Materials Literature
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Hydrotalcite-like compounds containing Mg(II) and Cr(III) or Ni(II) and Cr(III) cations in the brucite-like layers have been synthesized by the coprecipitation method. The layered structure has been confirmed by Powder X-ray diffraction, and characterization has been completed by elemental chemical analysis, FT-IR and…
In this paper we report a comparative experimental thermochemical and ab initio quantum chemical study of metal−ligand bonding and bonding energetics in the group 3, lanthanide, group 4, and group 5 zerovalent bis(arene) sandwich complexes Sc(TTB) 2 ( 1 ) Y(TTB) 2 ( 2 ), Gd(TTB) 2 ( 3 ), Dy(TTB) 2 ( 4 ), Ho(TTB) 2 ( 5…
The heterobimetallic one-dimensional arrays {(DMF) 4 EuNi(CN) 4 } ∞ and {(DMF) 4 EuPt(CN) 4 } ∞ were prepared from the metathesis of (NH 3 ) x EuCl 2 with K 2 Ni(CN) 4 and K 2 Pt(CN) 4, respectively, in DMF. The analogous reaction between (NH 3 ) x YbCl 2 and K 2 Ni(CN) 4 in DMF or DMA resulted in oxidation of Yb 2+ a…
The performance of several different two-dimensional NMR methods for the measurement of carbon−proton dipolar couplings in liquid crystalline phases is analyzed. Proton-detected local field spectroscopy allows the measurements of short range C−H couplings, which correspond to directly bond pairs, by direct inspection…
Contact-angle measurements, the ASTM standard wetting test for polyolefin films, and X-ray photoelectron spectroscopy (XPS or ESCA) were used to characterize flame-treated polypropylene (PP) films. Two combustion models, STANJAN and PREMIX, were then used to determine the chemical and physical properties of the flames…
Fumarase C catalyzes the stereospecific interconversion of fumarate to L-malate as part of the metabolic citric acid or Kreb's cycle. The recent three-dimensional structure of fumarase C from Escherichia coli has identified a binding site for anions which is generated by side chains from three of the four subunits wit…
The electrochemical properties of poly(3,4-ethylenedioxythiophene) are studied using the bending beam method to detect volume changes during electrochemical transformations of the material. Thin films of poly(3,4-ethylenedioxythiophene) immersed in different supporting electrolytes first contract very rapidly and then…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCationic Manganese(I) Dihydrogen and Dinitrogen Complexes Derived from a Formally 16-Electron Complex with a Bis-Agostic Interaction, [Mn(CO)(Ph2PC2H4PPh2)2]+Wayne A. King, Xiao-Liang Luo, Brian L. Scott, Gregory J. Kubas, and Kurt W. ZilmView Author Information Los Al…
The 7-fold mutation Cys201Met/Cys332Tyr/Lys344Asp/Tyr345Ile/Val35 1Ala/Tyr391Lys/Arg395Ser converts the cofactor specificity of Escherichia coli isocitrate dehydrogenase from a 7000-fold preference for NADP+ to a 200-fold preference for NAD+, with overall activity comparable to that of wild-type NAD+-dependent isocitr…
Ethlene preferentially attacks the oxygen closest to the titanium in HOO–Ti(OSiH3)3(MeOH) and HOO–TiL3(MeOH) cluster models of the active Ti-site in TS1 due to a substantially reduced electrostatic repulsion.
The magnetic behavior of the clusters [(PhSiO(2))(6)Cu(6)(O(2)SiPh)(6)].6EtOH (1), Na(4)[(PhSiO(2))(12)Cu(4)].8(n)()BuOH (2), and K(4)[(C(2)H(3)SiO(2))(12)Cu(4)].6(n)()BuOH (3) has been investigated by combined magnetic susceptibility measurements and variable-temperature EPR techniques (9.25 and 245 GHz). The six cop…
A systematic study of the properties and reactivities of iron(III) porphyrin peroxo complexes containing ligands with different electronic properties has been undertaken. While the spectral properties of the peroxo complexes do not show much variation, the stability of the complexes is dramatically increased by employ…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHeterocyclic Betaines Exhibiting Extremely Large First Hyperpolarizability: Ab Initio and INDO/S CalculationsJiro Abe and Yasuo ShiraiView Author Information Department of Photo-Optical Engineering Faculty of Engineering, Tokyo Institute of Polytechnics Iiyama 1583, At…
A number of cationic chromophores derived from the stilbazolium skeleton have been synthesized and inserted into the transparent layered MPS 3 compounds (M = Mn, Cd, Zn). The NLO properties of the intercalates have been studied. Some of the materials are found to be active for second harmonic generation. UV−visible sp…
The nonresonance Raman spectrum of free base porphine has been measured using near infrared excitation. The observed frequencies and intensities are compared with results from the scaled quantum mechanical (SQM) force field presented in part I. The SQM force field is based on density functional calculations, scaled to…
In this study we attempted to develop a novel drug delivery system in the form of polymeric micelles. In order to obtain polymer chains with micelle forming abilities, we have proposed to produce copolymers by transesterification of poly(DL-lactic acid)(PDLLA)(as the hydrophobic segment) and polyethylene glycol (PEG)…
Samples of silicalite-1 with vanadium ions incorporated in stable framework positions (KVS-5) have been synthesized using several different compounds of V. The materials were investigated by XRD, chemical analysis and SEM–EPM techniques and UV–VIS, EPR, NMR, IR and Raman spectroscopy. One group of the samples containe…
We have measured the pressure dependence of the order−disorder transition temperature ( T ODT ) in two styrene−isoprene diblock copolymers containing 24 and 48 wt % styrene ( M w = 20 500 and 16 500 g mol -1, respectively). Small-angle X-ray scattering measurements indicate that T ODT rises linearly with increasing hy…
The strengthening of the interface between polystyrene (PS) and poly(methyl methacrylate) (PMMA) using a random copolymer P(S f - r -MMA 1 - f ), where f is the fraction of styrene in the copolymer, was investigated. The maximal fracture toughness, measured by crack propagation, was found when f = 0.68. Neutron reflec…
Plasma polymers of acrylic (propenoic) acid and propanoic acid were prepared from inductively coupled, radio-frequency-induced plasmas excited in vapors of the starting materials. The plasma polymers were characterized by X-ray photoelectron spectroscopy (XPS), infrared reflection absorption spectroscopy (IRAS), and s…