Materials Literature
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Abstract Electron absorption, excitation and emission spectra have been measured for Cr 3+ ion‐doped NaMg 3 Al(MoO 4 ) 5 crystal in the temperature range from 9 to 300 K. The sharp lines of the 2 E– 4 T 2 emission and broadband 4 T 2 – 4 A 2 luminescence from strong and weak crystal field Cr 3+ sites as well as their…
Hydroformylation of 6-methoxy-2-vinylnaphthalene (MVN), using homogeneous Rh(CO) 2 (acac) as a catalyst and a chelating bidentate ligand (1,2-bis-(diphenylphosphino) ethane, dppe), followed by oxidation of the product (2-(6-methoxynaphthyl) propanal, 2-MNP) has been studied as an alternative route for the synthesis of…
Negatively charged sodium auride clusters, NanAun- (n = 1-3), have been investigated experimentally using photoelectron spectroscopy and ab initio calculations. Well-resolved electronic transitions were observed in the photoelectron spectra of NanAun- (n = 1-3) at several photon energies. Very large band gaps were obs…
A semiconductive charge-transfer solid was prepared by the reaction of cytosine and TCNQ. Cytosine molecules formed a hemiprotonated cytosine pair by complementary triple hydrogen bonds, and the pairs were then linked by complementary double hydrogen bonds to form infinite ribbons. TCNQ molecules formed uniform segreg…
The authors have reported the electrical conductivity and the conductivity relaxation in mixed alkali tellurite glasses of compositions of 70TeO2-xNa2O-(30-x)Li2O in the frequency range from 10 Hz to 2 MHz and in the temperature range from room temperature to just below the glass transition temperature. They have anal…
A new, entirely aqueous method for the deposition of ferroelectric lanthanum substituted bismuth titanate including cosubstitution of Ti 4+ with higher valent metal ions (W 6+, Mo 6+, Nb 5+, and V 5+ ) is presented. The strong tendency toward hydrolysis and condensation of highly valent metal ions, causing precipitati…
The authors report the first theoretical study on the hexa-atomic molecules CAl(4)X (X=Si,Ge) at the B3LYP/6-311++G(2d), MP2/6-311++G(2d), and CCSD(T)/6-311++G(3df) (single point) levels. Three low-lying isomers (within 2.0 kcal/mol) can be formally viewed as constructed by one Al+ interacting with the planar CAl3X- a…
A detailed characterization of platinum- and gold-diamondlike carbon (DLC) nanocomposite films deposited onto silicon substrates is presented. A modified pulsed laser deposition (PLD) technique was used to incorporate noble metal nanoclusters into hydrogen-free DLC films. Several analytical techniques, including trans…
Abstract Raman and photoluminescence of CdS nanowires of diameter 80 nm and lengths up to several tens of micrometers were studied at pressure up to 60 kbar using a Jobin‐Yvon T64000 micro‐Raman system in conjunction with the diamond‐anvil cell technique. The phase transition pressure of wurtzite to rock salt was obse…
One layer at a time: The sequential pulsed-laser deposition of CaO rock-salt and CaMnO3 perovskite layers on an SrTiO3 substrate allows the growth of the metastable n=4, 5, and 6 members of the Can+1MnnO3n+1 Ruddlesden–Popper series (see high-resolution TEM image of Ca5Mn4O13). The growth process is monitored using re…
A series of copper(II) salen complexes containing 4-substituted alkoxy chains of aromatic rings [Cu((4-C n H2n+1O)2salen)] (n = 3 ( 1 ), 4 ( 2 ), 6 ( 3 ), 8 ( 4 ), 10 ( 5 ), 12 ( 6 ), 14 ( 7 ), 16 ( 8 ), 18 ( 9 ), and 20 ( 10 ) and salen (N,N'-ethylenebis(salicylideneiminato)) has been prepared, and single-crystal str…
A tactic-al approach: By use of gold chemistry the first organic–inorganic polymer with a heterotactic architecture has been synthesized, and has enabled the first direct structural comparison of coordination polymers with isotactic, syndiotactic, and heterotactic architectures (see picture: naphthyl groups green, 4,4…
$\mathrm{Re}\mathrm{Ti}{\mathrm{O}}_{3+\ensuremath{\delta}∕2}$ ($\mathrm{Re}=\mathrm{La}$ and Nd) thin films have been deposited on $(100)\mathrm{La}\mathrm{Al}{\mathrm{O}}_{3}$ substrates using the pulsed laser deposition technique. The oxygen content in the formula can be tuned to some extent by carefully adjusting…
In continuation with our work on liquid crystals with unconventional molecular structures, two homologous series that have 1,4-disubstitution and 1,3,4-trisubstitution in the central phenyl ring, such as 2[(4-n-alkoxy-benzyloxy) phenyl azomethine]-5-methyl thiazole and 2-[(4-n-alkoxy-benzyloxy)-2-hydroxy salicyladimin…
The surface relaxations of the rutile $\mathrm{Ti}{\mathrm{O}}_{2}(110)(1\ifmmode\times\else\texttimes\fi{}1)$ clean surface have been determined by $\mathrm{O}\phantom{\rule{0.2em}{0ex}}1\phantom{\rule{0.3em}{0ex}}\mathrm{s}$ and $\mathrm{Ti}\phantom{\rule{0.2em}{0ex}}2{p}_{3∕2}$ scanned-energy mode photoelectron dif…
Novel palladium(II) complexes with bis(pyrazol-1-yl)methane ligands at the focal point of G0-G3 poly(aryl ether) Fréchet-type dendrons are reported. The molecular structures of the metallodendrimer series G0, G1, and G2 [(dend)CH(3,5-Me2pz)2(PdCl2)] have been determined by X-ray diffraction methods. The three structur…
A novel dimeric MnII complex {[Mn(N3O2)]Cl(OH2)}(2)2Cl (2) of a macrocyclic Schiff base ligand derived from the condensation of 2,2',6,6'-tetraacetyl-4,4'-bipyridine with 3,6-dioxaoctane-1,8-diamine in the presence of a stoichiometric amount of MnII has been prepared and characterized. The X-ray analysis of 2 reveals…
X-ray standing wave fields, excited in periodic nanostructured multilayers during Bragg diffraction, have been used to probe atomic migration in multilayers. Ion beam induced migration of Fe impurity atoms from the C layers to the Pt layers in a Pt(Fe)/C(Fe) multilayer, where each layer is about 2 nm thick, has been d…
In April 1991 the Commission on Aperiodic Crystals [1] adopted the following definition of a crystal:“[In the following] by ‘crystal’ we mean any solid having an essentially discrete diffraction diagram , [and by ‘aperiodic crystal’ we mean any crystal in which three-dimensional lattice periodicity can be considered t…
Poly(DL-lactic-co-glycolic acid) microspheres are prepared using a double-emulsion technique and are loaded with the model enzyme horseradish peroxidase (HRP). These microspheres can be used alone or as coatings for bioresorbable fibers that may be used as scaffolds for tissue regeneration applications. The present st…