Transformação estrutural no estado sólido de polímeros de coordenação de duas e três dimensões contendo o ligante flexível 4-α,α’-xilenodiilabis(fenilfosfinato)

Abstract

Cobalt, nickel, copper and zinc acetate salts were reacted with the 1,4-α, α'- xylenediylabis(phenylphosphinate) (XBPP) ligand and two-dimensional CoII and ZnII coordination polymers were reacted with temperature control: by heating at reflux [Co (XBPP)]-aP (1-aP, triclinic) and [Zn(XBPP)]-aP (3-aP, triclinic); hydrothermal reaction (170 ° C and slow cooling) [Co(XBPP)]-mP (1-mP, monoclinic) and [Zn(XBPP)]-mP (3- mP, monoclinic); dehydration (desiccator with concentrated sulfuric acid) [Co(XBPP)]- am (1-am) from the compound [Co(OH2)6](XBPP)·2H2O. The reaction conditions did not influence the synthesis with CuII and the compound [Cu(XBPP)] (2) was obtained. The 4,4'-bipyridine bidentate co-ligand was used to increase the dimensionality of the structures in relation to compounds already synthesized by the work group and the coordination polymers of CoII and NiII, [Co(XBPP)(bpy)(OH2)2]·2H2O-mC (4-mC, monoclinic), [Ni(XBPP)(bpy)(OH2)2]·2H2O-mC (5-mC, monoclinic), [Ni(XBPP)(bpy)(OH2)2](bpy)(OH2)2]·2H2O-aP (5-aP, triclinic) and [Co(XBPP)(bpy)(OH2)2]·2H2O-mC (4-aP, triclinic). The bipyridine-containing compounds were subjected to two types of treatment for the removal of the bipyridine group - oven heat treatment at 300 ° C or methanol extraction treatment - in order to remove the bipyridine group and activate them for gas adsorption N2 ([Co(XBPP)-APL, 6-APL, [Co(XBPP)-APA, 6-APA and [Ni(XBPP)]-APA, 7-APA), with little adsorption capacity observed.