Structural aspects of self-assembly of thienoviologen molecular conductors on gold substrates

Martin Albers (Corresponding Author), Jari Likonen, Jouko Peltonen, Olle Teleman, Helge Lemmetyinen

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The adsorption of various monomethylated π-extended viologen compounds onto self-assembled layers of octadecylmercaptan (ODM) on gold was investigated with secondary ion mass spectroscopy (SIMS) and atomic force microscopy (AFM).
SIMS results indicated that the monomethylated viologen 5-(4-pyridyl)-5′-[4-(N-methyl)pyridinio]-2,2′-bithiophene iodide (PT2) adsorbed much more strongly onto the ODM self-assembled layers at 50 μM adsorption concentration in ethanol, while very similar compounds were much less effective in their adsorption even at much higher adsorption concentrations.
The formation of multilayers of PT2 could be observed by AFM. Some structural features of the viologens, (dipole moment and polarizability), were calculated with semi-empirical quantum chemical calculations (MOPAC/AM1).
One compound, PF2, having a slightly larger molecular length, dipole moment and polarizability than PT2, did not assemble noticeably onto the surface due to its larger solubility.
The large difference in efficiency of adsorption can be related to a combination of length and absence of hydrophilic groups at the free pyridine side of the monomethylated viologens.
Original languageEnglish
Pages (from-to)114-119
JournalThin Solid Films
Volume330
Issue number2
DOIs
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed

Fingerprint

Viologens
Gold
Self assembly
self assembly
conductors
gold
Adsorption
adsorption
Substrates
Dipole moment
Atomic force microscopy
dipole moments
mass spectroscopy
atomic force microscopy
Spectroscopy
Ions
Iodides
Pyridine
iodides
pyridines

Cite this

Albers, Martin ; Likonen, Jari ; Peltonen, Jouko ; Teleman, Olle ; Lemmetyinen, Helge. / Structural aspects of self-assembly of thienoviologen molecular conductors on gold substrates. In: Thin Solid Films. 1998 ; Vol. 330, No. 2. pp. 114-119.
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abstract = "The adsorption of various monomethylated π-extended viologen compounds onto self-assembled layers of octadecylmercaptan (ODM) on gold was investigated with secondary ion mass spectroscopy (SIMS) and atomic force microscopy (AFM). SIMS results indicated that the monomethylated viologen 5-(4-pyridyl)-5′-[4-(N-methyl)pyridinio]-2,2′-bithiophene iodide (PT2) adsorbed much more strongly onto the ODM self-assembled layers at 50 μM adsorption concentration in ethanol, while very similar compounds were much less effective in their adsorption even at much higher adsorption concentrations. The formation of multilayers of PT2 could be observed by AFM. Some structural features of the viologens, (dipole moment and polarizability), were calculated with semi-empirical quantum chemical calculations (MOPAC/AM1). One compound, PF2, having a slightly larger molecular length, dipole moment and polarizability than PT2, did not assemble noticeably onto the surface due to its larger solubility. The large difference in efficiency of adsorption can be related to a combination of length and absence of hydrophilic groups at the free pyridine side of the monomethylated viologens.",
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Structural aspects of self-assembly of thienoviologen molecular conductors on gold substrates. / Albers, Martin (Corresponding Author); Likonen, Jari; Peltonen, Jouko; Teleman, Olle; Lemmetyinen, Helge.

In: Thin Solid Films, Vol. 330, No. 2, 1998, p. 114-119.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Structural aspects of self-assembly of thienoviologen molecular conductors on gold substrates

AU - Albers, Martin

AU - Likonen, Jari

AU - Peltonen, Jouko

AU - Teleman, Olle

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AB - The adsorption of various monomethylated π-extended viologen compounds onto self-assembled layers of octadecylmercaptan (ODM) on gold was investigated with secondary ion mass spectroscopy (SIMS) and atomic force microscopy (AFM). SIMS results indicated that the monomethylated viologen 5-(4-pyridyl)-5′-[4-(N-methyl)pyridinio]-2,2′-bithiophene iodide (PT2) adsorbed much more strongly onto the ODM self-assembled layers at 50 μM adsorption concentration in ethanol, while very similar compounds were much less effective in their adsorption even at much higher adsorption concentrations. The formation of multilayers of PT2 could be observed by AFM. Some structural features of the viologens, (dipole moment and polarizability), were calculated with semi-empirical quantum chemical calculations (MOPAC/AM1). One compound, PF2, having a slightly larger molecular length, dipole moment and polarizability than PT2, did not assemble noticeably onto the surface due to its larger solubility. The large difference in efficiency of adsorption can be related to a combination of length and absence of hydrophilic groups at the free pyridine side of the monomethylated viologens.

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