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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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Publication details

The article was received on 22 Jun 2009, accepted on 01 Sep 2009 and first published on 11 Sep 2009


Article type: Paper
DOI: 10.1039/B912264H
CrystEngComm, 2010,12, 413-419

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    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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