Exterplex formation of poly(3,6-di-tert-butyl-9-vinylcarbazole) and its dimeric model compounds with dimethyl terephthalate studied by fluorescence spectroscopy

Abstract

The emission properties of poly(3,6-di-tert-9-vinylcarbazole) (PBVC 2 ) and its dimeric model compounds were investigated in the presence of an electron acceptor, dimethyl terephthalate (DMTP). In spite of the steric hindrance of tert-butyl groups, all these compounds formed a partially-overlapped exterplex, which is in sharp contrast to the fact that the meso isomer of 2,4-bis(3,6-di-tert-butyl-9-carbazolyl)pentane (m-BC 2 Pe) and 1,3-bis(3,6-di-tert-butyl-9-carbazolyl)propane (BC 2 Pr) do not form any intramolecular excimer. This means that the conformational requirement for the formation of the exterplex is rather loose and that the stabilizationenergy is larsger than that for the formation of the excimer