Synthesis of a new siloxane‐crown ether polyamide

Abstract

The synthesis of a siloxane-crown ether polyamide by solution polycondensation of 4,4'-diaminodibenzo-18-crown-6 with a carboxypro yl terminated siloxane oligomer is presented. The polymer is characterized by IR and H NMR spectroscopy as well as by differential thermal analysis and differential scanning calorimetry.

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].…”

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“…Synthesis of 4,49-Dinitro-dibenzo-18-crown-6 [15] Nitration of dibenzo-18-crown-6 was performed as described [21a] but instead of heating for 3 h, stirring at room temperature for 24 h was preferred. Chloroform was then added, the organic layer was separated and the aqueous layer was extracted twice with fresh chloroform.…”

“…Synthesis of 4,49-Diamino-dibenzo-18-crown-6 (CE 3) [15] This was accomplished by reduction with hydrazine hydrate and Pd/C as catalyst according to ref. [21b] Ethanol served as solvent instead of ethylene glycol monomethyl ether.…”

“…Synthesis of 1,3-Bis(3-carboxypropyl)-1,1,3,3tetramethyldisiloxane [15] Vigorous hydrolysis was performed according to Mulvaney and Marvel [21 c] but the reaction time was increased to 17 h. The cooled reaction mixture was extracted twice with diethyl ether, the combined ethereal layers were thoroughly washed with water until neutral reaction to litmus. The solution dried over anhydrous Na 2 SO 4 was filtered and subjected to distillation until all ether was removed.…”

“…Synthesis of a,x-Bis(3-carboxypropyl)polydimethylsiloxane [15] The oligomer was prepared following the procedure described in ref. [14] In order to obtain a molecular weight (M n ) of about 1 500 for the polymer, a 1 : 4 weight ratio of disiloxane/octamethylcyclotetrasiloxane was employed.…”