Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 240, Issue -, Pages 1216-1225Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.09.073
Keywords
Luminescence sensor; Metal ions; Re(I) complexes; C=N isomerization
Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi
- UGC, New Delhi
- Department of Science and Technology (DST), New Delhi
- UGC Meritorious fellowship under the Basic Scientific Research (BSR) Scheme
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Novel imine functionalized monometallic rhenium(I) polypyridine complexes (1-4) comprising phenol moiety with 2,2'-bipyridine ligands L1-L4 have been synthesized and characterized by various spectroscopic techniques. These complexes function as selective and sensitive sensor towards the copper(II) ion demonstrated by UV-vis absorption, luminescence and time-resolved spectroscopic techniques. An enormous enhancement is observed in emission intensity, quantum yield and luminescence lifetime with the addition of copper(II) ion due to the restriction of C=N isomerization in the Re(I) complexes. The strong binding between copper(II) ion and these complexes can be inferred from the binding constant values, which are in the range of 1.1 x 10(4)-2.4 x 10(4) M-1. Furthermore, the structural and the absorption features of the complexes have been supported by density functional theory (DFT) and time-dependent DFT (TDDFT) calculations. (C) 2016 Elsevier B.V. All rights reserved.
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