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In this paper we described one pot synthetic pathways which generated in situ three complexes which contain three different ligands: N,N,N-tris(3,5-dimethylpyrazolylmethyl)amine (L1), urotropine (L2) and 3,5-dimethylpyrazole (L3).

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Complexes of Ni(II) and Co(II) of the formulae [Ni(H 2 O) 4 (pht) 2 ] (1) and [Co(H 2 O) 4 (pht) 2 ]Á1,5NH 3 ÁH 2 O (2) (where pht = phenotoinate anion) were obtained and characterized physicochemically. [Ni(H 2 O) 4 (pht) 2 ](1) crystallizes in a monoclinic space group P2 1 /c; a = 11.7358(8), b = 11,1250(8), 11.4182(7) Å ; b = 97.076(5)°; V = 1479.41 Å 3 ; Z = 2. The environment around the nickel and cobalt ions can be described as a distorted octahedron. The metal ion was found to bind to four water molecules and two nitrogen atoms derived from two anions of the monodentate phenytoinate. Four intramolecular hydrogen bonds designated as S(6) graph set are found in one [Ni(H 2 O) 4 (pht) 2 ] (1) molecule. Two chain HB patterns, constructed by the [Ni(H 2 O) 4 (pht) 2 ] molecules extending along the c and b axes, respectively, have been observed. The cobalt complex precipitates with the additional solvent molecules: one and a half of ammonia and one water. The results document the preferential binding of hydantoins to the metal ions through N(3) atom.

The novel complex [Co(L)Cl] 2 [CdI 4 ] obtained in situ from the redox system (Co 0 , CdCl 2 , NH 4 I, 1-hydroxymethyl-3,5-dimethylpyrazole) was characterized by X-ray diffraction IR, UV-VIS as well as magnetic and thermal investigations. The ligand, tris(1-(3,5-dimethylpyrazolylmethyl)amine (L) was synthesized in situ as a product of condensation 1-hydroxymethyl-3,5-dimethylpyrazole and ammonia molecule formed during redox process. The crystal structure of 1 includes in the unit cell two chemically identical but symmetry-independent cations: [Co(1)(L)Cl] ? and [Co(2)(L)Cl] ? . Each of the [Co(L)Cl] ? complex ions has C 3 point group symmetry, but the point group symmetry of the trigonal bipyramidal coordination spheres of [CoN 3 N 0 Cl] and tetrahedral sphere of [CdI 4 ] has C 3v point group symmetry.