SÍNTESE, CARACTERIZAÇÃO E CRISTALOQUÍMICA DE COMPLEXOS DA COBRE(I) E MERCÚRIO(II) COM LIGANTES TRIAZENIDOS / SYNTHESIS, CHARACTERIZATION AND CRYSTALCHEMISTRY OF COPPER(I) AND MERCURY(II) COMPLEXES WITH TRIAZENIDO LIGANDS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The reaction between mercury(II) acetate and 1-(3-nitrophenyl)-3-(2-fluorophenyl)triazene in a tetrahydrofuran/methanol mixture in the presence of 2,2′-bipiridylamine yields the complex [Hg(FC6H4NNNC6H4NO2)2] (1). (1) crystallizes in the triclinic crystal system, space group P(-1), with the crystal data a = 6,8318(10) Å, b = 8,271(3) Å, c = 11,3111(7) Å, α = 72,249(16), β = 87,133(9) e γ = 79,979(17), V = 599,4(2) Å, Z = 2, R1 = 0,0258 and wR2 = 0,0637. The mononuclear complex presents two deprotonated 1-(3-nitrophenyl)-3- (2-fluorophenyl)triazenido monodentate ligands linear coordinated to Hg(II). The crystal structure is characterized by chains of molecules of (1) along the crystallographic direction [100] as result from intermolecular metal-arene π interactions. The reaction between tetrakis(triphenylphosphine)copper(I) chloride and 1,3- bis(4-nitrophenyl)triazene previously deprotonated with metallic sodium in methanol yields the complex [Cu(NO2C6H4N-NNC6H4NO2)(PPh3)2] (2). (2) crystallizes in the monoclinic crystal system, space group P21/c, with the crystal data a = 15,8852(3) Å, b = 11,9539(3) Å, c = 23,2094 Å, β = 94,6460(10), V = 4392,75(18) Å, Z = 4, R1 = 0,0446 and wR2 = 0,1089. The crystal structure of (2) is built by discrete mononuclear complexes in which the Cu(I) ion presents a distorted tetrahedral coordination geometry. One deprotonated 1,3-bis(4-nitrophenyl)triazenide ion act as a bidentate ligand, while two neutral triphenilphosphine molecules completes the coordination sphere of the metal ion. The crystal structure reveals molecules of (2) related by an axial c-glide plane and by an axial 21-two-fold screw axis resulting chains along the [001] and [010] directions via intermolecular C−H...O no classic hydrogen bonds. Beside the single crystal structure analysis, both the complexes (1) and (2) were also characterized by melting point determination and infrared spectroscopy.

ASSUNTO(S)

química mercúrio química inorgânica compostos triazenos cobre quimica

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