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Die in der vorangegangenen Arbeit (vergleiche vorstehendes Referat) entwickelte allgemeine Theorie wird auf 72 gesättigte Alkylketone unterschiedlichster Art (trans‐Decalone‐(2), Cyclobutanone, acyclische Ketone, Cyclopentanone, Cyclohexanone, verbrückte Ketone) angewendet.

following paper in this issue.(11) For simplicity we consider only nondegenerate transitions. The magnetooptical A and C terms, which can be nonzero if the transition is degenerate, have the same symmetry properties as the B terms. Extension of the present theory to include degeneracies is therefore straightforward. (12) P.

range of solvent effects and demonstrate that back-bonding from ruthenium(II) can indeed increase electron density at remote ligand sites. The protonated species, as well as the Co(III) and Rh(III) complexes, manifest significant charge withdrawal. The 7-carbon resonances are much larger than solvent effects and indicate electron density depletion in the order H+ > Co(III) > Rh(III) and increase with Ru(II) > Fe(II).The effect of substituents indicates that the extent of charge delocalization by x back-bonding is greatest for the ligand which is most depleted in electron density. Thus, one expects that fV-methylpyrazinium and the pyrazinium ion would be more stabilized than pyrazine by the x back-bonding of pentaammineruthenium(II), as found by Malin et al. for the corresponding pentacyanoferrate(II) complexes,4 supporting an earlier conclusion2 that the most important factor in causing the increased basicity of pyrazine when it is complexed to Ru(II) is the stabilization of the protonated pyrazine by the ruthenium center.

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