Materials Literature
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Ein Metall&ararr;π*(Carben)-Charge-Transfer-Übergang in Lösung bei Raumtemperatur wurde erstmals bei der Titelverbindung nachgewiesen. Dieser ungewöhnliche, sechskernige Platinamakrocyclus entsteht durch Selbstorganisation aus je sechs Dicarben-Platin(II)-Einheiten und Cyanidliganden, wobei die Platinzentren sechs Eck…
The synthesis and characterization of composite inorganic−polyimide films is described by adding diaquotris(2,4-pentanedionato)lanthanum(III) to soluble, low dielectric, colorless polyimides formed from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride/1,3-bis(3-aminophenoxy)benzene (6FDA/APB), and 6FDA/2,2-bi…
Zwei Pyrrolringe sind Bestandteil der aromatischen Struktur von Porphyrin. Daher sollte es eher als 22π-Elektronensystem (siehe rechts) denn als [18]Annulen beschrieben werden. Dagegen bevorzugen sowohl das Dianion als auch die Metallkomplexe grundlegend andere elektronische Strukturen.
Treatment of titanium tetrachloride (2 equiv) with dimethyl diselenide or diethyl diselenide (1 equiv) in hexane at 0 degrees C, followed by crystallization at -20 degrees C, afforded (TiCl(4))(2)(Se(2)(CH(3))(2)) (78%) and (TiCl(4))(2)(Se(2)(CH(2)CH(3))(2)) (63%), respectively, as red and orange crystalline solids. (…
Gold nanoparticles were generated by ultraviolet irradiation of Langmuir−Blodgett (LB) films of octadecylamine (ODA), 4-hexadecylaniline (HDA), and benzyldimethylstearylammonium chloride monohydrate (BDSAC) deposited from aqueous HAuCl 4 subphases. In contrast, no gold crystals were observed in irradiated LB films pre…
In a combined modeling and experimental study the twin interface in saccharin crystals has been used as the basis for energetic calculations and visualization of the solid−solid interface. A methodology has been developed that has wide applicability to a range of interfaces between crystalline materials.
Reported here are both STM images and spatially resolved tunneling spectra of four different polyoxometalate (POM) structural class members: Keggin structure, H(3)[PW(12)O(40)] (spherical); Finke-Droege (FD) structure, Na(16)[Cu(4)(H(2)O)(2)(P(2)W(15)O(56))(2)] (prolate spheroidal); Wells-Dawson (WD) structure, H(7)[P…
The segmental ligands bis{1-alkyl-2-[6'-(N,N-diethylcarbamoyl)pyridin-2'-yl]benzimidazol-5-yl}methane (alkyl = methyl (L(5)), ethyl (L(6))) react with lanthanide perchlorates (Ln = La, Eu, Gd, Tb) in acetonitrile to yield the f-f dinuclear homotopic triple-stranded helicates [Ln(2)(L(i)())(3)](6+) (i = 5, 6) under the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHalf-Integer-Spin Small Molecule Magnet Exhibiting Resonant Magnetization TunnelingSheila M. J. Aubin, Neil R. Dilley, Michael W. Wemple, M. Brian Maple, George Christou, and David N. HendricksonView Author Information Department of Chemistry-0358 University of Califor…
Sehr stabile Dimere einer Klasse leicht zugänglicher selbstkomplementärer Bausteine für supramolekulare Aggregate bilden sich in Lösung und im Festkörper durch Assoziation über eine Donor-Acceptor-Donor-Acceptor-Anordnung von vier H-Brückenköpfen. Eine weitere, intramolekulare H-Brücke in dem rechts gezeigten Molekül…
The high-resolution crystal structure for [Co(OEP)(NO)] shows that the axial Co−N(NO) vector is tilted from the normal to the porphyrin plane. The off-axis tilt is correlated with an asymmetry in the equatorial Co−Np bond distances.
Ultrathin films of two perylene dyes, 3,4,9,10-perylenetetracarboxylicdianhydride (PTCDA) and N, N ‘-di- n -butylperylene-3,4,9,10-bis(dicarboximide) (C4−PTCDI), have been grown on the (001) faces of freshly cleaved single crystal, NaCl, KCl, and KBr. Tapping mode AFM studies of these materials show that their crystal…
The twelve phosphide oxides RZnPO (R = Y, La-Nd, Sm, Gd-Tm) and the nine arsenide oxides (R = Y, La-Nd, Sm, Gd-Dy) have been prepared by reaction of the rare earth elements, ZnO, and phosphorus or arsenic, respectively, in a NaCl/KCl flux. The compounds RZnPO (R = Y, Pr, Nd, Sm, Gd-Tm) crystallize with a new trigonal…
Catalytic activities and deactivation characteristics of oxides-supported nickel catalysts for the reaction of methane reforming with carbon dioxide were investigated. The dynamic carbon deposition on various nickel catalysts was also studied by a thermogravimetric method. Among the catalysts prepared, Ni/La 2 O 3, Ni…
Clavaminate synthase (CS) is one member of a large class of non-heme iron enzymes that require α-ketoglutarate (α-KG) as a cosubstrate. While the majority of this class catalyzes the hydroxylation of unactivated C−H bonds, CS is unusual in that in addition to performing hydroxylation chemistry, it also catalyzes the k…
The distance dependent interaction between polyelectrolyte-covered mica surfaces in aqueous solution was investigated with the surface forces apparatus. We find the following: (i) The surface charge changes sign, when an oppositely charged polyelectrolyte from a concentrated polyelectrolyte solution is adsorbed. (ii)…
Chemical vapor deposition of germanium onto the silicon (001) surface at atmospheric pressure and 600 degrees Celsius has previously been shown to produce distinct families of smaller (up to 6 nanometers high) and larger (all approximately 15 nanometers high) nanocrystals. Under ultrahigh-vacuum conditions, physical v…
Void shape changes induced by electromigration pose reliability problems in Al-based interconnects. Recent observations have shown that a rounded void sometimes collapses to a transverse slit in an interconnect with bamboo-like grain structure. This article provides a linear stability analysis for a circular void that…
Tetrasodium heptacobalt hexaphosphate, a new monophosphate prepared by hydrothermal methods, comprises CoO6 and CoO4 coordination polyhedra connected to each other by corner and edge sharing to form zigzag layers parallel to the ab plane. These layers are interconnected by Co – O polyhedra and P – O tetrahedra via cor…
A phenomenological model for quantum phase slips of charge-density waves that takes into account the system-size effect is presented. The process of quantum nucleation leading to the phase slip changes from vortex-pair to vortex-ring creations as the external electric field increases, which is analogous to the evoluti…