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Synthesis, Characterization and X-Ray Structure of a Ba(II)/Ag(I)/Cr(III)-Oxalate Salt with Water-Filled Nanochannels

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American Journal of Analytical Chemistry 2016年第1期7卷 99-106页

作者： clémence eboga tanke Bridget N. Ndosiri Yves A. Mbiangué Gouet Bebga Justin Nenwa Inorganic Chemistry Department Faculty of Science University of Yaounde 1 Yaounde Cameroon Chemistry Department Higher Teacher Training College University of Maroua Maroua Cameroon Chemistry Department Higher Teacher Training College University of Yaounde 1 Yaounde Cameroon

A novel mixed barium(II)/silver(I)/chromium(III) oxalate salt, Ba0.5Ag2[Cr(C2O4)3]·5H2O (1), with open architecture has been synthesized in water and characterized by elemental analysis, vibrational and electronic spectra, and single crystal X-ray structure determination. Compound 1 crystallizes in a monoclinic space group C2/c, with unit cell parameters a = 18.179(3), b = 14.743(2), c = 12.278(2)Å, β = 113.821(3), V = 3010.34(90) Å3, Z = 8. The structure is characterized by a network of anionic [Cr(C2O4)3]3- units connected through the O atoms of the oxalates to Ba2+ and Ag+ sites, forming a three-dimensional coordination polymer with one-dimensional isolated nanochannels parallel to the c axis, and encapsulating hydrogen-bonded guest water molecules. The bulk structure is consolidated by O–H···O bridgings within the nanochannels and by coulombic interactions.

关键词： Crystal Structure Chromium(III) Complex Nanochannels Coordination Polymer Guest-Water Molecules

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Anionic Nanochanneled Silver-Deficient Oxalatochromate(III) Complex with Hydroxonium as Counter Ion: Synthesis, Characterization and Crystal Structure

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Open Journal of Inorganic Chemistry 2017年第3期7卷 75-87页

作者： clémence T. eboga Gouet Bebga Yves A. Mbiangué Emmanuel N. Nfor Patrick L. Djonwouo Michel M. Bélombé Justin Nenwa Inorganic Chemistry Department University of Yaounde Yaounde Cameroon Chemistry Department Higher Teacher Training College University of Yaounde 1 Yaounde Cameroon Chemistry Department Higher Teacher Training College University of Maroua Maroua Cameroon Department of Chemistry University of Buea Buea Cameroon

Reaction of Ba0.50[Ag2Cr(C2O4)3]·5H2O with Ag2SO4 in an aqueous solution of sulfuric acid (pH ≈ 3) yielded the silver(I)/chromium(III) oxalate salt H0.50[Ag2.50Cr(C2O4)3]·5H2O (1). Compound 1 can be best described as an anionic silver-deficient oxalatochromate(III) complex [Ag2.50Cr(C2O4)3]0.5- with nanochannels containing hydrogen-bonded water molecules and protons. Thermal analyses show significant weight losses corresponding to the elimination of water molecules of crystallization followed by the decomposition of the network.

关键词： Silver-Deficient Oxalatochromate(III) Water-Filled Nanochannels Protons Thermal Analysis Crystal Structure

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