51V ESE-ENDOR studies of oxovanadium(IV) complexes: investigation of the nuclear quadrupole interaction

Article Abstract:

Research was conducted to examine a structurally diverse series of oxovanadiium(IV) complexes using the technique of 51V electron spin echo-electron nuclear double resonance. 51V nuclear quadrupole coupling constants were calculated by a perturbation theory method. Results demonstrate that the nuclear quadrupole coupling constant is sensitive to ligands binding trans to the oxygen of the oxo bond.

Usage, Binding sites (Biochemistry), Active sites (Biochemistry), Electron paramagnetic resonance

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Pulsed EPR/ENDOR characterization of the Cu2+ surface site in photosynthetic bacterial reaction centers

Article Abstract:

Analogous structural features are observed for the Cu2+ surface site involved in modulating QA-1QB->QAQB-1 electron transfer in RCs from Rb. sphaeroides, Rb. capsulatus, and Blc. viridis. The findings indicate that Cu2+ has a different coordination environment from the crystallographically characterized Zn2+ and Cd2+ surface sites in Rb. sphaeroides RCs.

Science & research, Observations, Copper, Photosynthesis, Atomic properties

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Electronic structure of the aqueous vanadyl ion probed by 9 and 94 GHz EPR and pulsed ENDOR spectroscopies and density functional theory calculations

Article Abstract:

An investigation into the aqueous ion ([VO(H2O)5]2+) using X-band EPR, 94 GHz W-band EPR, and ESE_ENDOR is presented.

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