Materials Literature
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A number of thermally and optically stable, bis-dipolar chiral molecules based on two geometries of the binaphthol (BN) system with different acceptors/substituents have been synthesized for the first time, and the synthetic routes are reported: optically pure 6,6‘-disubstituted 2,2‘-diethoxy-1,1‘-binaphthyls {R, R‘=…
Femtosecond dynamics of the photochromic reaction of a thiophene oligomer with a diarylethene structure in solution was analyzed by transient absorption spectroscopy. It was found that the intermediate species with an absorption maximum at ∼515 nm was formed within 100 fs and that the closed-ring form of the thiophene…
Extracellular poly(3-hydroxybutyrate)(PHB)-depolymerases A and B were purified from the culture medium of succinate-grown cells of Pseudomonas lemoignei by ammonium sulfate precipitation and chromatography on CM Sepharose CL-6B. The relative molecular weights of the sodium dodecyl sulfate (SDS)-treated enzymes were es…
Measurements of the rotational and translational motion of several probe molecules in supercooled 1,3-bis(1-naphthyl)-5-(2-naphthyl)benzene (ααβ-TNB) are reported. Rotational correlation times from 10 -10 to 10 3 s were measured in the temperature range from 341 to 515 K ( T g = 343.5 K). Translational diffusion coeff…
The crystal structure and magnetic properties of the molecular-based ferrimagnet N(n-C5H11)4MnIIFeIII(C2O4)3 have been determined. The compound is orthorhombic, space group C2221, a= 9.707(3), b= 16.140(3), c= 19.883(7)Å(120 K), Z= 4[R 0.047 for I > 2σ(I)]. The structure consists of hexagonal layers of alternating MnI…
P. G. Sammes and G. Yahioglu, Nat. Prod. Rep., 1996, 13, 1 DOI: 10.1039/NP9961300001
We have measured polarized resonance Raman spectra of nickel(II) octaethylporphyrin in CS 2 and CH 2 Cl 2 solution at different excitation wavelengths (430−580 nm) and temperatures (190−310 K). The analysis of the spectra revealed that the structure-sensitive Raman lines ν 19 and ν 10 can be decomposed consistently in…
Hydrothermal reaction of tungstic acid, molybdic acid, and vanadium pentoxide with the surfactant template dodecyltrimethylammonium bromide (DTABr) yielded one compound with a Keggin type structure, [C 12 H 25 N(CH 3 ) 3 ] 6 (H 2 W 12 O 40 )· x H 2 O, and two new layered compounds, [C 12 H 25 N(CH 3 ) 3 ] 0.5 (MoO 3.2…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBinding of Porphyrins in Cyclodextrin DimersFokke Venema, Alan E. Rowan, and Roeland J. M. NolteView Author Information Department of Organic Chemistry, NSR Center University of Nijmegen, Toernooiveld 6525 ED Nijmegen, The Netherlands Cite this: J. Am. Chem. Soc. 1996,…
Surface morphology and growth kinetics of thaumatin crystals in the supersaturation range σ = 0−1.65 were investigated using in situ atomic force microscopy (AFM). At σ < 0.7 growth steps were produced both by screw dislocations and two-dimensional nuclei. At higher supersaturations growth proceeded exclusively by two…
Lamellar single crystals of both natural poly[( R )-β-hydroxybutyrate], PHB, and synthetic poly[( R, S )-β-hydroxybutyrate] of various tacticities were degraded using enzymes isolated from the fungus Aspergillus fumigatus and the bacterium Pseudomonas lemoignei . Degradation was monitored by both turbidimetric and tit…
Three triaminotriazine units bearing two appended porphyrins undergo self-assembly through multiple hydrogen-bonding with three complementary dialkylbarbituric acids yielding a supramolecular macrocycle containing six porphyrins.
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAryl Ether Dendrimers with an Interior Metalloporphyrin Functionality as a Spectroscopic Probe: Interpenetrating Interaction with Dendritic ImidazolesYoriko Tomoyose, Dong-Lin Jiang, Ren-Hua Jin, Takuzo Aida, Takashi Yamashita, Kazu…
A hexagonal mesoporous phase based on SnO2 is synthesized for the first time by using an anionic surfactant; hexagonal phases of TiO2 are prepared with neutral amine surfactants.
An iron(II) porphyrin 1-methylimidazole (mim) complex covalently encapsulated within a large aryl ether dendritic cage, FeII(mim)2L5, displays reversible dioxygen-binding activity, in which the dioxygen adduct survives over a period of months even in the presence of water, and exhibits a half-life of 50 h upon exposur…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTInter- and Intralayer Energy Transfer in Zirconium Phosphate−Poly(allylamine hydrochloride) Multilayers: An Efficient Photon Antenna and a Spectroscopic Ruler for Self-Assembled Thin FilmsDavid M. Kaschak and Thomas E. MalloukView Author Information Department of Chemi…
An aluminium-based dodecyl sulfate mesophase with a hexagonal structure is synthesized by the homogeneous precipitation method using urea and is thermally deorganized into a hexagonal but less ordered framework structure with a d spacing of 3.4 nm.
A set of α-coupled oligothiophenes, dimer through hexamer, was studied. Each oligomer was terminated with two methyl groups and was substituted with two or four methoxy groups. Electrochemical studies showed that methoxy groups substituted at “inside” β-positions on the terminal rings (positions toward the center of t…
The structures of the transition states and intermediates formed in the water-exchange of hexaaqua complexes of the first row transition elements have been computed with ab initio methods at the Hartree−Fock or CAS-SCF level. As an approximation, water molecules in the second coordination sphere except one, bulk water…
Biological mineralization leads to the development of finely scaled, highly controlled inorganic precipitates in organic matrixes. It was initially thought that this control was mainly exercised through lattice-matching epitaxy between the protein or polysaccharide matrix and the mineral. We discuss the importance of…