Novel branched nanostructures based on polyhedral oligomeric silsesquioxanes and azobenzene dyes containing different spacers and isolation groups

Abstract

Novel branched azobenzene-modified POSS nanostructures have been prepared.

Light‐Responsive Polymer Membranes

“…More robust photoresponsive coatings can be synthesized from organic azobenzene dyes and polyhedral oligomeric silsesquioxanes (Azo‐POSSs). Tkachenko et al described the synthesis of a new series of branched Azo‐POSS structures with different flexible spacers between the inorganic POSS cores . These new hybrid materials were able to form thin and smooth films characterized by enhanced thermal, mechanical, and optical properties.…”

Antimicrobial sulphonamide azo dyes

“…Additionally, the breakage of the azo bond in the colon has enabled the development of approaches for drug delivery to that organ. The azo linkage has been fused to hydrogels for colonic drug delivery, for instance, of anti‐tumour therapeutics . Soluble Prontosil has recently been reported as an excellent inhibitor of β ‐CA, a new drug target acquired from the elucidation of the genome of Mycobacterium tuberculosis .…”

“…The azo linkage has been fused to hydrogels for colonic drug delivery, for instance, of anti-tumour therapeutics. 82 Soluble Prontosil has recently been reported as an excellent inhibitor of β-CA, a new drug target acquired from the elucidation of the genome of Mycobacterium tuberculosis. 83 Likewise, the metal complexing capabilities of salicylic acid derivatives prompted the development of antimicrobial azo dyes utilising metal ion toxicity to exert a cell-killing effect.…”

“…The partial positive charge is distributed over the whole ring, which enhances the lipophilicity of the compound, thereby enabling it to penetrate the cell membrane of the pathogen. 51 Sulphonamide azo dye ligands (82)(83)(84) were synthesised by azo coupling sulphaguanidine or sulphadiazine diazonium salts These sulphonamide complexes could be used in a simple treatment system for coloured industrial wastewater. Such treatment would involve the sulphonamide complex-catalysed decomposition of hydrogen peroxide, which would induce the generation of hydroxyl radicals (HO · ), powerful oxidants that will attack the target dye ( Figure 18).…”

High Refractive-Index Hybrids Consisting of Water-Soluble Matrices with Bipyridine-Modified Polyhedral Oligomeric Silsesquioxane and Lanthanoid Cations

“…Polyhedral oligomeric silsesquioxane (SSQ) has attracted attention as a platform for preparing advanced optical materials [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. By employing SSQ, the functional units can be accumulated in the compact space at the molecular level [ 17 , 18 , 19 ].…”