Síntese e Caracterização por Difração de Raios X em Monocristal do Complexo de Níquel(II) com Ligante Triazenido 1-Óxido e Estudo da Capacidade Fluorescente de Compostos Triazenos 1-Óxido.

Abstract

This work show the determination of the crystalline structure of nickel(II) complex with triazenide 1-oxide (3) as ligand, and the fluorescence study between two triazenes 1-oxide compounds, 1-methyl-3-(p-carboxyphenyl) triazene 1-oxide (1) and 1-methyl- 3-(phenyl) triazene 1-oxide (2). The nickel complex with triazenide 1-oxide (3) as ligand, {[(CH3NNNOC6H5COO)2NiII]∙[NiII(H2O)6]∙[DMF]∙[H2O]}, crystallized in the monoclinic system, group P21/n, with cell parameters a = 7.1834(2) Å; b = 10.0110(3) Å; c = 4.0393(12) Å; β = 93.658(2)°; V = 2873.48(15) Å3; Z = 4. The structure refinement indicated disagreement indices of R1 = 0.0412, wR2 = 0.0945. The center of the structure (3) is formed with two nickel atoms, with occupancy of 50% each, and each Ni(II) make two bounds with bidentade ligand (1) and the other two bounds are generated by symmetry. This anionic compound (3) is established with hexaaquanickel(II) and there are two neutral molecules of solvate of crystallization, a water molecule and a dimethylformamide molecule. The coumpond (3) has a threedimensional arrangement, formated by classic hydrogen bonds O-H···O. The spectroscopy studies to determine the fluorescence capacity were performed with 1-methyl-3-(p-carboxyphenyl)triazene 1-oxide (1) e 1-methyl-3-(phenyl)triazene 1-oxide (2). The presence of p-carboxylic group in the compound (1), as a polarity and viscosity of the used solvents showed influence about the fluorescence capacity of these compounds. Through the experimental data, it can be concluded that compound (2) have a bigger fluorescence capacity than compound (1).