Number of the records: 1
Acid-Base Control of Valency within Carboranedithiol Self-Assembled Monolayers: Molecules Do the Can-Can
- 1.
SYSNO ASEP 0488937 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Acid-Base Control of Valency within Carboranedithiol Self-Assembled Monolayers: Molecules Do the Can-Can Author(s) Thomas, J. C. (US)
Goronzy, D. P. (US)
Serino, A. C. (US)
Auluck, H. S. (US)
Irving, O. R. (US)
Jimenez-Izal, E. (US)
Deirmenjian, J. M. (US)
Macháček, Jan (UACH-T) RID, ORCID, SAI
Sautet, P. (US)
Alexandrova, A. N. (US)
Baše, Tomáš (UACH-T) RID, SAI, ORCID
Weiss, P. S. (US)Number of authors 12 Source Title ACS Nano. - : American Chemical Society - ISSN 1936-0851
Roč. 12, č. 3 (2018), s. 2211-2221Number of pages 11 s. Language eng - English Country US - United States Keywords carborane ; dipoles ; molecular switch ; nanoscience Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry Institutional support UACH-T - RVO:61388980 UT WOS 000428972600014 EID SCOPUS 85044499913 DOI 10.1021/acsnano.7b09011 Annotation We use simple acid-base chemistry to control the valency in self-assembled monolayers of two different carboranedithiol isomers on Au{111}. Monolayer formation proceeds via Au-S bonding, where manipulation of pH prior to or during deposition enables the assembly of dithiolate species, monothiol/monothiolate species, or combination. Scanning tunneling microscopy (STM) images identify two distinct binding modes in each unmodified monolayer, where simultaneous spectroscopic imaging confirms different dipole offsets for each binding mode. Density functional theory calculations and STM image simulations yield detailed understanding of molecular chemisorption modes and their relation with the STM images, including inverted contrast with respect to the geometric differences found for one isomer. Deposition conditions are modified with controlled equivalents of either acid or base, where the coordination of the molecules in the monolayers is controlled by protonating or deprotonating the second thiol/thiolate on each molecule. This control can be exercised during deposition to change the valency of the molecules in the monolayers, a process that we affectionately refer to as the `can-can`. This control enables us to vary the density of molecule-substrate bonds by a factor of 2 without changing the molecular density of the monolayer. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2019
Number of the records: 1