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Co-crystallization of Oxalate Salts of Monoprotonated Amines with a Double Sn-Ph Bond Cleavage
Mouhamadou Birame Diop,
Gorgui Awa Seck,
Modou Sarr,
Libasse Diop,
Allen G. Oliver
Issue:
Volume 6, Issue 2, December 2020
Pages:
16-23
Received:
11 July 2020
Accepted:
27 July 2020
Published:
25 August 2020
Abstract: Two oxalate compounds [(C4H7N2)3][Sb(C2O4)3] (1) and [(Et3NH)][SnPhCl(C2O4)2] (2), have been isolated and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic system, space group P21/c with a=13.3944 (6) Å, b=11.3554 (5) Å, c=16.3314 (7) Å, β=107.206 (1), V=2372.82 (18) Å3 and Z=4. Compound 2 crystallizes in the monoclinic system, space group P21/n with a=8.6903 (4) Å, b=15.3844 (8) Å, c=20.3144 (10) Å, β=100.869 (2), V=2667.2 (2) Å3 and Z=4. The complex-anion [Sb(O2CCO2)3]3- of the compound 1 adopts a distorted pentagonal pyramidal arrangement with monochelating oxalates. The asymmetric unit of 1 consists of three 2-methyl-1H-imidazolium cations, C4H7N2+, three oxalate anions, C2O42-, and one antimony (III) ion, Sb3+. From a supramolecular point of view, in 1 complex-anions are connected by cations through N-H•••(O,O) and N-H•••O hydrogen bonds involving the two oxalates of the basal plane into sheets which are then connected via the remaining oxalate and cations through N-H•••O hydrogen bonds to give rise to a three-dimensional structure. The complex-anion of 2 is comprised of a tin centre linked to a chlorine atom and a phenyl group, and cis-chelated by two oxalates in a distorted octahedral fashion. Each triethylammonium cation is connected to the complex-anion through bifurcated N-H•••(O,O) hydrogen bonds. These interactions lead to a discrete structure. A double Sn-C bond cleavage has occurred during the process of the formation of the compound 2. In both complounds 1 and 2, one cation exhibits some positional disorder.
Abstract: Two oxalate compounds [(C4H7N2)3][Sb(C2O4)3] (1) and [(Et3NH)][SnPhCl(C2O4)2] (2), have been isolated and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic system, space group P21/c with a=13.3944 (6) Å, b=11.3554 (5) Å, c=16.3314 (7) Å, β=107.206 (1), V=2372.82 (18) Å3 and Z=4. Compound 2 crystallizes in ...
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Synthesis and ESR Spectroscopy Complexes of Copper(II) with Acyl- and Aroylhydrazones of Methyl Ester of 5,5-Dimethyl-2,4-Dioxohexanoic Acid
Tursunov Murod Amonovich,
Sevinchova Dilobar Nematovna,
Avezov Kuvondik Giyasovich,
Umarov Bako Bafayevich,
Ganiyev Bakhtiyor Shukurullayevich,
Savriyeva Nigina Qahramon Qizi
Issue:
Volume 6, Issue 2, December 2020
Pages:
24-29
Received:
24 July 2020
Accepted:
19 August 2020
Published:
3 September 2020
Abstract: The method of ESR is widely used for the investigation of electronic construction and the geometrical structure of the polynuclear complexes of the transition metals. The majority of the well-known experimental works had been done using monocrystals and polycrystalline examples. Construction of mononuclear complexes of the copper(II), the nature of antiferromagnetic exchange interaction, and its value was the object of the discussion by the scientists and that issue is being checked in the article. Complex compounds of copper(II) with 5,5-dimethyl-2,4-dioxohexane acid ((H2L1–H2L11) methyl ether aroylhydrazones were synthesized and studied. The interaction of alcohol solutions of the H2L1–H2L11 ligands with an aqueous ammonia solution of copper(II) acetate synthesized green fine-crystalline copper(II) complexes. Complexes investigation by the method of ESR spectroscopy, of the studying the magneto chemical properties of copper(II) complexes. If for the complex compound CuL1 • NH3, which has a cyclopentanone ring β-diketone fragment, the EPR parameters have theβa substituent for the α2=0.82; value: g=2.099, aCu=89.53 e, aN=12.81 e, then for CuL4 • NH3 with a cyclohexane ring substituent these values are in the range: g=2,101, aCu=87,48 e, aN=13,02 e, α2=0,82.
Abstract: The method of ESR is widely used for the investigation of electronic construction and the geometrical structure of the polynuclear complexes of the transition metals. The majority of the well-known experimental works had been done using monocrystals and polycrystalline examples. Construction of mononuclear complexes of the copper(II), the nature of...
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Synthesis, Spectroscopic Studies and Crystal Structures of N, N’-bis (4-methoxybenzylidene) Ethylenediamine and an Its New Cadmium (II) Complex
Adrienne Ndiolene,
Tidiane Diop,
Mouhamadou Sembene Boye,
Thierry Maris,
Aminata Diasse-Sarr
Issue:
Volume 6, Issue 2, December 2020
Pages:
30-35
Received:
1 November 2020
Accepted:
12 November 2020
Published:
19 November 2020
Abstract: Schiff base (L) ligand is prepared via condensation of P-Anisaldehyde and ethylene diamine in 2:1 ratio in ethanol. A new complex is prepared by reacting this ligand with metallic salt CdI2. The structure of the two derivatives are confirmed using various spectroscopic techniques: C, H, N analyses, IR, UV-visible and X-ray diffraction. The IR spectrums of ligand and complex show respectively intense peaks at 1629 cm-1 and 1639cm-1 indicating the presence of azomethine group (N=C). The crystal structure of the ligand belongs respectively to monoclinic, space group P21/n. In the crystal packing of the ligand, molecules are linked by a pair of methyl-C-H…O(methoxy) interactions, forming to an infinite one-dimensional chain. The structural characterization of the complex reveals that it crystallizes in an orthorhombic system P with as space group Pbca with a=14.8704 Å; b=12.9618 Å; c=22.4416 Å. The crystal structure of the monomer complex shows a distorted tetrahedral geometry. The CdII center is coordinated by the bidentate schiff base ligand via the two imine groups (N-donor) and the two chlorine atoms. Non-classical intermolecular H-bonds of the type benzene-C—H…O(methoxy) exist and link the monomeric complex, forming one dimensional chains.
Abstract: Schiff base (L) ligand is prepared via condensation of P-Anisaldehyde and ethylene diamine in 2:1 ratio in ethanol. A new complex is prepared by reacting this ligand with metallic salt CdI2. The structure of the two derivatives are confirmed using various spectroscopic techniques: C, H, N analyses, IR, UV-visible and X-ray diffraction. The IR spect...
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