Abstract
Formation of coordination complexes of DMABA and DMAP with MnHal2 (Hal = Cl, Br, I) in ethanol is accompanied by a bathochromic shift of the absorption spectra and quenching of the LE and CT fluorescence bands. Complexation of DMABA with MnHal2 (Hal = F, Cl, Br) in acetonitrile results in enhancement of the LE fluorescence band with no changes in the CT band. The fluorescence rise at the LE band is explained by the blocking of internal conversion in the rigid complex molecule. The complex formation constants have been calculated, and probable structures of the complexes are presented.
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