Tag: M.W=400-500

SDS of cas: 14481-08-4. 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 Standard enthalpies of formation of tris[bis(pentane-2,4-dionato)nickel(II)] and bis(2,2,6,6-tetramethylheptane-3,5-dionato)nickel(II) and an estimation of nickel-oxygen bond energies. Author is Irving, Roger J.; Ribeiro da Silva, Manuel A. V..

Standard enthalpies of formation of the title complexes were determined by solution calorimetry from the heats of solution of the Ni salts and ligands at 298.15 K. The heats of formation of (NiL2)3 [HL = (MeCO)2C2] [29090-30-0] and Ni(L1)2 [HL1 = (Me3CCO)2CH2] [14481-08-4] were -624.0 and -299.2 kcal/mol, resp. Estimates of gas-phase enthalpies of the monomeric forms of both complexes gave an average homolytic Ni-O bond energy of 50 kcal/mol, but in the pentanedionate trimer the bridging O atoms have Ni-O bond energies of approx. half those of the terminal Ni-O bonds.

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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 (1,10-Phenanthroline-κ2N,N’)bis(2,2,6,6-tetramethylheptane-3,5-dionato-κ2O,O’)nickel(II), the main research direction is crystal structure nickel phenanthroline tetramethylheptanedionato complex; mol structure nickel phenanthroline methylheptanedionato complex.Formula: C22H38NiO4.

Bis(2,2,6,6-tetramethylheptane-3,5-dionato-κ2O,O’)(1,10-phenanthroline-κ2N,N’)nickel, [Ni(C11H19O2)2(C12H8N2)], was obtained from the reaction of bis(2,2,6,6-tetramethylheptane-3,5-dionato)nickel(II), [Ni(dpm)], and 1,10-phenanthroline (phen). The NiII ion is coordinated by 4 O atoms from 2 dpm ligands and 2 N atoms from a phen ligand in a slightly distorted octahedral environment. The Me C atoms of 2 of the CMe3 groups are disordered over 2 sites, having approx. occupancies of 0.85 and 0.15 for the 2 components. In the crystal structure, there are no direction-specific interactions. Thermal studies showed that the title complex is stable to 623 K. Crystallog. data are given.

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Collins, Michael J.; Henneike, H. Fred published the article 《Lewis acid studies of bis(2,2,6,6-tetramethyl-3,5-heptanediono)nickel(II)》. Keywords: tetramethylheptanediononickel Lewis acid adduct; dimethylsulfoxide tetramethylheptanediononickel adduct; diethylamine tetramethylheptanediononickel adduct; triethylamine tetramethylheptanediononickel adduct; pyridineoxide tetramethylheptanediononickel adduct.They researched the compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4 ).Application of 14481-08-4. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:14481-08-4) here.

Equilibrium constants and enthalpies for the adduct formation reaction between the square-planar diamagnetic Lewis acid bis(2,2,6,6-tetramethyl-3,5-heptanedionato) nickel(II) and the Lewis bases Me2SO, pyridine-N-oxide, diethylamine, and Et3N were determined under solvent conditions in which the reported enthalpies of the mono adduct formation reactions are found to correlate well with the Drago-Wayland (1970) equation. The magnetic moment of the diethylamino mono adduct is 3.25 μB. This represents the 1st time the parameters of the equation have been determined for a Lewis acid which undergoes a change in spin state upon coordination.

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Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 14481-08-4, is researched, SMILESS is CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C, Molecular C22H38NiO4Preprint, ChemRxiv called Nickel supported on mesoporous zirconium oxide by atomic layer deposition: initial fixed-bed reactor study, Author is Voigt, Pauline; Haimi, Eero; Lahtinen, Jouko; Cheah, You Wayne; Makela, Eveliina; Viinikainen, Tiia; Puurunen, Riikka L., the main research direction is nickel supported mesoporous zirconium oxide atomic layer deposition catalyst.COA of Formula: C22H38NiO4.

Atomic layer deposition (ALD) is gaining attention as a catalyst preparation method able to produce metal (oxide, sulfide, etc.) nanoparticles of uniform size down to single atoms. This work reports our initial experiments to support nickel on mesoporous zirconia. Nickel (2,2,6,6-tetramethyl-3,5-heptanedionato)2 [Ni(thd)2] was reacted in a fixed-bed ALD reactor with zirconia, characterized with BET surface area of 72 m2/g and mean pore size of 14 nm. According to X-ray fluorescence measurements, the average nickel loading on the top part of the support bed was on the order of 1 wt-%, corresponding to circa one nickel atom per square nanometer. Cross-sectional SEM combined with energy-dispersive spectroscopy confirmed that in the top part of the fixed support bed, nickel was distributed throughout the zirconia particles. XPS indicated the nickel oxidation state to be two. Organic thd ligands remained complete on the surface after the Ni(thd)2 reaction with zirconia, as followed with diffuse reflectance IR Fourier transform spectroscopy. The ligands could be fully removed by oxidation at 400 °C. These initial results indicate that nickel catalysts on zirconia can likely be made by ALD. Before catalytic testing, in addition to increasing the nickel loading by repeated ALD cycles, optimization of the process parameters is required to ensure uniform distribution of nickel throughout the support bed and within the zirconia particles.

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Application of 14481-08-4. 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 Application of the angular overlap model to the interpretation of the electronic spectra of copper(II) and nickel(II) acetylacetonate complexes. Author is Hitchman, M. A..

σ- And π-bonding parameters were calculated by the angular overlap model for CuL2 nLH = MeCOCH2COMe, MeCOCH2COPh, MeCOCHPnCOMe) and Ni(Me3CCOCHCOCMe3) (I). The results suggested the orbital sequence dxy ≫ dz2 > dx2-y2 > dxz ∼ dyz for the Cu complexes but dxy ≫ dx2-y2 > dz2 > dxz ∼ dyzfor I due to stronger metal-ligand interaction. The parameters estimated for I were used to predict d-orbital splittings for [NiL2]3, NiL2.2H2O, and NiL2.py2 (LH = MeCOCH2COMe).

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Recommanded Product: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Gas-phase electron attachment to metal complexes. The influence of oxygen and sulfur donor atoms on the electron attachment reactions of bis-chelates of nickel(II). Author is Garnett, J. L.; Gregor, I. K.; Guilhaus, M.; Dakternieks, D. R..

Study on the effects of O and S donor atoms on the electron-attachment reactions of a number of bis-chelates of Ni (II) with β-diketones and their mono- and dithio analogs by neg.-ion mass spectrometry indicated that high yields of mol. neg. ions can be obtained by low-energy electron attachment, and a greater ease of reduction occurs as the number of S atoms bonded to Ni increases. Neg. ions from ion-mol. reactions are also presented.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Electronic structure and molecular association of some bis-(β-diketone)-nickel(II) complexes》. Authors are Fackler, J. P. Jr.; Cotton, F. A..The article about the compound:Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C).Computed Properties of C22H38NiO4. Through the article, more information about this compound (cas:14481-08-4) is conveyed.

Bis-(2,2,6,6-tetramethyl-3,5-heptanedione)-Ni(II) (I) is diamagnetic. Hydrocarbon solutions of I are red and have an absorption maximum at 535 mμ with a mol. extinction coefficient of 60. I forms a blue-green paramagnetic dihydrate. Bis(2,2-dimethyl-3,5-heptanedione)-Ni(II) (II) is paramagnetic, μeff. (297.4°K.) = 3.41 Bohr magnetons in the solid phase. Solutions of II in toluene have magnetic moments that are concentration and temperature dependent. The color of solutions of II changes from green near 0° to red at 50°, corresponding to an increase in absorption at 535 mμ. The paramagnetism in anhydrous β-diketone complexes of Ni(II) may be attributed to intermol. interactions, the monomers being diamagnetic. Thus the bulky tert-Bu groups in I prevent intermol. reactions and so anhydrous I is diamagnetic. In II interactions can take place and II is paramagnetic. Anhydrous bis-(3-phenyl-2,4-pentanedione)-Ni(II) (III) also is diamagnetic. Here the Ph group hinders interaction. III behaves similarly to II in toluene solution

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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, Article, Chemical Communications (Cambridge, United Kingdom) called Supertetrahedral decametallic Ni(II) clusters directed by μ6-tris-alkoxides, Author is Shaw, Rachel; Tidmarsh, Ian S.; Laye, Rebecca H.; Breeze, Barbara; Helliwell, Madeleine; Brechin, Euan K.; Heath, Sarah L.; Murrie, Mark; Ochsenbein, Stefan; Guedel, Hans-Ulrich; McInnes, Eric J. L., which mentions a compound: 14481-08-4, SMILESS is CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C, Molecular C22H38NiO4, Application of 14481-08-4.

The authors report the syntheses, structures and magnetic properties of two decametallic Ni(II) clusters with unprecedented supertetrahedral cores, stabilized by the (hitherto unobserved) μ6-coordination modes of the tris-alkoxides {MeC(CH2O)3}3- and {C6H9O3}3-, namely [Ni10O(thme)4(dbm)4(O2CPh)2(EtOH)6] (I) and [Ni10O(cht)4(dpm)4(OAc)2(H2O)2] (II) (H3thme = 1,1,1-tris(hydroxymethyl)ethane; H3cht = cis,cis-1,3,5-cyclohexanetriol; Hdbm = dibenzoylmethane; Hdpm = dipivaloylmethane). The crystal structures of I and II were determined I exhibits antiferromagnetic exchange.

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Zharkova, G. I.; Baidina, I. A.; Stabnikov, P. A. published an article about the compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C ).Reference of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:14481-08-4) through the article.

New volatile β-iminoketonate complexes of Ni(L)2 and Pd(L)2 were obtained, where HL is β-Aminovinylketone, CMe3C(NH2):CHC(O)CMe3, 2,2,6,6-tetramethyl-3-amino-4-hepten-5-one. Synthesis of the compound is described, and element anal., DTA, and IR spectral data are given. The complexes were studied by XRPA and XRD. The structures are mol., consist of the trans complexes, and are isostructural. The central atoms have a square plane environment with a (MO2N2) coordination unit. The M-O and M-N distances and the N-M-O valence chelate angles are equal, 1.834 Å, 1.848 Å, and 94.2° for Ni(L)2 and 1.972 Å, 1.975 Å, and 92.4° for Pd(L)2.

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Benetis, N.; Kowalewski, J.; Nordenskioeld, L.; Edlund, U. published the article 《Nuclear spin relaxation in a paramagnetic nickel(II) complex. An experimental test of new theoretical models》. Keywords: nuclear spin relaxation methylheptanedionato nickel.They researched the compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4 ).Related Products of 14481-08-4. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:14481-08-4) here.

Paramagnetic relaxation enhancement data are reported for 15N and 1H in aniline in the presence of bis(2,2,6,6-tetramethylheptanedionato)nickel(II). For 15N, the spin-lattice T1 as well as spin-spin relaxation rates are reported at 2.35 and 5.875 T and of 244-356 K. For 1H T1 data at 2 fields (5.875 and 9.4 T) 263-333 K. The exptl. data are fitted to a new theor. model, not invoking the concept of electron spin relaxation times, which is valid in the slow motion regime for the electron spin. The parameters obtained form a consistent set and have reasonable values, but the 15N results could not be fitted by using the conventional model based on the modified Solomon-Bloembergen equations.

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