[Show abstract][Hide abstract] ABSTRACT: A rutile topological 3-D metal organic framework (MOF) had been obtained by reacting CdSO4•8/3H2O with HL (HL = 6-aminonicotinic acid) under solvothermal condition. Unique right- or left- handed helices can be found in the architecture of the MOF. The framework can exhibit tunable UV-to-visible fluorescence by variation of excitation light.
[Show abstract][Hide abstract] ABSTRACT: Thin mica-like Yb3+:CsGd(MoO4)2 crystals, with a perfect (100) cleavage plane, have been grown by a top seeded solution growth method from a flux of Cs2Mo3O10. The cleavage habit has been found to be closely connected with the layered structure. The Stark-level positions of Yb3+ have been deduced from the excitation and emission spectra at 77 K with the aid of the Raman spectrum, indicating the largest ground-state splitting among the double molybdates and double tungstates ever reported except for Yb3+:LiLu(WO4)2. The emission cross-sections have been determined by the combinatorial reciprocity method and the Füchtbauer–Ladenburg formula. The wavelength dependence of the gain cross-section predicts a broad tuning range and potential sub-100 fs laser pulse generation. Taking into account the cleavage behavior, the crystal is particularly suitable for microchip lasers, in which thin platelets of gain media can be prepared by a simple cleavage technique.
[Show abstract][Hide abstract] ABSTRACT: The title complex, [CuBr(anp)] n(1)(anp=2-amino-5-nitropyri dine), was synthesized from a solvothermal reaction of anp with CuBr·4H2O, and characterized by single-crystal X-ray diffraction analysis. Complex 1 crystallizes in monoclinic space group P21/c with a = 3.853(6) Å, b = 7.368(11) Å, c = 29.04(4) Å, and β = 93.19(2)°. The structure of 1 shows a 1-D stair-like chain, which is formed by the interconnection of -[Cu2Br2]- step-like units and monodentate anp ligands. Weak hydrogen bonds between amino groups and –NO2 groups from neighboring chains assemble chains to form a supra-layer along the ab plane.Supplemental materials are available for this article. Go to the publisher's online edition of Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry to view the supplemental file.
Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 10/2013; 43(9). DOI:10.1080/15533174.2012.756899 · 0.53 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Pyrene is an alternant polycyclic aromatic hydrocarbon consisting of four fused benzene rings with a large, flat aromatic system, showing high thermal stability, extensive electron delocalization and electron accepted nature. In this work, pyrene was firstly employed as π-conjugated bridge to construct electron donor–π–electron acceptor (D–π–A) organic dyes, where diarylamine or indoline was used as donor, and cyanoacrylic acid as electron acceptor. The peryne-based dyes were employed as sensitizers in dye-sensitized solar cells, and give a short circuit photocurrent density (Jsc) of 12.1 mA/cm2, an open circuit voltage (Voc) of 0.71 V, and a fill factor (FF) of 0.71, corresponding to an overall conversion efficiency (η) of 6.1% under AM 1.5 conditions.
[Show abstract][Hide abstract] ABSTRACT: A novel 1D polymer, [Cd(anp)2Br2]·H2O (1) (anp = 2-amino-5-nitropyridine), was synthesized through the solvothermal reaction of CdBr2·4H2O with anp. The main feature of 1 is a –Br–Cd(anp)2–Br– chain-like structure, which is formed by [anp–Cd–anp] subunits linked via μ2-Br bridges. The 1D chains are further assembled to form a 3D supramolecular architecture through hydrogen bondings. The one-center-A (acceptor)–D (donor) organic building blocks and non-centrosymmetric polar packing arrangement of 1 give rise to a dipole moment along the c-direction, enhancing the hyperpolarizability and thus resulting in a strong second-harmonic generation (SHG) response. The peak of temperature dependence of the dielectric constant of 1 indicates the Curie temperature TC of 138 °C (at 1 kHz). Moreover, complex 1 also exhibits potential ferroelectric properties.
[Show abstract][Hide abstract] ABSTRACT: Two new cobalt(III) complexes, [Co2(L)2(AEN)(N3)] (1) and [Co(L)(PEA)(N3)] (2) (L = 2-[1-(2-hydroxyethylimino) ethyl]phenolate, L = 2-[1-(2-phenylaminoethylimino)ethyl] phenolate, AEN = 2-aminoethanolate, PEA = N-phenylethane-1,2-diamine), have been prepared and characterized by elemental analysis and infrared spectroscopy. The structures of the complexes have been determined by X-ray crystallography. The coordination geometry around cobalt atoms in both complexes is distorted octahedral with one tridentate Schiff base ligand, one bidentate ligand, and one monodentate azide ligand. The antimicrobial activity of the complexes was studied.
Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 01/2012; 42(1):109-114. DOI:10.1080/15533174.2011.609238 · 0.53 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: A new dicyanamido-bridged polymeric copper(II) complex, [Cu(L1)(DCM)] n·nBF4 (1), and a new thiocyanato-coordinated mononuclear zinc(II) complex, [Zn(L2)(NCS]·BF4 (2) (L1 = N-(1-pyridin-2-ylethylidene)propane-1,3-diamine, L2 = N,N′-bis(1-pyridin-2-ylethylidene)propane-1,3-diamine), have been prepared and characterized by elemental analysis and infrared spectroscopy. The structures of the complexes have been determined by X-ray crystallography. The coordination geometry around the Cu atom in (1) and Zn atom in (2) are distorted square pyramid. The antimicrobial activity of the complexes was studied.
Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 01/2012; 42(1):115-120. DOI:10.1080/15533174.2011.609239 · 0.53 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The spectroscopic properties of Dy3+:LiGd(MoO4)2 crystal have been investigated with aim to assess the feasibility of laser operation in the yellow region. On the basis of the analysis of polarized absorption spectra in the framework of the Judd–Ofelt theory, the main spectroscopic characteristics relevant for laser applications have been determined. An intense yellow emission band corresponding to the 4F9/2→6H13/2 transition around 575nm has been observed in the visible region. The emission cross-sections for the 4F9/2→6H13/2 transition have been calculated using the Füchtbauer–Ladenburg formula. The fluorescence and radiative lifetimes of the 4F9/2 manifold are equal to 139.0μs and 199.1μs, respectively, and the quantum efficiency is 69.8%.
[Show abstract][Hide abstract] ABSTRACT: In the title compound, [Co(C(12)H(13)N(2)O(3))(2)], the Co(II) ion is situated on a twofold rotation axis and is coordinated by two N and two O atoms from two symmetry-related Schiff base 2-(cyclo-pentyl-imino-meth-yl)-4-nitro-phenolate ligands (L) in a distorted tetra-hedral geometry. The cyclo-pentyl ring in L is disordered over two conformations in a 0.640 (19):0.360 (19) ratio.
[Show abstract][Hide abstract] ABSTRACT: The reaction of Ag2O and 2-amino-4-methylpyridine (AMP) with 2-aminobenzoic acid (HAC) and nicotinic acid (HNA), respectively, afforded two silver(I) complexes, [Ag(AMP)2] ·AC (1) and [Ag(AMP)(NA)]n·nH2O (2). Both complexes were characterized by elemental analyses and X-ray single-crystal diffraction. Complex (1) is a mononuclear silver(I) complex, in which the Ag atom is in a linear geometry, while complex (2) is a pyridine-3-carboxylate bridged polynuclear silver(I) complex, in which the Ag atom is in a distorted triangular geometry. Both crystals are stabilized by intermolecular hydrogen bonds.
Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 02/2010; Metal-Organic(2-and Nano-Metal Chemistry):129-133. DOI:10.3109/10799890903555608 · 0.53 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: A novel bent-shaped derivative, 2-thiomethyl-4,6-bis(4-N,N-methylaminostyryl) pyrimidine (TMAP) has been successfully synthesised and fully characterised by elemental analysis, IR, H NMR and MS. The molecule possesses D–π–A–π–D structures. Dimethylamino is used as the donor (D), and the pyrimidine ring is used as the acceptor (A). One- and two-photon absorption and fluorescence in various solvents were experimentally investigated. The chromophore shows intense single-photon excited fluorescence (SPEF) and two-photon excited fluorescence (TPEF) in a wide spectral range, with the spectral peak position of the SPEF being basically the same as that of the TPEF. The chromophore combines well with peak TPA cross-sections (up to 352.0 GM) and broad TPA bands throughout the whole 700–900 nm range and high-fluorescence quantum yields could thus be obtained. The theoretical and experimental studies indicate the charge transfer from donor to acceptor.
Physics and Chemistry of Liquids 02/2010; 48(1):99-107. DOI:10.1080/00319100802713333 · 0.78 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The title compound, C(14)H(9)Br(3)N(2)O(2)·CH(4)O, was prepared by the reaction of 3,5-dibromo-2-hydroxy-benzaldehyde and 3-bromo-benzohydrazide in methanol. The asymmetric unit of the crystal consists of a Schiff base mol-ecule and a methanol mol-ecule of crystallization. The dihedral angle between the two benzene rings is 5.5 (2)°. An intra-molecular O-H⋯N hydrogen bond is observed. In the crystal structure, pairs of adjacent Schiff base mol-ecules are linked by two methanol mol-ecules through inter-molecular N-H⋯O and O-H⋯O hydrogen bonds.
[Show abstract][Hide abstract] ABSTRACT: In the title mol-ecule, C(22)H(20)N(2)O, the central aromatic ring forms dihedral angles of 45.30 (2) and 69.43 (2)°, respectively, with the outer pyridine and benzene rings. In the crystal structure, weak inter-molecular C-H⋯O inter-actions link the mol-ecules into layers parallel to the ab plane.
[Show abstract][Hide abstract] ABSTRACT: A pair of isostructural azido- or thiocyanato-bridged centrosymmetric dinuclear copper(II) complexes, [Cu2L2(μ1,3-N3)2] (1) and [Cu2L2(μ1,3-NCS)2] (2), derived from the Schiff base ligand 4-nitro-2-[(2-diethylaminoethylimino)methyl]phenol (HL), have been synthesized and characterized
by elemental analysis, IR spectra and single crystal X-ray diffraction. Each Cu atom in the complexes is five-coordinate in
a square pyramidal geometry by one O and two N atoms of one Schiff base ligand, and by two terminal donor atoms from two bridging
azide or thiocyanate ligands. Both the azide and thiocyanate ligands adopt end-to-end bridging mode in the complexes. The
distance between the two copper atoms is 5.205(2)Å for (1) and 5.515(2)Å for (2). The antimicrobial activity of the complexes has been tested.
Transition Metal Chemistry 07/2008; 33(5):543-546. DOI:10.1007/s11243-008-9077-8 · 1.31 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The asymmetric unit of the title compound, [ZnBr(2)(C(14)H(20)N(2)O)]·H(2)O, consists of a mononuclear Schiff base zinc(II) complex mol-ecule and a solvent water mol-ecule. The Zn(II) atom is four-coordinated in an approximately tetra-hedral geometry, binding to the imine N and phenolate O atoms of the neutral zwitterionic Schiff base ligand and to two terminal Br(-) anions. In the crystal structure, mol-ecules are linked through inter-molecular O-H⋯Br and O-H⋯O hydrogen bonds, forming chains running along the b axis.
[Show abstract][Hide abstract] ABSTRACT: The title compound, [Cu(C16H19N2O)(N3)], was synthesized by the reaction of equimolar quantities of 2-hydroxy-1-naphthaldehyde, N-propylethane-1,2-diamine, sodium azide and copper(II) acetate in a methanol solution. The CuII ion in the compound is four-coordinated by one imine N, one amine N, and one phenolate O atoms of the Schiff base ligand 1-[2-(propylamino)ethyliminomethyl]naphthalen-2-ol and by one terminal N atom of an azide anion, forming a square-planar coordination. The propyl group and attached NH are disordered over two positions; the site occupancy factors are ca 0.6 and 0.4.
[Show abstract][Hide abstract] ABSTRACT: The title compound, [ZnBr2(C12H17ClN2O)], is a mononuclear Schiff base zinc(II) complex. The Zn atom in the compound is four-coordinated by one imine N and one phenolate O atom of the Schiff base ligand and by two terminal Br anions, forming a tetrahedral geometry. In the crystal structure, molecules are linked through intermolecular N—H...O hydrogen bonds, forming chains running along the c axis.
[Show abstract][Hide abstract] ABSTRACT: The title compound, [ZnCl2(C12H16BrClN2O)], is a mononuclear Schiff base complex of zinc(II). The Zn atom binds to the imine N and phenolate O atoms of the chelating Schiff base ligand and to two Cl− anions in a tetrahedral geometry. In the crystal structure, molecules are linked through intermolecular N—H⋯Cl, C—H⋯Br and C—H⋯Cl hydrogen bonds, forming a network.