location: Current position: Home >> Scientific Research >> Paper Publications

Synthesis and ECL performance of highly efficient bimetallic ruthenium tris-bipyridyl complexes

Hits:

Indexed by:期刊论文

Date of Publication:2012-10-28

Journal:DALTON TRANSACTIONS

Included Journals:SCIE、EI、PubMed、Scopus

Volume:41

Issue:40

Page Number:12434-12438

ISSN No.:1477-9226

Abstract:In order to find the ideal carbon chain linkage number n for achieving the highest ECL in bimetallic ruthenium tris-bipyridyl complexes, a series of novel complexes [(bpy)(2)Ru(bpy')(CH2)(n)(bpy')Ru(bpy)(2)](4+) (1, where bpy is 2,2'-bipyridyl, n = 10, 12, 14) for a coreactant electrochemiluminescence (ECL) system have been synthesized. Their ECL properties at a Au electrode have been studied in 0.1 M phosphate buffer by using tripropylamine (TPrA), 2-(dibutylamino)ethanol (DBAE) and melamine as the coreactant, to compare with that of the previously reported bimetallic ruthenium analogous complex [(bpy)(2)Ru(bpy')(CH2)(8)(bpy')Ru(bpy)(2)](4+). The results demonstrate that the ECL intensity depends largely on the length of the saturated carbon chain linkage number n. The highest ECL is reached when n = 10, suggesting that a synergistic effect on ECL enhancement co-exists between the two intramolecular linked ruthenium activating centers. Density functional theory (DFT) calculation demonstrated that the optimized bond distances between Ru and N(bpy') are the longest both in the ground and the excited triplet states in the case of n = 10, while those for Ru and N(bpy) are the shortest in the excited triplet states. All these factors may be responsible for the above mentioned results. This study provided a methodology to further improve and tune ECL efficiency by using bimetallic ruthenium complexes linked by a flexible saturated carbon chain.

Pre One:Detection of malachite green and leucomalachite green based on electrochemiluminescence of mono- and bimetallic ruthenium tris-bipyridyl complexes at an Au electrode

Next One:Interaction study on DNA, single-wall carbon nanotubes and acridine orange