Unusual specificity of a receptor for Nd3+ among other lanthanide ions for selective colorimetric recognition

Das, Priyadip ; Ghosh, Amrita ; Das, Amitava (2010) Unusual specificity of a receptor for Nd3+ among other lanthanide ions for selective colorimetric recognition Inorganic Chemistry, 49 (15). pp. 6909-6916. ISSN 0020-1669

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic100236c

Related URL: http://dx.doi.org/10.1021/ic100236c

Abstract

A rare example of a reversible recognition of Nd3+ by a newly synthesized molecular receptor (L1), having a diazo group as the reporter functionality, is reported. Studies revealed that this receptor eventually forms a [Nd3+]2L1 type complex, through the formation of the intermediate complex [Nd3+]· L1 following a two-step equilibrium process. Respective equilibrium constants for two successive processes were evaluated based on data obtained from the systematic fluorescence titration. Formation of [Nd3+]2L1 caused a detectable change in color, and associated affinity constants were also evaluated from spectrophotometric titration data. A rather unusual binding mode of L1 for Nd3+ ion is established by various spectroscopic studies. The remarkable specificity of L1 for Nd3+, constitutes a rare example of a highly selective receptor for this ion in the presence of excess of all other lanthanide ions.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:59941
Deposited On:08 Sep 2011 10:23
Last Modified:08 Sep 2011 10:23

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