Síntese e caracterização de triazenos e complexos com Hg(II) incluindo arranjos supramoleculares

Abstract

This work presents the synthesis of new compounds and their triazenes complexes of mercury(II). Triazenes have three nitrogen atoms connected in sequence [ N=N N(H) ] and, when deprotonated, they become good Lewis bases and work as excellent ligands in coordination chemistry. Varying the substituent groups bound to the terminal phenyl rings triazenes chain, using substituent groups such as: oxime, fluoro, acetyl, methoxy and nitro. The characterizations were performed with different techniques: x-ray diffraction on single crystal, thermogravimetric analysis (TGA), spectroscopy in the ultraviolet-visible, infrared and hydrogen nuclear magnetic resonance. The main goal this work is the structural characterization by x-ray diffraction of three pre-ligant and ten mercury(II) complexes, with emphasis on supramolecular architectures on solid state. The insertions of the substituent groups favored the formation of supramolecular structures via intermolecular bonds of different type, such as classic and non-classic hydrogen bonds, π stacking interactions, interactions arene C-H∙∙∙π interactions and metal-arene π. The pro-ligands were synthesized are: 1,3-bis(3-phenylacetophenone oxime)triazene; 1-(3-phenyl-acetophenone oxime)-3-(2-fluorophenyl)triazene; 1,3- bis(4-phenyl-acetophenone oxime)triazene; 1-(3-phenyl-acetophenone oxime)-3-(2-methoxy-4- nitrophenyl)triazene; 1-(4-phenyl-acetophenone oxime)-3-(2-methoxy-4-nitrophenyl)triazene; 1,3- bis(4-acetylphenyl)triazene; 1-(3-phenyl-acetophenone oxime)-3-(4-nitrophenyl)triazene; 1-(4- acetilphenyl)-3-(4-nitrophenyl)triazene. Were synthesized ten new complexes of mercury(II) by varying the ligands and the stoichiometry of the reactions. The complexes were synthesized are: bis[1,3-bis(4-phenylacetophenone oxime)triazenide]mercúrio(II); bis[1,3-bis(3-phenylacetophenone oxime)triazenide]mercúrio(II); bis[3-(4-phenylacetophenone oxime)-1-(4-nitrophenyl)- triazenide]mercúrio(II); {[1,3-bis(4-phenylacetophenone oxime)triazenide](acetate)mercúrio(II)}; {[1- (3-phenylacetophenone oxime)-3-(2-metoxi-4-nitrophenyl)triazenide](acetate)mercúrio(II)}; {[1-(3- phenylacetophenone oxime)-3-(2-fluorophenyl)triazenide](acetate)mercúrio(II)}; {[1-(3- phenylacetophenone oxime)-1-(2-metoxi-4-nitrophenyl)triazenide](acetate)mercúrio(II)}; bis{[1,3- bis(4-acetilphenyl)triazenide](triphenylfosfine)mercúrio(II)}; bis{[1-(4-acetilphenyl)-3-(4- nitrophenyl)triazenides](triphenylfosfine)mercúrio(II)}; bis{[1,3-bis(2-methoxy-4- nitrophenyl)triazenide](piridine)mercúrio(II)}.