Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Spectroscopic Properties and Ligand Field Analysis of cis-Dinitrato(1,4,8,11-tetraazacyclotetradecane)chromium(III) Nitrate

  • Published : 1997.08.20
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Abstract

The luminescence and photoexcitation spectra of cis-[Cr(cyclam)(NO3)2]NO3·½ 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(Ⅲ) complex. According to the results, it is found that nitrate ligand has weak σ- and π-donor properties toward chromium(Ⅲ).

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