Synthesis and Characterization of Polypiridine-Based Rhenium(I) Complexes with Pyrazino[2,3-f][1,10]phenanthroline

✍ Scribed by Ramiro Díaz; Angélica Francois; Ana María Leiva; Bárbara Loeb; Ester Norambuena; Mauricio Yañez

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: German
• Weight: 122 KB
• Volume: 89
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.200690119

✦ Synopsis

Abstract

A series of tricarbonyl rhenium(I) complexes of the type fac‐[Re^I^(CO)~3~(ppl)(L)]^0/+^, where ppl is pyrazino[2,3‐f][1,10]phenanthroline, and where L is Cl^−^, TfO^−^, 4‐(tert‐butyl)pyridine (^t^Bu‐py), 4‐methoxypyridine (MeO‐py), 4,4′‐bipyridyl (bpy), or 10‐(picolin‐4‐yl)phenothiazine (pptz), were synthesized and fully characterized. In all complexes, an increment in the electron‐acceptor properties of ppl compared to the free ligand was observed. This effect was more significant for pyridine‐type ligands, especially for pptz, compared to Cl^−^ or TfO^−^. The properties of fac‐[Re(CO)~3~(ppl)(pptz)]PF~6~ were compared with those of the analogous compound fac‐[Re(CO)~3~(dppz)(pptz)]PF~6~, where dppz is dipyrido(3,2‐a : 2′,3′‐c)phenazine, the goal being to generate long‐lived excited charge‐transfer (CT) states. In this respect, fac‐[Re(CO)~3~(ppl)(pptz)]PF~6~ seems to be a promising candidate.