Ammine, Amine, and Related Ligands

Nickel(ii) Complexes.—Ammine, Amine, and Related Ligands. [Ni(NH3)g](l3)2 has been prepared by dissolving a nickel(ii) salt in aqueous ammonia and adding iodine and a five-fold excess of The reaction of hydrazine hydrate with 

Breckenridge, W. Warzecha, and T. Surles, Inorg. Nuclear Chem. Letters, 1973, 9, 437. 

Tsuchiya, S. Joba, A. Uehara, and E. Kyuno, Bull. Chem. Soc. Japan, 1973, 46, 1454. 

The complexes NiLX2(L = bipyorphen X = Cl or Br) have been prepared and [Ni(phen)3](xanthate)2 has been isolated from the reaction of potassium xanthate with NiC and phen in aqueous solution. D.t.a. studies on optically active [Ni(phen)3]X2 complexes show specific endothermic peaks in the cases of X = I or CIO4 which are attributed to the racemization process, and [Ni(phen)2X2] complexes have been isolated from the thermal decomposition of [Ni(phen)3X2] (X = Cl, Br, I, or SCN).  

The eight-co-ordinate complex [Ni(napy)4](C104)2 (napy = naphthapyri-dine) has been reported and its structure discussed in terms of distortion away from true dodecahedral stereochemistry. The octahedral complex [Ni(napy)2-(N03)2] has also been prepared.  

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