FINGERPRINTING PETROPORPHYRIN STRUCTURES WITH VIBRATIONAL SPECTROSCOPY. PART 6: RESONANCE RAMAN CHARACTERIZATION OF REGIOISOMERS OF NICKEL(II) BENZOETIOPORPHYRIN
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dc.contributor.author | Boggess J.M. | |
dc.contributor.author | Czernuszewicz R.S. | |
dc.contributor.author | Lash T.D. | |
dc.date.accessioned | 2021-04-20T03:35:24Z | |
dc.date.available | 2021-04-20T03:35:24Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1234694 | |
dc.identifier.citation | Organic Geochemistry, 2002, 33, 9, 1111-1126 | |
dc.identifier.issn | 0146-6380 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28194 | |
dc.description.abstract | Nickel(II) complexes of the geochemically significant four regioisomers of benzoetioporphyrin, Ni(BP-A-D), which contain a benzene ring fused onto the Cβ atoms of a pyrrole ring, have been synthesized and structurally characterized by resonance Raman spectroscopy. Laser excitations in resonance with the porphyrin Soret (406.7 nm) and Q (530.9 and 568.2 nm) electronic absorption bands exposed nearly all Raman active vibrations in the fingerprint region (100-1700 cm-1). The porphyrin skeletal vibrations above 1300 cm-1 are largely unaffected by the different location of the β,β-benzo exocyclic ring, but their frequencies indicate slightly more planar structures in solution for Ni(BP) porphyrins relative to nickel tetrahydrobenzo- and etioporphyrins. Several unique marker bands are also found for vibrations of the β,β-benzo substituent, especially in the Soret-band resonant spectra. Alkyl substituent and porphyrin skeletal vibrations in the low- (350-550 cm-1) and mid-frequency (750-1300 cm-1) regions show striking sensitivity to small conformational changes in the porphyrin, allowing the four Ni(BP) regioisomers to be readily distinguished. | |
dc.title | FINGERPRINTING PETROPORPHYRIN STRUCTURES WITH VIBRATIONAL SPECTROSCOPY. PART 6: RESONANCE RAMAN CHARACTERIZATION OF REGIOISOMERS OF NICKEL(II) BENZOETIOPORPHYRIN | |
dc.type | Статья |
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