Spectroscopic and electrochemical properties of Pt(II) complexes with aromatic terdendate (C^N^C) cyclometallating ligands

✍ Scribed by Mauro Maestri; Christine Deuschel-Cornioley; Alex von Zelewsky

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 495 KB
• Volume: 67
• Category: Article
• ISSN: 1010-6030
• DOI: 10.1016/1010-6030(92)85226-k

✦ Synopsis

Absorption spectra, emission spectra, emission lifetime and electrochemical behavior of the complexes c-Pt(Hdpbhq)2, t-Pt(dpbhq)S(Et),, t-Pt(dpbhq)py, and t-Pt(dpbhq)pyr (where dpbhq'-is the C-deprotonated form of 5,6-dihydro-2,4-diphenylbenzo(h)quinoline (H,dpbhq) and py and pyr are pyridine and pyrazine) have been studied. The structured luminescence spectra observed at 77 K have been assigned to transitions having: (i) metalto-ligand charge transfer (MLCT) character in the case of Pt(H-dpbhq), and mainly MLCT character with some ligand-centered (LC) contribution for the three terdentate tran,s Pt(II) complexes. The luminescence emission in all cases involves the dpbhq ligand even though the electrochemical results suggest a lowest unoccupied molecular orbital (LUMO) centered on the pyrazine ligand in the Pt(dpbhq)pyr complex.