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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 6
BKCSDE 26(6)
June 20, 2005 

Spectroscopic Properties and Ligand Field Analysis of trans-Dibromo(2,2-dimethyl-1,3-diaminopropane)chromium(III) Moiety
Jong-Ha Choi*, In-Gyung Oh, Woo-Taik Lim, Keon Sang Ryoo, Dong Il Kim, Yu Chul Park
Electronic transitions, Dibromochromium(III), Bidentate Me2tn, AOM parameter
The sharp-line absorption and emission spectra of (H13O6){trans-[Cr(Me2tn)2Br2]}2Br2(ClO4) (Me2tn = 2,2-dimethyl-1,3-diaminopropane) have been measured between 13000 cm-1and 16000 cm-1 at 5 K. The 298 K infrared and visible absorption spectra have also been measured. The nine electronic bands due to spin-allowed and spin-forbidden transitions were assigned. Using observed transitions, a ligand field analysis has been performed to probe the ligand field properties of coordinated atoms in the title chromium(III) complex ion. The zero-phonon line in the sharp-line absorption spectrum splits into two components by 286 cm-1, and the large 2Eg splitting can be reproduced by the modern ligand field theory. It is confirmed that nitrogen atoms of the Me2tn ligand have a strong σ-donor character, but the bromide has weak σ- and π-donor properties toward chromium(III) ion.
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