Portal de Periódicos da CAPES

Cobalt(II) and nickel(II) complex with N,N,N′-trimethylated and triethylated alkylenediamines

1969; Elsevier BV; Volume: 3; Linguagem: Inglês

10.1016/s0020-1693(00)92531-3

1873-3255

Fabrizio Mani, Ivano Bertini,

Organometallic Complex Synthesis and Catalysis

The ligands N,N,N′-trimethylethylenediamine (Me3en), N,N,N′-triethylethylenediamine (Et3en), N,N,N′-trimethyltrimethylenediamine (Me3tn) form 1:1 adducts with cobalt(II) and nickel(II) halides having the general formulas N(Me3tn)X2, M(Et3en)X2 and Ni(Me3en)X2 (M = Co, Ni; X = Cl, Br, I). Adducts with a metal to ligand ratio of 1:2, M(Me3en)2X2, are also obtained with the ligand Me3en and they have a distorted octahedral structure. The M(Me3tn)X2 and M(Et3en)X2 complexes are pseudotetrahedral with the exception of Ni(Me3tn)Cl2 and Ni(Et3)Cl2 which have a polymeric octahedral structure as do Ni(Me3en)X2. The cobalt(II) and nickel(II) octahedral complexes, in solution give rise to temperature dependent equilibria between octahedral and pseudotetrahedral species.