Author: Chullikkattil P. Pradeep

Programmable Surface Architectures Derived from Hybrid Polyoxometalate-Based Clusters

2011

The exploration of the self-organization of a range of the polyoxometalate-based molecular structures reveals a diverse range of surface patterns and morphologies on solid substrates of technological interest, including methylated and hydroxylated silicon surfaces (namely, SiCH3 and SiOH). By exploiting the interplay between the intrinsic molecular properties and the surface chemistry as well as dynamic spatiotemporal phenomena (e.g., dewetting), we show that these systems can yield 0D, 2D, and 3D architectures via solution deposition at the solid surface, including nanodots, discs, lamellas, porous networks, and layer-by-layer assemblies. In general, we observed that layer-by-layer growth …

Materials scienceSiliconSolid surfaceDrop (liquid)chemistry.chemical_elementNanotechnologySurface energySurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsHigh surfaceGeneral EnergychemistryChemical physicsPolyoxometalateNanodotDewettingPhysical and Theoretical ChemistryThe Journal of Physical Chemistry C

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Assembly of modular asymmetric organic-inorganic polyoxometalate hybrids into anisotropic nanostructures.

2010

Three organic-inorganic hybrid Mn-Anderson polyoxometalates (POMs), with both symmetrical and asymmetrical appended groups, have been synthesized, identified using electrospray mass spectrometry, and isolated using an approach that allows the three AA, BB, and AB compounds to be structurally characterized. Investigation of the self-assembly of the hybrids on hydrophilic surfaces reveals the formation of nanofibres with characteristics that reflect the nature of the substitution of the POM yielding a route to the programmed assembly of anisotropic hybrid nanostructures.

Models MolecularNanostructureElectrospray mass spectrometryChemistryGeneral ChemistryTungsten CompoundsBiochemistryCatalysisMass SpectrometryNanostructuresSelf-assembly Langmuir-Blodgett Scanning Force Microscopy Polyoxomethalates Hybrid Anysotropic NanostructuresColloid and Surface ChemistryChemical engineeringInorganic ChemicalsPolyoxometalateOrganic inorganicOrganic chemistryAnisotropyOrganic ChemicalsAnisotropySettore CHIM/02 - Chimica FisicaHybridJournal of the American Chemical Society

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Exploring the Interplay Between Ligand Derivatisation and Cation Type in the Assembly of Hybrid Polyoxometalate Mn-Andersons

2012

Herein a library of hybrid Mn-Anderson polyoxometalates anions are presented: 1, [(MnMo6 O18 )((OCH2 )3 -C-(CH2 )7 CHCH2 )2 ](3-) ; compound 2, [(MnMo6 O18 )((OCH2 )3 C-NHCH2 C16 H9 )2 ](3-) ; compound 3, [(MnMo6 O18 )((OCH2 )3 C-(CH2 )7 CHCH2 )1 ((OCH2 )3 C-NHCH2 C16 H9 )1 ](3-) ; compound 4, [(MnMo6 O18 )((OCH2 )3 C-NHC(O)CH2 CHCH2 )2 ](3-) and compounds 5-9, [(MnMo6 O18 )((OCH2 )3 C-NHC(O)(CH2 )x CH3 )2 ]), where x = 4, 10, 12, 14, and 18 respectively. The compounds resulting from the cation exchange of the anions 1-9 to give TBA (a) and DMDOA (b) salts, and additionally for compounds 1, 2 and 3, tetraphenylphosphonium (PPh4 ) (c) salts, are explored at the air/water interface using scan…

Hexagonal crystal systemChemistryLigandStereochemistrySupramolecular chemistryGeneral Chemistrypolyoxometalate AFM self-assembly thin filmsBiomaterialsCrystallographyCovalent bondPolyoxometalateGeneral Materials ScienceScanning Force MicroscopyBiotechnologySmall

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