Crystal Structure and Spectroscopic Properties of <Emphasis Type="Italic">trans</Emphasis>-Dibromobis(1,2-ethanediamine)chromium(III) Perchlorate |
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Authors: | Jong-Ha Choi William Clegg Ross W Harrington Sang Hak Lee |
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Institution: | (1) Department of Chemistry, Andong National University, Andong, 760-749, Korea;(2) School of Chemistry, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK;(3) Department of Chemistry, Kyungpook National University, Daegu, 702-701, Korea |
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Abstract: | Abstract The crystal structure of trans-Cr(en)2Br2]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] P\overline{1} 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) ?, α = 81.006(10)°, β = 77.005(10)° and γ = 74.981(10)°. 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)?, respectively. The five-membered rings
are in stable gauche conformations with N1–Cr1–N2 and N3–Cr2–N4 angles of 82.81(11)° and 83.67(11)°, respectively. The crystal packing is stabilized
by a network of N–H···O and N–H···Br hydrogen bonds. The infrared and electronic absorption spectra are consistent with the
results of X-ray crystallography. |
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