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High‐frequency vibrational mode characterization of Zn(II), Ni(II) and Co(II) tetraphenylchlorins
Author(s) -
Song OkKeun,
Ha JongSeo,
Yoon Minjoong,
Kim Dongho
Publication year - 1990
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250211004
Subject(s) - raman spectroscopy , chemistry , raman scattering , excitation , molecular vibration , resonance (particle physics) , analytical chemistry (journal) , x ray raman scattering , molecular physics , coherent anti stokes raman spectroscopy , normal mode , atomic physics , physics , optics , vibration , quantum mechanics , chromatography
The detailed resonance Raman spectra of metallotetraphenylchlorins with B , Q x and Q y excitations and excitation profiles of Raman modes on the Q y absorption band have been reported. In metallotetraphenylchlorins, the character of the vibrational eigenvector and the localization of the modes in the pyrrole rings raised by the symmetry are different from those of metallooctaethychlorins. A recent normal mode calculation on Cu(II) tetraphenlchlorin based on the semi‐empirical quantam chemistry force field (QCFF/PI) method was utilized to elucidate the vibrational mode assignment of Zn(II), Ni(II) and Co(II) tetraphenylchlorins. For Raman excitation profiles on Q y (O, O) and Q y (O, 1) absorption bands, it is observed that some polarized Raman bands have contributions not only from A ‐term scattering but from Herzberg‐Teller scattering. This can be explained by the symmetry lowering and the localized normal mode character of metallotetraphenylchlorins. For depolarized and anomalously polarized Raman bands, the vibronic coupling (interstate mixing) is strongly introduced.