been prepared. Activation of 2a–c and 4a–c with excess methylalumoxane results in the formation of catalytically ac...
Article
The reaction of decamethylsilicocene 1 with trimethylindium yields the disilyl indium compound [Cp*Si-2(Me)](2)InMe (2) in nearly quantitative yield; 2 is characterised by H-1, C-13 and Si-29 NMR and microanalytical data and by X-ray crystallography.
Article
The new chloro(cyclopentadienyl)silanes Cp′SiHyCl3−y (Cp′=Me4EtC5, y=1: 1; Cp′=Me4C5H, y=1: 2; y=0: 3; Cp′=Me3C5H2, y=1: 4 and pentachloro(cyclopentadienyl)disilanes Cp′Si2Cl5 (Cp′=Me5C55, Me4EtC56, Me4C5H 7, Me3C5H28, Me3SiC5H49) are synthesized in good yields via metathesis reactions. Treatment of 1–9 with LiAlH4 leads under Cl–H exchange to the...