Thermal reaction and desorption behaviors of 2,5-diiodothiophene on clean and passivated Au surfaces

Ryoo, Kunkul; Kim, Seong H.

doi:10.1016/j.susc.2007.05.010

Cited by 3 publications

(4 citation statements)

References 25 publications

(31 reference statements)

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“…For IT-2 (also see Figure S5a for IT-1 ) there is a well-defined peak at 619.2 eV, which is characteristic of iodine–gold binding. − This observation shows that the two iodo groups in IT-1 and IT-2 both bind to Au electrodes, suggesting that IT-1 and IT-2 lie flat on Au electrode. In contrast, the I 3d 5/2 region has two peaks for IT-4 , one is located at 619.4 eV, similar to that for IT-1 and IT-2 , and another at 621.3 eV, corresponding to weak or no binding of the iodo group with Au. − These data lead us to conclude that for IT-4 one iodo group binds to Au electrode, but the second iodo group is not attached to the electrode. Note also that the binding energy of the 619.4 eV peak is higher than that of the Au–I – /I 2 bond (618.4 eV), , indicating the formation of a Au–I–C contact without cleaving the C–I bond.…”

Section: Resultsmentioning

confidence: 94%

“…XPS analysis in I 3d 5/2 regime of Au surfaces modified by IT-2 (a) and IT-4 (b). The doublet peak in panel b indicates two distinct iodine species with binding energies for iodine in C–I bond (centered at 621.3 eV) − and in Au–I–C bond (centered at 619.4 eV), − respectively. The brown line is the nonlinear Shirley background subtraction.…”

Section: Resultsmentioning

confidence: 99%

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Non-exponential Length Dependence of Conductance in Iodide-Terminated Oligothiophene Single-Molecule Tunneling Junctions

et al. 2016

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An exponential decrease of molecular conductance with length has been observed in most molecular systems reported to date, and has been taken as a signature of non-resonant tunneling as the conduction mechanism. Surprisingly, the conductance of iodide-terminated oligothiophene molecules presented herein does not follow the simple exponential length dependence. The lack of temperature dependence in the conductance indicates that tunneling still dominates the conduction mechanism in the molecules. Transition voltage spectroscopy shows that the tunneling barrier of the oligothiophene decreases with length, but the decrease is insufficient to explain the non-exponential length dependence. X-ray photoelectron spectroscopy, stretching length measurement, and theoretical calculations show that the non-exponential length dependence is due to a transition in the binding geometry of the molecule to the electrodes in the molecular junctions as the length increases.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Non-exponential Length Dependence of Conductance in Iodide-Terminated Oligothiophene Single-Molecule Tunneling Junctions

et al. 2016

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“…8 2,5-Diiodothiophene is a promising material for this method because the C-I bonds can be selectively dissociated by ultraviolet irradiation, generating thienyl radicals that polymerise. [8][9][10] Vibrational spectroscopy provides a valuable method to characterise the materials and, to this end, the spectra of polythiophene, [11][12][13] oligothiophenes [14][15][16][17][18] and thiophene [19][20][21] have been assigned. However, the spectra of 2,5-diiodothiophene have been little investigated, apart from reports of the infrared spectrum 9,22 and that of its 2,5and 3,4-13 C isotopomers.…”

Section: Introductionmentioning

confidence: 99%

“…An alternative approach is to polymerize a monomer on a patterned surface . 2,5-Diiodothiophene is a promising material for this method because the C–I bonds can be selectively dissociated by ultraviolet irradiation, generating thienyl radicals that polymerize. − …”

Section: Introductionmentioning

confidence: 99%

Structure and Vibrational Spectra of 2,5-Diiodothiophene: A Model for Polythiophene

Parker

Jura

2017

J. Phys. Chem. C

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The structure and vibrational spectroscopy of 2,5-diiodothiophene have been described for the first time. The structure is remarkable in that despite the presence of eight molecules in the unit cell, there is almost no evidence for any interaction between them. This is reflected in the spectra that show coincident modes in the infrared, Raman and inelastic neutron scattering (INS) spectra and almost resolution limited linewidths in the INS spectrum, showing that the both the factor group splitting and the phonon dispersion is very small. This property has led to the use of the compound as a calibrant in INS spectroscopy. The deductions from the spectra are confirmed by a periodic-DFT calculation that allows a complete spectral assignment to be made. Comparison to the INS and Raman spectra of polythiophene (for which 2,5-diiodothiophene may be used as a monomer), shows a marked similarity for the former and a marked difference to the latter. The INS spectrum of polythiophene is dominated by the C-H bending modes, which are unchanged on polymerisation. In contrast, the Raman spectrum of polythiophene is dominated by the changed electronic environment which results in strong electron-phonon coupling and a significant upshift of the C=C stretch modes.

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A Study of 2,5-diiodothiophene for electrical conduction applications

Ryoo

Lee

2012

Macromol. Res.

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Thermal reaction and desorption behaviors of 2,5-diiodothiophene on clean and passivated Au surfaces

Cited by 3 publications

References 25 publications

Non-exponential Length Dependence of Conductance in Iodide-Terminated Oligothiophene Single-Molecule Tunneling Junctions

Non-exponential Length Dependence of Conductance in Iodide-Terminated Oligothiophene Single-Molecule Tunneling Junctions

Structure and Vibrational Spectra of 2,5-Diiodothiophene: A Model for Polythiophene

A Study of 2,5-diiodothiophene for electrical conduction applications

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