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  Ordered self-assembled monolayers of 4,4 '-biphenyldithiol on polycrystalline silver: Suppression of multilayer formation by addition of tri-n-butylphosphine

Weckenmann, U., Mittler, S., Naumann, K., & Fischer, R. A. (2002). Ordered self-assembled monolayers of 4,4 '-biphenyldithiol on polycrystalline silver: Suppression of multilayer formation by addition of tri-n-butylphosphine. Langmuir, 18(14), 5479-5486.

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 Creators:
Weckenmann, U., Author
Mittler, Silvia1, Author           
Naumann, K., Author
Fischer, R. A., Author
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 Abstract: Self-assembled monolayers (SAMs) of 4-biphenylthiol (BT) and 4,4'-biphenyldithiol (BDT) formed on polycrystalline silver substrates were characterized by surface plasmon resonance spectroscopy (SPR), reflection absorption infrared spectroscopy (RAIRS), and X-ray photoelectron spectroscopy (XPS). The RAMS measurements reveal that the molecules in a BT-SAM are oriented perpendicular to the surface whereas the adsorption of BDT results in the formation of multilayers due to the oxidative coupling of the terminal thiol groups forming disulfide-bridged species. The process of multilayer formation was monitored by SPR and RAIRS indicating that BDT initially forms a monolayer which exhibits a structure similar to the one found for BT and that disorder is introduced by the rapid oxidation of the exposed thiol groups resulting in the formation of a multilayer. The addition of tri-n-butylphosphine to the self- assembly solution of 4,4'-biphenyldithiol prevents the formation of multilayers and allows the generation of well- ordered monolayers of the dithiol in which the molecules adopt a standing-up orientation as observed for 4-biphenylthiol. The existence of free thiol groups at the surface of the dithiol SAM was proven by quantitative XPS measurements.

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Language(s): eng - English
 Dates: 2002-07-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28690
ISI: 000176627000025
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Title: Langmuir
  Alternative Title : Langmuir
Source Genre: Journal
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Pages: - Volume / Issue: 18 (14) Sequence Number: - Start / End Page: 5479 - 5486 Identifier: ISSN: 0743-7463