Synthesis and structure of luminescent R

This study synthesizes and analyzes luminescent Re I(CO)3Cl complexes that incorporate pyridyltriazine, pyrazinyltriazine, and triazolopyridine as chelating ligands. The primary objective was to investigate their structural and photophysical properties. Methodologically, the complexes were synthesized by reacting Re(CO)5Cl with an excess of each ligand in boiling benzene, leading to the formation of Re(CO)3Cl(L) complexes. Optical absorption and fluorescence spectroscopy were used to determine their luminescent properties in dichloromethane solutions, revealing distinct emission peaks attributed to metal-to-ligand charge transfer (MLCT) states. The recorded quantum yields indicate that the complexes exhibit interesting fluorescent properties, with efficiencies comparable to established references. Electrochemical analysis conducted using cyclic voltammetry unveiled the electroactivity of these complexes, with observable anodic oxidation peaks. X-ray crystallography confirmed the distorted octahedral coordination around Re, with notable spatial arrangements of ligands. This investigation sheds light on the potential applications of these complexes in optoelectronic devices and highlights their unique photophysical characteristics.