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2,3-Di(2-pyridyl)-5-phenylpyrazine: A NN-CNN-Type Bridging Ligand for Dinuclear Transition-Metal Complexes.
- Source :
-
Chemistry - An Asian Journal . Jul2013, Vol. 8 Issue 7, p1504-1513. 10p. - Publication Year :
- 2013
-
Abstract
- A new bridging ligand, 2,3-di(2-pyridyl)-5-phenylpyrazine (dpppzH), has been synthesized. This ligand was designed so that it could bind two metals through a NN-CNN-type coordination mode. The reaction of dpppzH with cis-[(bpy)2RuCl2] (bpy=2,2′-bipyridine) affords monoruthenium complex [(bpy)2Ru(dpppzH)]2+ ( 12+) in 64 % yield, in which dpppzH behaves as a NN bidentate ligand. The asymmetric biruthenium complex [(bpy)2Ru(dpppz)Ru(Mebip)]3+ ( 23+) was prepared from complex 12+ and [(Mebip)RuCl3] (Mebip=bis( N-methylbenzimidazolyl)pyridine), in which one hydrogen atom on the phenyl ring of dpppzH is lost and the bridging ligand binds to the second ruthenium atom in a CNN tridentate fashion. In addition, the RuPt heterobimetallic complex [(bpy)2Ru(dpppz)Pt(CCPh)]2+ ( 42+) has been prepared from complex 12+, in which the bridging ligand binds to the platinum atom through a CNN binding mode. The electronic properties of these complexes have been probed by using electrochemical and spectroscopic techniques and studied by theoretical calculations. Complex 12+ is emissive at room temperature, with an emission λmax=695 nm. No emission was detected for complex 23+ at room temperature in MeCN, whereas complex 42+ displayed an emission at about 750 nm. The emission properties of these complexes are compared to those of previously reported Ru and RuPt bimetallic complexes with a related ligand, 2,3-di(2-pyridyl)-5,6-diphenylpyrazine. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18614728
- Volume :
- 8
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Chemistry - An Asian Journal
- Publication Type :
- Academic Journal
- Accession number :
- 88310736
- Full Text :
- https://doi.org/10.1002/asia.201300327