Abstract
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)A, β = 113.821(3), V = 3010.34(90) A3, 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.
Highlights
Open-framework materials have drawn increasing attention over the past few years because of the wideHow to cite this paper: Tanke, C.E., Ndosiri, B.N., Mbiangué, Y.A., Bebga, G. and Nenwa, J. (2016) Synthesis, Characterization and X-Ray Structure of a Ba(II)/Ag(I)/Cr(III)-Oxalate Salt with Water-Filled Nanochannels
Along the lines of our progressing research program, we recently reported some closely related channel lattice networks with chemical compositions [Ag3−xCr(C2O4)3]x−, where the negative charge (−x) is offset by an equivalent fractional charge from protons [8], monoatomic cations (M+) from group 1 elements [9] [10] or from metal(III) ions [11]
Elemental and full X-ray structure analyses converge to support the formulation of compound 1 as Ba0.5Ag2 [Cr(C2O4)3]∙5H2O
Summary
Open-framework materials have drawn increasing attention over the past few years because of the wideHow to cite this paper: Tanke, C.E., Ndosiri, B.N., Mbiangué, Y.A., Bebga, G. and Nenwa, J. (2016) Synthesis, Characterization and X-Ray Structure of a Ba(II)/Ag(I)/Cr(III)-Oxalate Salt with Water-Filled Nanochannels. Amongst multidentate ligands usually engaged in the construction of this class of materials, the oxalate(2−) dianion ( C2O24− ) occupies an important place, since it is one of the simplest imaginable connectors potentially able to bridge metals ions in the bidentate chelating manner. Transition metal ion complexes provide useful building blocks for stereochemistry control. In this process, the well-documented tris(oxalato)chromate(III) ion, [Cr(C2O4)3]3−, plays a crucial role based on: 1) its remarkable nature as a chiral and paramagnetic building block, 2) its ability to function as a metalloligand (or auxillary ligand) that can mediate electronic effects between paramagnetic centers (e.g. magnetic interactions), and 3) its ability to form interesting long-range hydrogen-bonded solid-state networks
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