Journal of Photoscience

Korean Society of Photoscience (한국광과학회)
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Electronic Spectroscopy and Ligand Field Analysis of cis-$>[Cr(cycb)Cl_2]$Cl

  • Choi, Jong-Ha (Department of Chemistry, Andong National University) ;
  • Oh, In-Gyung (Department of Chemistry, Andong National University) ;
  • Subodh Kumar (Department of Chemistry, Andong National University) ;
  • Ryoo, Keon-Sang (Department of Chemistry, Andong National University)
  • Published : 2004.04.01
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Abstract

The sharp-line absorption spectrum of microcrystalline samples of cis-[Cr(cycb)$Cl_2$]Cl (cycb=rac-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) has been measured between 13000 and $16000 cm^{-1}$ at temperatures down to 5K. The 77K emission and excitation spectra, and 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 the observed transitions, a ligand field analysis has been performed to probe the ligand field properties of coordinated atoms in the title chromium(III) complex. The zero-phonon line in the sharp-line absorption spectrum splits into two components by $240 cm^{-1}$ , and the $large ^2$$_E{g}$ splitting can be reproduced by the modem ligand field theory. It is confirmed that nitrogen atoms of the macrocyclic cycb ligand have a strong $\sigma$-donor character, but chloride ligand has weak $\sigma$- nd $\pi$-donor properties toward chromium(III) ion.n.

Keywords

References

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