Category: 14220-64-5

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Crystal structure and spin crossover studies on bis(2,6-bis(benzimidazol-2-yl)pyridine) iron(II) perchlorate

The structure of the [Fe(bzimpy)2] (ClO4)2 ¡¤ xH2O system (x=0.25) was determined by single crystal X-ray structure analysis. The Fe(II) ion is hexacoordinated by six donor nitrogen atoms. The magnetic properties of the complex were investigated by powder magnetic susceptibility measurements and ESR. The freshly prepared sample does not show any traces of iron(III) impurities but these are formed as a function of time. After 1 year the sample contains 8.2% iron(III) as shown by UV spectroscopy and indicated by geff=4.3 and 2.0 in its ESR spectrum. This explains the recorded x versus T behaviour at low temperature: with increasing temperature the x value decreases according to the Curie-Weiss law for a S=5/2 system having an effective g=4.3. Above 220 K a continuous increase in the x value is observed and a spin crossover applies. The spin transition is not complete at room temperature. A pronounced hysteresis is observed upon heating/cooling the sample between 220 and 414 K on the basis of magnetic data and infrared spectra.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

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Solution and solid-state photoluminescence of bis{succinatobis[2,6-bis(2-benzimidazolyl)] lead(II)}: A comment on the lone-pair stereochemistry and its effect on supramolecular interaction

A new Pb(II) coordination compound, namely [Pb(suc)(H2bbp)]2 (1) has been synthesized by treating succinic acid (H2suc), and 2,6-bis(2-benzimidazolyl) pyridine (H2bbp) with Pb(II) nitrate under hydrothermal conditions. Dicarboxylate as a bridging ligand is used to link adjacent metal centers forming dinuclear metal complex. The arrangement of the H2bbp ligand and carboxyl groups suggest a gap in the coordination around the Pb(II) ion, occupied possibly by a stereoactive lone-pair of electrons on Pb(II) where the coordination around the lead atoms is hemidirected. At room temperature, in the solid-state, the compound displays blue luminescence at 438 nm, which is about 50 nm red-shifted compared to the emission in DMF solution, resulting from long Pb¡¤¡¤¡¤O interactions, a closer inspection of the pack reveals pi-pi stacking interactions that are crucial to lowering the HOMO-LUMO energy gaps.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Recommanded Product: 14220-64-5, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 14220-64-5, Name is Bis(benzonitrile)palladium chloride, molecular formula is C14H10Cl2N2Pd

Polymerization of ethylene catalyzed by vanadium(III) complexes

Thirty five complexes of 1,2- bis(benzimidazole, benzothiazole and benzoxazole)benzene, 1,2-bis(benzimidazole, benzothiazole and benzoxazole)-4-methyl-benzene, 1,2-bis (benzimidazole, benzothiazole and benzoxazole)4-bromobenzene, 1, 2-bis(benzimidazole, benzothiazole and benzoxazole) 4- chlorobenzene, and 2, 6-bis(benzimidazole, benzothiazole and benzoxazole) pyridine compounds with V (III) metal centers were synthesized, characterized, activated with methylalumoxane (MAO) and then tested for catalytic ethylene polymerization. The catalysts generally show moderate to good activities compared to the benchmark catalyst Cp2ZrCl2. The activities of the various catalysts were found to be function of the hetero atoms in the ligand frameworks and also strongly influenced by the bridging unit of the ligand. The highest activity was obtained with 36/MAO (442 kg PE/mol cat. h). The produced polyethylenes showed high molecular weights (up to 2.7 ¡Á 106 g/mol) and broad molecular weight distributions (PD = 1.4 – 16.6). Thermal analysis of polyethylenes produced with vanadium complexes revealed that the catalyst systems were capable to produce high density polyethylenes with melting temperatures > 135 C and crystallization temperatures range from 117-120 C with high degree of crystallinity.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Recommanded Product: 14220-64-5, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 14220-64-5, in my other articles.

Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Product Details of 14220-64-5, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 14220-64-5, Name is Bis(benzonitrile)palladium chloride, molecular formula is C14H10Cl2N2Pd

Structures and fluorescent properties of picolinato zinc(II) and cadmium(II) complexes based on tridentate and tetradentate benzimidazole ligands

Five picolinato zinc(II) and cadmium(II) complexes, [Zn(ntb)(pic)]ClO4¡¤CH3OH¡¤2H2O (1), [Zn(bbma)(pic)]NO3¡¤2CH3OH (2), [Cd(ntb)(pic)]ClO4¡¤0.75CH3OH¡¤H2O (3), [Cd2(bbma)2(pic)2](ClO4)2 (4), and [Cd2(bbp)(bbp-H)(pic)2(C2H5OH)]ClO4 (5), have been synthesized, where pic is the anion of picolinic acid, ntb is tris(2-benzimidazolylmethyl)amine, bbma is bis(benzimidazol-2-yl-methyl)amine, and bbp is 2,6-bis(benzimidazol-2-yl)pyridine. All the complexes were characterized by X-ray single-crystal diffraction, elemental analysis, IR, fluorescence spectroscopy, and thermal gravimetric analysis. 1?3 are mononuclear complexes in which picolinate adopts a N,O-chelating mode. 4 is a symmetrical dinuclear complex bridged by two anti-parallel picolinates in a N,O,O-coordination mode. 5 is also a dinuclear complex in which only one picolinate is a bridge. A 1-D double chain is formed by extensive H-bonds and pi?pi stacking in 1, while single zigzag chains are formed in 5. Complexes 2?4 all exhibit 63-hcb 2-D frameworks. They extend to form four-connected 66-dia 3-D topological nets for 2 and 4 and five-connected 46¡¤64-bnn 3-D topological nets for 3. The five complexes show emission maxima in the blue region in the solid state.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Safety of Bis(benzonitrile)palladium chloride, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 14220-64-5, name is Bis(benzonitrile)palladium chloride. In an article£¬Which mentioned a new discovery about 14220-64-5

Mitochondria-targeting anticancer metal complexes

Background: Since the serendipitous discovery of the antitumor activity of cisplatin there has been a continuous surge in studies aimed at the development of new cytotoxic metal complexes. While the majority of these complexes have been designed to interact with nuclear DNA, other targets for anticancer metallodrugs attract increasing interest. In cancer cells the mitochondrial metabolism is deregulated. Impaired apoptosis, insensitivity to antigrowth signals and unlimited proliferation have been linked to mitochondrial dysfunction. It is therefore not surprising that mitochondria have emerged as a major target for cancer therapy. Mitochondria-targeting agents are able to bypass resistance mechanisms and to (re-) activate cell-death programs. Methods: Web-based literature searching tools such as SciFinder were used to search for reports on cytotoxic metal complexes that are taken up by the mitochondria and interact with mitochondrial DNA or mitochondrial proteins, disrupt the mitochondrial membrane potential, facilitate mitochondrial membrane permeabilization or activate mitochondria-dependent celldeath signaling by unbalancing the cellular redox state. Included in the search were publications investigating strategies to selectively accumulate metallodrugs in the mitochondria. Results: This review includes 241 references on antimitochondrial metal complexes, the use of mitochondria-targeting carrier ligands and the formation of lipophilic cationic complexes. Conclusion: Recent developments in the design, cytotoxic potency, and mechanistic understanding of antimitochondrial metal complexes, in particular of cyclometalated Au, Ru, Ir and Pt complexes, Ru polypyridine complexes and Au-N-heterocyclic carbene and phosphine complexes are summarized and discussed.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

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A V-shaped ligand 2,6-bis(2-benzimidazolyl)pyridine and its picrate Mn(II) complex: Synthesis, crystal structure and DNA-binding properties

A V-shaped ligand 2,6-bis(2-benzimidazolyl)pyridine (bbp) and its picrate Mn(II) complex have been synthesized and characterized by elemental analysis, molecular conductivities, 1H NMR, IR, UV-vis spectra and X-ray single crystal diffraction. The crystal structure of [Mn(bbp)2](pic) 2¡¤2DMF is six-coordinated forming a distorted octahedron. The DNA-binding properties of the two compounds were investigated by electronic absorption spectra, fluorescence spectra and viscosity measurements. The experimental results suggest that the two compounds bind to DNA in an intercalation mode. The main reason of the DNA-binding behaviors may be the large coplanar aromatic rings in the V-shaped ligand. As compared to the DNA-binding affinities of the two compounds, the Mn(II) complex is stronger than bbp. This may be due to the V-shaped angle changed.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Computed Properties of C14H10Cl2N2Pd, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 14220-64-5, name is Bis(benzonitrile)palladium chloride. In an article£¬Which mentioned a new discovery about 14220-64-5

Spin Crossover in New Iron(II) Complexes with 2,6-Bis(benzimidazole-2-yl)pyridine

Abstract: New coordination compounds of iron(II) sulfate, hexafluorosilicate, and perrhenate with 2,6-bis(benzimidazole-2-yl)pyridine (L), namely, [FeL2]SO4 ? H2O (I), [FeL2]SiF6 ? H2O (II), and [FeL2](ReO4)2 ? 1.5H2O (III) have been synthesized. The complexes have been studied by static magnetic susceptibility, electronic (diffuse reflectance), IR, and Moessbauer spectroscopy, and X-ray diffraction. The mueff(T) study of dehydrated complexes I?III (1?3) within the range 80?520 K has shown the spin transition 1?1 ? 5?2. A two-stage transition is observed in complex 1, whereas one-stage transitions occur in complexes 2 and 3. The forward spin transition temperatures (???) of complexes 1?3 are 423 and 503, 476, 362 K, respectively. Complex 3 sustains an abrupt spin transition with a hysteresis in the mueff(T) curve (DeltaT = 21 K).

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

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Convenient iron-catalyzed reductive aminations without hydrogen for selective synthesis of N-methylamines

N-Methylated amines play an important role in regulating the biological and pharmaceutical properties of all kinds of life science molecules. In general, this class of compounds is synthesized via reductive amination reactions using high pressure of molecular hydrogen. Thus, on laboratory scale especially in drug discovery, activated (toxic) methyl compounds such as methyl iodide and dimethyl sulfate are still employed, which also generate significant amounts of waste. Therefore, the development of more convenient and operationally simple processes for the synthesis of advanced N-methylamines is highly desired. Herein, we report the synthesis of functionalized and structurally diverse N-methylamines directly from nitroarenes and paraformaldehyde, in which the latter acts as both methylation and reducing agent in the presence of reusable iron oxide catalyst. The general applicability of this protocol is demonstrated by the synthesis of >50 important N-methylamines including highly selective reductive N-methylations of life science molecules and actual drugs, namely hordenine, venlafaxine, imipramine and amitriptyline.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

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Synthesis and characterization of some mixed-ligand picrate complexes of nickel(II) involving heterocyclic nitrogen donors

The present communication describes the synthesis of some mixed-ligand hexacoordinated picrato complexes of nickel(II) of the composition [Ni(PA)2(L-L)2], where PAH = picric acid and L-L = 2-aminoben-zothiazole (ABZT), 2-(2?-aminophenyl)benzothiazole (2?-AMPHBZT), 2-(3?-aminophenyl)benzothiazole (3?-AMPHBZT), bipyridine (bpy), o-phenanthroline (phen) or 2,6-bis(benzimidazyl)pyridine (BBZLPY). These complexes were obtained by the interaction of nickel(II) picrate with the corresponding ligands L-L in methanol. The resulting compounds have been characterized by elemental analyses, magnetic, molar conductance and decomposition temperature measurements, electron spin resonance, infrared and electronic spectral studies. All the complexes are thermally stable and behave as non-electrolytes. An octahedral structure has been tentatively proposed for these complexes.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

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Synthesis, characterization, and ethylene oligomerization and polymerization of [2,6-bis(2-benzimidazolyl)pyridyl]chromium chlorides

A series of [2,6-bis(2-benzimidazolyl)pyridyl]chromium chlorides have been synthesized and characterized by elemental analysis and IR spectroscopy, along with X-ray diffraction analysis for the structures of Cl and C7. When methylaluminoxane (MAO) was employed as the cocatalyst, the chromium complexes showed high activity for ethylene oligomerization and polymerization. Oligomers were produced with high selectivity for alpha-olefins, and polyethylenes were generated with extremely broad molecular weight distributions. In the presence of diethylaluminum chloride (Et2AlCl), these chromium complexes showed moderate activity for ethylene polymerization and produced high-molecular-weight linear polyethylene.

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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method