Resonance Raman spectra of oxyen adducts of cobalt porphyrins. Enhancement of solvent and solute bands via resonance vibrational coupling

Kincaid, James R.; Proniewicz, Leonard M.; Bajdor, Krzysztof; Bruha, Alan; Nakamoto, Kazuo

doi:10.1021/ja00310a005

Cited by 36 publications

(23 citation statements)

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“…This effect has been quantitatively demonstrated by Nakamoto and co-workers for a series of Co(TPP)(base)(O 2 ) complexes, where the ν(O 2 ) frequency decreases linearly as the pK a of the base increases. [20] It is also worth noting that in the Raman spectra of the six-coordinate (O 2 )Co(TPP)(B) complexes (where B is a nitrogen base), the ν(O 2 ) bands are observed in the vicinity of 1160 cm…”

Section: Resultsmentioning

confidence: 99%

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IR Study of the Interaction of Dioxygen with [meso‐Triphenyl(4‐pyridyl)porphyrinato]cobalt(II)

et al. 2003

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The interaction of O 2 (18 O 2 ) with [meso-triphenyl(4-pyridyl)-porphyrinato]cobalt(II) [Co(MPyTPP)] has been investigated by means of IR spectroscopy under matrix-isolation conditions and by the action of dioxygen on thin sublimed layers. These studies have led to the characterisation of two dioxygen adducts: (1) a very unstable dioxygen adduct similar to that observed earlier for the closely related [mesotetraphenylporphyrinato]cobalt(II) Co(TPP), and (2) a new type of coordinated O 2 ( 18 O 2 ) complex which is formed after warming Co(MPyTPP) either in pure oxygen matrices, or as sublimed layers in the presence of oxygen. The ν(O 2 ) vibration in this second species is more than 100 cm −1 lower than

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Section: Resultsmentioning

confidence: 99%

“…[20] The ability of Co-meso-aryl-substituted porphyrins to bind dioxygen is inherent not only for the isolated molecules (i.e. matrix-isolated or solvated molecules) but is also found in the layers obtained by sublimation onto a lowtemperature (77 K) substrate.…”

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confidence: 99%

IR Study of the Interaction of Dioxygen with [meso‐Triphenyl(4‐pyridyl)porphyrinato]cobalt(II)

et al. 2003

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“…There is also a nodal line in the ω 2 = 349 cm –1 coherence map in Figure S3, but this seems to be due to a lack of amplitude on the diagonal rather than destructive interference effects. In an attempt to understand these nodal features, we have considered possible solvent effects, including excitation of solvent vibrations via coordinated solvent ligands. , As a control study, we performed 2DES of BChla in ethanol, finding very similar results to the isopropanol studies, suggesting that solvent effects do not explain the observed nodal signature. The BChla in ethanol results are summarized in the SI along with additional discussion of deviations from the DO model.…”

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confidence: 99%

Characterization of Vibrational Coherence in Monomeric Bacteriochlorophyll a by Two-Dimensional Electronic Spectroscopy

Policht

Niedringhaus

Ogilvie

2018

J. Phys. Chem. Lett.

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Bacteriochlorophyll a (BChla) is the most abundant pigment found in the Bacterial Reaction Center (BRC) and light-harvesting proteins of photosynthetic purple and green bacteria. Recent two-dimensional electronic spectroscopy (2DES) studies of photosynthetic pigment–protein complexes including the BRC and the Fenna–Matthews–Olson (FMO) complex have shown oscillatory signals, or coherences, whose physical origin has been hotly debated. To better understand the observations of coherence in larger photosynthetic systems, it is important to carefully characterize the spectroscopic signatures of the monomeric pigments. Prior spectroscopic studies of BChla have differed significantly in their observations, with some studies reporting little to no coherence. Here we present evidence of strong coherences in monomeric BChla in isopropanol using 2DES at 77 K. We resolve many modes with frequencies that correspond well with known vibrational modes. We confirm their vibrational origin by comparing the 2D spectroscopic signatures with expectations based on a purely vibrational model.

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“…As an example, consider 1,3-disilacyclobutane: (31). The preceding phenomenon was first observed by Kincaid et al (37). 4-16.…”

Section: Applications To Structural Chemistrymentioning

confidence: 81%

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Ferraro

1994

Introductory Raman Spectroscopy

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Resonance Raman spectra of oxyen adducts of cobalt porphyrins. Enhancement of solvent and solute bands via resonance vibrational coupling

Cited by 36 publications

References 0 publications

IR Study of the Interaction of Dioxygen with [meso‐Triphenyl(4‐pyridyl)porphyrinato]cobalt(II)

IR Study of the Interaction of Dioxygen with [meso‐Triphenyl(4‐pyridyl)porphyrinato]cobalt(II)

Characterization of Vibrational Coherence in Monomeric Bacteriochlorophyll a by Two-Dimensional Electronic Spectroscopy

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