No abstract

No abstract

484Azopyrazolones are used most widely as dyes for textiles and other materials, in the analytical chemis try of metals, and as medical drugs [1]. The introduc tion of metal cations into the azopyrazolone dye mol ecule often changes the color grade and gives rise to additional physicochemical properties. For example, the introduction of copper or silver cations can impart antibacterial or fungicidal properties to the colored textiles, which is useful for the medical and restoration applications [2].Although metal containing azopyrazolone dyes have been used for many decades, due to difficulty of isolation of the single crystals of these compounds, only a few studies are devoted to the crystal structures of transition and main group metal (M = Cu, Cr, Zn, Co, Ni, Sn) complexes with 1 phenyl 3 methyl 4 azopyrazol 5 one derivatives [3][4][5][6].The purpose of the present study is to isolate and to establish the composition and structure of copper(II) complexes with some 1 phenyl 3 methyl 4 azopyra zol 5 one derivatives (H m L n ; m = 1-3, n = 1-7): EXPERIMENTALCompounds I-VII (copper(II) complexes with Н m L n ; m = 1-3, n = 1-7) were synthesized by slow mixing of equal volumes of equimolar ethanol solu tions of the initial ligands and metal chlorides with heating for 3 h. On quick chilling, precipitation R 1 Abstract-Seven new copper(II) complexes with 1 phenyl 3 methyl 4 azopyrazol 5 one were synthesized and isolated in the crystalline state. The crystal and molecular structure of the complex Cu(C 17 H 15 N 4 O) 2 ⋅ 0.222H 2 O was studied by X ray diffraction. The organic ligand is coordinated to copper in the anionic form in the bidentate chelating mode through the oxygen atom of the pyrazolone moiety and one nitrogen atom of the azo group. As a first approximation, the copper(II) coordination polyhedron (CP) is a tetrahedrally dis torted square. The copper CP is completed to an extended tetragonal pyramid (4+1) by the Cu⋅⋅⋅N(1) contact (3.072 Å) with the pyrazole nitrogen of the neighboring molecule.