Dependence of magneto-optical rotatory dispersion and magnetic circular dichroism of deoxy- and methemoglobin on their quaternary structure

Sharonov, Yurii A.; Sharonova, N. A.; Атанасов, Б.

doi:10.1016/0005-2795(76)90234-8

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…The MORD of deoxyHb is particularly sensitive to tertiary structure changes at the heme that accompany a change in the quaternary state. There is a >50% increase in the magnitude of the 585 nm band for the T state compared with R state (61,62). The presence in Mb of an out-of-heme iron displacement and proximal histidine motion paralleling that seen in Hb should thus have a pronounced effect on the MORD.…”

Section: Discussionmentioning

confidence: 92%

Spectroscopic Evidence for Nanosecond Protein Relaxation after Photodissociation of Myoglobin−CO

et al. 1998

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Nanosecond time-resolved absorption and magnetic optical rotatory dispersion (MORD) measurements of photolyzed myoglobin-CO visible bands (500-650 nm) are presented. These measurements reveal a 400 ns process, spectrally distinct from ligand recombination, that accounts for 7% of the observed spectral evolution in the visible absorption bands and 4% in the MORD. The time-resolved MORD, more sensitive to heme coordination geometry than absorption, suggests that this process is most likely associated with protein relaxation on the distal side of the heme pocket, perhaps accompanying rehydration of the deoxymyoglobin photoproduct or accommodation of protein side chains to ligand escape.

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Section: Discussionmentioning

confidence: 92%

Spectroscopic Evidence for Nanosecond Protein Relaxation after Photodissociation of Myoglobin−CO

et al. 1998

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“…Based on the brief descriptions above, Faraday A-terms may be the most facile to engineer within materials as they simply require an intense electronic transition with a degenerate excited state, the latter of which is a direct consequence of molecular structure. The electronic structure and MCD spectra of highly symmetric metalloporphyrins have been well studied, but there are few papers describing their MORD activity, [26][27][28][29][30][31][32] or their use as magneto-optical polarization modulators. 15 The Gouterman four-orbital model simply describes the complicated electronic structure of porphyrins primarily through the interactions of two closely-spaced (nearly degenerate) a1u and a2u HOMO orbitals and a degenerate eg LUMO set.…”

Section: H 𝑓Jmentioning

confidence: 99%

Electron Withdrawing meso-Substituents Turn-on Magneto-Optical Activity in Porphyrins

Turner,

Pham,

Smith

et al. 2023

Preprint

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A series of square planar metalloporphyrins (M(TPP), TPP is 5,10,15,20-tetraphenylporphyrin and M(TPFPP), TPFPP is 5,10,15,20-tetrapentafluorophenylporphyrin; M is Zn2+, Ni2+, Pd2+, or Pt2+) with distinct meso-substituents were prepared and their Magneto-Optical Activity (MOA) was characterized by magnetic circular di-chroism (MCD) and Magneto-Optical Rotary Dis-persion spectroscopy (MORD; also known as Fara-day Rotation spectroscopy). MOA is crucial in the development of next generation magneto-optical devices and quantum computing. The data show that the presence of meso-pentafluorophenyl sub-stituents results in significant increase in MOA in comparison to the homologous phenyl group. Dif-ferences in the MOA of these metalloporphyrins are rationalized using the Gouterman four-orbital mod-el and pave the way for rational design of im-proved and tailorable magneto-optical materials

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“…Based on the brief descriptions above, Faraday A-terms may be the most facile to engineer within materials as they simply require an intense electronic transition with a degenerate excited state, the latter of which is a direct consequence of molecular structure. The electronic structure and MCD spectra of highly symmetric metalloporphyrins have been well studied, but there are few papers describing their MORD activity, − or their use as magneto-optical polarization modulators . The Gouterman four-orbital model simply describes the complicated electronic structure of porphyrins primarily through the interactions of two closely spaced (nearly degenerate) a 1u and a 2u HOMO orbitals and a degenerate e g LUMO set. − Due to this degeneracy, we questioned if metalloporphyrins might be good candidates for next-generation polarization modulation materials.…”

Section: Introductionmentioning

confidence: 99%

Electron-Withdrawing meso-Substituents Turn On Magneto-Optical Activity in Porphyrins

Turner,

Pham,

Smith

et al. 2024

Inorg. Chem.

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A series of square planar metalloporphyrins (M(TPP), TPP is 5,10,15,20-tetraphenylporphyrin and M(TPFPP), TPFPP is 5,10,15,20tetrapentafluorophenylporphyrin; M is Zn 2+ , Ni 2+ , Pd 2+ , or Pt 2+ ) with distinct meso-substituents were prepared, and their magneto-optical activity (MOA) was characterized by magnetic circular dichroism (MCD) and magnetooptical rotary dispersion spectroscopy (MORD; also known as Faraday rotation spectroscopy). MOA is crucial in the development of next-generation magneto-optical devices and quantum computing. The data show that the presence of meso-pentafluorophenyl substituents results in significant increase in MOA in comparison to the homologous phenyl group. Differences in the MOA of these metalloporphyrins are rationalized using the Gouterman fourorbital model and pave the way for rational design of improved and tailorable magneto-optical materials. Z 0 (1a)

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Dependence of magneto-optical rotatory dispersion and magnetic circular dichroism of deoxy- and methemoglobin on their quaternary structure

Cited by 8 publications

References 35 publications

Spectroscopic Evidence for Nanosecond Protein Relaxation after Photodissociation of Myoglobin−CO

Spectroscopic Evidence for Nanosecond Protein Relaxation after Photodissociation of Myoglobin−CO

Electron Withdrawing meso-Substituents Turn-on Magneto-Optical Activity in Porphyrins

Electron-Withdrawing meso-Substituents Turn On Magneto-Optical Activity in Porphyrins

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