SYNTHESIS AND CHARACTERIZATION OF RHENIUM(I) COMPLEXES BOUND TO THE BRIDGING LIGAND 2,3-BIS(2-PYRIDYL)PYRAZINE

Our research group has been interested in the design and characterization of mono- and bimetallic low-spin d6transitionmetal complexes bound through nitrogen aromatic heterocyclic ligands such as 2,3-bis(2-pyridyl)pyrazine (dpp) and 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz), for potential use in photon-capture/excited-state energy-transfer processes.1Several studies have recently demonstrated that rhenium carbonyl centers bound with 2,2'-bipyrimidine (bpm) and other pyridyl ligands have highly abosrbing MLCT bands in the visible spectrum and are emissive and electrochemically stable, making them ideal fragments in photon-capture energy-transfer processes.2-7Thus, a relatively few [Re(CO)3Cl]L complexes with absorption and electrochemical characteristics similar to those of the well-studied Ru(II) family have been prepared and studied with possible application in light-induced electron-transfer reactions. We wish to contribute to this field the preparation and UV-visible, electrochemical, emission, solvatochromic, and infrared characterization of the newly prepared [Re(CO)3CI]dpp and [Re(CO)3Cl]2dpp complexes. © 1990, American Chemical Society. All rights reserved.