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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 24, Number 3
BKCSDE 24(3)
March 20, 2003 

 
Title
Electronic and Vibrational Spectroscopy of cis-Diisothiocyanato(1,4,8,11- tetraazacyclotetradecane)chromium(III) Thiocyanate
Author
Jong-Ha Choi, Yu Chul Park
Keywords
Electronic transitions, Vibrational intervals, Chromium(III) complex, Ligand field analysis
Abstract
The emission and excitation spectra of cis-[Cr(cyclam)(NCS)2]NCS (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 pure electronic origins due to spin-allowed and spin-forbidden transitions are assigned by analyzing the absorption and excitation spectra. Using the observed transitions, a ligand field analysis has been performed to determine the bonding properties of the coordinated ligands in the title chromium(III) complex. According to the results, it is found that nitrogen atoms of the cyclam ligand have a strong s-donor character, while the NCS ligand has medium s- and p-donor properties toward chromium(III) ion.
Page
384 - 388
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