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Title: Synthesis, characterization, electrochemistry and photophysical studies of tetranuclear ruthenium(II) complexes with two new spacers containing four 1,10-phenanthroline units as donor
Authors: Paul, Parimal
Tyagi, Beena
Natarajan, P
Issue Date: Sep-2003
Publisher: NISCAIR-CSIR, India
Abstract: Two novel tetranucleating spacers (BL1 and BL2) incorporating four 1,10-phenanthroline units have been synthesized and characterized. The reaction of these spacers with the building block cis-[Ru(bpy)2Cl2] resulted in the formation of tetranuclear complexes [{Ru(bpy)2 }4BL1][PF6]8.2H2O and [{Ru(bpy)2}4BL2][PF6]8.2H2O. Cyclic voltammograms of these complexes show Ru(II) → Ru(III) oxidation at +1.25 V (vs SCE), and a few ligand-based reductions in the region -1.32 to -1.54 V. Both complexes show strong metal-to- ligand charge-transfer (MLCT) band in the visible region (457 and 456 nm). These complexes exhibit strong emission band (3MLCT) at 612 nm. The excited state life-times of both the complexes have been determined by laser flash photolysis experiments. The observed life-times, 252 ns for 1 and 226 ns for 2, and also electrochemical results, however suggest no intercomponent electronic interaction between the metal centers. The transient absorption difference spectra show bleaching of the MLCT band around 450 nm.
Page(s): 2283-2289
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.42A(09) [September 2003]

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