Síntese e caracterização de um ligante bisfenilfosfinato rígido e novos compostos poliméricos

Abstract

In this work, the ammonium salt of acid and a new polymeric compound of Cadmium, ligand 1,4-phenylene bis phenylphosphinic acid already reported by Herring at 1967 (Herring, L., D.; United States Patent, 3, 341-576, 1967) were synthesized and characterized. The reaction between an organometallic and a protector group aminephosphine gave rise to a diaminphenylphosphine which was subsequently oxided generating a white powder 1,4-phenylene bis phenylphosphinic acid. Acid when submitted at solvothermics conditions of methanol, led to colorless needle shaped crystals of 1. The dissolution of phenylene 1,4-phenylphosphinic acid in alcoholic medium followed by slow evaporation of the solvent generated needle-shaped crystals 2. The reaction between the ammonium salt of the acid in ethanol and cadmium chloride originated under conditions solvothermic colorless crystals plate-shaped to a compound of cadmium 3. Three compounds were first analyzed by infrared spectroscopy. Thermogravimetric analysis was performed for compound 1. Compounds 1, 2 and 3 were analyzed by X-ray diffraction of single crystal. Compound 1 is presented in the form of a two-dimensional network formed by hydrogen bonds, from strong to moderate, forming chains along the direction [010]. Compound 2 presents a rare two-dimensional array consisting of ammonium and hydronium. Structure is arranged by a complex network based on hydrogen bonds, with growth in the directions of a and b, being made available by alternating organic and inorganic layers. The coordination polymer 3 is two-dimensional and stretches along the [100], by double ligand bridges bisphenylphosphinate. Along [010], chains are connected by bridges of simple ligand, also occur in this direction, weak hydrogen bonds between-OH groups of ligands and deprotonated oxygen atoms of the protonated ligands. Each oxygen of the ligand connects so bismonodentate the cadmium atoms that exhibit octahedral geometry. Hydrogen bonds in these three compounds were important in maintaining their solid state structures.