Tripod ligands / Hydrazines, substituted / Diazenes / Cobalt(III), fivefold coordination of / Cobalt(II), fivefold coordination of Reactions of the Tripod-Co-Template CH,C(CH,PPh,),Co(II) with Functionalized Hydrazines
The coordination behaviour of ligands having the same basic EtOOCN=NCOOEt as the ligand. In the mononuclear comconstitution RN=NC(=X)R' (X = 0, N R , S) in their tripod pound, with only one nitrogen and one carbonyl oxygen of cobalt derivatives has been analyzed. The ligands themsel-the ligand acting as donor groups, the neutral ligand is coorves may be considered as neutral heterodiene compounds dinated to give the high-spin cobalt(I1) species tripod and are in this respect vlnylogues to diazenes RN=NR'. Two-(EtO)CN=N-~0OEt2@ (8). In the dinuclear compound 9 electron reduction of these neutral species results in di-with both of the nitrogen atoms and carbonyl groups involanionic heterosubstituted heteroolefms RN--N=C(X-)R'.
ved in coordination the dianionic ligand bridges two high-Due to their redox ambiguity the oxidation state of the metal spin cobalt(I1) centers to give tripod
as a derivabve with two fused five-membeevident. Compounds tripodCo=N(H)=N=qX)-R'@ 15: X, red chelate rings. In addition to the conventional analytical R' = 0, Ph; 6: (X, R') = (py); 7: X, R' = S, NHz] are best desc-techniques X-ray structure analyses, cyclovoltametric nbed as containing low-spin Co(II1) and dianionic ligands. measurements, magnetic susceptibility and ESR data are Co(I1) species are obtained with diethyl azodicarboxylate used to characterize the compounds.