Joseph B. Carroll

Electrostatic self-assembly of structured gold nanoparticle/polyhedral oligomeric silsesquioxane (POSS) nanocomposites

Hybrid inorganic/organic composite materials composed of gold nanoparticles of varying size (1.5 and 6.8 nm) and polyhedral oligomeric silsesquioxane (POSS) units were created using electrostatic self-assembly. Carboxylic acid-functionalized mixed monolayer protected gold clusters (MMPCs) were mixed with trimethyl quaternary ammonium-functionalized POSS units, providing well-ordered aggregates. The aggregates were characterized with transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS), revealing an increase in average interparticle spacing upon assembly with POSS. This increase in spacing was shown to influence the surface plasmon resonance band of the larger 6.8 nm Au nanoparticles as characterized by UV/Vis spectroscopy.

Self-assembly of gold nanoparticles through tandem hydrogen bonding and polyoligosilsequioxane (POSS)–POSS recognition processes

Diaminopyridine-functionalized polyhedral oligomeric silsequioxanes (POSS-DAP) self-assemble with complementary thymine-functionalized Au nanoparticles (Thy-Au) into well-defined spherical aggregates, providing highly structured nanocomposites.

Surface modification via‘lock and key’ specific self-assembly of polyhedral oligomeric silsequioxane (POSS) derivatives to modified gold surfaces

Diaminopyridine (DAP) functionalized POSS derivatives self-assemble on thymine functionalized monolayers on gold surfaces affording hybrid inorganic/organic surfaces.

Proton transfer versus redox modulation in thiourea-phenanthrenequinone molecular and polymeric complexes

Phenanthrenequinone undergoes highly efficient proton transfer processes in the presence of a thiourea-functionalised polystyrene copolymer whereas interactions with a similar benzyl-thiourea monomer show strong redox modulation of the quinone without proton transfer.

Molecular recognition in a uradinyl-functionalized stable radical

Stable radical 2-(6-uradinyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-oxyl (1) binds to hydrogen-bonding complement 2,6-di(propylamido)pyridine (DAP) in chloroform with Ka=220 M(-1) at 33 degrees C; ESI-MS shows not only 1:DAP complementary dyad formation, but also 1:(DAP)2 formation at higher concentrations of DAP.

The electrochemically-tuneable interactions between flavin-functionalised C60 derivatives and 2,6-diethylamidopyridine

We report the electrochemically-tuneable interactions between flavin-functionalised C60 derivatives and a diamidopyridine derivative.