Journal
POLYHEDRON
Volume 28, Issue 6, Pages 1115-1120Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2009.01.035
Keywords
Macrobicyclic ligand; 2-Hydroxy-1-naphthaldehyde; Fluoresce lice spectroscopy; Stability constant; Metal cation
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Funding
- Scientific and Technological Research Council of Turkey (TUBITAK)
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A new Schiff base containing a macrobicyclic moiety was designed and synthesized by reaction of the corresponding macrobicyclic diamine compound and 2-hyclroxy-1-naphthaldehyde. The influence of metal cations such as Zn2+, Mn2+, Fe2+, Fe3+, Co2+, Ni2+ and Pb2+ on the spectroscopic properties of the 2-hydroxy-1-naphtyl group linked to the macrobicyclic moiety with N202S2 mixed donor was investigated in acetonitrile-dichloromethane solution (9.5/0.5) by means of absorption and emission spectrometry. Emission spectra undergo a marked blue shift and enhancement of naphtyl fluorescene in the presence of Fe3+ and Zn2+. The presence of Pb2+, Mn2+, Fe2+, Co2+ and Ni2+ caused a quenching of naphtyl fluorescence. Especially, the quenching was higher than 90% in case of the interaction of Ni2+ and the ligand. The results of spectrophotometric and spectrofluorimetric titration experiments disclosed the complexation properties of the novel ligand with Zn2+, Co2+ and Ni2+ cations. (C) 2009 Elsevier Ltd. All rights reserved.
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