Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Spectroscopic Properties and Ligand Field Analysis of trans -Dibromo(2,2-dimethyl-1,3-diaminopropane)chromium(III) Moiety

  • Choi, Jong-Ha (Department of Chemistry, Andong National University) ;
  • Oh, In-Gyung (Department of Chemistry, Andong National University) ;
  • Lim, Woo-Taik (Department of Chemistry, Andong National University) ;
  • Ryoo, Keon-Sang (Department of Chemistry, Andong National University) ;
  • Kim, Dong-Il (Department of Chemistry, Kyungpook National University) ;
  • Park, Yu-Chul (Department of Chemistry, Kyungpook National University)
  • Published : 2005.06.20
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Abstract

The sharp-line absorption and emission spectra of $(H_{13}O_6)${$trans-[Cr(Me_2tn)_2Br_2]$}$_2Br_2(ClO_4)\;(Me_2$tn = 2,2-dimethyl-1,3-diaminopropane) have been measured between 13000 $cm^{-1}$ and 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 $^2E_g$ splitting can be reproduced by the modern ligand field theory. It is confirmed that nitrogen atoms of the Me2tn ligand have a strong $\sigma$-donor character, but the bromide has weak $\sigma$- and $\pi$-donor properties toward chromium(III) ion.

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