Development of new precursors for immobilizing dyes onto silica surfaces

Amide-tethered organosilatranes: Syntheses, structural characterization and photophysical properties

“…to the solution of 4g, this band diminishes (Fig. 13), which indicates the binding of ions with 4g [8]. Similarly, the peak intensity due to 4g in the fluorescence emission spectrum decreases when 1.00 equivalent copper ions are added, verifying the complexation (Fig.…”

“…addition, nucleophilic substitution, exchange and photochemical reactions [6]. Organosilatranes are recently explored as new substrates for preparing advanced organic-inorganic hybrid materials by the surface functionalization of metal oxides via siloxyl bonds [7,8]. Earlier, organotriethoxysilanes (OTES) have been used to form siloxane monolayer on a metal oxide surface [9].…”

Functionalized silica nanoparticles for trapping Pb2+ ions via diazo‐azomethine scaffolds

“…In our previously reported work, we fabricated dye‐coated silica nanoparticles using a silatrane possessing diazo‐azomethine functionality in an exocyclic position for the adsorption of Cu 2 + ions . In continuation of that work, we extend herein the application of diazo‐azomethine‐functionalized silica nanoparticles for the adsorption of Pb 2 + ions, which are present in high concentration in plants and other leafy vegetables.…”

Mechanism and properties of coloured nanoscale SiO2 prepared from silica and reactive dyes

“…This inspired an attempt to attach reactive dyes to SiO 2 via covalent bonds. Unfortunately, the experimental results showed that SiO 2 does not allow direct immobilisation of reactive dyes, apart from introducing some groups for dye attachment to SiO 2 [5,32,[40][41][42]. In the present work, KH560-modified SiO 2 was synthesised by a one-step solgel method, and then CI Reactive Blue 4 (X-BR) was immobilised onto the KH560-modified SiO 2 via nucleophilic substitution.…”

“…The permanent incorporation of colorant into the SiO 2 matrix is a way to overcome these drawbacks. Azo dyes with a reactive unsaturated chromophore group have been designed by Kaur et al [32]. These azo dyes covalently bind to modified SiO 2 , which is useful for analytical and catalytic applications, but they possess poor colour properties.…”