Nickel complexes aminopyridine

The nickel complexes with 2-aminopyridines bear some similarity to complexes of the corresponding aliphatic diamines (Section 50.5.3.2). Most of the complexes are easily obtained by the direct reaction of nickel(II) salts with the appropriate amount of the diamine in ethanol solution. Complexes with JV-substituted aminopyridines are preferably synthesized under anhydrous conditions. 

Selected examples of nickel(II) complexes with bidentate aminopyridines and related ligands are shown in Table 49. 

The Ni-Gu distance of 3.171(4) A is too long for significant metal-metal interaction. " Main group-metal-nickel heterodinuclear complexes have been prepared by the reactions of aluminum pnictines such as (4-dimethyl-aminopyridine)Al(Me)2E(TMS)2 (E = P, As, Sb) with Ni(GO)4. Grystal structures reveal open structures with the pnictinogen atom lone pair coordinated to Ni(GO)3 fragments. A series of bis-(trimethylsilyl)ethynyl-< / .y< -titanocenes... 

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