Uv Resonance Raman Analysis Of Trishomocubane And Diamondoid Dimers

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 B-2g wagging mode of ethylene. This is associated with the localization of the pi-HOMO and LUMO and the elongation of the C = C bond length and a pyramidalization of the two sp(2)-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. (C) 2014 AIP Publishing LLC.