CRYSTAL AND MOLECULAR-STRUCTURE OF RUBIDIUM BIS(PYRIDINE-2,6-DICARBOXYLATO)-CHROMATE(III)

A three dimensional X-ray structural analysis of rubidium bis (pyridine-2,6-dicarboxylato)chromate(III), Rb[Cr(dipic)2], has been carried out. The structure was refined by full matrix least-squares methods, using 713 observed independent reflections recorded at room temperature, to a conventional weighted R of 0.034. The crystals are tetragonal with a = b = 6.950(3) Å, c = 29.47(1) Å, space group 14 1/a and Z = 4. The point group symmetry of the [Cr(dipic)2]-ion is S4. The Cr-N and Cr-O distances (1.974(4) and 2.000(3) Å respectively) noticeably differ from the usual values in aminoacid chromium(III) complexes. The π bonding effect of the pyridine nitrogen atom corroborates the previous spectral studies on the sodium salt of this complex. The lability of [Cr(dipic)2]- in acid solution has been tentatively explained on the basis of the relatively severe strain within the complex ion. © 1979, Taylor & Francis Group, LLC. All rights reserved.