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Modulation in Photophysical Properties of Fluorescent Imidazole Possessing 1,10‐Phenanthroline on Introduction of Ru(bipy) 2 2+ towards Cation Sensing
Author(s) -
Alreja Priya,
Kaur Navneet
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701331
Subject(s) - imidazole , fluorescence , phenanthroline , chemistry , metal ions in aqueous solution , selectivity , stoichiometry , ion , affinities , atom (system on chip) , metal , quenching (fluorescence) , crystallography , stereochemistry , photochemistry , catalysis , organic chemistry , physics , quantum mechanics , computer science , embedded system
The cation binding affinities of imidazole possessing 1,10‐phenathroline ( 1) displayed remarkable variations on complexation with Ru(bipy) 2 2+ ( 2 ). Both 1 and 2 displayed remarkable fluorescence in DMSO solution. The fluorescence emission intensity of 1 was quenched with several metal ions (Cu 2+ , Hg 2+ , Zn 2+ , Co 2+ , Ni 2+ ). The phenanthroline N's owing to their excellent cation binding affinity would be responsible for this, but the 1:2 stoichiometry as revealed by job's plot pointed towards the participation of imidazole N and O atom of methoxy group of 1 . Engaging the phenanthroline N's in metal binding was a step towards selectivity as 2 exhibited quenching with Cu 2+ and Hg 2+ ions only. 1:1 job's plot analysis for 2 once again ascertained the active involvement of imidazole N and O atom of methoxy group in cation sensing process.