manner as a "freer" radical resulting from outer-sphere reduction by a very reactive neutral or negative species. Recent pulse radiolytic experiments by Cohen and co-workers43 point to substantial differences. Reaction of complexes XIX and XXI with either C02'• or •€( 3)2 yielded the corresponding cobalt(III)-bound isonicotinoyl radicals, the decay of which (to Co2+) may be monitored. The radical from XXI, as expected, decays unimolecularly by internal electron transfer, but those from several other isonicotinoyl complexes, including that from XIX, react predominantly with the parent Co(III) complex in a bimolecular path, (11). No evidence for the latter path is evident in reduction of complex XIX by Eu(II).

Die trans‐ Titelkomplexe (II) werden ausgehend vom Tetrachloroxotechnetat(V) (I) durch sukzessive Umsetzung mit den Schiffschen Basen und mit einem Überschuß der gleichzeitig reduzierend wirkenden, tert. Phosphine gebildet und als Hexafluorophosphate isoliert.

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The dication [Ni(meso-L1)I2+, (11, [the NIl complex of the meso diastereoisomer of the ligand 1,3-bis((oaminophenyl)phenylphosphino}propane, rneso-Ll] on deprotonation gives the neutral complex, [Ni(meso-L1 -2H)],(2), with a cis-disposition of the two amido groups which undergo facile alkylation with propane-l,3-ditoluene-psulphonate to give [Ni(Lz-2H)], (3), a complex of the new P2N2 macrocycle meso-L2; X-ray structure analyses of the nitrate salt of (l), LZ, and (3) confirm the meso-configuration of the ligands.