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These data demonstrate that the solid-state distance restraints are only in agreement with the solid-state backbone chemical shifts, and the solution-state distance restraints are only in agreement with the solution-state backbone chemical shifts.
The red shift observed in the solid-state absorbance spectra can be attributed to increased intermolecular π π interactions in addition to enhanced planarity of the backbone in the solid state compared to in solution.
The β-sheet-like backbone arrangement of the peptide in the solid state has been confirmed by Fourier transform infrared (FT-IR) spectroscopy.
Radical polymerization processes are compatible with many functional groups [5] and the alternating nature of the copolymerization enables precise placement of functionality into the copolymer backbones for study of the structure/property relationships of these novel sterically congested backbone polymers in both solution and the solid state.
The benzophenone segments in the backbone induce photocrosslinking upon UV irradiation in the solid state most probably by a hydrogen atom abstraction mechanism.
We attribute this red shift to an increase in conjugation due to planarization of the backbone and increased intermolecular π π interaction in the solid state.
29 Although the torsional twist observed for the BTI monomer in the solid state could potentially reduce the effective π-conjugation along the polymer backbone, we note that variable temperature NMR experiments show no sign of hindered rotational freedom of the flanking thiophene rings even at 183 K where kT is 1.5 kJ mol−1.
The experimental and theoretical studies of polythiophenes suggest that this discrepancy in the intensity ratios of the vibronic peaks in the solid-state spectra stem from differences in the extent of planarization of the π-conjugated backbone as well as differences in π π stacking interactions in the solid state due to the presence of the octyl side chains.
This finding suggests that the backbone conformation of PDPP2 does not change upon going from solution to the solid state because of the aforementioned steric effect.
This copolymer, designed to preserve the backbone planarity of polythiophenes and to prevent a close packing arrangement through the non-regioregular insertion of the bulky substituted monomer, shows high PL quantum yield in the solid state and in solution aggregates.
23 May 2003 The solid state of microelectronics research.
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