Synthesis of mono- and bis-tetrazolato complexes of Ni(II), Pt(II) and Cu(II) via 1,3-dipolar cycloadditions of 2-cyanopyridines with metal ligated azides in N,N,O-aminoiminophenolato complexes.
Reactions of the aminoiminophenols 2-((2-(dimethylamino)ethylimino)methyl)phenol (HL(1)) or 2-{(3-(dimethylamino)propylimino)methyl}phenol (HL(2)) with nickel(II) chloride, K(2)[PtCl(4)] or copper(II) acetate in alcoholic solution, in the absence or in the presence of sodium azide, afford the corresponding new mononuclear complexes [M(L(1))(X)(H(2)O)(n)] [M = Ni, X = Cl(-), n = 2 (); M = Ni, X = N(3)(-), n = 0 (); M = Pt, X = Cl(-) () or N(3)(-) (), n = 0] or the known dinuclear compound [Cu(L(2))(N(3))](2) (). Complexes , and react with 2-cyanopyridine leading to the [2 + 3] cycloaddition products with 5-(2-pyridyl)tetrazolato [PTZ = N(4)C(2-NC(5)H(4))] ligands [Ni(L(1))(PTZ)](2) (), [Pt(L(1))(PTZ)] () and [Cu(PTZ)(2)(H(2)O)(2)] . The obtained complexes were characterized by IR, (1)H and (13)C (for , and ) NMR spectroscopies, elemental analyses and single crystal X-ray diffraction analyses (for , , , , and ). Complexes and form finite 1D chains and 3D frameworks, respectively, on account of extensive hydrogen bonds involving their coordinated water molecules and the chloride ligand (in the case of ) or tetrazolato nitrogen atoms (in the case of ).
Mukhopadhyay
Bhaswati Ghosh
BG
Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal.
Mukhopadhyay
Suman
S
Guedes da Silva
M Fátima C
MF
Charmier
M Adília Januário
MA
Pombeiro
Armando J L
AJ