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 increasing interest in designing polymeric compounds has focused this work on the synthesis and magnetostructural characterization of three 1-D compounds of general formula [M(NCS)2bpa2] [M = Fe, Co, Ni and bpa = 1,2-bis(4-pyridyl)ethane] which exhibit double bpa bridges between metallic cations. X-Ray single crys…
We have studied the coupling of aggregation and crystallization in a mixture of colloidal spheres and colloidal rods. Taking advantage of specially prepared fluorescent silica spheres we are able to investigate this process at the particle level by fluorescense confocal microscopy. We find that above a limiting concen…
A series of D2-symmetric chiral trans-dioxoruthenium(VI) porphyrins can effect enantioselective epoxidation of trans-β-methylstyrene in up to 70% ee, and 76% ee is attained for the oxidation of cinnamyl chloride; the facial selection for the trans-alkenes epoxidation is explained by a ‘head-on approach’ model.
The diffusion and bonding of NOx (x=1, 2) and Cu2+ species in zeolites are reviewed, based mainly on our own research. The molecular motion of adsorbed NO2 has been examined with EPR in several zeolite samples and analyzed using the slow-motional EPR theory. In X- and Y-type zeolites the broadening of the spectra with…
Polarization and morphological characteristics of thin ZnO films deposited on tin‐coated glass electrodes are presented. The films were obtained at a low temperature by an electrolytic process, where the cathode potential is an important control variable. The process is also promising as an electrochemical doping tech…
Regioregular poly(3-alkoxy-4-methylthiophene)s bearing crown ethers of different sizes (12-crown-4), PT12C4; and (15-crown-5) PT15C5) have been synthesized and their thermochromic and ionochromic behaviors investigated. These polythiophene derivatives exhibit a highly conjugated form in the solid state at room tempera…
Template directed reaction of dialdehydes and (R,R)- or (S,S)-1,2-diaminocyclohexane affords a practical route to chiral, metal-free macrocyclic salen dimers which have a novel calixarene-like structure and show catalytic activity for enantioselective epoxidation of unfunctionalized alkenes in the presence of MnIII–Na…
The infrared reflectivity of a ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ single crystal is studied over a broad range of temperatures (78--340 K), magnetic fields (0--16 T), and wave numbers $(20--9000{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}).$ The optical conductivity gradually changes from a Drude…
On the origin of the non-exponential behaviour of the -relaxation in glass-forming polymers: incoherent neutron scattering and dielectric relaxation results , J Colmenero, A Arbe, A Alegría, M Monkenbusch, D Richter
Nanoscale materials created from boron nitride (BN) by arc discharge between ZrB 2 electrodes in an N 2 atmosphere have been investigated by electron microscopy. BN nanotubes were formed together with Zr-compound nanoparticles encapsulated in BN cages. Most of the tubes were multilayered and had diameters from 3 to 40…
Monodisperse oligo(para-phenyleneethynylene)s (oligoPPEs) were synthesized by a divergent-convergent synthesis starting from 1,4-dihexyl-2-(3-hydroxyprop-1-ynyl)-5-[2-(triisopropylsilyl)ethynyl]benzene and using the Pd/Cu-catalyzed alkyne-aryl coupling. The groups hydroxymethyl (HOM) and triisopropylsilyl (TIPS) funct…
Dimethyldodecylammonium chloride functionalized poly(propylene imine) generation 3 dendrimers have been synthesized and proven to have strong antibacterial properties.
The first synthesis and Z-scan measurements of an octupolar polymer with off-resonant third order nonlinear optical properties are discussed; two other new molecular thiophene-based octupoles with similar nonlinearities are also reported.
The current provisions for determination of the upward temperature shift of the lower-bound static fracture toughness curve due to irradiation of reactor pressure vessel steels are based on the assumption that they are the same as the Charpy 41-J shifts as a consequence of irradiation. The objective of this paper is t…
Urea-functionalized dendrimers are prepared which show very efficient phase transfer, in particular of the diagnostically relevant anions pertechnetate, perrhenate and ATP; the extractability rates are evaluated quantitatively by tracer methods; their pH dependancy allows controlled release of guest molecules from the…
The synthesis, characterisation (XRD, DTA, IR, UV-Vis) and magnetic properties of the layered compound Co 5 (OH) 8 (O 2 CC 4 H 8 CO 2 )·5H 2 O are reported. It is characterised by a triangular magnetic lattice with a metal–metal distance of 3.1 Å and an interlayer distance of 14.3 Å. The layers are bridged through the…
The synthesis and characterization of a series of p-phenyleneethynylene oligomers that contain the 2,2′-bipyridine-5,5′-diyl moiety is reported; metallation of the oligomers with ReI(CO)5Cl and Ru(bpy)2Cl2 yields the corresponding (L)Re(CO)3Cl and (L)Ru(bpy)22+ complexes.
The reaction between yttrium nitrate pentahydrate and the sodium salt of allyl acetatoacetate afforded nonanuclear cluster anions [Y9(µ4-O)2(µ3-OH)8{MeC(O)CHC(O)Z}16]–, the functional group Z being the initial allyl one OCH2CHCH2 or an ethoxide depending on the experimental conditions.
The non-crystallographic symmetry of d-dimensional (dD) quasiperiodic structures is incompatible with lattice periodicity in dD physical space. However, dD quasiperiodic structures can be described as irrational sections of nD (n > d) periodic hypercrystal structures. By appropriate oblique projection of particular hy…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTComment on "Direct Observation of a Metastable Solid Phase of Mg/Al/CO3-Layered Double Hydroxide by Means of High-Temperature in Situ Powder XRD and DTA/TG"1Vicente RivesView Author Information Departamento de Química Inorgánica Universidad de Salamanca, Salamanca, Spain Cite t…