Add time:08/08/2019         Source:sciencedirect.com

The energies of the 2E state in hexaammine-cobalt(II) and related complexes are estimated, and implications for the electron self-exchange reactions are discussed. Solution spectra of [Co(NH3)6]2+ and [Co(en)3]2+ are presented, and analysis of these and related spectra permits confident assignment of the energies of the 4T1g, 2T1g, 2T2g, 2T1g and 4T1g states. A ligand-field treatment leads to an estimate of the energy of the spectroscopic 2E state in [Co-(NH3)6]2+ at approximately 6800 cm−1 above the ground state. For the 2E/1A pathway to have reorganizational energy dose to that of the groundstate pathway, the octahedral 2E state would have to have a minimum-energy bond length of 2.08 Å. It is concluded that the 2E pathway probably lies near or slightly above the 4T pathway in activation energy, and that the two paths cannot be readily distinguished.

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