Until recently the spectacular developments in nanotechnology have been with little regard to their potential effect on human health and environment. There are no specific regulations nanoparticles except existing covering same material bulk form. Difficulties abound devising such regulations, beyond self-imposed by responsible companies, because of likelihood different properties exhibited any one type nanoparticle, which tuneable changing size, shape surface characteristics. Green...

A paradigm shift away from using solvents in organic synthesis as solventless reactions can lead to improved outcomes, and more benign synthetic procedures, for example aldol condensation reactions, sequential Michael addition en route Kröhnke type pyridines, leading 3-carboxycoumarins, benzylidenes, 4-aryl-1,4-dihydropyridines 2-aryl-1,2,3,4-tetrahydroquinazolines, oligomerisation the of cavitands; kinetic considerations reaction two solids only be explained if a eutectic melt is formed...

The concept of an organic reaction between two macroscopic solid particles is investigated. Thus, we study several reactions that have been recently reported to proceed "in the phase" and clearly show that, in most cases, grinding reactants together results formation a liquid phase. This true both for catalytic transformations (e.g., aldol condensations oligomerization benzylic compounds) noncatalytic (Baeyer-Villiger oxidations, oxidative coupling naphthols using iron chloride, condensation...

Graphite is exfoliated into graphene by shearing vortex fluidic films of N-methyl-pyrrolidone (NMP), as a controlled process for preparing oxide free graphene, and exfoliating the corresponding boron nitride sheets.

A ternary Ag/AgBr/TiO(2) nanotube array electrode with enhanced visible-light activity was synthesized by a two-step approach including electrochemical process of anodization and an in situ photoassisted deposition strategy. The dramatically photoelectrocatalytic the composite evaluated via inactivation Escherichia coli under visible light irradiation (λ>420 nm), whose performance complete sterilization much superior to other reference photocatalysts. PL, ESR, radicals trapping studies...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBall and Socket Nanostructures: New Supramolecular Chemistry Based on CyclotriveratryleneJonathan W. Steed, Peter C. Junk, Jerry L. Atwood, Michael J. Barnes, Colin Raston, Robert S. BurkhalterCite this: Am. Chem. Soc. 1994, 116, 22, 10346–10347Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November...

p-Sulfonatocalix[4,5,6,8]arenes are versatile building blocks, able to assemble into 'molecular capsule' arrays based on two calixarenes, as well a variety of other structural motifs, with the extended structures dominated by formation bilayers. For p-sulfonatocalix[4]arene, assembly nanometre scale spheroids (of either icosahedral or cuboctahedral geometries) nanotubules (all which take features akin those viruses) is possible, depending guest molecules and lanthanides present in solution.

Mats of electrospun chitosan nanofibers were found effective in immobilizing microalgal cells. These immobilized cells also used as a durable model system for wastewater treatment which has been demonstrated by the removal around 87% nitrate from liquid effluents ([NO3−-N]initial 30 mg L−1). Virtuous rates derived superimposing physicochemical adsorption and biological nutrient consumption phenomena microalgae, respectively.

A mixture of a Ni(TMTAA) grafted crown ether and Cs[Co(C2B9H11)2] in toluene-CH2Cl2 affords 1:1 complex, comprised layers infinite two-dimensional polymeric arrays separated by the cobalticarborane anion which themselves form two B-H...Cs+ hydrogen interactions.

Charge-assisted π-stacking interactions result in the formation of large porous arrays formed from inclusion metal tris(phenanthroline) cations into p-sulfonatocalix[4]arene anions.

Icosahedral and cuboctahedral arrangements of calixarenes, a nanometer-scale, spheroidal assembly 12 calixarene molecules, can be manipulated in highly controlled fashion. Previously, such assemblies were observed to favor placement the calixarenes at vertexes an icosahedron. A supramolecular constraint is employed order enforce molecular alignment produce arrangement. The internal volume cuboctahedron approximately 30% greater than that Furthermore, stark contrast icosahedral Platonic...

Isostructural species are found in the solid state for supramolecular 1:2 complexes of a calix[6]arene molecule and either C60 or C70 (see structure [(calix[6]arene)(C60 )2 ] complex on right). The calixarene assumes double-cone conformation, overall is result complementarity building blocks with respect to size form-in other words, shallow cavity fullerene surface have similar curvatures.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParamagnetic Bis(1,4-di-tert-butyl-1,4-diazabutadiene) Adducts of Lithium, Magnesium, and ZincMichael G. Gardiner, Graeme R. Hanson, Mark J. Henderson, Fu Chin Lee, Colin L. RastonCite this: Inorg. Chem. 1994, 33, 11, 2456–2461Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 1994https://pubs.acs.org/doi/10.1021/ic00089a024https://doi.org/10.1021/ic00089a024research-articleACS PublicationsRequest...

The crystal structure of the copper(I) iodide pyridine adduct has been determined by X-ray diffraction at 295 K and refined least squares to R 0.057 for 2 710 'observed' reflections. Crystals are orthorhombic, space group P212121, with a= 16.032(6), b= 15.510(2), c= 11.756(3)Å. asymmetric unit is Cu4I4py4, based on well-known tetrahedral tetrameric Cu4I4 unit, Cu–N 2.04, Cu–I 2.70, Cu–Cu 2.69 Å; latter distance much shorter than in analogous complexes formed phosphine arsine ligands.

The effect of para-substituents on the crystal packing phenols has been investigated, for systems bearing nonpolar groups (tert-butyl and benzyl, compounds 1 2, respectively) methylene linked bis-phenol polar nitro (compound 3). Remarkable asymmetric unit six molecules, which form infinite helical hydrogen bonded arrays in extended structures, whereas compound 3 coplanar with phenol rings forms almost columnar arrays. Hirshfeld surface analysis is used to show that despite a nearly identical...

A phosphine-free selenium nanocrystal precursor solution has been synthesized by heating elemental powder in 1-octadecene (ODE). This mixture was characterized UV−vis absorption, photoluminescence excitation (PLE), nuclear magnetic resonance (NMR), Se X-ray absorption spectroscopy (Se-XAS), electron impact mass spectrometry (EIMS), and inductively coupled plasma atomic emission (ICP-AES) to establish identifiable spectroscopic chemical signatures that can be correlated the efficacy of for...

Localized surface plasmon resonances of various metal nanoparticles are used as wavelength specific backscattering light filters. Placing spheroidal silver and gold nanorods around microalgal culture flasks increased the formation photopigments in Chlorella vulgaris cells by such spectral regions favourable for growth.