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

Bulletin of the Korean chemical society

Woo-Taik Lim¹  In-Gyung Oh¹  Keon Sang Ryoo¹  Yu Chul Park¹  Dong Il Kim¹  Jong-Ha Choi¹ 

关键词: Electronic transitions;    Dibromochromium(III);    Bidentate Me2tn;    AOM parameter;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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 �?-donor character, but the bromide has weak �?- and �?-donor properties toward chromium(III) ion.

【 授权许可】

Unknown