Rhenium(I) carbonyl complex of 4,7-diphenyl-1,10-phenanthroline–Spectroscopic properties, X-Ray structure, theoretical studies of ground and excited electronic states

The paper presents structural studies of the tricarbonyl complexes incorporating 4,7-diphenyl-1,10-phenanthroline (dpphen) - [Re(CO)3(dpphen)Cl]2·Me2CO (1) and [Re(CO)3(dpphen)Cl] (2). The absorption and emission spectra of [Re(CO)3(dpphen)Cl] were discussed with the aid of DFT and time-dependent TD-DFT theories. The theoretical studies reveal mixing between the singlet (S1) and triplet (T1) excited states of MLCT character.