Please use this identifier to cite or link to this item:
|Title:||Computational design of thiourea-based cyclophane sensors for small anions|
|Citation:||Xie, H., Wong, M.W. (2012). Computational design of thiourea-based cyclophane sensors for small anions. Australian Journal of Chemistry 65 (3) : 303-313. ScholarBank@NUS Repository. https://doi.org/10.1071/CH11389|
|Abstract:||The hostguest binding properties of a tri-thiourea cyclophane receptor (1) with several common anions have been investigated using density functional theory (DFT) and molecular dynamics calculations. Receptor 1 is predicted to be an effective receptor for binding small halogen and Y-shaped (NO 3 - and AcO -) anions in the gas phase, cyclohexane and chloroform. The calculated order of anion binding affinity for the receptor 1 in chloroform is F ->Cl ->AcO ->NO 3 ->Br ->H 2PO 4 ->HSO 4 -. The binding free energies are strongly influenced by a dielectric solvent medium. The structures of the receptoranion complexes are characterized by multiple (typically 6) hydrogen bonds in all cases. The overall binding affinity of various anions is determined by the basicity of anion, size and shape of the binding site, and solvent medium. Explicit chloroform solvent molecular dynamics simulations of selected receptoranion complexes reveal that the anions are strongly bound within the binding pocket via hydrogen-bonding interactions to all the receptor protons throughout the simulation. A sulfur analogue of receptor 1 (2), with a larger central cavity, is shown to be a more effective sensor than 1 for small anions. Two different approaches to develop the thiourea-based cyclophane receptor into a chromogenic sensor were examined. © 2011 CSIRO.|
|Source Title:||Australian Journal of Chemistry|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 10, 2018
WEB OF SCIENCETM
checked on Jun 27, 2018
checked on Jun 8, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.