1173results about "Nickel organic compounds" patented technology

This invention provides methods and compositions for producing high titer, substantially purified preparations of recombinant adeno-associated virus (AAV) that can be used as vectors for gene delivery. At the onset of vector production, AAV producer cells of this invention typically comprise one or more AAV packaging genes, an AAV vector comprising a heterologous (i.e. non-AAV) transgene of interest, and a helper virus such as an adenovirus. The AAV vector preparations produced are generally replication incompetent but are capable of mediating delivery of a transgene of interest (such as a therapeutic gene) to any of a wide variety of tissues and cells. The AAV vector preparations produced according to this invention are also substantially free of helper virus as well as helper viral and cellular proteins and other contaminants. The invention described herein provides methods of producing rAAV particles by culturing producer cells under conditions, such as temperature and pH, that promote release of virus. Also provided is a quantitative, high-throughput assay useful in the assessment of viral infectivity and replication, as well as in the screening of agent that affect viral infectivity and / or replication.

A precursor for the deposition of a thin film by atomic layer deposition is provided. The compound has the formula MxLy where M is a metal and L is an amidrazone-derived ligand or an amidate-derived ligand. A process of forming a thin film using the precursors is also provided.

The present invention relates to square planar transition metal complexes and their use in organic semiconductive materials as well as in electronic or optoelectronic components.

Methods and apparatus for screening diverse arrays of materials are provided. In one aspect, systems and methods are provided for imaging a library of materials using ultrasonic imaging techniques. The system includes one or more devices for exciting an element of the library such that acoustic waves are propagated through, and from, the element. The acoustic waves propagated from the element are detected and processed to yield a visual image of the library element. The acoustic wave data can also be processed to obtain information about the elastic properties of the library element. In another aspect, systems and methods are provided for generating acoustic waves in a tank filled with a coupling liquid. The library of materials is then placed in the tank and the surface of the coupling liquid is scanned with a laser beam. The structure of the liquid surface disturbed by the acoustic wave is recorded, the recorded disturbance being representative of the physical structure of the library. In another aspect of the invention, a mechanical resonator is used to evaluate various properties (e.g., molecular weight, viscosity, specific weight, elasticity, dielectric constant, conductivity, etc.) of the individual liquid elements of a library of materials. The resonator is designed to ineffectively excite acoustic waves. The frequency response of the resonator is measured for the liquid element under test, preferably as a function of time. By calibrating the resonator to a set of standard liquids with known properties, the properties of the unknown liquid can be determined. An array of library elements can be characterized by a single scanning transducer or by using an array of transducers corresponding to the array of library elements. Alternatively, multiple resonators of differing design may be used to evaluate each element of a library of elements, thus providing improved dynamic range and sensitivity.

Zirconium phosphate particles are synthesized by providing a solution of zirconium oxychloride in an aqueous solvent, adding at least one low molecular weight, oxygen containing, monofunctional, organic additive to the solution, and combining this solution with heated phosphoric acid or a phosphoric acid salt to obtain zirconium phosphate particles by sol gel precipitation.

A process for preparing a hydrocyanation catalyst comprising contacting a bidentate phosphorous-containing ligand with a molar excess of nickel chloride in the presence of a nitrile solvent and a reducing metal which is more electropositive than nickel. Preferably, the nickel chloride is dried before use.

The invention discloses an alpha-nickel diimine compound olefin polymerization catalyst, a preparation method and a method for preparing branched polyethylene. The structural formula of the alpha-nickel diimine compound olefin polymerization catalyst is shown as the formula (I) and the formula (II). The alpha-nickel diimine compound olefin polymerization catalyst has simple preparation method and low cost, and ethylene can be catalyzed to polymerize with high activity at a temperature not lower than 80 DEG C to obtain high molecular weight polyethylene. The polyethylene prepared from the alpha-nickel diimine compound olefin polymerization catalyst by catalyzing has high molecular weight, and the molecular weight can reach higher than 102x kg / mol within the range of 0-80 DEG C.

The invention relates to novel carbene ligands and their incorporated monomeric and resin / polymer linked ruthenium catalysts, which are recyclable and highly active for olefin metathesis reactions. It is disclosed that significant electronic effect of different substituted 2-alkoxybenzylidene ligands on the catalytic activity and stability of corresponding carbene ruthenium complexes, some of novel ruthenium complexes in the invention can be broadly used as catalysts highly efficient for olefin metathesis reactions, particularly in ring-closing (RCM), ring-opening (ROM), ring-opening metathesis polymerization (ROMP) and cross metathesis (CM) in high yield. The invention also relates to preparation of new ruthenium complexes and the use in metathesis.

Compounds, and oligomers of the compounds, are synthesized with cyclic amine ligands attached to a metal atom. These compounds are useful for the synthesis of materials containing metals. Examples include pure metals, metal alloys, metal oxides, metal nitrides, metal phosphides, metal sulfides, metal selenides, metal tellurides, metal borides, metal carbides, metal silicides and metal germanides. Techniques for materials synthesis include vapor deposition (chemical vapor deposition and atomic layer deposition), liquid solution methods (sol-gel and precipitation) and solid-state pyrolysis. Suitable applications include electrical interconnects in microelectronics and magnetoresistant layers in magnetic information storage devices. The films have very uniform thickness and high step coverage in narrow holes.

Novel iron and cobalt complexes of certain novel tricyclic ligands containing a “pyridine” ring and substituted with two imino groups are polymerization and / or oligomerization catalysts for olefins, especially ethylene. Depending on the exact structure of the ligand, and polymerization process conditions, products ranging from α-olefins to high polymers may be produced. The polymers, especially polyethylenes, are useful for films and as molding resins.

One aspect of the present invention relates to ligands for transition metals. A second aspect of the present invention relates to the use of catalysts comprising these ligands in transition metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The subject methods provide improvements in many features of the transition metal-catalyzed reactions, including the range of suitable substrates, reaction conditions, and efficiency.

A method of forming a thin film on a substrate which includes a step of contacting a surface with a precursor compound having a transition metal and one or more alkyl-1,3-diazabutadiene ligands is provided. The resulting modified surface is then contacted with an activating compound.

One aspect of the present invention relates to novel ligands for transition metals. A second aspect of the present invention relates to the use of catalysts comprising these ligands in transition metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The subject methods provide improvements in many features of the transition metal-catalyzed reactions, including the range of suitable substrates, reaction conditions, and efficiency.

Disclosed herein are manganese, iron, cobalt, or nickel complexes containing terdentate pyridine diimine ligands and their use as efficient and selective hydrosilylation catalysts.

New ligands and compositions with bridged bis-aromatic ligands are disclosed that catalyze the polymerization of monomers into polymers. These catalysts with metal centers have high performance characteristics, including higher comonomer incorporation into ethylene / olefin copolymers, where such olefins are for example, 1-octene, propylene or styrene. The catalysts also polymerize propylene into isotactic polypropylene.

This invention provides metal complexes being useful as catalyst components in metathesis reactions and in reactions involving the transfer of an atom or group to an ethylenically or acetylenically unsaturated compound or another reactive substrate and, with respect to a sub-class thereof, for the polymerisation of α-olefins and optionally conjugated dienes, with high activity at moderate tempera-tures. It also provides methods for obtaining polymers with very narrow molecular weight distribution by means of a living reaction. It also provides methods for making said metal complexes and novel intermediates involved in such methods. It further provides derivatives of said metal complexes which are suitable for covalent bonding to a carrier, the product of such covalent bonding being useful as a supported catalyst for heterogeneous catalytic reactions. It also provides a direct one-step synthesis of pyrrole, furan and thiophene compounds from diallyl compounds.

Disclosed herein are metal-terpyridine complexes and their use in hydrosilylation reactions.

Metal complexes that exhibit multiple radiative decay mechanisms, together with methods for the preparation and use thereof.

The invention discloses a method for rapidly synthesizing a BTC (1,3,5-benzenetricarboxylic acid)-based nanoscale organometallic framework material at room temperature. The nanomaterial is prepared by the following steps: mixing metal acetate aqueous solution with BTC solution at room temperature, and reacting to obtain BTC-based organometallic framework nanoparticles. The method is rapid, simple and energy-saving; the yield is high; the used raw materials and solvents are inexpensive and easily available; the safety problem of commonly used nitrate is not caused; the method is favorable to the industrial production and has wide application prospects in the fields of catalysis, adsorption, drug carriers, building of nano devices and the like.

Highly luminescent nanostructures, particularly highly luminescent quantum dots, are provided. The nanostructures have high photoluminescence quantum yields and in certain embodiments emit light at particular wavelengths and have a narrow size distribution. The nanostructures can comprise ligands, including C5-C8 carboxylic acid ligands employed during shell formation and / or dicarboxylic or polycarboxylic acid ligands provided after synthesis. Processes for producing such highly luminescent nanostructures are also provided, including methods for enriching nanostructure cores with indium and techniques for shell synthesis.

The invention provides a coordination polymer material with a multistage pore passage structure and a preparation method thereof. The coordination polymer material with a multistage pore passage structure is internally provided with the multistage pore passage structure, the multistage pore passage structure is a microporous and / or mesoporous and / or macroporous multistage pore passage structure which is formed by the self assembly between the metal ion and the organic ligand, the apertures of the micropores are less than or equal to 2nm, the apertures of the mesopores are from 2nm to 50nm, and the apertures of the macropores are more than 50nm. The coordination polymer material with a multistage pore passage structure is large in specific surface, the large-size organic ligand does not need to be synthesized, and the coordination polymer material with larger porous sizes can be obtained without the template agent and the pore assisting agent, so that the invention is simple in preparation method, and low in cost.

The present invention discloses a class of catalysis systems for preparing highly branched alkanes by using olefins. The catalysis systems comprise a class of novel nickel complexes and palladium complexes. With effects of the catalysis systems, only mild conditions are required to efficiently obtain oily highly branched alkane mixtures by using ethylene and other olefins, wherein the alkane mixtures have a low bromine value, and can be used for processing aids, and high-performance base oil of lubricants,. The present invention further provides a preparation method for catalysts, and a preparation method for oily olefin polymers.

Catalysts and catalyst systems useful for the olefin polymerization and copolymerization, and their synthesis procedure and usage are disclosed. These catalyst are a kind of novel complexes formed by transition metal from Group III to Group XI and multidentate ligand having the following formula:

The present invention relates to a diazadiene (DAD)-based metal compound, to a method for preparing the same and to a method for forming a thin film using the same. The diazadiene (DAD)-based metal compound of the present invention is provided in a gaseous state to be formed into a metal thin film or a metal oxide thin film by chemical vapor deposition or atomic layer deposition. Particularly, the diazadiene-based organic metal compound of the present invention has advantages in that it may be formed into a metal thin film or a metal oxide thin film and it can be prepared in a relatively inexpensive way without using highly toxic ligands.