Nitrosoarene Dimerization on Two- and Three-dimensional Gold Surfaces

Biljan, Ivana and Medančić, Tina and Kralj, Marko and Mišić Radić, Tea and Vančik, Hrvoj (2013) Nitrosoarene Dimerization on Two- and Three-dimensional Gold Surfaces. Croatica Chemica Acta, 86 (1). pp. 83-94. ISSN 0011-1643

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In the present study, we investigated nitrosoarene dimerization on an Au(111) and on the surface of gold nanoparticles (AuNPs). High-resolution STM images revealed that 8-thiocyanatooctyl-4-nitrosobenzoate (NCS(CH28OOCC6H4NO) forms well-ordered monolayer on an Au(111) surface displaying hexagonal 3√3 x 3√3 structure. AFM data indicated that this compound also dimerize on an Au(111)surface thus forming bilayers. On contrary, adsorption of 6-(4-nitrosophenoxy)hexane-1-thiol(HS(CH2)6OC6H4NO) on an Au(111)leads only to poorly organized monolayer. Furthermore, it was found that nitrosoarene derivatives 8-thiocyanatooctyl-4-nitrosobenzoate(NCS(CH2)8OOCC6H4NO) and 3-thiocyanatopropyl-4-nitrosobenzoate (NCS(CH2)3OOCC6H4NO)are present as dimers on the surface of AuNPs. There is no appreciable quantity of dimeric species with free thiocyanate termini indicating interlinkage of AuNPs through azodioxide bonds. Besides the characteristic surface plasmon band, UV-vis spectra showed an additional red-shifted band that might have origin in aggregation of AuNPs. This was further supported by TEM revealing the appearence of larger aggregates in addition to smaller AuNPs.

Item Type: Article
Keywords: C-nitrosoarenes; azodioxides; self-assembled monolayers; self-assembled bilayers; gold nanoparticles
Date: 2013
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Faculty of Science > Department of Chemistry
Publisher: Hrvatsko kemijsko društvo
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Depositing User: Branka Maravic
Date Deposited: 24 Apr 2014 12:37
Last Modified: 24 Apr 2014 12:37

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