Post-synthesis modification of functionalised polyhedral oligomeric silsesquioxanes with encapsulated fluoride – enhancing reactivity of T₈-F POSS for materials synthesis

Abstract

Previous studies have demonstrated that functionalised T8 polyhedral oligomeric silsesquioxanes with fluoride anions encapsulated within the T8 cage (T8-F) have very low reactivity, with no reports of successful modification of...

Crosslinked siloxane–silsesquioxane elastomer with pyrene functionalization for rapid adsorption of benzene, toluene, and xylene (BTX) from water and sensing of charged species

“…52,53 The susceptibility of POSS derivatives to bases may lead to a cage structure transformation into a partially-open cage structure. 54–56 This was confirmed by the presence of weak and broad signals of O–H stretching in the range of 3200–3500 cm −1 (Fig. 1d and Table S1†).…”

Mono and Dumbbell Silsesquioxane Cages as Dual-Response Fluorescent Chemosensors for Fluoride and Polycyclic Aromatic Hydrocarbons

“…Moreover, the 19 F­{ 1 H} NMR experiment (Figure S44) can confirm the fluoride–SQ cage reaction. There are some studies of fluoride encapsulation of the SQ cage using the NMR spectroscopy technique for a better understanding of the SQ cage–fluoride interaction. , From the literature, the encapsulation of fluoride often shows the peak at −20 to −30 ppm. However, the result from Figures and S39 observes the new peaks at −119.58 and −128.89 ppm, Therefore, we hypothesize that fluorides would not be encapsulated but rather reacted with one of silicon.…”

Synthesis of Multifunctional Oligomethylsilsesquioxanes by Catalyst-Free Hydrolytic Polycondensation of Methyltrimethoxysilane under Microwave Radiation

“…Organosilsesquioxanes insoluble in organic solvents are used as sorbents and fillers [ 4 , 5 , 6 , 7 , 8 ]. Low molecular weight and polyhedral silsesquioxanes are effective as chain structural elements or molecular additives that increase the thermal stability and strength of composites [ 9 , 10 , 11 , 12 , 13 ].…”

“…Soluble highly functional organosilsesquioxanes are of particular interest. The complexity of obtaining such structures by traditional approaches, such as hydrolytic polycondensation of organotrichlorosilanes [ 1 , 22 ] and catalytic hydrolysis of organotrialkoxysilanes [ 3 , 23 , 24 ], is due to high degree of condensation of the products, caused by the high reactivity of the monomer, and the formation of hydrochloric acid during the reaction in the first case and the using of catalysts in the second [ 9 ].…”