Coordination-based molecular assemblies of oligofurans and oligothiophenes

Adva Hayoun Barak, Graham De Ruiter, Michal Lahav, Sagar Sharma, Ori Gidron, Guennadi Evmenenko, Pulak Dutta, Michael Bendikov, Milko van der Boom

Research output: Contribution to journalArticle

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Abstract

Molecular assemblies (MAs) of oligofurans and oligothiophenes were formed from solutions on various substrates. These films were obtained by alternating deposition of organic chromophores (oligofurans or oligothiophenes) and a palladium salt. These coordination-based MAs were characterized by UV/Vis spectroscopy, spectroscopic ellipsometry, atomic force microscopy (AFM), X-ray reflectivity (XRR), X-ray photoelectron spectroscopy (XPS), and electrochemistry. The MAs exhibit similar electrochemical behavior and their growth and structure are apparently not affected when different organic template layers are used. The density of the MAs is a function of the structure of the molecular component. The oligothiophene density is approximately 50 % higher than that observed for the oligofuran-based assemblies. The optical and electrochemical properties of the MAs scale linearly with their thickness. The UV/Vis data indicate that upon increasing the film thickness, there is no significant conjugation between the metal-separated organic chromophores. DFT calculations confirmed that the HOMO-LUMO gap of the surface-bound oligofuran and oligothiophene metal oligomers do not change significantly upon increasing their chain length. However, electrochemical measurements indicate that the susceptibility of the MAs towards oxidation is dependent on the number of chromophore units. Coming to the surface: Surface-bound molecular assemblies (MA-1 to MA-3) were constructed by an iterative solution deposition approach. The formed MAs consist of either oligofuran or oligothiophene chromophores coordinated to a palladium salt.

Original languageEnglish
Pages (from-to)8821-8831
Number of pages11
JournalChemistry - A European Journal
Volume19
Issue number27
DOIs
Publication statusPublished - Jul 1 2013

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Chromophores
Palladium
Salts
Metals
Spectroscopic ellipsometry
Electrochemistry
Ultraviolet spectroscopy
Electrochemical properties
Chain length
Oligomers
Discrete Fourier transforms
Film thickness
Atomic force microscopy
X ray photoelectron spectroscopy
Optical properties
X rays
Oxidation
Substrates

Keywords

  • chromophores
  • oligomers
  • palladium
  • self-assembly
  • thin films

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Hayoun Barak, A., De Ruiter, G., Lahav, M., Sharma, S., Gidron, O., Evmenenko, G., ... van der Boom, M. (2013). Coordination-based molecular assemblies of oligofurans and oligothiophenes. Chemistry - A European Journal, 19(27), 8821-8831. https://doi.org/10.1002/chem.201300034

Coordination-based molecular assemblies of oligofurans and oligothiophenes. / Hayoun Barak, Adva; De Ruiter, Graham; Lahav, Michal; Sharma, Sagar; Gidron, Ori; Evmenenko, Guennadi; Dutta, Pulak; Bendikov, Michael; van der Boom, Milko.

In: Chemistry - A European Journal, Vol. 19, No. 27, 01.07.2013, p. 8821-8831.

Research output: Contribution to journalArticle

Hayoun Barak, A, De Ruiter, G, Lahav, M, Sharma, S, Gidron, O, Evmenenko, G, Dutta, P, Bendikov, M & van der Boom, M 2013, 'Coordination-based molecular assemblies of oligofurans and oligothiophenes', Chemistry - A European Journal, vol. 19, no. 27, pp. 8821-8831. https://doi.org/10.1002/chem.201300034
Hayoun Barak A, De Ruiter G, Lahav M, Sharma S, Gidron O, Evmenenko G et al. Coordination-based molecular assemblies of oligofurans and oligothiophenes. Chemistry - A European Journal. 2013 Jul 1;19(27):8821-8831. https://doi.org/10.1002/chem.201300034
Hayoun Barak, Adva ; De Ruiter, Graham ; Lahav, Michal ; Sharma, Sagar ; Gidron, Ori ; Evmenenko, Guennadi ; Dutta, Pulak ; Bendikov, Michael ; van der Boom, Milko. / Coordination-based molecular assemblies of oligofurans and oligothiophenes. In: Chemistry - A European Journal. 2013 ; Vol. 19, No. 27. pp. 8821-8831.
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