Chelate polymers. IV. siloxanes functionalized with chelating groups derived from hydroxy-ketones, their metal complexes and some polymers

Abstract

New ligands were obtained by the reaction of 1,3-bis(3-aminopropyl)tetramethyldisiloxane, with acetylacetone, 2,4-dihydroxybenzophenone and 2,4-dihydroxyacetophenone. The structures were confirmed by electronic, IR and 1 H NMR spectroscopy and elemental analysis. The change of the refractive index of the siloxanes by their chemical modification was also examined. These compounds were used for coordination of some divalent metals. The ligands and their metal complexes were both soluble in common solvents, such as CHCl 3 , dimethylformamide, dimethylsulfoxide, N-methyl-2-pyrrolidone. Some of the bifunctional chelates were inserted into polymeric structures by polycondensation with the diacid chloride of bis(p-carboxyphenyl)diphenylsilane.

Influence of Chemical Structure on Processing and Thermotropic Properties of Poly(siloxane-azomethine)s

“…In our group a large number of polymers containing siloxane units and azomethine linkages have been synthesized by different approaches: using bisphenols with preformed azomethine groups in polycondensation reactions [8,9] or starting from organic dialdehydes and siloxane diamines [10,11]. The complexation capacity was also investigated, as well as their thermotropic properties or self assembling behavior [8][9][10][11][12][13][14][15][16].…”

,Polyazomethines. Synthesis, properties and applications (review)

“…Азометины используются в качестве пигментов и красителей, катализаторов [18], интермедиатов в органическом синтезе [19], в аналитической химии [20,21], как полимерные стабилизаторы [22]. Известны примеры их использования для экстракции металлов [23,24] и получения тер-мостойких полимеров хелатного типа [25][26][27] и поликомплексов [28]. Азометиновые красители используются в качестве компонентов для красок при изготовлении синтетических волокон.…”

Metallopolymers based on a polyazomethine ligand containing rigid oxadiazole and flexible tetramethyldisiloxane units

“…There are several synthetic routes to these materials. In general, the methods include the complexation between a ligand group anchored on a polymer matrix and a metal ion, the reaction of a multifunctional ligand with a metal ion, and the polymerization of metal‐containing monomers …”