One-pot synthesis and characterization of HMS silica carrying Disperse-Red-1 (DR1) covalently bonded to the inner surface

Abstract

Through a one-step procedure, covalent bonding of Disperse-Red-1 (DR1) dye to the internal surface of HMS silica has been achieved, leading to anchored molecules freely accessible to gases. Template removal by different solvents yields surface with different polarities, which affect the optical properties of DR1. This effect is dramatic when extraction is carried out in refluxing ethanol, because ethoxylation of the silica surface occurs. To cite this article: B.

Structured mesoporous organosilicas from an acetonitrile–water template system

“…Previously, we have published work on the incorporation of this dye into mesoporous silicas using the same direct synthesis, but in aqueous ethanol. [41][42][43] As can be seen from the data in Table 1 the material 3 formed is very similar to the others, indicating the success of the functionalisation, even with a relatively bulky system. The slight reduction in framework pore size is indicative of the aromatic dye molecule partitioning into the micellar palisade region, increasing the curvature of the micelle, and thereby reducing the pore diameter.…”