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Reversible light-dependent molecular switches on Ag/AgCl nanostructures
Citation key ISI:000403943600039
Author Song, W. and Querebillo, C. J. and Goetz, R. and Katz, S. and Kuhlmann, U. and Gernert, U. and Weidinger, I. M. and Hildebrandt, P.
Pages 8380-8387
Year 2017
ISSN 2040-3364
DOI 10.1039/c7nr02760e
Journal NANOSCALE
Volume 9
Number 24
Month JUN 28
Abstract Nanostructured Ag/AgCl substrates were used to generate reversible and highly efficient light-dependent chemical switches based on adsorbed 4,4'-dimercaptoazobenzene (DMAB). DMAB was formed in situ via laser-induced dimerization either from 4-nitrothiophenol (4-NTP) or 4-aminothiophenol (4-ATP). The subsequent reaction pathways of DMAB, however, were quite different as monitored by surface enhanced Raman spectroscopy. In the 4-NTP/DMAB system, AgCl catalyses the reversal of the dimerization. Conversely, irradiation of adsorbed 4-ATP first generated cis-DMAB attached to the surface via two Ag-S bonds, followed by AgCl-catalysed cleavage of one Ag-S bond and cis. trans photoisomerisation of DMAB. In the dark, the trans-isomer thermally reverts to cis-DMAB. The here presented light-dark chemical switches, which work without changing other parameters (e.g., pH, anaerobic vs. aerobic), are based on the (photo) catalytic properties of the Ag/AgCl substrate and do not function on pure metal surfaces.
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