Complexes of bipositive metal ions from vanadium (II) to copper(II) with tris(3,5-dimethyl-1-pyrazolylethyl)amine

Abstract

Complexes of bipositive metal ions from vanadium(II) to copper(II) with tris(3,5-dimethyl-1-pyrazolyl-ethyl)amine Metal complexes of polypyrazolyl ligands have been found to provide significant examples of bioinorganic models [1]. As a part of a general investigation on this class of complexes [2], the study of compounds of the bipositive ions from vanadium(II) to copper(II) with the potentially tetradentate ligand tris(3,5-dimethyl-1-pyrazolylethyl)amine(TPy-EA) has been undertaken. ▪ t001 Some Representative Complexes of the Ligand TPyEA. μeff μB Coordination Geometry [V(NCS) 2 (TPyEA)] 3.81 octahedral [CrBr(TPyEA)] BPh 4·C 2H 5OH 4.83 trig. bipy ← square pyr. [MnBr (TPyEA) ] BPh 4· 0.5 CH 2 Cl 2 5.86 trigonal bipyramidal [ FeClTPyEA ] BPh 4· 0.5CH 2 Cl 2 5.50 trigonal bipyramidal [Co(NCS)(TPyEA)] BPh 4 4.43 trigonal bipyramidal [Co(TPyEA)] (BPh 4) 2 4.22 trigonal pyramidal [Co(TPyEA)] CoBr 4 4.48 trig. pyr. + tetrahed. [ NiBr(TPyEA,) ] BPh 4 3.26 trigonal bipyramidal [Cu(CIO 4)(TPyEA)] ClO 4 1.88 trig. bipy. ← square pyr.