Toggle Main Menu Toggle Search

Open Access padlockePrints

Structural and spectroscopic properties of trans-dichlorobis(2,2-dimethyl-1,3-diaminopropane)chromium(III) chloride

Lookup NU author(s): Professor William Clegg, Gary Nichol, Professor Mohammad Habibi

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Abstract

The structure of trans-[CrCl2(Me2tn)2]Cl (Me2tn = 2,2-dimethylpropane-1,3-diamine) has been determined by a single-crystal X-ray diffraction study at 150 K. The analysis reveals that there are two independent Cr(III) complex cations in the structure, one with crystallographic inversion symmetry and the other with two-fold rotation symmetry, which are conformational isomers of each other. In both conformations, the chromium atom adopts a distorted octahedral structure with the four nitrogen atoms of two Me2tn ligands occuping the equatorial plane and two chlorine atoms occuping trans-axial positions. The six-membered chelate rings are in stable chair conformations with N-Cr-N angles of 87.03(8)° and 88.99(8)°. The two chelate rings in the centrosymmetric complex cation 1 are anti, while those in the rotation-symmetric complex cation 2 are in syn conformations. The mean Cr-N and Cr-Cl bond lengths are 2.0922 and 2.3253 Å, respectively. The infrared and UV-visible absorption spectra of trans-[CrCl2(Me2tn)2]Cl have also been measured. The resolved band maxima of the electronic d-d spectrum are fitted with a secular determinant for a quartet energy state of the d3 configuration in a tetragonal field including configurational but neglecting spin-orbit coupling. It is confirmed that the nitrogen atoms of the Me2tn ligand have a strong σ-donor character, but the chloro ligand has weak σ- and π-donor properties toward the chromium(III) ion. © 2007 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Choi J-H, Clegg W, Nichol GS, Lee SH, Park YC, Habibi MH

Publication type: Article

Publication status: Published

Journal: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

Year: 2007

Volume: 68

Issue: 3

Pages: 796-801

ISSN (print): 1386-1425

ISSN (electronic): 1873-3557

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.saa.2007.01.002

DOI: 10.1016/j.saa.2007.01.002

PubMed id: 17307384


Altmetrics

Altmetrics provided by Altmetric


Share