Document Detail


Effect of pH on the photophysical properties of two new carboxylic-substituted iridium(iii) complexes.
MedLine Citation:
PMID:  23360907     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Two cyclometalated iridium(iii) complexes have been prepared based on 2-(4-diphenylamino-phenyl)-quinoline and incorporating carboxylic acid ethyl ester (-COOC(2)H(5), and carboxylic acid (-COOH, ) substituents at the 4-position of the quinoline ligand, respectively. The absorption, emission and (1)H NMR spectra of and under alkaline or acidic conditions demonstrate that they respond to the pH of the surrounding solvent environment. The deprotonation of the carboxylic acid group significantly blue-shifts the metal-to-ligand charge transfer absorption band of by 48 nm and enhances the emission quantum-yield in DMSO. In addition, (1)H-NMR titration reveals that is deprotonated into negatively charged in free DMSO-d(6) solution, and the acid-induced N^O ancillary ligands cleavage or replacement in could be ignored. A water-soluble near-neutral optical pH probe with pK(a) of ∼7 is also reported. In aqueous buffer, possesses an obvious emission response with an excellent linearity in the pH range of 6.50-8.00, showing a promising application in bioprocessing.
Authors:
Jiena Weng; Qunbo Mei; Weiwei Jiang; Quli Fan; Bihai Tong; Qidan Ling; Wei Huang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-30
Journal Detail:
Title:  The Analyst     Volume:  -     ISSN:  1364-5528     ISO Abbreviation:  Analyst     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372652     Medline TA:  Analyst     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Key Laboratory for Organic Electronics & Information Displays (KLOEID), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210046, P. R. China. iamqbmei@njupt.edu.cn iamwhuang@njupt.edu.cn.
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