Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1118, Issue -, Pages 325-334Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2016.04.006
Keywords
Schiff-base; Fluorescence; Zinc sensor; X-ray crystal structure; DFT; Cell imaging
Categories
Funding
- Department of Science and Technology, New Delhi
- UGC, New Delhi
- CSIR, New Delhi
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The selective fluorescence zinc(II) sensing properties of a Schiff-base compound, 2-methoxy-6-(2-morpholinoethyliminomethyl)phenol (HL) have been explored. The emission intensity of HL in the presence of one equivalent of Zn2+ ion increases by about 25 times. Several other metal ions, except Cd2+ and Ni2+, have not been able to increase the emission intensity of HL significantly. The quantum yield and life-time of HL have also been increased in the presence of Zn2+ ions. The enhancement in fluorescence intensity of HL is mainly due to the restriction of ESIPT, CHEF and PET on complex formation. HL forms a complex with Zn2+ in 1:1 ratio as evidenced by Job's plot analysis and X-ray single crystal structure determination. Some theoretical calculations have been performed to get a better view on the nature of the observed electronic transitions. The probe has been applied for imaging of DLD-1, human colorectal adenocarcinoma cell. (C) 2016 Elsevier B.V. All rights reserved.
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