Abstract
AbstractThe luminescence spectra of cis‐Cr(IDA)−2 and trans‐Cr(MIDA)−2 complexes with various cations have been examined (H2IDA = iminodiacetic acid; H2MIDA = methyliminodiacetic acid), and compared with intercombination band reflectance spectra and infrared spectra. The two isomers show completely different Iuminescence behavior, the trans complex exhibiting only phosphorescence, and the cis complex exhibiting both fluorescence and phosphorescence. Moreover, two different Iuminescence spectra are produced by the cis complex, depending on temperature and the medium. This phenomenon is interpreted through involvement of the 2T1g excited state. The structure in the phosphorescence spectrum of the trans complex is interpreted in terms of vibrational coupling, and the concept of a “pseudo‐Stokes shift” is introduced.
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