Preparation and Properties of Disilane and Disiloxane Unit-Fused Poly(diphenylamine)

Disilane unit-fused poly(diphenylamine) (poly(10,11-dihydro-10,11-disila-5,10,10,11,11-pentamethyl-5H-dibenz[b,f]azepine-2,8-diyl), PDSiAzep) were prepared and properties of these compounds were studied. Oxidation of PDSiAzep led to related disiloxane-fused poly(diphenylamine) (poly(5,7-disila-6-oxa-5,5,7,7,12-pentamethyl-5,6,7,12-tetrahydrodibenz[b,g]azocine-3,9-diyl) PSiO). These polymers have new heterocyclic unit. Not only UV and Cyclic voltammetry (CV) measurements but also X-Ray crystallography of the related dibromide suggested that the structure of the bridging unit affected π-conjugation through the N atom. The highest conductivities of electrochemically doped PDSiAzep and PSiO were 2.0 × 10-4 and 1.3 × 10-2, respectively. Turn-on bias voltage of a double layer electroluminescent device comprising PDSiAzep was higher than that of PSiO. These electrical properties were depended on effective π-conjugation through the N atom.

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