A Family of Cagelike Mn-Silsesquioxane/Bathophenanthroline Complexes: Synthesis, Structure, and Catalytic and Antifungal Activity

Abstract

This study reports a novel family of cage manganesesilsesquioxanes prepared via complexation with bathophenanthroline (4,7-diphenyl-1,10phenanthroline). The resulting Mn 4 -, Mn 6 Li 2 -, and Mn 4 Na-compounds exhibit several unprecedented cage metallasilsesquioxane structural features, including intriguing self-assembly of silsesquioxane ligands. Complexes were tested in vitro for fungicidal activity against seven classes of phytopathogenic fungi. The representative Mn 4 Na-complex acts as a catalyst in the cycloaddition of CO 2 to epoxides under solvent-free conditions to form cyclic carbonates in good yields.

Fe(III)-Based Phenylsilsesquioxane/Acetylacetonate Complexes: Synthesis, Cage-like Structure, and High Catalytic Activity

“…Hybrid organo-inorganic metallacomplexes based on branched silsesquioxane ligands tend to form intriguing molecular geometries (cage-like metallasilsesquioxanes (CLMSs)). − The wide list of CLMSs’ functionalities spans antifungal activity, magnetic properties (including examples of single-molecule magnets , or spin glasses), and optical behavior − (including the first examples of CLMSs’ temperature sensor , ). Regarding materials science, the design of CLMS-based anode materials, flame retardants, and functional coordination polymers − should be mentioned.…”

A Family of Hexacopper Phenylsilsesquioxane/Acetate Complexes: Synthesis, Solvent‐Controlled Cage Structures, and Catalytic Activity

“…[32] In turn, CLMSs are well-known as efficient homoand heterogeneous catalysts as well as components of catalytic systems. [27,[33][34][35][36][37][38][39] Among recent reports, CLMSs' activity in (i) deacetalization/deketalization-Knoevenagel reactions, [40] (ii) Chan-Evans-Lam couplings, [41] (iii), Baeyer-Villiger reactions, [42] (iv) CO 2 valorization, [31,43] and (v) carboxylations, [44] has been found. In parallel, one may recall the well-known activity of transition metal complexes in catalysis of the oxidations of hydrocarbons and alcohols involving the functionalization of CÀ H bonds.…”

Vanadium-Silsesquioxane Nanocages as Heterogeneous Catalysts for Synthesis of Quinazolinones

“…Different from conventional organic ligands, silsesquioxane ligands, typical organic–inorganic hybrid compounds, containing both organic substituents and inorganic Si–O–Si skeletons can form diverse oligomeric cyclic or acyclic motifs that are sensitive to experimental conditions. , That means that if we alter the pH value of the solution, the silsesquioxane ligand could be converted to other forms with varying condensation degrees. On the other hand, the terminal oxygen atoms within silsesquioxane ligands are capable of binding a variety of multiple metal ions including transition metal ions, lanthanide ions, and main-group metal ions and hold them together giving rise to highly stable and active metal cluster catalysts. − Comparatively, since vanadium ions are promising candidates in the catalysis community, silsesquioxane-protected POVs are thereby of considerable interest especially in mimicking the silica-supported vanadium catalyst. , However, V-silsesquioxane clusters are rarely reported and the highest-nuclearity V-silsesquioxane cluster is V 3 until now …”