[Ni(2,4'-bipyridine)2(dichloroacetate)2]*2H2O

[Ni(6-hydroxymethylpyridine-2-carboxylic acid methyl ester)Cl2]*H2O

[Ni(1-(4,6-dimethyl-pyrimidin-2-ylazo)-naphthalen-2-ol(1-))(AcO)(EtOH)3]H2O

[Ni(1-(4,6-dimethyl-pyrimidin-2-ylazo)-naphthalen-2-ol(1-))2(EtOH)2]H2O