We present resonance Raman measurements of crystalline trishomocubane and diamantane dimers containing a C=C double bond. Raman spectra were recorded with excitation energies between 2.33 eV and 5.42 eV. The strongest enhancement is observed for the C=C stretch vibration and a bending mode involving the two carbon atoms of the C=C bond, corresponding to the B2g wagging mode of ethylene. This is associated with the localization of the π-HOMO and LUMO and the elongation of the C=C bond length and a pyramidalization of the two sp2-hybridized carbon atoms at the optical excitation. The observed Raman resonance energies of the trishomocubane and diamantane dimers are significantly lower than the HOMO-LUMO gaps of the corresponding unmodified diamondoids.
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21 January 2014
Research Article|
January 16 2014
UV resonance Raman analysis of trishomocubane and diamondoid dimers
Reinhard Meinke;
Reinhard Meinke
a)
1Institut für Festkörperphysik,
Technische Universität Berlin
, Hardenbergstr. 36, D-10623 Berlin, Germany
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Robert Richter;
Robert Richter
2Institut für Optik und Atomare Physik,
Technische Universität Berlin
, Hardenbergstr. 36, D-10623 Berlin, Germany
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Andrea Merli;
Andrea Merli
2Institut für Optik und Atomare Physik,
Technische Universität Berlin
, Hardenbergstr. 36, D-10623 Berlin, Germany
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Andrey A. Fokin;
Andrey A. Fokin
3Institute of Organic Chemistry,
Justus-Liebig University
, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany
4Department of Organic Chemistry,
Kiev Polytechnic Institute
, pr. Pobedy 37, 03056 Kiev, Ukraine
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Tetyana V. Koso;
Tetyana V. Koso
3Institute of Organic Chemistry,
Justus-Liebig University
, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany
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Vladimir N. Rodionov;
Vladimir N. Rodionov
4Department of Organic Chemistry,
Kiev Polytechnic Institute
, pr. Pobedy 37, 03056 Kiev, Ukraine
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Peter R. Schreiner;
Peter R. Schreiner
3Institute of Organic Chemistry,
Justus-Liebig University
, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany
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Christian Thomsen;
Christian Thomsen
1Institut für Festkörperphysik,
Technische Universität Berlin
, Hardenbergstr. 36, D-10623 Berlin, Germany
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Janina Maultzsch
Janina Maultzsch
1Institut für Festkörperphysik,
Technische Universität Berlin
, Hardenbergstr. 36, D-10623 Berlin, Germany
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a)
Electronic mail: rene@physik.tu-berlin.de
J. Chem. Phys. 140, 034309 (2014)
Article history
Received:
October 22 2013
Accepted:
December 27 2013
Citation
Reinhard Meinke, Robert Richter, Andrea Merli, Andrey A. Fokin, Tetyana V. Koso, Vladimir N. Rodionov, Peter R. Schreiner, Christian Thomsen, Janina Maultzsch; UV resonance Raman analysis of trishomocubane and diamondoid dimers. J. Chem. Phys. 21 January 2014; 140 (3): 034309. https://doi.org/10.1063/1.4861758
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