1992
DOI: 10.1016/0166-1280(92)87013-p
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Ab initio studies on heterocyclic conjugated polymers: structure and vibrational spectra of thiophene, oligothiophenes and polythiophene

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Cited by 89 publications
(39 citation statements)
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“…The exception is the potential function describing the energy of torsion about the bond between two PT rings. This inter-ring torsion is known to be the most flexible degree of freedom among the polymer backbone atoms [35,34], and is the predominant determining factor for the polymer's conformational distribution in free-rotating gas and liquid phases [42]. In some cases, it has even been possible to predict oligomer structure solely from the potential of rotation about this bond [34].…”
Section: Force Field Atom Types and Parametersmentioning
confidence: 99%
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“…The exception is the potential function describing the energy of torsion about the bond between two PT rings. This inter-ring torsion is known to be the most flexible degree of freedom among the polymer backbone atoms [35,34], and is the predominant determining factor for the polymer's conformational distribution in free-rotating gas and liquid phases [42]. In some cases, it has even been possible to predict oligomer structure solely from the potential of rotation about this bond [34].…”
Section: Force Field Atom Types and Parametersmentioning
confidence: 99%
“…Only the nearly planar all-anti conformation was optimized for each pentamer, based on others' findings that bond lengths and other parameters do not significantly change in other near-minimum conformations [34]. A pentamer is expected to be more than sufficient to capture the geometry and electron structure of the general polymer, as previous ab initio studies have found that geometries do not change substantially once the length exceeds three rings [35,36]. Partial charges were then derived from the HF/6-31G* electrostatic potential grid using the restrained electrostatic potential (RESP) method and program of the AMBER suite [37].…”
Section: Geometry and Partial Chargesmentioning
confidence: 99%
“…3 and Table 3) shows bands at 1556 cm À1 (combination of intra-ring C5 5C and inter-ring C-C vibration), 1475 cm À1 (vibrations C-C, C-N), 1305 cm À1 (5 5C-N inplane vibration), 1186 cm À1 (charge dislocation), 1045 cm À1 (C-N), 918 cm À1 (C-H out-of-plane deformation), 790 C-H cm À1 (out-of-plane bending), 677 cm À1 C-H (outer bending) and 613 cm À1 (C-H in-plane vibration) [40,41].…”
Section: Ftir Studies Of Polypyrrole/mesoporous Materialsmentioning
confidence: 99%
“…Por ejemplo, se puede determinar los modos normales de vibración (frecuencia e intensidad) característicos de los espectroscopía i.r. [73][74][75][76] , las constantes de acoplamiento de E.P.R [77,78] , etc……”
Section: Análisis De Parámetrunclassified