Materials Literature
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A self-assembled trimeric ring-shaped aggregate of an aluminium(III) porphyrin bearing a benzoic acid in one meso-position has been characterized by NMR-spectroscopy and MALDI-TOF spectrometry.
The origin of the intriguing spin-transition behavior of the Prussian blue analogue cesium iron hexacyanochromate CsFe[Cr(CN)6] has been investigated by means of correlated ab initio CASPT2 calculations. Using the smallest transiting core [Fe(NC)6]4-, the relative importance of the local ligand field and the Madelung…
Production of hydrogen from natural gas is the most cost-effective and simplest technology for commercial hydrogen generation. Natural gas is also a likely source of hydrogen for residential fuel cell systems, due to its wide availability and ease of conversion via steam methane reforming. Although catalyst technology…
Hornet silk, a fibrous protein in the cocoon produced by the larva of the vespa, is composed of four major proteins. In this study, we constructed silk-gland cDNA libraries from larvae of the hornet Vespa simillima xanthoptera Cameron and deduced the full amino acid sequences of the four hornet silk proteins, which we…
A broad range of applications requires access to porphyrins that are compact, water-soluble, and bioconjugatable. A symmetrically branched hydrocarbon chain ('swallowtail') bearing polar end groups imparts high (>10 mM) aqueous solubility upon incorporation at one of the meso positions of a trans-AB-porphyrin. Two suc…
Understanding the synthesis of periodic mesoporous silica (PMS) is crucial for a more efficient use of these materials and is a necessary first step toward a rational design strategy for the templated synthesis of porous solids. In this paper, the early stages of the synthesis process of PMS materials are simulated di…
The experimental creation and annihilation of defects on single-walled carbon nanotubes (SWCNT) with the tip of a scanning tunneling microscope are reported. The technique used to manipulate the wall structure of a nanotube at the atomic scale consists of a voltage ramp applied at constant tunneling current between th…
We simulate the rise of Newtonian drops in a nematic liquid crystal parallel to the far-field molecular orientation. The moving interface is computed in a diffuse-interface framework, and the anisotropic rheology of the liquid crystal is represented by the Leslie–Ericksen theory, regularized to permit topological defe…
The complete reversible phase transfer of TGA-capped CdTe NCs between aqueous and chloroform in the presence of 1-hexadecylamine (HDA) is demonstrated. It was found that the primary amine HDA is crucial in initiating the reversible phase transfer. FTIR measurements suggest that the phase transfer reversibility results…
Reversible polarity-dependent resistance (PDR) switching in phase-change (PC) films is feasible. Nanometer-scale crystalline marks are produced in amorphous Ge2Sb2+xTe5 films by electrical pulses through an AFM tip. In these marks, PDR switching is demonstrated with three orders of magnitude current contrast using les…
The evolution of chemical composition and structure during the thermal imidization of an ester-type polyimide precursor, poly(4,4'-oxydiphenylene p-pyromellitamic diethyl ester), in micrometer scale films were studied for a heating rate of 2.0 degrees C/min with time-resolved synchrotron X-ray diffraction, in-situ inf…
The complexes [Ru((t)Bu(2)bipy)(bpym)X(2)] (X = Cl, NCS) and [M((t)Bu(2)bipy)(2)(bpym)][PF(6)](2) (M = Ru, Os) all have a low-energy LUMO arising from the presence of a 2,2'-bipyrimidine ligand, and consequently have lower-energy (1)MLCT and (3)MLCT states than analogous complexes of bipyridine. The vacant site of the…
Lanthanide complexes of the chiral Dawson phosphotungstate [alpha(1)-P(2)W(17)O(61)](10-) were used to study the formation of diastereomers with optically pure organic ligands. The present work started with the full assignment of the (183)W NMR spectra of [alpha(1)-Yb(H(2)O)(4)P(2)W(17)O(61)](7-) at different temperat…
We demonstrate reversible quenching of the photoluminescence from single CdSe/ZnS colloidal quantum dots embedded in thin films of the molecular organic semiconductor N,N'-diphenyl-N,N'-bis(3-methylphenyl)-(1,1'-biphenyl)-4,4'-diamine (TPD) in a layered device structure. Our analysis, based on current and charge carri…
Covalent sidewall addition to single-walled nanotubes (SWNTs) of a series of organolithium and organomagnesium compounds (nBuLi, tBuLi, EtLi, nHexLi, nBuMgCl, tBuMgCl) followed by reoxidation is reported. The functionalized R(n)-SWNTs were characterized by Raman and NIR emission spectroscopy. The reaction of SWNTs wit…
Abstract The photoconductivity of solution‐cast Zn 1–x Mg x O (x=0‐0.4) and poly(3‐hexylthiophene) (P3HT) thin films, and Zn 1‐ x Mg x O/P3HT bilayers is investigated using Time‐Resolved Microwave Conductivity (TRMC) with the aim of determining the locus of free charge carrier generation in the bilayer system. The pho…
Abstract Tetranuclear lanthanide aqua hydroxo complexes with two structural types of core – {Ln 4 (μ 3 ‐OH) 4 (μ 2 ‐OH) 4 } 4+ [Ln = Pr ( 1 ), Nd ( 2 ), Eu ( 3 ), Gd ( 4 ), Tb ( 5 )] and {Ln 4 (μ 3 ‐OH) 4 (μ 2 ‐OH) 2 } 6+ [Ln = Er ( 6 ), Yb ( 7 )] – were prepared by heating (130 °C) of aqueous solutions of lanthanide(…
A new complex of 4-thiophen-3-yl-pyridine-2,6-bis(oxazoline) with Eu(III) triflate has been isolated. This complex and its Tb(III) analogue are luminescent in the solid state. The complexes dissolve with partial retention of the solid-state structure in acetonitrile to yield highly luminescent solutions with quantum y…
We describe the fabrication of extremely high mass fraction polymer-nanotube composites displaying very high conductivity. Contrary to general expectations, the conductivity displays percolation-like scaling for all mass fractions from 22 % right up to 100 %. These are among the most conductive composites ever demonst…
In this work, a facile method for the preparation of structured and functional polymer grafts on diamond surfaces is described. Uniform poly(styrene) (PS) grafts with a thickness of approximately 110 nm were created directly onto oxidized ultrananocrystalline diamond (UNCD) surfaces by the self-initiated photografting…