Siloxane Copolymers Containing Crown Ethers

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“…The general procedure was as follows: bis(4-chloroformyl)dibenzo-18-crown-6 (CE2) was prepared by the reaction of bis(4-carboxy)-dibenzo-18-crown-6 (CE1) with thionyl chloride in the presence of N,N-dimethylformamide as catalyst [14,18] and 4,49-diaminodibenzo-18-crown-6 (CE3) was obtained by a procedure described elsewhere. The synthesis and characterization of the intermediates and carrier was presented elsewhere.…”

“…[14] By the same technique, the siloxane-crown-ether polyamide was obtained through the reaction of a,x-bis(3-carboxypropyl)-polydimethylsiloxane with 4,49-diaminodibenzo-18-crown-6. [14] By the same technique, the siloxane-crown-ether polyamide was obtained through the reaction of a,x-bis(3-carboxypropyl)-polydimethylsiloxane with 4,49-diaminodibenzo-18-crown-6.…”

“…Polydimethylsiloxane Oligomers [14] The synthesis of a,x-bis(3-hydroxypropyl)-polydimethylsiloxanes was achieved through cationic ring-opening polymerization of octamethylcyclotetrasiloxanes in the presence of 1,3-bis(3-hydroxypropyl)tetramethyldisiloxane and a styrene-divinylbenzene ion exchanger with sulfonic acid groups (VIONIT CS 34C) as catalyst. The reaction mixture was stirred for 36 h at 80 8C, cooled to room temperature and filtered.…”

“…Synthesis of Siloxane-Crown Ether Polyester (PSE) [14] To a solution of 6.93 g (7 6 10 -3 mol) a,x-bis(3-hydroxypropyl)-polydimethylsiloxane oligomer with M n = 1 000 in 1.2 ml pyridine and 50 ml anhydrous methylene chloride, a solution of 3.4 g (7 6 10 -3 mol) bis(49-chloroformyl)dibenzo-18-crown-6 in 30 ml anhydrous methylene chloride was added dropwise, under nitrogen atmosphere and continuous stirring at room temperature within 1 h. This reaction mixture was stirred at room temperature for 15 h, then refluxed for another 2 h. After cooling, the pyridine chlorohydrate was filtered and the solvent was distilled under vacuum. Finally, a rubber-like brown-yellowish product was obtained (g = 87%).…”

Polysilane–Metal Complexes for Organic Semiconductors

“…Polymer-metal complexes have been obtained through complexation of polymeric ligands with metal [4][5][6], through complexation of difunctional ligand with metal ion [7][8][9], through polymerization of metal complexes [10,11] or in the form of cluster complexes [12][13][14].…”