New Triphenylamine-Based Oligomeric Schiff Bases Containing Tetraphenylsilane Moieties in the Backbone

oleh: Patricio A. Sobarzo, Alexis F. González, Eduardo Schott, Luis H. Tagle, Alain Tundidor-Camba, Carmen González-Henríquez, Ignacio A. Jessop, Claudio A. Terraza

Format: Article
Diterbitkan: MDPI AG 2019-01-01

Deskripsi

Three new triphenylamine-based oligomeric Schiff bases (polySB1, polySB2 and polySB3) containing tetraphenylsilane core (TPS-core) in the main chain were obtained from TPS-core-based diamines and bis(4-formylphenyl)phenylamine by a high-temperature polycondensation reaction. These new oligomers were structurally characterized by FT-IR, NMR and elemental analysis. All polySBs were highly soluble in common organic solvents, such as chloroform, tetrahydrofuran and chlorobenzene. Samples showed moderate molecular average molecular weight (Mw) and a high thermal stability above 410 &#176;C. Likewise, polySBs showed absorption near 400 nm in the UV-vis range and photoluminescence. The HOMO levels and band-gap values were found in the ranges of &#8722;6.06 to &#8722;6.18 eV and 2.65&#8315;2.72 eV, respectively. The lowest band-gap value was observed for polySB2, which could be attributed to a more effective <i>&#960;</i>-conjugation across the main chain. The results suggest that silicon-containing polySBs are promising wide-band-gap semiconductors materials for optoelectronic applications.