Daniel Cozak

Daniel Cozak
Cozak Consultant inc. · R&D

Doctor of Philosophy
semi-retired.

About

34
Publications
567
Reads
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610
Citations
Citations since 2016
0 Research Items
58 Citations
2016201720182019202020212022051015
2016201720182019202020212022051015
2016201720182019202020212022051015
2016201720182019202020212022051015

Publications

Publications (34)
Article
The double bond hydrogenation at NTP catalysed by both natural short fibre chrysotile asbestos and (η5-C5H5)2TiCl treated fibres is reported for some linear and cyclic olefins.
Article
The paramagnetic 1H nmr spectra for manganocene (1) and 1.1′-dimethylmanganocene (2), and the 13C nmr spectra for 1,1′-diethylmanganocene (3) have been recorded in toluene solvent over a −90 to 90 °C temperature range. 1 shows a low field and a high field ring proton resonance in its spectrum near −59 °C. At higher temperatures the low field resona...
Article
The reaction of CpTi(CO)2 (1), Cp2TiCl (2), and Cp2TiCl2 (3) (Cp = η5-C5H5) with purine (PuH) and adenine (AdH) in organic solvents is described. The compound 1 reacts with both molecules in an oxidative fashion giving Cp2Ti(C5H3N4)(C5H4N4) (4) and (Cp2Ti)2(C5H3N5) (5) with concomitant liberation of molecular carbon monoxide and hydrogen (4:1) foll...
Article
Full-text available
A method is proposed for the preparation of Ru/ZSM-5 catalysts using substituted and non-substituted ruthenocenes. To this end, the following complexes have been synthesized and characterized: dimethyl-1,1′; diphenyl-1,1′; dibenzoyl-1,1′, and monobenzoyl ruthenocene. Results of ESC A intensity ratio and ir of adsorbed pyridine show differences in t...
Article
The 13C nmr shielding effect at the carbonyl ligands due to the paramagnetic current in the non-bonding d orbitals of the metal in the group VIB M(CO)6 complexes has been evaluated. For these complexes, the only contribution of significant importance to the chemical shielding calculated for the carbonyl ligands is opposite to that observed experime...
Chapter
Dicarbonyl-(η6-o-dimethylbenzene)(thiocarbonyl)-chromium(0) Dicarbonyl(methylη6-benzoate)(thiocarbonyl)-chromium(0) Dicarbonyl(methylη6-m-methylbenzoate)(thiocarbonyl)chromium(0) Carbonyl(methylη6-m-methylbenzoate)(thiocarbonyl)(triphenyl phosphite)chromium(0)
Chapter
Carbonyl(η5-cyclopentadienyl)(thiocarbonyl)(triphenylphosphine)managanese(I) [1,2-Bis(Diphenylphosphino)ethane](η5-cyclopentadienyl)-(thiocarbonyl)managanese(I)
Article
A crossover enthalpy of ΔH° = 21 ± 5 kJ/mol (ΔS° = 100 ± 20 J/(mol K)) for the slow spin exchange involving the 6A1g2E2g ground state of manganocene was found by paramagnetic NMR spectroscopy. A theoretical expression was derived which accounts for the average isotropic NMR shift in rapid exchanging molecules. In the case of dimethylmanganocene a f...
Article
The NMR paramagnetic shifts and the calculated proton and carbon hyperfine coupling constants are reported for (η5-C5H5)2TiCl2Al(X)(C2H5), X = C2H5 (I) and Cl (II). The reaction of (η5-C5H5)2TiCl with HAl(C2H5)2 (1:2) was followed by NMR. A transient species believed to be the Shilov type bimetallic monomeric hydride was observed. The spectrum of t...
Article
The title qomplex (I) is prepared by reaction of bis(cyclopentadie nyl)- dicarbonyl-Ti(II) with theophylline in refluxing toluene or of chloro-bis(cyclopentadienyl)-Ti(III) with sodium theophyllinate, generated in situ from NaH, in refluxing THF.
Article
The theophylline-titanium(III) complex (η5-C5H5)2(theophyllinato)Ti was prepared by using either (η5-C5H5)2Ti(CO)2 or (η5-C5H5)2TiCl as starting material. The titanocene structure is preserved in the complex. The crystals belong to the monoclinic space group P21/c, with a = 7.869 (5) Å, b = 7.745 (6) Å, c = 26.86 (2) Å, β = 100.37 (6)°, and Z = 4....
Article
This review covers the coordination complexes of aluminium and complements two companion reviews on the heterometallic and organic complexes, respectively. There are over five hundred, mostly colourless, coordination compounds of aluminium (III) with one example each of the +1 and +2 oxidation states. Tetrahedral and octahedral geometries are the m...
Chapter
The catalytic properties of (C 5H 5) 2 TiCl and TiCl 3 reacted short fibre asbestos chrysotile are presented. The chrysofile-titanocene fibre is highly selective for the hydrogenation of linear olefins and shows good hydrogenation rates for monoolefins over diolefins. Also, both the titanocene fibre and the chrysotile-TiCl x fibre are moderately ac...
Article
Die I :2-molare Umsetzung von Titanocendichlorid mit Purin in Gegenwart von zwei Äquivalenten Triethylamin in siedendem THF unter N2 führt zu dem Titelkomplex (I).
Article
(η5-C5H5)2TiCl2 shows significant antitumor activity and the title compound was investigated as a possible model for a species initially formed between titanocene dichloride and a purine base of DNA. The (η5-C5H5)2TiCl(C5H3N4) complex was prepared by refluxing the dichloride with purine in the presence of triethylamine in THF. The crystals are mono...
Article
The reaction products of chrysotile asbestos with titanium trichloride in organic and aqueous media are described. The titanium(III) acidity in H 2 O solution is sufficiently strong to cause fiber lixiviation and unrollment. The reaction product of the water reacted fiber is an amorphous titanium containing silicate. A series of reactions with TiCl...
Article
The 13C NMR spectra of the five series of chalcocarbonyl complexes, (η6-C6H6)Cr(CO)2(CX), (η6-C6H5CO2Me)Cr(CO)2(CX), (η5-C5H5)Mn(CO)2(CX), (η5-C5H4Me)Mn(CO)2(CX) and (η5-C5H5)Re(CO)2(CX) (X = O, S, Se), and some of their derivatives including several 13C-enriched species have been investigated at −30 to −50°C. The chemical shift variations observed...
Article
The 13C and 17O NMR spectra of a series of arenechromium(0) complexes, (η-6C6H6−nRn) Cr(CO)2)(CX) (R = H, Cl,Me, OMe, NH2, NME2, CO2Me; X = O, S; n = 0−3), have been measured at 30°C in CH2Cl2 solution. Linear regression analyses relating the observed 13C and 17O chemical shifts of the CO and CS ligands with the approximate primary CX stretching fo...
Article
Full-text available
From [(RC5H4)2TiCl]2, R = H (1), CH3 (2) and C2H5 (3), (C5H5)2TiBH4 (4) and (C5H5)2Ti(CH3CN)Cl (5) the first paramagnetic 13C and 1H NMR spectra in the series of bent titanocenes have been obtained. Broad signals shifted to low field originate from the cyclopentadienyl protons while the corresponding 13C signals appear at high field relative to a d...
Article
Carbon diselenide reacts in the presence of PPh3 with (η5-C5H4R)M(CO)2(THF) (M = Mn, R = H, Me; M = Re, R = H) or (η6-C6H5CO2Me)Cr(CO) 2(THF) to give the new selenocarbonyl complexes, (η5-C5H4R)M(CO)2(CSe) and (η6-C6H5CO2Me)Cr(CO) 2(CSe), and PPh3Se. The spectroscopic properties (IR and 1H NMR) of these complexes indicate that CSe is a better net e...
Article
Reaction of (η5-C5H4R)M(CO)2(THF) (M = Mn, R = H, Me; M = Re, R = H), formed in situ by the UV irradiation of THF solutions of the corresponding tricarbonyl complexes, with CS2/PPh3 affords (η5-C5H4R)M(CO)2(CS) and PPh3S. Similar reactions of (η6-C6H5R)Cr(CO)2(THF) (R = H, CO2Me) with CS2 alone yield (η6-C6H5R)Cr(CO)2(CS); the fate of the other sul...
Article
Full-text available
Recently, we reported the discovery of the first examples of transition metal selenocarbonyl complexes, (n5-C5H5) Mn (CO)2 (CSe) and (n6-C6H5CO2CH2(CO)2 (CSe).1 These complexes are particularly interesting because, unlike CO and CS, the diatomic CSe molecule has so far eluded isolation even at very low temperatures,2 and so these complexes represen...
Article
Carbon diselenide react in the presence of PPh3 with (π-C5H5)Mn(CO)2(THF) or (π-C6H5CO2Me)-Cr(CO)2(THF) to give (π-C5H5)Mn(CO)2(CSe) and (π-C6H5CO2Me)Cr(CO)2(CSe), the first examples of transitionmetal selenocarbonyls.
Article
The olefins were polymerized in the presence of titanium-containing fibres prepared by the reaction of chrysotile with titanium trichloride or dicyclopentadienyl titanium chloride. The products were found to be polyolefin-covered fibres. Polyethylene had the same melting point as the high-density polymer.

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