4 -Phenyl-2,2 :6 ,2"-terpyridine, complexes with

Fig. 8. The crystal and molecular structure of 4 -phenyl-2,2 6, 2"-terpyridine (a) and its bis complex with nickel(II) (b) 129).

The spin state of iron(II) in substituted 2,2 6, 2"-terpyridine, (72), complexes depends on the position of bulky substituents—phenyl substituents in both the 6 and 6" positions give a high-spin complex phenyl substituents in the 4 and 6 positions give a complex which exists both in high-spin and in low-spin forms. Crystal structure determinations gave Fe—N bond distances in both forms of the 4,6-diphenyl complex and of the 6,6"-diphenyl complex. Each ligand in the latter com )lex has one terminal pyridine very weakly bonded to the iron, with... 

A wide-ranging study of several cyclometallated analogs of platinum(ii) terpyridine/chloro complexes has been undertaken.Crystal structures were determined, and substitution kinetics experiments in methanol were conducted. The nucleophiles Br and Gl were employed, and in two cases, [Pt(N-N-C)Cl] and [Pt(N-G-N)Gl], substitution kinetics with TU, DMTU, and TMTU were measured. N-N-CH is 6-phenyl-2,2 -bipyridine, N-CH-N is l,3-di(2-pyridyl)benzene, TU is thiourea, and DMTU and TMTU are the dimethyl and tetramethyl analogs of TU. The complexes are schematically represented below 5. 

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