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Issue 2, 2010
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Diversity of binding of sulfate and nitrate anions with laterally asymmetric aza cryptands

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Abstract

An X-ray crystallographic study of binding of nitrate and sulfate anions with two laterally asymmetric aza cryptands (Lo and Lm) having different cavity dimensions is reported. A variety of binding modes for these anions have been observed. Cryptand Lm having a larger cavity than that of Lo, prefers to encapsulate a planar nitrate over Td sulfate in its cavity when both anions are available for complexation. A discrete (H2O)29 cluster can be identified as surrounded by six sulfate ions attached to two Lm units. 1H NMR titration results indicate that either [H3Lo]3+ or [H3Lm]3+ binds strongly with sulfate rather than nitrate in solution.

Graphical abstract: Diversity of binding of sulfate and nitrate anions with laterally asymmetric aza cryptands

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Article information


Submitted
22 Jun 2009
Accepted
01 Sep 2009
First published
11 Sep 2009

CrystEngComm, 2010,12, 413-419
Article type
Paper

Diversity of binding of sulfate and nitrate anions with laterally asymmetric aza cryptands

M. C. Das, S. K. Ghosh and P. K. Bharadwaj, CrystEngComm, 2010, 12, 413
DOI: 10.1039/B912264H

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