Spectroscopic Properties and Ligand Field Analysis of cis-Dinitrato(1,4,8,11-tetraazacyclotetradecane)chromium(￥2) Nitrate

摘要

The luminescence and photoexcitation spectra of cis-[Cr(cyclam)(NO3)2]NO3· H2O (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 of 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. With observed transitions, a ligand field analysis has been performed to determine the bonding property of nitrate group in the chromium(ゲ) complex. According to the results, it is found that nitrate ligand has weak ヲ- and ヰ -donor properties toward chromium(ゲ).