期刊
NEW JOURNAL OF CHEMISTRY
卷 43, 期 9, 页码 3899-3906出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nj06511j
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资金
- Council of Scientific and Industrial Research (CSIR), New Delhi, India [01(2814)/17/EMR-II]
- Department of Science and Technology (DST), Govt of India
Coumarinyl-rhodamine, HCR, served as an extremely selective sensor for Pd2+ ions in ethanol/H2O (8 : 2, v/v, HEPES buffer, pH 7.2) solution and the limit of detection (LOD) was 18.8 nM (3 sigma method). The free sensor, HCR, was weakly emissive and in the presence of Pd2+, the colour changed from straw to pink with very strong emission at 598 nm in the presence of eighteen other cations. A plausible mechanism involved opening of the spirolactam ring of rhodamine on interaction with Pd2+, which was justified by structure optimization and transition energy calculations using the DFT technique. HCR underwent 1:1 complexation with Pd2+, which was confirmed via the Job's plot, mass spectra and Benesi-Hildebrand plot (association constant K-a, 9.1 x 10(4) M-1). A separate in vitro experiment showed that HCR could specifically sense Pd2+ in MCF7 (human breast adenocarcinoma) cell lines.
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