Search results for "DEP"

Protection of iron-based alloys likely to be exposed to corrosive atmospheres

1998

Summary This study examines the influence of temperature on oxidation kinetics of the alloys Z2CT 17 and Z4CN 18-09. A thin layer of aluminium oxide was laid down on these, using chemical, vapor deposition, in order to give improved protection.

Size-Dependent Spin Switching in Robust Fe-triazole@SiO2 Spin-Crossover Nanoparticles with Ultrathin Shell

2019

<p>A familly of chemically robust hybrid [Fe(Htrz)2(trz)](BF4)@SiO2nanoparticles (NPs) presenting different sizes (from ca. 90 to 28 nm) and an ultrathin silica shell (< 3 nm) have been prepared. All NPs present a characteristic abrupt spin transition with a subsequent decrease in the width of the thermal hysteresis upon reducing the NP size.<br></p>

Equilibrium and spectroscopic studies of diethyltin(iv) complexes formed with hydroxymono- and di-carboxylic acids and their thioanalogues

2002

The complex formation of diethyltin(IV) cation with glycolic (GA), lactic (LA), succinic (SA), malic (MA), tartaric (TA), mercaptoacetic (MAA), 2-mercaptopropionic (MPA), mercaptosuccinic (MSA) and dimercaptosuccinic acid (DMSA) has been investigated by potentiometric, spectrophotometric, 1H NMR and Mossbauer spectroscopic methods. The mercaptocarboxylic acids yielded much more stable complexes than the corresponding hydroxy acids. Below pH 3, the carboxylate and the still protonated hydroxyl group of hydroxy acids are co-ordinated to the metal ion, while in the case of their thio analogues, {COO−, S−} co-ordinated species are dominant. With increasing pH, the metal promoted deprotonation o…

Anomalien bei der kationischen copolymerisation von trioxan. 32. Mitt. über polyoxymethylene

1967

Die kationische Copolymerisation von Trioxan mit Styrol, 1,3-Dioxolan und anderen Comonomeren last sich wegen folgender Nebenreaktionen nicht durch die ubliche MAYO-sche Copolymerisationskinetik erfassen: 1. Depolymerisation der Trioxymethylenbausteine zu Formaldehyd wahrend der Induktionszeit und daher Bildung sehr styrolreicher bzw. dioxolanreicher Prapolymerer. 2. Bildung und Polymerisation von Formaldehyd, welcher wahrend der gesamten Polymerisation in seiner ceiling-Gleichgewichtskonzentration zugegen ist. 3. Abspaltung oxacyclischer Verbindungen von den aktiven Kettenenden; Bildung von Tetroxan und 4-Phenyl-1,3-dioxan bei der Copolymerisation von Trioxan mit Styrol. 4. Ubertragung am …

Pyridine-Incorporated Dihexylquaterthiophene: A Novel Blue Emitter for Organic Light Emitting Diodes (OLEDs)

2012

The synthesis and characterisation of 2,5-bis(5′-hexyl-[2,2′-bithiophen]-5-yl)pyridine (Th4PY) and its use as a blue emitter in organic light emitting diodes (OLEDs) is reported. Th4PY was synthesised in high yield using a straightforward Suzuki coupling route with commercially available starting materials. As Th4PY is both soluble and has low molecular weight, blue OLEDs were fabricated using both spin-coating and vacuum deposition thin film processing techniques to study the effect of processing on device performance. OLED devices using a spin-coated layer consisting of 4′,4′′-tris(N-carbazolyl)triphenylamine (TCTA) and 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as a …

RNA In Vitro Synthesis by Phage T7 DNA-Dependent RNA Polymerase

1998

The purpose of this chapter is to introduce beginners in molecular biology to RNA transcription by phage T7 DNA-dependent RNA polymerase. The work outlined here includes the transcription procedure of plasmid vectors or PCR-amplified DNA templates, the purification and identification of RNA products by sequencing with reverse transcriptase.

Synthesis and spectroscopic characterizations of both 1-ethyl-4,8-dihydro-10-methoxy-3-methyl-8-r1-6-r2-dipyrazolo[3,4-b:4′,3′-f]-[1,5]diazocin-5(1H)…

1995

The non-selective methylation of compounds 3a-d using ethereal diazomethane, allowed the synthesis of isomers 4 and 5 which were useful intermediates for the preparation, by a simple approach, of the title compounds 7 and 9. A complete assignment of the chemical shifts to the carbon atoms of the compounds 7 and 9 was performed by different nmr experiments, such as DEPT and XHDEPT for onebond CH correlations and COLOC experiments for long-range C-H correlations.

Conductive Directly Fused Poly(Porphyrin) Coatings by Oxidative Chemical Vapour Deposition - From Single- to Triple-Fused

2019

Zentral dämpfende Wirkstoffe, 7. Mitt. Kernsubstituierte (Diallylamino)-1,3,5-triazine

1988

Aus der Umsetzung von 2,4-Dichlor-6-(diallylamino)-1,3,5-triazin (1) mit langkettigen primaren (2a-b) und cyclischen sekundaren (2c-f) Aminen gehen die kernsubstituierten Chlor-diallylamino-1,3,5-triazine (3a-f) hervor. Ein fur Strukturtyp 3 charakteristischer ms Fragmentierungsweg beinhaltet die Umbildung der Diallylaminogruppe zum Aziridinring. Unter den neu entwickelten Verbindungen findet sich zentral dampfende Wirksamkeit besonders in 3a ausgepragt. Daruber hinaus weist Strukturtyp 3 Antiprotozoen-, anthelminthische und insektenwachstumsregulatorische Wirkung auf. CNS Depressants, VII: (Diallylamino)-1,3,5-triazines Substituted at the Triazine Nucleus The reaction of 2,4-dichloro-6-(di…

Uranium( iv ) cyclobutadienyl sandwich compounds: synthesis, structure and chemical bonding

2019

The 1 : 1 reactions of uranium(IV) tetrakis(borohydride) with the sodium and potassium salts of the cyclobutadienyl anion [C4(SiMe3)4]2− (Cb′′′′) produce the half-sandwich complexes [Na(12-crown-4)2][U(η4-Cb′′′′)(BH4)3] and [U(η4-Cb′′′′)(μ-BH4)3{K(THF)2}]2. In the 1 : 2 reaction of U(BH4)4 with Na2Cb′′′′, formation of [U(η4-Cb′′′′)(η3-C4H(SiMe3)3-κ-(CH2SiMe2)(BH4))]− reveals that a Cb′′′′ ligand undergoes an intramolecular deprotonation, resulting in an allyl/tuck-in bonding mode. A computational study reveals that the uranium–Cb′′′′ bonding has an appreciable covalent component with contributions from the uranium 5f and 6d orbitals. peerReviewed