Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The liquid-crystal templating approach for the synthesis of mesostructured materials was extended to aluminophosphates. A variety of lamellar AlPO 4 phases with d spacings in the nanometer range were prepared in the presence of long-chain primary and tertiary amines. A systematic study of the influence of the gel comp…
Organic−inorganic interpenetrating polymer networks were synthesized with an SiO 2 phase made by sol−gel chemistry and the organic phase made from poly(2-hydroxyethyl acrylate). The resultant morphologies were characterized by small-angle scattering and electron microscopy. When the vinyl polymerization is more rapid…
The design, structure, and properties of supramolecular liquid-crystalline side-chain polymers are described. In particular, we show how several simple H-bonding building blocks can be used for the formation of various liquid-crystalline structures. Poly[4-(6-(acryloyloxy)hexyl- and -undecyloxy)benzoic acid] (P m OBA;…
The importance of appropriate chemical substitution in generating co-crystals of some dinitrobenzoic acids and anthracene from solution and by solid-state grinding is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFacile Preparation of Face Differentiated, Chiral 15-Metallacrown-5 ComplexesAnn J. Stemmler, Almut Barwinski, Michael J. Baldwin, Victor Young, and Vincent L. PecoraroView Author Information Departments of Chemistry The University of Michigan Ann Arbor, Michigan 48109…
Highly organized monolayers formed from the self-assembly of octadecyl derivatives on oxide-covered Si and Ti substrates have been exposed to electron beam impact under typical conditions used in lithographic patterning. A combination of X-ray photoelectron spectroscopy, ellipsometry, infrared spectroscopy, and liquid…
A novel class of tetranuclear silver(I) clusters containing an unsubstituted quadruply bridging chalcogenide, [Ag4(μ-dppm)4(μ4-E)](OTf)2 [E = S (1), Se (2), Te (3)], have been synthesized and characterized by X-ray crystallography. The clusters have been shown to possess rich photophysical properties. It is suggested…
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…