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Crystal Structure and Spectroscopic Properties of trans-Dibromobis(1,2-ethanediamine)chromium(III) Perchlorate

Lookup NU author(s): Emeritus Professor Bill Clegg, Dr Ross Harrington

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Abstract

The crystal structure of trans-[Cr(en)(2)Br-2]ClO4 (en = 1,2-ethanediamine) has been determined by a single-crystal X-ray diffraction study at 150 K. The complex crystallizes in the space group P (1) over bar of the triclinic system with two mononuclear formula units in a cell of dimensions a = 6.853(4), b = 8.109(5), c = 12.475(8) angstrom, alpha = 81.006(10)degrees, beta = 77.005(10)degrees and gamma = 74.981(10)degrees. The Cr atom is in a slightly distorted octahedral environment, coordinated by four nitrogen atoms of two en ligands and two bromine atoms in trans axial positions. The mean Cr-N(en) and Cr-Br bond lengths are 2.079(3) and 2.4743(10)angstrom, respectively. The five-membered rings are in stable gauche conformations with N1-Cr1-N2 and N3-Cr2-N4 angles of 82.81(11)degrees and 83.67(11)degrees, respectively. The crystal packing is stabilized by a network of N-H center dot center dot center dot O and N-H center dot center dot center dot Br hydrogen bonds. The infrared and electronic absorption spectra are consistent with the results of X-ray crystallography.


Publication metadata

Author(s): Choi JH, Clegg W, Harrington RW, Lee SH

Publication type: Article

Publication status: Published

Journal: Journal of Chemical Crystallography

Year: 2010

Volume: 40

Issue: 7

Pages: 567-571

Print publication date: 16/02/2010

ISSN (print): 1074-1542

ISSN (electronic): 1572-8854

Publisher: Springer New York LLC

URL: http://dx.doi.org/10.1007/s10870-010-9698-6

DOI: 10.1007/s10870-010-9698-6


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