Materials Literature
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We studied the evolution of defect lines (oily streaks) in cholesteric liquid crystals. In contrast to nematic liquid crystals, there were no interactions between the defect lines in cholesteric liquid crystals. We observed experimentally that individual open defect segments shrank with time with a linear relation, an…
Single crystals of Sr[C(2)(COO)(2)] were formed at the phase boundary of an aqueous silica gel that contained acetylenedicarboxylic acid and an aqueous solution of SrCl(2). The crystal structure (I4(1)/amd, Z=4) shows a diamond-like topology, with the strontium ions in an eightfold co-ordination by the oxygen atoms of…
Ordered silicas with high loadings of pendant methyl groups were synthesized via cocondensation of tetraethyl orthosilicate and triethoxymethylsilane under basic conditions in the presence of cetyltrimethylammonium surfactant. The resulting materials were characterized using X-ray diffraction (XRD), transmission elect…
Die lineare Korrelation zwischen Fluoreszenzanstieg und Photolysegrad bei der Blitzlichtphotolyse von Bis(carboxymethoxy)cumarinylmethyl-inaktiviertem („caged“) cAMP (1, R=H, R′=NH2) und cGMP (2, R=NH2, R′=OH) ermöglicht die Visualisierung und Quantifizierung des Freisetzungsprozesses der cyclischen Nucleotide innerha…
The reaction of the antiaromatic [28]trithiahexaphyrin (TTHP) with Cu(I) in DMF gives a novel fused-ring trithiahexaphyrin with the elimination of a chloride on a dichlorophenyl ring and bond formation to the outward oriented pyrrolic nitrogen to form a 5,5,6-tricyclic internal ring system. The NMR spectra, which disp…
Shape memory alloys (SMAs) exhibit two very important properties: shape memory phenomenon and superelastic deformation due to intrinsic thermoelastic martensitic transformation. To fully exploit the potential of SMAs in developing functional structures or smart structures in mechanical and biomechanical engineering, i…
A crystallographic mismatch branching mechanism, rather than molecular self-assembly, controls the architecture of the crystalline structure. Self-organized functional materials with a 3D fibrous network structure (see scanning electron micrographs; right) have been constructed from needlelike crystals of lanosterol:d…
Three new tetrathiafulvalene-substituted 2,2'-bipyridine ligands, cis-bpy-TTF(1), trans-bpy-TTF(1), and cis-bpy-TTF(2) have been prepared and characterized. X-ray analysis of trans-bpy-TTF(1) is also reported. Such ligands have been used to prepare two new trinuclear Ru(II) complexes, namely, [[(bpy)(2)Ru(micro-2,3-dp…
Reaction conditions determine the product: The reaction of GdCl3 and pre-formed K[Cu(CN)2] in DMF leads to a lanthanide–transition-metal complex with a layered structure. Treatment of GdCl3 with discrete quantities of CuCN and KCN, however, yields an inclusion complex with [Gd(dmf)8]3+ ions located within “pockets” (s…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEnzymatic Hydrolysis of a Layer-by-Layer Assembly Prepared from Chitosan and Dextran SulfateTakeshi Serizawa, Miyuki Yamaguchi, and Mitsuru AkashiView Author Information Department of Nanostructured and Advanced Materials, Graduate…
Macromolecular crystallization is a complex process, involving a system that typically has five or more components (macromolecule, water, buffer + counterion, and precipitant). Whereas small molecules have only a few contacts in the crystal lattice, macromolecules generally have 10's or even 100's of contacts between…
A novel molecular based proton-electron mixed conductor, (H3BBIM(+))(TCNQ)(Cl(-))(0.5)(H(2)O) (1), where H3BBIM(+) is 2-(2-1H-benzimidazolyl)-1H-benzimidazolium and TCNQ is 7,7,8,8-tetracyano-p-quinodimethane, was synthesized. The salt exhibited peculiar phase transitions as a result of proton-electron coupling phenom…
Single ${\mathrm{Ar}}_{n}$ or $({\mathrm{CO}}_{2}{)}_{n}$ $(n\ensuremath{\simeq}960)$ cluster impacts on a diamond (111) surface are studied by large-scale molecular dynamics simulations in order to investigate highly energetic cluster-surface interactions. For a cluster impact energy ${E}_{a}$ of 100 keV, a hemispher…
The linear correlation between the increase of fluorescence and the extent of photolysis upon flash photolysis of bis(carboxymethoxy)coumarinylmethyl-caged cAMP (1, R=H, R′=NH2) and cGMP (2, R= NH2, R′=OH) allows the visualization and quantification of the release process of the cyclic nucleotides within cells.
Turning off the light. A fluorescence quencher based on azulene was synthesized which absorbs light in the range of 650 to 800 nm. Since protease sensing was possible with the derivative shown (Alexa Fluor 680 is the fluorochrome), applications in vivo for imaging molecular targets can be expected.
Substitutional solid solutions of metal hexacyanometalates in which low-spin iron(III) and cobalt(III) ions populate the carbon-coordinated sites were synthesized and studied by powder diffraction including Rietveld refinement, cyclic voltammetry of immobilized microparticles, diffuse reflection vis-spectrometry, and…
Responsive sensing clusters: By linking {(Mo)Mo5} type building units with different spacers, spherical clusters (nanosponges) having 20 different nanosized and tunable MonOm pores/macrocycles of the type and quality of the classical crown ethers of supramolecular chemistry are formed (see picture of an {Mo9O9}-type h…
The thermal conductivity $\ensuremath{\kappa}$ of the quasi-two-dimensional (Q2D) organic superconductor $\ensuremath{\lambda}\ensuremath{-}(\mathrm{BETS}{)}_{2}{\mathrm{GaCl}}_{4}$ [BETS = bis(ethylenedithio)tetraselenfulvalene] was studied in the magnetic field H applied parallel to the Q2D plane. The phase diagram…
An eosin molecule encapsulated into the dendrimer shown in the picture collects electronic energy from all 64 chromophoric units of the dendrimer, which comprises three different types of chromophore. Efficient intramolecular (within the dendrimer) and intermolecular (dendrimer-host→eosin-guest) energy-transfer proces…
By assembling azulene units (fused pentagon-heptagon pairs) and hexagons, and applying specific wrapping rules to these structures resembling some recently-proposed Haeckelite structures [Terrones et al., Phys. Rev. Lett. 84, 1716 (2000)], a large variety of toroidal, coiled, screwlike, and double-helix structures can…