176 results about "Electronic effect" patented technology

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.

Devices and methods for detecting the constituent parts of biological polymers are disclosed. A molecular analysis device comprises a molecule sensor and a molecule guide. The molecule sensor comprises a single electron transistor including a first terminal, a second terminal, and a nanogap or at least one quantum dot positioned between the first terminal and the second terminal. A nitrogenous material disposed on the at least one quantum dot is configured for an interaction with an identifiable configuration of a molecule. The molecule sensor develops an electronic effect responsive to the interaction. The molecule guide is configured for guiding at least a portion of the molecule substantially near the molecule sensor to enable the interaction.

A molecular analysis device comprises a molecule sensor and a nanopore that passes through, partially through, or substantially near the molecule sensor. The molecule sensor may comprise a single electron transistor including a first terminal, a second terminal, and a nanogap or at least one quantum dot positioned between the first terminal and the second terminal. The molecular sensor may also comprise a nanowire that operably couples a first and a second terminal. A nitrogenous material that may be disposed on at least part of the molecule sensor is configured for a chemical interaction with an identifiable configuration of a molecule. The molecule sensor develops an electronic effect responsive to a molecule or responsive to a chemical interaction.

The invention relates to a dark red/near-infrared multifunctional aggregation-induced light-emitting material, a preparation method and application thereof. According to the dark red/near-infrared multifunctional aggregation-induced light-emitting material, a pyridine ring in the molecular structure endows the molecule with electropositivity, and meanwhile, the molecule has appropriate lipo-hydropartition coefficient (with ClogP being greater than 3 and less than 5) and space structure, and is beneficial to combination with gram-positive bacteria. During co-culture of the molecule with bacteria, specific "lightening" imaging of gram-positive bacteria can be realized; the strong electron donating (D)-electron withdrawing (A) effect of the molecule itself causes absorption and emission wavelength red shift of the molecule, thus having dark red/near-infrared fluorescence emission and strong ROS generation capacity. Meanwhile, the aggregation-induced light-emitting material provided by the invention can efficiently kill gram-positive bacteria.

The invention discloses a fluorescent probe used for detecting glutathione as well as a preparation method and application thereof. According to the invention, 1, 8-naphthalimide is used for building a classical ICT system, a phenyl sulfone part is introduced to the position of 4-, the ICT effect of a probe molecule is regulated and controlled, and due to the strong attracting electron effect of the phenyl sulfone in the position of the 4-, the probe molecule self is free from fluorescence emission. In case of the existence of glutathione, the phenyl sulfone part can be replaced by the glutathione, further the intramolecular electron transfer from sulphur atom in the position of the 4- (from glutathione) to the 1,8-naphthalimide can be generated, moreover, the ICT effect enables the probe molecule to send out strong fluorescence. The fluorescent probe provided by the invention can realize detection to the glutathione in cells, and has the advantages of being convenient and simple to operate, low in cost, sensitive in response, easy for popularization and application and the like.

The invention discloses an ionic iron (III) complex containing bisphenol functional imidazoline salt, which is expressed by the following chemical structural formula shown in the specification, wherein R1 and R2 are respectively one of hydrogen atom, methyl and tert-butyl; and X is one of chlorine or bromine. According to the ionic iron (III) complex containing bisphenol functional imidazoline salt, such structural unit as imidazoline is first introduced into the design and synthesis of a ligand; meanwhile, the flexible and variable regulation and control on the steric hindrance and electronic effect of the corresponding iron (III) complex is realized by introducing a structure-variable phenoxy modification radical onto the imidazoline ring, thus developing a novel efficient iron-based catalyst; and the cross coupling reaction of alkyl primary/secondary bromohydrocarbon and alkyl primary/secondary chlorohydrocarbon can be effectively catalyzed.

The present invention relates generally to chip packaging and methods of packaging and, more particularly, to compact packaging of chips and methods thereof in electronic environments that minimize undesired electronic effects, promote speed, and enhance packaging versatility.

The present invention provides a method of manufacturing a hydrogel comprising the step of crosslinking a biopolymer using a carbodiimide crosslinker of Formula I wherein at least one of R¹ and R² is a functional group that is a bulky organic functional group. R¹ and R² can each independently be an optionally substituted saturated or unsaturated functional group selected from the group consisting of an alkyl, a cycloalkyl, a heterocyclic, and an aryl. The bulky organic functional group will slow down the crosslinking reaction of carbodiimide due to the steric effects and/or electronic effects, in comparison to a crosslinking reaction using EDC. Also provided are the hydrogels and ophthalmic devices prepared using the method of the invention and uses thereof.

The invention discloses application of o-methyl-anilino lithium in the catalysis of aldehyde and borane hydroboration. Borane is added into a reaction bottle that is dewatered and deoxidized in an inert gas atmosphere in an anhydrous oxygen-free environment; the catalyst, o-methyl-anilino lithium, is added; mixing is performed well before an aldehyde is added; hydroboration is carried out; the reaction is ended after exposure to air so as to obtain borates; the aldehyde is selected from aromatic aldehydes and heterocyclic aldehydes. The catalyst disclosed herein is well applicable to aromaticaldehydes and heterocyclic aldehydes having different substitution positions and electronic effects; more choices are provided to attain borates with different substituent structures.

The invention relates to an electronic-clogging experiment device of a geotextile. The device consists of three parts, namely, a penetration test main body device consisting of an experiment table, a permeameter, a piezometer tube and a water head scale, a constant water head supply device consisting of a bracket, an auxiliary water inlet container, a valve, a water supply tube, a constant water head inlet container, a water outlet tube, a constant water head outlet container and an overflowing tube, and a voltage loading device consisting of a direct current power supply, an insulating lead, a metal bolt and a drilling circular metal electrode. By using the penetration test main body device and the penetration test main body device, continuous hydraulic power penetration tests with different hydraulic power gradients can be performed to the geotextile, and continuous electric penetration tests with different hydraulic power gradients can be performed to the geotextile by applying a uniform direct current electric field inside the permeameter through the voltage loading device, so that the influence on the clogging of the geotextile caused by electronic effect can be studied.

The invention discloses a high-performance oxygen reduction catalyst based on surface function enhancement provides a preparation method of the above catalyst. The catalyst is a HCM/Pt/C catalyst witha core-shell structure, the material of the shell is a porous heteroatom-doped carbon material coating the surface of a Pt active center. Since the heteroatom-doped carbon material has a special adsorption-enrichment effect on oxygen, the material can provide an oxygen-rich environment for an active site, the collision frequency of reaction gas oxygen and the active site is increased, and the kinetic reaction rate of an oxygen reduction reaction is greatly improved. At the same time, the electronic effect at a HCM/Pt interface optimizes the electronic structure of Pt, so that the adsorption of Pt on an oxygen reduction reaction intermediate is weakened, and the desorption rate is increased to provide a site for subsequent oxygen adsorption. On the other hand, a carbon shell around Pt particles prevents migration and agglomeration, and the overall stability of the catalyst is greatly improved.

The invention relates to a preparation method and application of a catalyst for an olefin polymerization reaction, especially to a preparation method and application of silicon-bridged metallocene complexes containing an indenoindole structure. According to the invention, molecules of the novel silicon-bridged metallocene complex containing the indenoindole structure designed by the invention contain various different substituted indenyl groups, so different chemical environments are provided for central metal, and metallocene complexes with a novel structure is constructed. By changing a skeleton structure and substituent groups, the three-dimensional effect and the electronic effect of the metallocene complex can be conveniently regulated and controlled, catalytic performance is regulated and controlled, and polyolefin high polymer materials with different structures and properties are prepared.

The invention discloses application of n-butyllithium in catalyzing hydroboration of aldehyde and borane, a method of hydroboration comprises the following steps of in a water-free and oxygen-free environment, under the inert gas atmosphere, adding borane into a reaction bulb subjected to dehydration and deoxidization treatment, then adding a catalyst n-butyllithium, uniformly mixing, then addingaldehyde to perform hydroboration. Exposing to the air to stop the reaction after the reaction is finished, so as to obtain a product. The catalyst disclosed by the invention has better universality to aromatic aldehyde with different replace positions and different electronic effects as well as to heterocyclic aldehydes and fatty aldehyde, and more choice can be provided for obtaining boric acidester compounds with different substituent group structures.

The invention provides a post-processing method for carbon-supported Pt-Fe catalyst, belongs to the field of catalyst post-processing methods, and overcomes the defects that the conventional post-processing method for the carbon-supported Pt-Fe catalyst is harsh in conditions and complex. The method comprises the following steps: immersing the carbon-supported Pt-Fe catalyst into sulfuric acid solution, and stirring at 70 to 90 DEG C to obtain suspension liquid; cooling, washing and drying the suspension liquid to obtain chemically de-alloyed carbon-supported Pt-Fe catalyst. According to the method, Fe on the surfaces of carbon-supported Pt-Fe nano-particles is removed in the sulfuric acid solution by controlling reaction conditions, the catalytic oxidation effect of Pt on methanol is improved by utilizing the strong electronic effect of the Fe in the carbon-supported Pt-Fe catalyst on the Pt, and meanwhile, the problem that the stability of the Pt-Fe catalyst is low is solved. The quality specific activity of the chemically de-alloyed carbon-supported Pt-Fe catalyst prepared by the invention can reach 514 mA/mg<2>; through four-hour timing current test, 45.4 percent of catalytic performance can be remained.

The invention discloses a novel oxygen evolution electrocatalyst as well as a preparation method and application thereof, which comprises the following steps: (1) dissolving nitrate of metal elementsin a P region into a solvent to obtain a solution A, dissolving thiourea in a solvent to obtain a solution B, dropwise adding the solution B into the solution A, fully stirring and uniformly mixing the mixture, and transferring the mixture into a reaction kettle; and (2) vertically putting the cleaned and dried metal Ni foam into a reaction kettle, carrying out solvothermal reaction to obtain a heterojunction, repeatedly washing the heterojunction with deionized water and ethanol for several times, and drying the product in a vacuum box to obtain the novel oxygen evolution electrocatalyst. According to the preparation method, the electro-catalytic performance is remarkably improved by a P-region element asymmetric SP3 hybridization induced electron effect; by means of a simple, convenientand mild solvothermal method, a Ni foam net is used as a substrate and a Ni source, and a P-region element Bi or Sb induces to prepare a flexible self-assembled succulent Bi2S3/Ni3S2/NF or Sb2S3/Ni3S2/NF heterojunction working electrode for electrocatalytic oxygen evolution reaction. The Bi2S3 or Sb2S3 has a unique asymmetric SP3 hybrid modulation heterojunction electronic structure, so that the electro-catalytic performance is improved.

The present invention relates to a (E)-alkenyl sulfone compound and a preparation method thereof. The preparation method comprises: dissolving a benzenesulfonyl hydrazide-based substrate and a phenylpropiolic acid substrate in an organic solvent, adding a copper catalyst, and carrying out a reaction by using oxygen in air as an oxidizing agent so as to obtain the (E)-alkenyl sulfone compound, wherein the chemical formula is defined in the specification. Compared to the method in the prior art, the method of the present invention has the following characteristics that the finally required (E)-alkenyl sulfone compound can be obtained with the inexpensive catalyst Cu2O and the green oxidant O2 without the additional additives, and the method provides good compatibility for the substrates having different electronic effects and steric hindrance on the aromatic ring, and has high yield.

The invention relates to a brand new method for predicting the acid-base dissociation constant (pKa) of organic small molecules based on a hierarchical atom additive model. Based on the linear relationship rule of free energy changes of acid-base dissociation balance at a given temperature, the method firstly establishes the hierarchical atom additive model based on a Hammett-Taft equation and a processed substituent effect of 'dissociation center-rest part' brought forward by Cherkasov and the like, and then calculates the acid-base dissociation constant (pKa) value of a corresponding compound according to the concrete structure of the compound through the model. The method does not have the difficulties of large number of substituent electronic effect constants and correction factors relating existing in the prior method, ensures the speediness and accuracy of the prediction, shows good data fitting and predictive ability on a plurality of sample sets, breaks through the prior method which studies the drug pKa at an early research and development stage of a new drug, reduces the drug research and development cost on a large scale, and improves the discovery efficiency of the new drug.

The invention relates to a composite grid field effect transistor. Wherein, the grid, source, leak and substrate form the main body; the insulated layer is between grid and substrate; the groove is on the substrate between source and leak; the source extends shallow source extending area at the left end of groove; the grid extends shallow leak extending area at the right end; the invention is characterized in that the grid is composite grid and multi-crystal grid, while the left and right parts are different in conductive types; the left grid toward to source is P-type multi-crystal grid, while the left part toward leak is N-type multi-crystal grid. The invention can obtain radio MOSFET driving current, transconductance and cut-off frequency, and release the maximum field strength, thermal electronic effect and short-groove effect at the end of leak drift area.

The invention discloses polyurethane resin for shoes, comprising a component (A) and a component (B). The polyurethane resin for shoes is characterized in that the component (A) comprises 100 parts of polyester polyol and 8-30 parts of ethylene glycol and/or butanediol, the component (B) comprises 40-60 parts of 3,3'-dimethyl-4,4' diphenyl diisocyanate and 30-45 parts of polyester polyol and/or polyether glycol. A finished product prepared by substituting TODI (3,3-Tolidine-4,4-Diisocyanate) for MDI (4,4'-Diphenylmethane Diisocyanate) through a foaming reaction has the matter properties, suchas excellent compression ratio, better wear resistance, bending resistance, tensile strength, tearing strength, and the like under low density. Because of the steric hindrance effect and the electronic effect of 3,3'-dimethyl-4,4'diphenyl diisocyanate methyl-o-side, the activity of the polyurethane resin is weaker than the activity of the diphenylmethane diisocyanate, and the prepared prepolymer is stable and mild in the foaming reaction without generating a bubble falling phenomenon. Because the activity of the TODI reaction is weaker than that of the MDI reaction, the storage stability of the isocyanate combination liquid is greatly improved.