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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.50A [2011] >
IJC-A Vol.50A(09-10) [September-October 2011] >
| Title: | Recognition of nitrates in a discrete dimeric capsular assembly of a triamide half-capsule |
| Authors: | Arunachalam, M
Ghosh, Pradyut |
| Keywords: | Coordination chemistry
Dimeric capsules
Anion recognition
Molecular recognition
Tripodal receptors
Nitrates
Acetates |
| Issue Date: | Sep-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | A newly synthesized tripodal
amide receptor for the recognition of planar anions such as nitrate and acetate
is described. The tripodal host, L1, features a
1,3,5-substituted 2,4,6-trimethylbenzene scaffold bearing three convergent amide
hydrogen bonding functionality and electron-withdrawing p-cyanobenzoyl
terminals. The single-crystal X-ray crystallographic analysis on crystals obtained
upon complexation of L1 with tetrabutylammonium nitrate in acetone
shows the encapsulation of two NO3¯ ions inside the staggered dimeric capsular
assembly of L1. On the other hand, complexation with tetrabutylammonium
acetate in the same solvent system shows non-capsular recognition of acetate
and a water molecule inside the receptor bowl. The p-cyano substitution
in the aryl terminals assists the formation of dimeric capsular assembly of L1
by enhancing the hydrogen bonding tendency of the aryl C-H protons. Though L1
demonstrates capsule formation upon complexation with NO3¯, the geometrically
similar AcO¯
shows non-capsular recognition in the solid state, which may be due the
structural difference between the two anions. |
| Page(s): | 1343-1349 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.50A(09-10) [September-October 2011]
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