Monolayers of biphenyl-3,4',5-tricarboxylic acid formed on Cu and Ag from solution
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Self-assembled monolayers of biphenyl-3,4’,5-tricarboxylic acid (BPTCA) on Au(111)/mica substrates modified by under-potential deposited layers of Cu and Ag were studied by scanning tunneling microscopy under ambient conditions as well as by synchrotron based X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy. BPTCA forms distinctly different layers on Ag and Cu due to a pronounced influence of the substrate on the balance of intermolecular and molecule-substrate interactions. On Cu a highly crystalline commensurate row structure is formed, described by a 6×√3 unit cell, a molecular tilt of 45-50° relative to the surface normal, and a bipodal bidentate adsorption geometry. In contrast, incommensurate row structures are formed on Ag which are characterized by significant waves and kinks, a monopodal bidentate adsorption geometry, and a tilt angle of 25-30°. While BPTCA parallels its smaller homologue, benzene-1,3,5-tricarboxylic acid, with regard to the substrate specific monopodal and bipodal adsorption geometries, the preparation conditions for the monolayer on Cu and the film structure on Ag are pronouncedly different. The results are discussed in terms of the steric requirements and molecular symmetry of BPTCA.
Aitchison , H , Lu , H , Buck , M & Zharnikov , M 2015 , ' Monolayers of biphenyl-3,4',5-tricarboxylic acid formed on Cu and Ag from solution ' Journal of Physical Chemistry C , vol. 119 , no. 25 , pp. 14114–14125 . DOI: 10.1021/acs.jpcc.5b01176
Journal of Physical Chemistry C
Copyright © 2015 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see: https://dx.doi.org/10.1021/acs.jpcc.5b01176
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