EPR Spectra of 2,2′-Bipyridide Ion

Veiga, J. dos Santos; Reynolds, Warren L.; Bolton, James R.

doi:10.1063/1.1727014

Cited by 26 publications

(3 citation statements)

References 5 publications

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“…In fluid solution, 2 + is close to EPR silent. This together with the unresolved EPR spectrum of the solid sample unfortunately precludes a more detailed analysis of the spin density distribution within the CHCH-bipy-CHCH bridge by comparing the 14 N or 1 H hyperfine splittings (hfs) to those of authentic bipy – radical anions. − Considering the rather small magnitudes of the hfs constants in bipy – , the additional 31 P and 99/101 Ru hfs expected in 2 + and the overall broadening of the EPR signal in the solid or the low intensity of the EPR signal in fluid solution it is, however, not wholly surprising to see only an unresolved EPR signal for that species.…”

Section: Resultsmentioning

confidence: 99%

Vinyl Ruthenium-Modified Biphenyl and 2,2′-Bipyridines

et al. 2015

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We report here on ruthenium alkenyl complexes 2 and 3 derived from 2,2'-bipyridine and their Re(CO)3X adducts 4a,b and 5. Detailed electrochemical studies on these complexes and spectroscopic characterization of their oxidized forms by IR, UV/vis/NIR, and electron paramagnetic resonance spectroscopies as well as quantum chemical studies reveal sizable (bridging) ligand contributions to the redox orbitals. Engagement of the free bipy functions of complexes 2 and 3 in binding to the electron-withdrawing fac-Re(CO)3X (X = Br, Cl) moiety enhances the metal-to-ligand charge-transfer character of the optical excitations, causes sizable anodic shifts of the redox potentials, and decreases the number of observable anodic redox waves by one when compared to complexes 2 and 3. Despite the decreasing electron density at the terminal or bridging alkenyl bipyridine ligand, the anodic redox processes still maintain appreciable ligand character as is seen by the shifts of the Ru(CO) and Re(CO)3 stretching frequencies on oxidation. Binding of the fac-Re(CO)3X moiety also attenuates the degree of ground-state delocalization in the mixed-valent states.

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Section: Resultsmentioning

confidence: 99%

Vinyl Ruthenium-Modified Biphenyl and 2,2′-Bipyridines

et al. 2015

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“…Henning,17 and Veiga et a1.,18 and those of [Mo(CO),_,(PBu,)(bipy)] -, reported by tom Dieck et al l 6…”

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confidence: 85%

Radical intermediates in the reductive isomerisation of octahedral manganese carbonyl bipyridyl complexes; electrochemistry, electron spin resonance spectroscopy and molecular-orbital calculations

Brown¹,

Carriedo²,

Connelly³

et al. 1994

J. Chem. Soc., Dalton Trans.

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“…4a). 98 Nakamura used UV/vis absorption spectroscopy to conclude on the nature of the obtained coordination compounds. 95 Both the properties of the solvent as well as the cation's size were found to impact the product distribution in solution.…”

Section: Terpyridine Complexes Of Alkalimetal Ions (Group 1)mentioning

confidence: 99%