5737-13-3Relevant articles and documents
Investigation of thresholds in laser-induced carbonization of sumanene derivatives through in situ observation utilizing a Raman spectroscope
Inada, Yuhi,Amaya, Toru,Hirao, Toshikazu
, p. 18523 - 18530 (2015)
A useful method was demonstrated to investigate 532 nm laser energy threshold to carbonize various compounds including sumanene derivatives through in situ observation utilizing a micro-Raman spectrometer. It was revealed that the thresholds of sumanene derivatives are lower than those of the planar partial structures of sumanene derivatives. Moreover, [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) shows a considerably lower threshold than the sumanene derivatives utilizing this method. This work can be expected to contribute toward the evolution of laser-induced carbonization-based chemistry.
Contorted tetrabenzoacenes of varied conjugation: Charge transport study with single-crystal field-effect transistors
Huang, Ding-Chi,Kuo, Chi-Hsien,Ho, Man-Tzu,Lin, Bo-Chao,Peng, Wei-Tao,Chao, Ito,Hsu, Chao-Ping,Tao, Yu-Tai
supporting information, p. 7935 - 7943 (2017/08/17)
A series of contorted and polyfused aromatic tetrabenzoacene derivatives differing in conjugation length were synthesized and characterized. X-ray diffraction revealed the contorted molecular shape, as well as the packing arrangement of these molecules. Thus unsubstituted tetrabenzoacenes showed a shifted or perfect face-to-face π-stacking depending on their conjugation length. The single crystals of these tetrabenzoacenes were used as conducting channels in fabricating field-effect transistors (SCFETs). Tetrabenzotetracene (TBT) exhibited the highest measured mobility, approaching 0.81 cm2 V-1 s-1 (average 0.64 cm2 V-1 s-1) among these molecules. In contrast, theoretical calculation showed that the tetrabenzooctacene (TBO) crystal has large-area, face-to-face π-packing, with the highest intermolecular coupling in the series. The lower charge mobility (average 0.32 cm2 V-1 s-1, highest 0.55 cm2 V-1 s-1) observed was rationalized as a result of possible involvement of delocalized polaron formation due to comparable electronic coupling and reorganization energy in TBO, as supported by the Monte Carlo simulation with this delocalized effect taken into account.
Energy transfer in bichromophoric molecules: The effect of symmetry and donor/acceptor energy gap
Yip,Levy, Donald H.,Kobetic, Renata,Piotrowiak, Piotr
, p. 10 - 20 (2007/10/03)
The dependence of the rate of singlet excitation transfer on the donor-acceptor energy gap was investigated in bichromophoric spiranes with symmetry-forbidden zero-order electronic coupling. The fluorescence measurements were performed in a supersonic jet in order to avoid collisional and inhomogeneous line broadening. Fluorescence excitation spectra and single-vibronic-level emission spectra of the model chromophores cyclopentaphenanthrene and 1,8-dimethylnaphthalene and the bichromophores spirofluorenephenanthrene and spirofluorenenaphthalene are presented and analyzed. Although the transition moments of the linked chromophores are rigorously perpendicular and the exchange coupling between the v′ = 0 states is computationally shown to be zero, all spiranes with energy gaps larger than ～1000 cm-1 exhibited complete electronic energy transfer from all vibrational states of the electronically excited donor, including the undistorted v′ = 0 state. This behavior is explained in terms of vibronic coupling between the sparse states of the donor and the dense manifold (pseudocontinuum) of the acceptor states. The electronic energy transfer was sufficiently fast to result in measurable lifetime broadening of the donor absorption lines, from which the kEET was estimated. The results demonstrate that the zero-order picture overestimates the degree of the molecular orbital symmetry control over electronic energy transfer and charge-transfer rates and that at sufficiently high driving forces the vibronically mediated "symmetry-forbidden" electronic energy transfer can be very rapid (～1 × 1012 s-1).
