202 results about "Chelating ligands" patented technology

Chelating ligand precursors for the preparation of olefin metathesis catalysts are disclosed. The resulting catalysts are air stable monomeric species capable of promoting various metathesis reactions efficiently, which can be recovered from the reaction mixture and reused. Internal olefin compounds, specifically beta-substituted styrenes, are used as ligand precursors. Compared to terminal olefin compounds such as unsubstituted styrenes, the beta-substituted styrenes are easier and less costly to prepare, and more stable since they are less prone to spontaneous polymerization. Methods of preparing chelating-carbene metathesis catalysts without the use of CuCl are disclosed. This eliminates the need for CuCl by replacing it with organic acids, mineral acids, mild oxidants or even water, resulting in high yields of Hoveyda-type metathesis catalysts. The invention provides an efficient method for preparing chelating-carbene metathesis catalysts by reacting a suitable ruthenium complex in high concentrations of the ligand precursors followed by crystallization from an organic solvent.

A process for preparing a naphtha reforming catalyst has been developed. The process involves the use of a chelating ligand such as ethylenediaminetetraacetic acid (EDTA). The aqueous solution of the chelating ligand and a tin compound is used to impregnate a support, e.g., alumina extrudates. A platinum-group metal is also an essential component of the catalyst. Rhenium may also be a component. A reforming process using the catalyst has enhanced yield, activity, and stability for conversion of naphtha into valuable gasoline and aromatic products.

A curable mixture comprising at least one cyanate resin, at least one epoxide compound with more than one epoxy group per molecule, and a metal formula selected from the group consisting of MLxBy, M[SR]xBy, M[SR]x(N)y, M(PHal)m and M(PHal)m(N)n wherein M is a cation of a complexing metal, SR is an organic or inorganic acid residue, L is a chelating ligand, B is a Lewis base, PHal is an ion of a pseudohalide, N is a nitrogen base, x is an integer from 1 to 8, y is an integer from 1 to 5, z is an integer from 7 to 8, m is an integer from 2 to 3 and n is an integer from 1 to 2.

The present invention is directed to a process for the preparation of N-aryl amine compounds. The process of the present invention involves reacting a compound having an amino group with an arylating compound in the presence of a base and a transition metal catalyst under reaction conditions effective to form an N-aryl amine compound, the transition metal catalyst comprising a Group 8 metal and at least one chelating ligand selected from the group consisting of bisphosphines having at least one stearically hindered alkyl substituent. The formed products are valuable intermediates in the pharmaceutical and polymer fields.

This invention relates to novel quinoline-based divalent metal ion chelating ligands of Formula I,

wherein A or B are independently —CR⁷R⁸, or —CH(R⁹)CH(R¹⁰). X is hydrogen, C₁-C₁₀ alkyl; —OH, or —NR¹¹R¹². R¹ to R¹² are various substituents selected to optimize the physicochemical and biological properties such as enzyme binding, tissue penetration, lipophilicity, toxicity, bioavailability, and pharmacokinetics of compounds of Formula 13. R¹ to R¹² may include, but are not limited to hydrogen, alkyl, acyl, hydroxyl, hydroxyalkyl, substituted or unsubstituted aryl, amino, aminoalkyl, alkoxyl, aryloxyl, carboxyl, halogen, alkoxycarbonyl, cyano, and other suitable electron donating or electron withdrawing groups. The compounds of the present invention are useful for inhibiting the activity of viral enzymes responsible for the proliferation of human immunodeficiency virus (HIV).

This invention relates to a transition metal compound represented by the formula:

wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; E is: 1) a substituted or unsubstituted indenyl ligand that is bonded to Y through the four, five, six or seven position of the indenyl ring, or 2) a substituted or unsubstituted heteroindenyl ligand that is bonded to Y through the four, five or six position of the heteroindenyl ring, provided that the bonding position is not the same as the position of the ring heteroatom, or 3) a substituted or unsubstituted fluorenyl ligand that is bonded to Y through the one, two, three, four, five, six, seven or eight position of the fluorenyl ring, or 4) a substituted or unsubstituted heterofluorenyl ligand that is bonded to Y through the one, two, three, four, five or six position of the heteroindenyl ring, provided that the bonding position is not the same as the position of the ring heteroatom; A is a substituted or unsubstituted cyclopentadienyl ligand, a substituted or unsubstituted heterocyclopentadienyl ligand, a substituted or unsubstituted indenyl ligand, a substituted or unsubstituted heteroindenyl ligand, a substituted or unsubstituted fluorenyl ligand, a substituted or unsubstituted heterofluorenyl ligand, or other mono-anionic ligand; Y is a Group 15 or 16 bridging heteroatom substituent that is bonded via the heteroatom to E and A; and X are, independently, univalent anionic ligands, or both X are joined and bound to the metal atom to form a metallocycle ring, or both X join to form a chelating ligand, a diene ligand, or an alkylidene ligand. This invention further relates to catalyst systems comprising the above transiotioon metal compounds, activators and optional supports and their use to polymerize or oligomerize olefins.

A novel binuclear metal complex according to the present invention is an asymmetric binuclear metal complex represented by the general formula: (L¹)₂M¹(BL)M²(L²)₂(X)_n, wherein M¹ and M², which may be identical or different, represent a transition metal; L¹ and L², which are different, represent a chelate ligand capable of polydentate coordination and two L¹s may be different and two L²s may be different; BL represents a bridge ligand having at least two heteroatom-containing cyclic structures, the heteroatoms contained in the cyclic structures being ligand atoms coordinating to M¹ and M²; X represents a counter ion; and n is the number of counter ions needed to neutralize the charge of the complex. And the binuclear metal complex is useful as a metal complex dye.

The invention relates to luminescent novel material synthesis technologies and particularly relates to blue-green materials with novel tri/tetra-coordination dual-core copper [I] coordination compounds and a preparation method thereof. According to the preparation method, the novel dual-core copper [I] coordination compound blue-green materials, namely [Cu2[bmptzH][[mu]-dppm]2][ClO4]2 and [Cu2[fptz][[mu]-dppm]2][ClO4], which simultaneously have two coordination bonding manners, namely tri-coordination and tetra-coordination, and have special structures, are synthesized from functionalized pyridine triazole bidentate chelating ligands (5-tert-butyl-3-[6-methyl-pyridine-2-yl]-1,2,4-triazole and 5-trifluoromethyl-3-[pyridine-2-yl]-1,2,4-triazole) and an organic diphosphine auxiliary ligand (bis[diphenylphosphino]methane). The blue-green materials show very good photoluminescence properties in a solid state, and the photoinduced quantum efficiency is 66% and 77% respectively.

The invention discloses high-temperature hyper-salinity water-base fracturing fluid consisting of thickening liquid, a cross-linking agent and a gel breaker, wherein the thickening liquid comprises the following components in percentage by weight: 0.4-0.7% of a thickening agent, 0.1-0.8% of a cleanup additive, 0.01-0.1% of a sterilizing agent, 0.1-0.3% of a temperature stabilizing agent, and the balance of hyper-salinity seawater or stratum produced water; the thickening agent is sulfonyl hydroxypropyl guar gum, sulfonyl betaine amphoteric guar gum or sulfonyl carboxymethyl guar gum; the cross-linking agent is a stable complex formed from reaction of 9-18% of a zirconium compound, 3-40% of a boron compound, 9-18% of a chelating ligand and 5-19% of a bridging ligand by mass; the gel breaker is either ammonium persulfate or sodium persulfate. The fracturing fluid is directly prepared from hyper-salinity water and realizes effective utilization of seawater and hyper-salinity produced water from land, and is applicable to seaborne and terrestrial high-temperature oil-gas wells.

A novel chemical compound has a general formula (LX)_nY wherein X is selected from a group consisting of a group 13 element other than boron, Y is selected from a group consisting of a halide, a chlorate, a sulfate and a nitrate and L is a chelating ligand containing two nitrogen and two oxygen donor groups where n=1 or 2.

The invention relates to a dinuclear copper [1] complex luminescent material containing pyridine pyrazole chelating ligand and a preparation method thereof. By the application of the functional pyridine pyrazole two-tooth chelating ligand (3-[2-pyridyl] pyrazole [pypzH for short] or 5-tertiary butyl-3-[2-pyridyl] pyrazole [pybpzH for short] or 5-trifluoromethyl-3-[2-pyridyl] pyrazole [pyfpzH for short] and organic double phosphine auxiliary ligand (1,4-double[diphenylphosphine] butane [dppb for short]), a kind of pyridine pyrazole dinuclear copper [1] complex luminescent material [Cu2[pypzH]2[u-dppb]2][ClO4]2,[Cu2 [pybpzH]2[u-dppb]2][ClO4]2 and [Cu2[pyfpzH]2[u-dppb]2][ClO4]2 is prepared. The solid state luminescence property of the luminescent material can be regulated and controlled through the change of the substituent group on the pyridine and pyrazole ring, the maximum values of the solid state luminescence wave length of the luminescent material are 500 nm, 505 nm and 494 nm, the solid state luminescence life of the luminescent material is 48 us, 19 us and 36 us, and the solid state luminescence quantum efficiency of the luminescent material is 74%, 6% and 85%.

The invention discloses a method for preparing polyvinylidene fluoride/aluminum oxide hybridization film, comprising taking polyvinylidene fluoride to be dissolved into solvent; after fully dissolving the polyvinylidene fluoride, adding aluminium isopropoxide and coupling agent into the solution in a stirring state; adding water for hydrolyzation, adding acid for catalysis, and then adding pore-forming agent; stirring for at least 20h to obtain even casting film liquid, and standing still at the room temperature; scraping the casting film liquid into a panel film at the room temperature, placing the panel film in the air, soaking in coagulating bath, and forming a hyperfiltration film; and soaking the hyperfiltration film in the water, and taking out to be dried. The method uses strong chelating ligand and high activity aggregation group to respectively carry out chemical modification on PVDF organic macromolecule and Al2O3 inorganic precursor, so that the hybridization film prepared by a sol-gel method maintains the excellent chemical stability and mechanical performance of a PVD film; furthermore, the hydrophilicity and the film contamination resistance of the hybridization film are added, so that the separation property and the stability of the film can be remarkably improved.

This invention relates to a luminescent lanthanide chelate comprising a lanthanide ion and a chelating ligand of formula (I)

wherein

R₁ is selected from the group consisting H, —COOH, —COO⁻, —CH₂COOH and —CH₂COO⁻; G₁ is a group consisting of one or two moieties each moiety being selected from the group consisting of ethynediyl, ethenylene, phenylene, biphenylene, naphthylene, pyridylene, pyrazinylene, pyrimidinylene, pyridazinylene, furylene, thienylene, pyrrolylene, imidazolylene, pyrazolylene, thiazolylene, isothiazolylene, oxazolylene, isoxazolylene, fyrazanylene, 1,2,4-triazol-3,5-ylene and oxadiazolylene; G₂ for coupling to a biospecific binding reactant is selected from the group consisting of amino, aminooxy, carbonyl, aldehyde or mercapto groups and activated forms made of them; Z is selected from the group consisting of carboxyalkyl amine, ether, thioether, carbonyl and unsubstituted or substitute methyl (—CR₂—) wherein group R₂ is selected from the group consisting of H, methyl, ethyl and carboxylalkyl; and the lanthanide ion is europium(III), terbium(III), dysprosiym(III) or samarium(III). This invention further relates to a detectable molecule comprising the lanthanide chelate and the use of the molecule in a method of carrying out a biospecific binding assay.

The light emitting element includes a first electrode and a second electrode, between which a light emitting layer, a hole transporting layer provide in contact with the light emitting layer, an electron transporting layer provided in contact with the light emitting layer, and a mixed layer provided between the electron transporting layer and the second electrode. The mixed layer includes an electron transporting substance and a substance showing an electron donating property with respect to the electron transporting substance. The light emitting layer includes an organometallic complex represented in General Formula (1) and a host. R¹ and R² each represent an electron-withdrawing substituent group. R³ and R⁴ each represent any of hydrogen or an alkyl group having 1 to 4 carbon atoms. L represents any of a monoanionic ligand having a beta-diketone structure, a monoanionic bidentate chelating ligand having a carboxyl group, or a monoanionic bidentate chelating ligand having a phenolic hydroxyl grou

A method for the protection of wood and other wood materials without affecting dimensional stability or surface integrity of the treated material is described. The method involves treating wood material with an iron salt and selected oxidants where the iron salt is preferably complexed with organic chelating ligands. Preferably, a microbicidal agent is also incorporated into the method to provide treated wood products that demonstrate excellent surface integrity, dimensional stability and retention of the infused microbicidal agents for extended periods of time without incurring the detrimental environmental effects of conventional chromium or copper-based inorganic salt preservation methods.

The invention discloses a cross-linking agent applicable to highly-mineralized water fracturing fluid. The cross-linking agent is stable complex which is formed by reaction of a zirconium compound, a boron compound with a chelating ligand and bridging ligand in aqueous liquor. The zirconium compound is zirconium acetate or zirconium oxychloride with content of 9wt%-18wt%; the boron compound is boric acid or borax with content of 3wt%-40wt%; the chelating ligand is N, N-di(2-hydroxyl ethyl) glycine with content of 9wt%-18wt%; the bridging ligand is one, two or a mixture of more than two of glycerol, mannitol, sorbitol and triethanolamine, with content of 5wt%-19wt%, and the balance of water. The cross-linking agent disclosed by the invention can be cross-linked with a thickening agent under a weakly alkaline condition, not only contains heavy metal zirconium, but also contains boron, so that damages to stratums by the fracturing fluid are effectively lowered; moreover, highly-mineralized water can be adopted to directly prepare the fracturing fluid, so that fresh water resources are saved, and expenditure cost of oilfield enterprises in treating and producing highly-mineralized water is reduced.

The present invention relates to novel group VIII transition metal complexes represented by the formula (I) as: wherein M is the central transition metal; +Z represents a semilabile anionic chelating ligand; R1, R2 & R3 are substituents on the phosphine ligand, X is chosen from sulphonato, carboxylato, formato group or halides and 1<n<10. The invention also provides a process for the preparation of said transition metal complex.

The present invention discloses a transition metal complex having carbene ligands. The disclosed transition metal complex has a structure of a center transition metal surrounded by two identical carbene ligands and one double-chilating ligand which is a nitrogen-contain heteroaryl group compound with pyridyl group. The disclosed transition metal complex can be represented by the following formula:

The invention provides an efficient nano negative ion releasing agent and a preparation method thereof and relates to the field of negative ion releasing materials. The negative ion releasing materials are widely applied to the fields of ceramics, coatings, plastics, spinning, decoration and the like, currently, most negative ion releasing materials are tourmaline and excite negative ion release by adding a large amount of rare earth or composite salt, radioactivity and heavy metal content of the most negative ion releasing materials exceed standard easily, the negative ion release is unstable, and the release efficiency is low. In order to overcome defects in the prior art, the efficient nano negative ion releasing agent is provided and is characterized by being prepared from raw materials in parts by mass as follows: 50-80 parts of the negative ion releasing material, 30-50 parts of an excitation material, 5-28 parts of an energy transfer material and 1-6 parts of a chelating agent. The efficient nano negative ion releasing agent and the preparation method have beneficial effects as follows: the efficient nano negative ion releasing agent is prepared through comprehensive adoption of a nano grinding technology and combination of piezoelectricity and pyroelectricity of the negative ion releasing material as well as chelating ligands of the excitation material and the energy transfer material with a chelating agent.

The invention discloses a colorimetric method for detecting lead ions, and specifically relates to a method for detecting lead ions by taking gold nanoparticles as a colorimetric probe. AuNPs(Cys-AuNPs) is modified by l-cysteine, and Cys can capture Pb<2+> by the binding function of a chelating ligand under the induction of Pb<2+>, so that Cys-AuNPs is aggregated, and thus the color of a solution changes, and the change in position and intensity of an AuNPs characteristic peak is caused. The colorimetric method has a detection range of 0.02- 5 microns, and detection limit of 0.02 microns, has the advantages of simplicity, economy, good selectivity (potassium thiocyanate as a screening agent) and the like, and can be used for detecting Pb<2+>.

The present application discloses a luminescent lanthanide chelate of formula (I)

with lanthanides such as europium, as well as the corresponding luminescence lanthanide chelating ligand. The application also discloses a detectable molecule comprising a biospecific binding reactant (such as an antibody) conjugated to the luminescent lanthanide chelate as well as a method of carrying out a biospecific binding assay, the use of such a detectable molecule in a specific bioaffinity based binding assay utilizing time-resolved fluorometric determination of a specific luminescence, and a solid support material conjugated with the luminescent lanthanide chelate.