Radiative relaxation in oligosilane aggregates

Molecular Orientation in Vacuum-Deposited Peralkyloligosilane Thin Films

“…In accordance with the molecular exciton model, the amount of the blue-shift of side-by-side packed molecular aggregates with respect to the isolated molecule will be determined both by the intermolecular distance and tilt angle of the molecules against the packing direction. Recently, we have found that the fluorescence spectra and their transient behaviors of oligosilane aggregates in frozen solvents were well described by this model . It can also explain the longest peak wavelength of band A when the effect of the closer packing is assumed to overwhelm that of the tilted alignment.…”

“…Recently, we have found that the fluorescence spectra and their transient behaviors of oligosilane aggregates in frozen solvents were well described by this model. 10 It can also explain the longest peak wavelength of band A when the effect of the closer packing is assumed to overwhelm that of the tilted alignment. Further discussion of each absorption band observed in vacuum-deposited PrS10 thin films with respect to its molecular orientation (or conformation) is beyond the scope of this paper and will be given elsewhere.…”

“…Since the first report of the synthesis of permethylated linear oligosilanes, 2 various kinds of related compounds were synthesized 1,[3][4][5][6] and examined by optical [5][6][7][8][9][10] and NMR spectroscopy. 11 Mesomorphic properties have recently been studied for permethylated oligosilanes with various end groups.…”

“…Since the first report of the synthesis of permethylated linear oligosilanes, various kinds of related compounds were synthesized ,− and examined by optical − and NMR spectroscopy . Mesomorphic properties have recently been studied for permethylated oligosilanes with various end groups. ,, Structures and physical properties of these oligomers in thin films also attracted attention in the past decade. − Structures of vacuum-deposited thin films were investigated for permethyldodecasilane, Me(SiMe 2 ) 12 Me, for which highly ordered multilayered structures were found. , Such well-ordered multilayered structures were also observed in vacuum-deposited thin films of π-conjugated oligomers with varying molecular structures .…”