Control of the Organization of 4,4′-bis(carbazole)-1,1′-biphenyl (CBP) Molecular Materials through Siloxane Functionalization

Abstract

We show that through the introduction of short dimethylsiloxane chains, it was possible to suppress the crystalline state of CBP in favor of various types of organization, transitioning from a soft crystal to a fluid liquid crystal mesophase, then to a liquid state. Characterized by X-ray scattering, all organizations reveal a similar layered configuration in which layers of edge-on lying CBP cores alternate with siloxane. The difference between all CBP organizations essentially lay on the regularity of the molecular packing that modulates the interactions of neighboring conjugated cores. As a result, the materials show quite different thin film absorption and emission properties, which could be correlated to the features of the chemical architectures and the molecular organizations.

Non-fused BODIPY-based acceptor molecules for organic photovoltaics

“…S64, ESI †). 37 BTT R8 -4F forms a frozen liquid crystal like mesophase in which the domains of self-assembled BTT units and domains of molten chains alternate, giving SWAXS patterns composed of broad wide-q scattering signals from the self-assembly inside domains and sharp reflections in the small-q region from the domain alternation (see SWAXS patterns in Fig. S65, ESI †).…”