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Volumn 104, Issue 46, 2000, Pages 10885-10899

Calculation of the vibrational spectra of linear tetrapyrroles. 2. Resonance Raman spectra of hexamethylpyrromethene monomers

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION SPECTROSCOPY; DIMERS; ELECTRON TRANSITIONS; GROUND STATE; HYDROGEN BONDS; MOLECULAR VIBRATIONS; MONOMERS; OPTIMIZATION; QUANTUM THEORY; RAMAN SPECTROSCOPY; RESONANCE;

EID: 17444453636     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp000444h     Document Type: Article
Times cited : (27)

References (80)
  • 63
    • 33645911925 scopus 로고    scopus 로고
    • Calculations with larger basis sets such as 6-31++G**, 6-31++G*, or 6-311++G** could not be completed with GAUSSIAN98 as the largest MO coefficient eventually exceeds the computational threshold of the program. Large coefficients arise for those unoccupied orbitals with strong contributions of diffuse basis functions. These orbitals have Rydberg characteristics and are of highly oscillatory form because of the orthogonality constraint to the manifold of lower lying orbitals.
    • Calculations with larger basis sets such as 6-31++G**, 6-31++G*, or 6-311++G** could not be completed with GAUSSIAN98 as the largest MO coefficient eventually exceeds the computational threshold of the program. Large coefficients arise for those unoccupied orbitals with strong contributions of diffuse basis functions. These orbitals have Rydberg characteristics and are of highly oscillatory form because of the orthogonality constraint to the manifold of lower lying orbitals.
  • 66
    • 33645913074 scopus 로고    scopus 로고
    • Since the HOMO and LUMO are localized in different parts of the molecule, i.e., in the pyrrolic ring and in the pyrroleninic ring and methine bridge, respectively, the transition moment and, hence, the oscillator strength are large for the HOMO -LUMO transition.
    • Since the HOMO and LUMO are localized in different parts of the molecule, i.e., in the pyrrolic ring and in the pyrroleninic ring and methine bridge, respectively, the transition moment and, hence, the oscillator strength are large for the HOMO -LUMO transition.
  • 67
    • 33645911328 scopus 로고    scopus 로고
    • Compared to the B3LYP MOs, the BP86 MOs are raised in energy, however, the shifts are more pronounced for the HOMO -1 and HOMO - 2 compared to the HOMO so that the energy differences between these orbitals are reduced, which in turn may promote mixing of these MOs in the excited states.
    • Compared to the B3LYP MOs, the BP86 MOs are raised in energy, however, the shifts are more pronounced for the HOMO -1 and HOMO - 2 compared to the HOMO so that the energy differences between these orbitals are reduced, which in turn may promote mixing of these MOs in the excited states.
  • 68
    • 33645941928 scopus 로고    scopus 로고
    • For the HF/6-31G* ground state geometry HOMO-2 and HOMO-1 are inverted compared to B3LYP, BP86, and CNDO/S calculations based on the B3LYP/6-31G* geometry.
    • For the HF/6-31G* ground state geometry HOMO-2 and HOMO-1 are inverted compared to B3LYP, BP86, and CNDO/S calculations based on the B3LYP/6-31G* geometry.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.