Structural and Photophysical Trends in Rhenium(I) Carbonyl Complexes with 2,2′:6′,2″-Terpyridines.

This is the first comprehensive review of rhenium(I) carbonyl complexes with 2,2′:6′,2″-terpyridine-based ligands (R-terpy)—encompassing their synthesis, molecular features, photophysical behavior, and potential applications. Particular attention has been devoted to demonstrating how the coordination mode of 2,2′:6′,2″-terpyridine (terpy-κ²N and terpy-κ³N), structural modifications of terpy framework (R), and the nature of ancillary ligands (X—mono-negative anion, L—neutral ligand) may tune the photophysical behavior of Re(I) complexes [Re(X/L)(CO)₃(R-terpy-κ²N)]^0/+ and [Re(X/L)(CO)₂(R-terpy-κ³N)]^0/+. Our discussion also includes homo- and heteronuclear multicomponent systems with {Re(CO)₃(R-terpy-κ²N)} and {Re(CO)₂(R-terpy-κ³N)} motifs. The presented structure–property relationships are of high importance for controlling the photoinduced processes in these systems and making further progress in the development of more efficient Re-based luminophores, photosensitizers, and photocatalysts for modern technologies. [ABSTRACT FROM AUTHOR]