|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.50A [2011] >
IJC-A Vol.50A(09-10) [September-October 2011] >
| Title: | Osmium(II) mixed-chelate derived from imidazole 4,5-bis(benzimidazole) and 2,2'-bipyridine as multichannel sensor for anions: Synthesis, structural characterization and binding studies |
| Authors: | Saha, Debasish
Das, Shyamal
Maity, Dinesh
Baitalik, Sujoy |
| Keywords: | Coordination chemistry
Metalloreceptors
Multichannel sensors
Sensors
Anion sensors
Fluoride
Acetate
Anion binding |
| Issue Date: | Sep-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Mixed-ligand complex of
composition [(bpy)2Os(H3Imbzim)](ClO4)2∙2H2O
(1), where H3Imbzim = 4,5-bis(benzimidazole-2-yl)imidazole and bpy = 2,2¢-bipyridine, has been synthesized and characterized using
standard analytical and spectroscopic techniques. The X-ray crystal structure
of the complex has been determined which showed that it crystallized in triclinic form with
the space group P-1. The anion binding properties of the complex has been thoroughly investigated in solution
using absorption, emission, and 1H NMR spectral measurements. The
metalloreceptor acts as sensor for F-, AcO-, and to some
extent for H2PO4- anions. Although at
relatively lower concentration of anions the 1:1 H-bonded adduct is formed, in
the presence of excess of anions deprotonation of the imidazole N–H fragments
occurs which is accompanied by a distinct change of color. Double deprotonation
is also observed in the presence of hydroxide. The binding affinities of
different anions towards the receptors have been evaluated. Cyclic voltammetry
measurements carried out in acetonitrile have provided evidence in favor of an
anion-dependent electrochemical response of the receptor with F- and
AcO- ions. |
| Page(s): | 1418-1428 |
| 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]
|
|
