Spectroscopic properties and ligand field analysis of cis-diazido(1,4,8,11-tetraazacyclotetradecane)chromium(III) azide.
The emission and excitation spectra of cis-[Cr(cyclam)(N3)2](N3) (cyclam = 1,4,8,11-tetraazacyclotetradecane) taken at 77 K are reported. The infrared and visible spectra at room temperature are also measured. The vibrational intervals due to the electronic ground state are extracted from the far-infrared and emission spectra. The ten electronic bands due to spin-allowed and spin-forbidden transitions are assigned. Using the observed transitions, a ligand field analysis has been performed to determine the bonding property of azido group in the chromium(III) complex. It is found that azide ligand has weak sigma- and pi-donor properties toward chromium(III) ion. The zero-phonon line in the excitation spectrum splits into two components by 249 cm(-1), and the large 2Eg splitting can be reproduced by the ligand field theory.
Choi
J H
JH
Department of Chemistry, Andong National University, South Korea. jhchoi@andong.ac.kr
D000042:Absorption; D001386:Azides / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D008024:Ligands; D013055:Spectrophotometry, Infrared / Q000379:methods
D001386:Azides; D008024:Ligands; D002857:Chromium