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

Abstract

A novel mixed barium(II)/silver(I)/chromium(III) oxalate salt, Ba 0.5 Ag 2 [Cr(C 2 O 4) 3 ]•5H 2 O (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) Å 3 , Z = 8. The structure is characterized by a network of anionic [Cr(C 2 O 4) 3 ] 3− units connected through the O atoms of the oxalates to Ba 2+ 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.