Crystal structure of hexa-kis-(urea-?O)chromium(III) dichromate bromide monohydrate from synchrotron X-ray data.

ABSTRACT: The title bromide salt, [Cr{CO(NH2)2}6](Cr2O7)Br·H2O, is isotypic to the corresponding chloride salt. Within the complex cation, the Cr(III) atom is coordinated by six O atoms of six urea ligands, displaying a slightly distorted octa-hedral coordination environment. The Cr-O bond lengths involving the urea ligands are in the range 1.9534?(13)-1.9776?(12)?Å. The Cr2O7 (2-) anion has a nearly staggered conformation, with a bridging angle of 130.26?(10)°. The individual components are arranged in rows extending parallel to [100]. The Br(-) anion links the complex cation, as well as the solvent water mol-ecule, through N-H?Br and O-H?Br hydrogen-bonding inter-actions. The supra-molecular architecture also includes N-H?O and O-H?O hydrogen bonding between urea N-H and water O-H donor groups and the O atoms of the Cr2O7 (2-) anion as acceptor atoms, leading to a three-dimensional network structure.

SUBMITTER: Moon D 

PROVIDER: S-EPMC4644995 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature