Facile preparation and properties of polyhedral oligomeric silsesquioxane (POSS) nano-hybrid materials with disaggregation effect

Abstract

This work reports on a facile and efficient strategy for preparing a class of chromophores- including organic-inorganic functional hybrid materials. These hybrid materials are based on pyrene and octavinyl-polyhedral oligomeric silsesquioxane (OV-POSS), in which the positive vinyls in OV-POSS were heck coupling reacted with pyrenes. It was found that the incorporation of polyhedral oligomeric silsesquioxane (POSS) can significantly precluded aggregation of hybrid molecules due to the inhibition of π-π stacking between chromophore units, which were also further confirmed by theoretical simulation. Moreover, the fluorescence quantum efficient of H2 (Φsolid = 80%) is higher than H1 (Φsolid = 65%) and H3 (Φsolid = 68%), respectively. AFM and OM images showed the smooth surface structure of the hybrid film, which demonstrated that the incorporation of inorganic POSS could improve the film-forming property of organic chromophores. Simultaneously, thermogravimetric analysis (TGA) results also display inorganic POSS core leads to the good thermal stabilities (>250 °C) of the functional hybrids materials.