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Syntheses and Characterization of Two Novel Copper(II) Malonate Complexes Functionalized with 3,3’-Bis(pyrazolyl)pentane and 4,4’-Trimethylenedipyridine

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Open Journal of Inorganic Chemistry 2021年第2期11卷 43-53页

作者： alvine loris djoumbissie Alain Clovis Tayo Djampouo Tanyi Rogers Fomuta Giscard Doungmo Golngar Djimassingar Alain Charly Tagne Kuate Jean Ngoune Department of Chemistry University of Dschang Dschang Cameroon Institute of Inorganic Chemistry Christian-Albrechts University of Kiel Kiel Germany Department of Chemistry Mongo Polytechnique University Institute (IUPM) Mongo Chad

Two novel copper complexes (1,2) with N,O-donor ligands were synthesized by reaction of copper(II) malonates with 3,3’-bis(pyrazolyl)pentane and 4,4’-trimethylenedipyridine in methanol at moderate temperature. These compounds were characterized by elemental analysis, UV-VIS, IR spectroscopies and powder X-ray diffraction analyses. Compound (1) melts at higher temperature (202°C) than compound (2) (100°C). The IR spectra showed typical vibrations related to C=N and C=C, characteristic of pyrazolyl and pyridine ligands.

关键词： Copper Malonate 3 3’-Bis(pyrazolyl)pentane 4 4’-Trimethylenedipyridine UV-Vis IR Powder X-Ray Diffraction

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Synthesis, Characterization and DFT Studies of Two Zinc(II) Complexes Based on 2-Isopropylimidazole

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Open Journal of Inorganic Chemistry 2018年第4期8卷 105-124页

作者： Jean Jacques Anguile Odette Nana Ngnabeuye Ndosiri Ndoye Bridget Tanyi Rogers Fomuta alvine loris djoumbissie Alain Charly Kuate Tagne Jean Ngoune Department of Chemistry University of Sciences & Techniques of Masuku Franceville Gabon Department of Chemistry University of Dschang Dschang Cameroon Department of Inorganic Chemistry University of Yaounde 1 Yaounde Cameroon

Two novel coordination compounds, [Zn(L)2(OOCH)2] (1) and [Zn(L)3(OCHO)](OCHO)]·H2O (2) (where L = 2-isopropylimidazole, C6H10N2) have been prepared by reaction of 2-isopropylimidazole with zinc(II) formate at room temperature using toluene as solvent. These compounds were characterized by elemental and thermal analyses, IR, 1HNMR and 13CNMR spectroscopies, single crystal X-ray diffraction and DFT studies. The Zn centers in 1 and 2 adopt pseudo-tetrahedral coordination geometries. Compound 1 crystallizes in the monoclinic system P2/c space group whereas compound 2 crystallizes in the P-1 space group of the triclinic crystal system. Several types of hydrogen intra-/intermolecular interactions are observed in these materials and extend into a two-dimensional leaf like network in 1 and a two-dimensional lattice of rectilinear pillars in 2. Compounds 1 and 2 were also optimized and their frontier molecular orbitals, global reactivity descriptors, molecular electrostatic potential, natural bond orbitals were investigated using density functional theory (DFT). In fact the induced structural differences from complex 1 to complex 2 led to the reduction of the frontier molecular orbital energy gap by 1.338 eV and a decrease of the chemical hardness by 0.669 eV.

关键词： Zinc(II) Complexes of 2-Isopropylimidazole Thermogravimetric Analysis 1H-MR 13C-MR Crystal Structure DFT Studies

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Synthesis and Structural Characterization of a New Two-Dimensional Polymeric Hybrid Material {[Cu3(μ3-1,2,3-BTC)(μ2-1,2,3-BTC)(en)3(OH2)2(OH)(μ2-OH2)]2·5H2O·O}n

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Open Journal of Inorganic Chemistry 2020年第4期10卷 52-62页

作者： alvine L. djoumbissie Francis W. Njifack Alain T. Djampouo Tanyi R. Fomuta Golngar Djimassingar Alain C. Tagne Kuate Jean Ngoune Department of Chemistry Faculty of Science University of Dschang Dschang Cameroon Department of Chemistry Mongo Polytechnique University Institute (IUPM) Mongo Chad

The reaction of benzene-1,2,3-tricarboxylate copper(II) trihydrate (Cu3(1,2,3-BTC)2·3H2O) and ethylenediamine (en) gave after recrystallization from methanol at room temperature violet crystalline solid of the polymeric two dimensional material {[Cu3(μ3-1,2,3-BTC)(μ2-1,2,3-BTC)(en)3(OH2)2(OH)(μ2-OH2)]2·5H2O·O}n (1) as identified by single crystal X-ray diffraction analysis. The compound was also characterized by elemental analysis, FT-IR spectroscopy, UV-vis spectroscopy, thermogravimetric analysis (TGA) and magnetic susceptibility. The molecular structure indicates crystallization in the triclinic space group P-1 with the unit cell parameters a = 12.1205(3) Å, b = 12.7026(3) Å, c = 13.9890(3) Å, α = 75.034(1)°, β = 74.957(1)°, γ = 68.415(1)°. Structural analysis also revealed that the dimeric compound is connected by Cu-O-Cu bridges and the dimer is further converted into a polymeric chain structure through bridging of one benzene-1,2,3-tricarboxylate ligand. Different coordination modes are observed at the copper atom. The Cu atom at the center is octahedral while the two other ones are pentacoordinated. Thermal analysis of the compound showe

关键词： Copper Ethylenediamine Benzene-1 2 3-Tricarboxylate Coordination Polymer Magnetism

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