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Surface-enhanced Raman scattering studies of rhodanines: Evidence for substrate surface-induced dimerization

Surface-enhanced Raman scattering studies of rhodanines: Evidence for substrate surface-induced dimerization

Jabeen, Saima, Dines, Trevor J., Withnall, Robert, Leharne, Stephen A. and Chowdhry, Babur Z. (2009) Surface-enhanced Raman scattering studies of rhodanines: Evidence for substrate surface-induced dimerization. Physical Chemistry Chemical Physics, 11 (34). pp. 7476-7483. ISSN 1463-9076 (Print), 1463-9084 (Online) (doi:10.1039/b905008f)

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Abstract

The surface-enhanced Raman scattering (SERS) spectra of rhodanine adsorbed on silver nanoparticles have been examined using 514.5 and 632.8 nm excitation. There is evidence that, under the experimental conditions used, rhodanine undergoes a nanoparticle surface-induced reaction resulting in the formation of a dimeric species via the active methylene group in a process which is analogous to the Knoevenagel reaction. The experimental observations are supported by DFT calculations at the B3-LYP/cc-pVDZ level. Calculated energies for the interaction of the E and Z isomers of the dimers of rhodanine with silver nanoparticles support a model in which the (intra-molecular hydrogen bonded) E isomer dimer is of lower energy than the Z isomer. A strong band, at 1566 cm(-1), in the SERS spectrum of rhodanine is assigned to the nu(C=C) mode of the dimer species.

Item Type: Article
Additional Information: [1] First published online: 21 Jul 2009. [2] First published in print: September 14 2009. [3] Published as: Physical Chemistry Chemical Physics, 2009, 11 (34) pp. 7476-7483.
Uncontrolled Keywords: spectrum analysis, Raman, rhodanines, molecular structure, dimerization, silver
Subjects: Q Science > QD Chemistry
Faculty / Department / Research Group: Faculty of Engineering & Science > Department of Life & Sports Sciences
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Related URLs:
Last Modified: 05 Dec 2016 14:18
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/1578

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