Quantum dot nanoparticles affect the reproductive system of Caenorhabditis elegans.

Quantum dots (QDs) are an increasingly important class of nanoparticle, but little ecotoxicological data for QDs has been published to date. The effects of mercaptosuccinic acid (MSA)-capped QDs (QDs-MSA) and equivalent concentrations of cadmium (Cd) from cadmium chloride on growth and reproduction of the nematode Caenorhabditis elegans (Rhabditidae) were assessed in laboratory experiments. Growth from larvae to adults of C.

Synthesis and Size Dependent Reflectance Study of Water Soluble SnS Nanoparticles.

Near-monodispersed water soluble SnS nanoparticles in the diameter range of 3-6 nm are synthesized by a facile, solution based one-step approach using ethanolamine ligands. The optimal amount of triethanolamine is investigated. The effect of further heat treatment on the size of these SnS nanoparticles is discussed.

Quantum dot transport in soil, plants, and insects.

Environmental risk assessment of nanomaterials requires information not only on their toxicity to non-target organisms, but also on their potential exposure pathways. Here we report on the transport and fate of quantum dots (QDs) in the total environment: from soils, through their uptake into plants, to their passage through insects following ingestion. Our QDs are nanoparticles with an average particle size of 6.

Ligand-functionalised copper(II) hydroxide for quantum dot photoluminescence quenching.

The preparation of ligand-functionalised copper(II) hydroxide (Cu(OH)(2)) particles and their conjugation with hydrophobic CdSeS quantum dots (QDs) is reported. The photoluminescence of the QDs is efficiently quenched upon their conjugation with the functionalised Cu(OH)(2) particles. Cu(OH)(2) was functionalised with 2,2'-dipyridyl (2,2-bipy) and n-octanoic acid (OcA), by adsorption of the desired ligand to Cu(OH)(2) suspended in solvent.

Synthesis of SnS quantum dots.

Highly mondispersed SnS nanocrystals have been synthesized using ethanolamine ligands. SnS nanocrystals are small enough to be in the quantum confinement regime.

Attenuated total reflection infrared studies of oleate and trioctylphosphine oxide ligand adsorption and exchange reactions on CdS quantum dot films.

Ligand exchange reactions at the surface of oleate- and trioctylphosphine oxide (TOPO)-capped CdS quantum dots have been studied with attenuated total reflection infrared (ATR-IR) spectroscopy, using thin films deposited from organic solvent suspensions. The oleate and trioctylphosphine capping ligands were found to form highly ordered and densely packed monolayers on the CdS surface. Adsorbed oleate is coordinated to CdS in a chelating bidentate manner through the carboxylate functional group, while adsorbed trioctylphosphine oxide is coordinated though the P=O functional group and appears to have numerous adsorption environments on the CdS surface.

Three-in-one: the novel packing and structures of three independent molecules of a tricyclic boron compound.

The three independent molecules in a single crystal of the tricyclic compound 15-[3-(dimethylamino)propoxy]-5,5,13,13-tetramethyl-1,7,9,14,16-pentaoxa-5,13-diazonia-15-bora-6,8-diboratadispiro[5.1.5.

Unprecedented oxo-titanium citrate complex precipitated from aqueous citrate solutions, exhibiting a novel bilayered Ti8O10 structural core.

Aqueous titanium citrate solutions were prepared from the reaction of citric acid with titanium 2-propoxide in a range of molar ratios. Solutions containing two or fewer citrates per titanium resulted in the slow crystallization of an insoluble titanium oxo-citrate complex. Single-crystal X-ray analysis identified the species as Ti(8)O(10)(citrate)(4)(H(2)O)(12).

An oxo-bridged centrosymmetric tetranuclear titanium compound.

The title compound, octa-tert-butoxybis[micro(3)-2,2'-(N-methylimino)diethanolato]di-micro-oxo-tetratitanium(IV), [Ti(2)O[(OCH(2)CH(2))(2)(NCH(3))][(CH(3))(3)CO](4)](2) or [Ti(4)(C(5)H(11)NO(2))(2)(C(4)H(9)O)(8)O(2)], lies about an inversion centre, and displays the less usual zigzag configuration. One O atom of the N-methyldiethoxoamine ligand bridges the symmetry-related Ti atoms, while the other bridges the two independent Ti atoms, with the N atom binding to give a facial configuration. Four (t)BuO(-) ligands and a bridging oxide complete the respective five- and sixfold coordination of the two Ti atoms.

A novel titanium-mu-O-zirconium complex: bis(mu-methyliminodiethanolato-1kappa(3)O,N,O';1:2kappa(2)O)(methyliminodiethanolato-2kappa(3)O,N,O')dipropanolato-1kappaO,2kappaO-titanium(IV)zirconium(IV).

The title compound, [TiZr(C(5)H(11)NO(2))(3)(C(3)H(7)O)(2)], contains three methyliminodiethanolate ligands, two in different mu-oxo bridging coordination modes and one bound only to the Ti atom. The Ti and Zr atoms have distorted octahedral and pentagonal-bipyramidal coordinations, respectively, which share edges. As well as some conformational disorder in the carbon chains, there is chemical disorder at one Ti site, with a mix of n- and isopropanolate ligands.