Tricky but repeatable synthetic approach to branched, multifunctional silsesquioxane dendrimer derivatives

Abstract

The efficient one-pot procedure based on a sequence of hydrosilylation and reduction reactions was applied to obtain carbosilane dendrimers with different silsesquioxane (SQ) cores, i.e. from mono-T8SQ, octa-T8SQ to di- and tetrafunctional double-decker silsesquioxanes.

Metallodendrimers Unveiled: Investigating the Formation and Features of Double-Decker Silsesquioxane-Based Silylferrocene Dendrimers

“…SQs exhibit exceptional thermal stability and tunable properties, making them attractive for use in fields such as catalysis, nanomaterials, coatings, and energy storage. Furthermore, their ability to integrate organic and inorganic components provides a platform for tailoring properties and designing advanced materials with enhanced performance and multifunctionality. − There are some reports of the conjunction of silsesquioxane with ferrocene in diverse combinations, e.g., to form amphiphilic systems, grafted copolymers with magnetic properties, or porous materials for dye/heavy metal absorption features. ,,,,,− Some of these systems exhibit interesting electrochemical properties, influencing their application. On the contrary, the distinct types of dendrimer cores should be also mentioned, but there are significantly lower numbers of papers concerning silsesquioxane-based dendrimers using ferrocene moieties as terminal fragments. ,, …”

Exploring Polyol-Functionalized Dendrimers with Silsesquioxane Cores

“…This structure results in the formation of dumbbell-shaped systems rather than spherical ones. 47,48 This paper presents the synthesis of G1, G1. In the beginning, the G1 dendritic systems with hydroxyl groups were synthesized using a different type of silsesquioxane cores, i.e., monosubstituted T 8 -type SQs and di-and tetrasubstituted DDSQs.…”

“…An increasingly prevalent trend is the tailored approach to distinct stages in the synthetic route of novel compounds, especially intricate SQsbased dendritic systems. 47,48 Synthesis of the G1.5 Generation of Silyl Dendrimers with Silsesquioxane Cores. The next step of the research was to modify the G1 dendritic systems to obtain silsesquioxanes possessing a reactive group susceptible to further modification, i.e., −O−Me 2 Si−H.…”

“…Analogous changes were observed for 13 C and 29 Si NMR. The 13 C NMR (see Figure S7a, 48 The developed reaction conditions were adapted to obtain dumbbell-like dendritic systems with a DDSQ core. The following stoichiometry was used to obtain G1.…”

“…However, there is a limited number of reports on their hydroxyl-terminated dendritic derivatives. − Also, it should be emphasized that information about the appliance of DDSQ as the core of dendrimers is still scarce. This structure results in the formation of dumbbell-shaped systems rather than spherical ones. , …”