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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/11009

Title: Lower rim 1,3-di-amide-derivative of calix[4]arene possessing bis-[N-(2,2 '-dipyridylamide)} pendants: a dual fluorescence sensor for Zn2+ and Ni2+
Authors: JOSEPH, R
RAMANUJAM, B
PAL, H
RAO, CP
Keywords: transition-metal ions
selective recognition
chemosensor
hg2+
calix<4>arenes
derivatives
absorption
complexes
binding
zn(ii)
Issue Date: 2008
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Citation: TETRAHEDRON LETTERS, 49(43), 6257-6261
Abstract: Single crystal XRD structure of the lower rim 1,3-di-amide-derivative of calix[4]arene possessing bis-{N(2,2 '-dipyridylamide)} pendants (L) exhibit two distinct binding cores, viz., N-4 and O-6. L was found to be selective for Zn2+ by switch-on and for Ni2+ by switch-off fluorescence by forming 1: 1 complexes. The binding and the composition of the complex formed have been addressed based on steady state and time-resolved fluorescence spectroscopy in addition to the absorption and ESI MS. As L can detect Zn2+ and Ni2+ to a concentration as low as 142 and 203 ppb, respectively, L can be a very sensitive molecular probe for these ions. The coordination details of the metal ion-bound complexes have been addressed based on ab initio calculations showing that the stabilization energies are commensurate with the coordination formed. (C) 2008
URI: http://dx.doi.org/10.1016/j.tetlet.2008.08.049
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11009
http://hdl.handle.net/10054/11009
ISSN: 0040-4039
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