title: Synthesis and properties of the diruthenium(II) complexes with diimine-linked polypyridine bridges.
abstract: The diruthenium complexes, [(bpy)2Ru(II)-(bpy-DPDA)-Ru(II)(bpy)2][PF6]4 3, (bpy: 2,2'-bipyridiyl; bpy-DPDA: Bis(2,2'-dipyridylketenylidene)-N,N-1,4-phenylenediamine}, and [(bpy)2Ru(II)-(Dbpy-DPDA)-Ru(II)(bpy)2][PF6]4 4 {Dbpy-DPDA: Bis(2,2'-dipyridyl ketenylidene)-N,N-1,1'-(4,4'-diphenylene)diamine}, were prepared by the reaction of (bpy)2Ru(II)Cl2 with diimine-linked polypyridine bridges. These complexes were characterized by NMR, IR, UV/VIS, PL and cyclic voltammetry. In the 13C-NMR spectra of 3 and 4, the carbon peaks of the Schiff Bases (>C=N-) were shifted to lower fields, and emissions were observed at 689 and 693 nm with quantum yields of 0.004 and 0.006, respectively. The electrochemistry of complexes 3 and 4 showed four-reversible waves (one oxidation wave and three reduction waves). The electrochemically measured band gaps for complexes 3 and 4 were 2.01 and 2.10 eV, respectively.
authors.affiliation: Department of Chemistry Engineering, Sunchon National University, Sunchon, Jeonnam 540-742, Korea.
authors.forename: Dong Hwan
authors.initials: DH
authors.lastname: Kim
authors.forename: Hwa-Seon
authors.initials: HS
authors.lastname: Kim
authors.forename: Woong Kyu
authors.initials: WK
authors.lastname: Jo
authors.forename: Ho-Geun
authors.initials: HG
authors.lastname: Ahn
authors.forename: Chee Hun
authors.initials: CH
authors.lastname: Kwak
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Lee
authors.forename: Dong Ho
authors.initials: DH
authors.lastname: Kim
authors.forename: Ruimao
authors.initials: R
authors.lastname: Hua
authors.forename: Min Chung
authors.initials: MC
authors.lastname: Chung