Synthesis and Luminescent Properties of the Carbonyl-Isonitrile Re(I) Complex Based on Menthol-Modified Phenanthroline

A carbonyl-isonitrile complex of [Re(CO)₃(L)(m-XylylNC)]OTf formulation (-XylylNC - 2,6-dimethyl- phenyl isocyanide) was synthesized based on the 1,10-phenanthroline ligand (L) containing a menthol fragment (MtO-) in position 2. The Re(I) atom in the cationic part of this complex has a distorted octahedral environment formed by the N,N′-chelate ligand L, one isonitrile ligand, and three CO ligands. The resulting compound exhibits bright green phosphorescence at room temperature in both the solid state and solution, with quantum yields of 15% and 10%, respectively.