Substituent dependency in pentaamminemetal(II) complexes (M = Ru, Os) of styrenes probed by using carbon-13 nuclear magnetic resonance spectroscopic method and voltammetrical analysis

Lin, Shaw‐Tao; Jong, J. G. de

doi:10.1139/v94-248

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“…Particular attention was paid to the possibility that ruthenium fixation might have involved the outer double bond. This eventuality appears excluded by the 1 H NMR data (fixation on the double bond would have shifted the H 1 signal upfield by 3 ppm) and by infrared spectroscopy (the nitrile frequency is modified and no free nitrile is observed; taking into account the stoichiometry, this leaves no possibility for an extra ruthenium).…”

Section: Resultsmentioning

confidence: 99%

Electron Transfer through Norbornadiene and Quadricyclane Moieties as a Model for Molecular Switching

et al. 1996

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The bis(pentaammineruthenium(II)) complex of dicyanonorbornadiene has been prepared and characterized. Its photochemical conversion into a dicyanoquadricyclane complex by irradiation in methanol has been followed by UV−visible spectroscopy, IR spectroscopy, 1H NMR spectroscopy, and cyclic voltammetry. The dicyanonorbornadiene complex exhibits an intervalence transition in the 1000−1600 nm range when oxidized to the ruthenium(II)−ruthenium(III) state. This allows the determination of the effective coupling V ab through the dicyanonorbornadiene ligand, which is found as 0.023 eV. No such band is observed in the case of the dicyanoquadricyclane complex. These results show the possibility to modulate an intramolecular electron transfer process by using a photoisomerizable bridging ligand.

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Section: Resultsmentioning

confidence: 99%