A new supramolecular polyhedral oligomeric silsesquioxanes (POSS)–porphyrin nanohybrid: synthesis and spectroscopic characterization

Architecture, Assembly, and Emerging Applications of Branched Functional Polyelectrolytes and Poly(ionic liquid)s

“…147,148,149,150,151,152,153,154,155,156,157,158,159,160 Based on the range of molecular masses involved, these compounds can be regarded as OIL compounds. Their molecular weight depends on the length of the spacer and the type of the ionic group and starts from 1338 g/mol for derivatives with one arm 147 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 temperature of 172°C.…”

“…The IL-groups are represented by terminal aliphatic tertiary amines with various lengths of the aliphatic substituent at the nitrogen atom,147,148,149,151,156,158 and also 1-substituted imidazole groups 150,153,154,155,159,161,162. The classical anionic groups are usually used as counterions (Figure 2).The charge density is regulated either by synthesis of monosubstituted POSS with varied spacer lengths, or by the degree of quaternization of these amino-containing substituents in the case of octasubstituted POSS 147,149,153,154,155. The variation of nitrogen substitution in the ionic group, the counterion structure, and the charge density have a dramatic effect on the properties of POSS-IL compounds.…”

Highly untangled multiwalled carbon nanotube@polyhedral oligomeric silsesquioxane ionic hybrids: Synthesis, characterization and nonlinear optical properties

“…In the course of our studies regarding the synthesis and properties of POSS tetraalkylammonium (POSS-QAs) ILs [16][17][18], we have found that ''pendant functionalized'' monosubstituted R 7 -POSS-NMe 3 + (R = isooctyl) ILs, in contrast with conventional ones, display a chemical behavior determined by the bulky amphiphilic cation. This, being characterized by a hydrophobic organic corona on the ''OASiAO'' siloxane core and a hydrophilic ammonium pendant group, exhibits a cationic surfactant behavior in organic solvents and a remarkable extraction capability of various polyanions from aqueous solution.…”

“…This, being characterized by a hydrophobic organic corona on the ''OASiAO'' siloxane core and a hydrophilic ammonium pendant group, exhibits a cationic surfactant behavior in organic solvents and a remarkable extraction capability of various polyanions from aqueous solution. Such features have been exploited to extract TPPS (TPPS = mesotetrakis-(4-sulfonatephenyl)porphyrin) tetraanion from water solution via a simple biphasic chloroform/water procedure, and to afford the 1:4 POSS@TPPS adduct [17]. This represents the first example of hybrid POSS@porphyrin ionic liquid.…”

“…This represents the first example of hybrid POSS@porphyrin ionic liquid. Optical, light scattering and scanning electron microscopy (SEM) investigations on POSS@TPPS adduct demonstrated that the ''bulky'' POSSNMe 3 + acts as a highly dispersing agent toward the TPPS tetraanion, reducing its well known aggregation tendency, both in solution and in the solid state [17]. Hence, ionic self-assembly promoted by amphiphilic POSS-ILs turned out to be a useful alternative strategy to access, with respect to conventional covalent approaches [19][20][21], to novel POSS-multifunctional materials.…”