Tag: M.W=400-500

Computed Properties of C31H32O2P2. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: (((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine), is researched, Molecular C31H32O2P2, CAS is 32305-98-9, about Palladium-Catalysed Carboborylation for the Synthesis of Borylated Indanes. Author is Zieba, Andrzej; Hooper, Joel F..

A palladium-catalyzed carboborylation reaction for the synthesis of borylated indanes has been investigated. This reaction proceeds in good yields with an achiral catalyst, and is tolerant of substitution on the aryl ring, although sensitivity to the substitution of the alkene was observed Initial studies towards an enantioselective version of this reaction were undertaken, identifying phosphoramidites as a promising ligand class. This allowed for the synthesis of chiral indane and indolone products with moderate levels of enantioselectivity.

This compound((((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine))Computed Properties of C31H32O2P2 was discussed at the molecular level, the effects of temperature and reaction time on the properties of the compound were discussed, and the optimum reaction conditions were selected.

Reference:
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Ester – an overview | ScienceDirect Topics

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4 ) is researched.Safety of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II).Lochmuller, C. H.; Hangac, Helen H. published the article 《Mobile phase additives vs. bonded phases for HPLC》 about this compound( cas:14481-08-4 ) in Critical Reviews in Analytical Chemistry. Keywords: mobile phase additive bonded phase HPLC; diketonate mobile phase additive HPLC. Let’s learn more about this compound (cas:14481-08-4).

Probably 90% of all small-mol. HPLC separations can be done with a hydrocarbon-bonded phase of C4, C8, or C18 length using various mobile phases. The remaining 10% of the cases are more challenging. One solution is to follow the historical path of gas-liquid chromatog. and create more bonded phases. The 2nd and more easily done is to add components to the mobile phase that interact selectively with the mols. of interest and change RPLC selectivity and retention. This paper begins with a generalized discussion of additive strategy and mechanism and then leads to a study of nonionic but coordinatively unsaturated β-diketonates as additives which serves as an example of the connection between mol. chem. and chromatog. selectivity and a review of other work done. A system of coordinatively unsaturated metal β-diketonates was studied as mobile phase additives for HPLC. Unlike previous ionic, metal dopants, these neutral complexes combine reasonable elution times, high chromatog. efficiency, and enhanced chromatog. selectivity for polar compounds in normal and reversed-phase modes. The influences of mobile-phase composition, stationary-phase substrate, and metal on solute retention behavior were examined for the metal-dipivaloylmethane additive systems.

This compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))Safety of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II) was discussed at the molecular level, the effects of temperature and reaction time on the properties of the compound were discussed, and the optimum reaction conditions were selected.

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 14481-08-4, is researched, Molecular C22H38NiO4, about Atomic Layer Deposition of NiO by the Ni(thd)2/H2O Precursor Combination, the main research direction is bistetramethylheptane dionatonickel water nickel oxide atomic layer deposition.Recommanded Product: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II).

Polycrystalline nickel oxide is deposited on SiO2 substrates by alternating pulses of bis(2,2,6,6-tetramethylheptane-3,5-dionato)nickel(II) (Ni(thd)2) and H2O. The deposition process shows at. layer deposition (ALD) characteristics with respect to the saturation behavior of the two precursors at deposition temperatures up to 275 °C. The growth of nickel oxide is shown to be highly dependent on surface hydroxide groups, and a large excess of H2O is required to achieve saturation Throughout the deposition temperature range the amount of carbon in the film, originating from the metal precursor ligand, is in the range 1-2%. Above 275 °C ALD growth behavior is lost in favor of thermal decomposition of the metal precursor. The initial nucleation process is studied by at. force microscopy (AFM) and reveals nucleation of well-separated grains which coalesce to a continuous film after about 250 ALD cycles.

This compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))Recommanded Product: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II) was discussed at the molecular level, the effects of temperature and reaction time on the properties of the compound were discussed, and the optimum reaction conditions were selected.

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Safety of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Synthesis of undoped and Ni doped InTaO4 photoactive thin films by metal organic chemical vapor deposition. Author is McSporran, N.; Rico, V.; Borras, A.; Gonzalez-Elipe, A. R.; Sauthier, G.; Gyoergy, E.; Santiso, J.; Garcia, G.; Figueras, A.; Parafianovic, L.; Abrutis, A..

Indium tantalate (InTaO4) and nickel doped InTaO4, In1-xNixTaO4 (x = 0.1), thin films were grown by Pulsed Injection Metal Organic Chem. Vapor Deposition (PI-MOCVD). The deposition was carried out using as precursors a solution of Ta(OC2H5)5 and In(THD)3 in toluene for the InTaO4 and Ta(OC2H5)5, In(THD)3 and Ni(THD)2 in toluene for the In1-xNixTaO4 thin films. The compounds formation, films stoichiometry and crystalline structure were studied as a function of substrate temperature and precursors concentration Crystalline and stoichiometric (indium/tantalum at. ratio of 1) films were obtained under optimized deposition conditions. Post-deposition heat treatment in N2 or O2 atmospheres further improved the crystalline quality of the films. Under optimum growth conditions the films showed no phase segregations, a feature that makes them suitable for future photocatalytic applications. The study of hydrophilic activities of In1-xNixTaO4 thin films evidenced a decrease of the water contact angle up to 60° under visible light irradiation and a complete transformation in a superhydrophilic state upon UV irradiation

《Synthesis of undoped and Ni doped InTaO4 photoactive thin films by metal organic chemical vapor deposition》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))Safety of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II).

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Reference of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Surface Modification of CoOx Loaded BiVO4 Photoanodes with Ultrathin p-Type NiO Layers for Improved Solar Water Oxidation. Author is Zhong, Miao; Hisatomi, Takashi; Kuang, Yongbo; Zhao, Jiao; Liu, Min; Iwase, Akihide; Jia, Qingxin; Nishiyama, Hiroshi; Minegishi, Tsutomu; Nakabayashi, Mamiko; Shibata, Naoya; Niishiro, Ryo; Katayama, Chisato; Shibano, Hidetaka; Katayama, Masao; Kudo, Akihiko; Yamada, Taro; Domen, Kazunari.

Photoelectrochem. (PEC) devices that use semiconductors to absorb solar light for water splitting offer a promising way toward the future scalable production of renewable hydrogen fuels. However, the charge recombination in the photoanode/electrolyte (solid/liquid) junction is a major energy loss and hampers the PEC performance from being efficient. Here, we show that this problem is addressed by the conformal deposition of an ultrathin p-type NiO layer on the photoanode to create a buried p/n junction as well as to reduce the charge recombination at the surface trapping states for the enlarged surface band bending. Further, the in situ formed hydroxyl-rich and hydroxyl-ion-permeable NiOOH enables the dual catalysts of CoOx and NiOOH for the improved water oxidation activity. Compared to the CoOx loaded BiVO4 (CoOx/BiVO4) photoanode, the ∼6 nm NiO deposited NiO/CoOx/BiVO4 photoanode triples the photocurrent d. at 0.6 VRHE under AM 1.5G illumination and enables a 1.5% half-cell solar-to-hydrogen efficiency. Stoichiometric oxygen and hydrogen are generated with Faraday efficiency of unity over 12 h. This strategy could be applied to other narrow band gap semiconducting photoanodes toward the low-cost solar fuel generation devices.

《Surface Modification of CoOx Loaded BiVO4 Photoanodes with Ultrathin p-Type NiO Layers for Improved Solar Water Oxidation》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))Reference of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II).

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Chemical vapour deposition of metastable Ni3N, published in 2009, which mentions a compound: 14481-08-4, Name is Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), Molecular C22H38NiO4, SDS of cas: 14481-08-4.

Metastable nickel nitride (Ni3N) was chem. vapor deposited using bis(2,2,6,6-tetramethyl-3,5-heptanedionato)Ni(II) (Ni(thd)2) and ammonia precursors. The growth on both nonetched Si(100) and amorphous SiO2 is polycrystalline at deposition temperatures between 200-290°. However, at the highest temperatures the impurity level of oxygen and carbon originating from the metal precursor ligand, is ∼5%. The growth rate dependence of temperature is divided into three different regions with large differences in activation energies, interpreted as different factors controlling the growth. The deposition rate as a function of precursor supply as well as the incubation time for the growth initiation are different at temperatures which are further indications of differences in reaction mechanism. By substitution of NH3 for H2 to the reactant gas the growth mechanism occurs via surface -NHx groups.

《Chemical vapour deposition of metastable Ni3N》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))SDS of cas: 14481-08-4.

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

HPLC of Formula: 14481-08-4. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Thermochemical properties of nickel(II) β-diketonates. Author is Gerasimov, P. A.; Gerasimova, A. I.; Arkhipov, Yu. A.; Igumenov, I. K..

The heats of combustion and formation as well as sublimation heat at 298.15 K and sublimation pressures determined measured calorimetrically for Ni dipivaloylmethanate (Ni(DPM)2) and Ni diketoiminate (Ni(KI)2). Equations for the sublimation pressures as functions of absolute temperature are given for the intervals 364.7-385.4 and 348.1-358.3 K for Ni(DPM)2 and Ni(KI)2, resp.

《Thermochemical properties of nickel(II) β-diketonates》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))HPLC of Formula: 14481-08-4.

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Molecular Catalysis called Immobilized chiral rhodium nanoparticles stabilized by chiral P-ligands as efficient catalysts for the enantioselective hydrogenation of 1-phenyl-1,2-propanedione, Author is Ruiz, Doris; Maki-Arvela, Paivi; Aho, Atte; Chimentao, Ricardo; Claver, Carmen; Godard, Cyril; Fierro, Jose L. G.; Murzin, Dmitry Yu., which mentions a compound: 32305-98-9, SMILESS is CC1(C)O[C@@H](CP(C2=CC=CC=C2)C3=CC=CC=C3)[C@H](CP(C4=CC=CC=C4)C5=CC=CC=C5)O1, Molecular C31H32O2P2, Computed Properties of C31H32O2P2.

This work reports the efficient synthesis of enantio-enriched alcs. by asym. hydrogenation of 1-phenyl-1,2-propanedione using chiral nanoparticles (NPs) supported on SiO2. The chiral catalysts were synthesized by reducing the [Rh(μ-OCH3)(C8H12)]2 precursor under H2 in the presence of P-chiral ligands as stabilizers and SiO2 as support. Synthesis of catalysts in mild conditions was performed from labile organometallic precursor and chiral ligands provided small and well defined chiral nanoparticles (≤ 3 nm). The catalysts were characterized by XPS, HR-TEM, EDS, XRD and N2 physisorption isotherm. The phys. chem. properties of the materials were correlated with the catalytic results obtained in the asym. hydrogenation of 1-phenyl-1,2-propanedione. In 1-phenyl-1,2-propanedione hydrogenation the best results using chiral catalysts allowed 98% conversion and enantiomeric excess of 67% to (R)-1-hydroxy-1-phenyl-propan-2-one and 59% for (R)-2-hydroxy-1-phenylpropan-1-one. Catalyst recycling studies revealed that chiral nanoparticles immobilized on SiO2 are stable. These catalysts do not need extra amount of chiral modifier or inducer added in situ and could be reused without loss of enantioselectivity.

《Immobilized chiral rhodium nanoparticles stabilized by chiral P-ligands as efficient catalysts for the enantioselective hydrogenation of 1-phenyl-1,2-propanedione》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound((((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine))Computed Properties of C31H32O2P2.

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthetic Route of C22H38NiO4. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Thermodynamics of metal-ligand bond formation. VI. Trimerization and base addition of nickel(II) β-diketonates. Author is Ang, L. T.; Graddon, D. P..

Five Ni(II) complexes of β-diketones(LH) were studied by calorimetric titration with pyridine in C6H6 solution Trimerization of the complexes NiL2 is endothermic and entropy-driven, probably as a result of desolvation of the low-spin monomers. Reaction with pyridine occurs in 2 steps, forming successively Ni2L4(py) and NiL2(py)2. The enthalpy of formation of NiL2(py)2 from the intermediate adduct is about -40 kJ mole-1 and shows no evidence for bulkiness of the ligand leading to steric instability in Ni2L4(py). Variations in the relative stabilities of the monomeric and trimeric forms of NiL2 seem more likely to be due to electronic than steric effects.

《Thermodynamics of metal-ligand bond formation. VI. Trimerization and base addition of nickel(II) β-diketonates》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))Synthetic Route of C22H38NiO4.

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

HPLC of Formula: 14481-08-4. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about On the spectral similarities between 1,2,6,7-tetracyano-3,5-dihydro-3,5-diiminopyrrolizinato complexes and phthalocyanines – X-ray crystal and molecular structure of two mixed monopyrrolizinato nickel(II) complexes with the 2,4-tert-butylacetylacetonide ligand.

Complexes of NiII, CuII, ZnII, and CoIII containing the 1,2,6,7-tetracyano-3,5-dihydro-3,5-diiminopyrrolizinide (L) and the dipivaloylmethanate (DPM) ligands were synthesized and characterized. The absorption optical spectra of these species and of the corresponding ML2 complexes in coordinating solvents are compared with those of metal-phthalocyanines (MPc) and hydrogen-phthalocyanine (H2Pc), resp. The comparison shows a close similarity, especially for the nickel-containing species, in the low-energy spectral region where the 1st π→π* transitions occur (Q band). The Q band position of the pyrrolizinato complexes is much more dependent on the metal than is the case for MPc. For the same metal, the Q band position is also dependent on the M-N bond lengths in the mol. plane. For M = Ni, a reduction of this distance causes a red shift of the Q band and a decrease of its maximum intensity. These conclusions are based on the x-ray mol. structure of the solvent-free NiL(DPM) complex and its pyridine solvate NiL(DPM)(Py)2·2Py and on their solvatochromism. A symmetry-based correlation diagram between the frontier orbitals of the pyrrolizinato-complexes and the phthalocyanines is proposed.

《On the spectral similarities between 1,2,6,7-tetracyano-3,5-dihydro-3,5-diiminopyrrolizinato complexes and phthalocyanines – X-ray crystal and molecular structure of two mixed monopyrrolizinato nickel(II) complexes with the 2,4-tert-butylacetylacetonide ligand》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound(Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II))HPLC of Formula: 14481-08-4.

Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics