Materials Literature
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Abstract Emulsion‐polymerized copolymers of methyl methacrylate and N ‐cyclohexylmaleimide were synthesized and used for blending with poly(vinyl chloride) (PVC) to improve the heat resistance of PVC. The thermal stabilities of the blends with different copolymer contents were characterized by thermogravimetric analys…
A range of new functionalised 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene (TTFAQ) derivatives have been synthesised from the key di(halomethyl) building blocks, 10-[4,5-bis(bromomethyl)-1,3-dithiol-2-ylidene]-anthracene-9(10H)-one 10, 10-[4,5-bis(chloromethyl)-1,3-dithiol-2-ylidene]anthracene-9(10H)-one 11…
Abstract The polymerization of norbornadiene (NBD) initiated by the 2‐chloro‐2,4,4‐trimethylpentane/titanium tetrachloride system was investigated. Efforts were made to develop conditions for the living polymerization of NBD by the use of proton trap and electron donor in the −35 to −60 °C range however this objective…
Abstract The relationship between the degree of ester‐interchange reactions and the physical properties in the melt blending of poly(ethylene terephthalate) (PET) and polycaprolactone (PCL) was investigated in terms of the blending time. 1 H‐NMR and 13 C‐NMR spectra confirmed that poly(ethylene terephthalate caprolact…
Measurements of elastic constants of strained 200 and 400 nm thin films, as well as unstrained samples, of the colossal magnetoresistance (CMR) material La0.67Ca0.33MnO3 are presented. Since the peak resistance temperature of a strained CMR film decreases as the film thickness decreases, it is of interest to see if fe…
The helical twisting power of a chiral ruthenium complex Delta-[Ru(acac)2L], in which L (mesogenic ligand) and acac denote 5,5'-(4-octylphenyloxycarbonyl)-2,2'-bipyridyl and acetylacetonate, respectively, was determined to be betaM = -71 and -1.8 x 102 mum-1 in room-temperature nematics ZLI-1132 and MBBA, respectively.
Two new dinucleating ligands 1,2,4,5-tetrakis(2-pyridinecarboxamido)benzene, H(4)(tpb), and 1,2,4,5-tetrakis(4-tert-butyl-2-pyridinecarboxamido)benzene, H(4)(tbpb), have been synthesized, and the following dinuclear cyano complexes of cobalt(III) and iron(III) have been isolated: Na(2)[Co(III)(2)(tpb)(CN)(4)] (1); [N(…
The title compound, a molecule that assembles several moieties on a strategic route to the formation of photoluminescent materials (PL), has been prepared by Suzuki heterocoupling. The molecule consists of a 1,1-dioxothiophene core with hexylic chains in 3,4-position and two 9,9-dimethyl fluorene wings. The dialkyl su…
The level splittings in a dimer with antiferromagnetic coupling between two single-molecule magnets are calculated perturbatively for arbitrary spins. It is found that the exchange interaction between two single-molecule magnets plays an important role in the level splitting. The results are discussed in comparison wi…
Abstract Ultraviolet–visible absorption spectra and photoluminescence spectra were used to demonstrate efficient charge‐carrier migration in a novel bulk heterogeneous block copolymer system. One moiety of the block copolymer was functionalized with charge‐transporting carbazole groups, whereas the other block formed…
A new series of novel isostructural metal chalcogenides, K(2)CuIn(3)Se(6) (1), K(2)CuGa(3)Se(6) (2), and K(2)AgIn(3)Se(6) (3), were obtained by a reactive flux technique and structurally characterized. Compounds 1, 2, and 3 crystallize in the space group C2/c of the monoclinic system with eight formula units in a cell…
SAD (single-wavelength anomalous diffraction) has enormous potential for phasing proteins using only the anomalous signal of the almost ubiquitous native sulfur, but requires extremely precise data. The previously unknown structure of the lima bean trypsin inhibitor (LBTI) was solved using highly redundant data collec…
A straightforward coupling-aminovinylation sequence of terminal alkynes 1, electron-deficient heteroaryl halides 2, and secondary amines 4 furnishes highly solvochromic push-pull chromophores 5 in good yields. Semiempirical calculations (PM3) suggest that the aminovinylation proceeds in a stepwise fashion through a zw…
Four rhenium(IV)-M(II) bimetallic complexes of formula [ReCl(4)(mu-ox)M(dmphen)(2)].CH(3)CN with M = Mn (1), Fe (2), Co (3), and Ni (4) (ox = oxalate anion, dmphen = 2,9-dimethyl-1,10-phenanthroline) have been synthesized and the crystal structures of 1 and 3 determined by single-crystal X-ray diffraction. 1 and 3 are…
Two nitrogen-containing polymers, polyacrylonitrile and poly(styrene- co -acrylonitrile), and three oxygen-containing polymers, poly(vinyl methyl ether), poly(vinyl methyl ketone) and poly(methyl methacrylate), were coated with copper, nickel, and aluminum under ultrahigh vacuum, and their surfaces were analyzed by X-…
Abstract A series of poly(azomethine ester) copolymers were synthesized by the solution polycondensation method with different diamines. The synthesized polymers were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry (DSC), hot‐stage polarized micro…
The interaction of hydrogen with substitutional chalcogen impurities (S, Se, or Te) is investigated by ab initio modeling. In $\mathrm{Se}\ensuremath{-}{\mathrm{H}}_{n}$ and $\mathrm{Te}\ensuremath{-}{\mathrm{H}}_{n}$ complexes $(n=1,2),$ protons are located at sites antibonding to nearest-neighbor silicon atoms. For…
Self-organized growth of calcite crystals in a supersaturated solution with a gradual increase in the influence of silicate anions resulted in the formation of a hierarchical self-similar morphology consisting of three-pointed stars with sizes ranging from 100 nm to 100 micrometer.
The structural phase transition in the orthovanadates ${\mathrm{LaVO}}_{3}$ and ${\mathrm{CeVO}}_{3}$ has been studied with high energy synchrotron x-ray diffraction. ${\mathrm{LaVO}}_{3}$ undergoes a second order phase transition at ${T}_{N}=143\mathrm{K}$ and a first order transition at ${T}_{t}=141\mathrm{K},$ whil…
In this study, characterization and optimization of a modified microbatch crystallization technique has been attempted in order to provide a rapid screening method. Using this method for screening has certain advantages over standard vapour-diffusion methods: no sealing of drops is required, no reservoir solutions are…