55 results about "Electron delocalization" patented technology

The invention belongs to the technical fields of material preparation and photocatalysis, and discloses a phenyl ring modified graphite-like carbon nitride photocatalyst, and a preparation method and an application thereof. The method comprises the following steps: 1, dissolving nitrogen-containing organic micro-molecules and a phenyl ring-containing compound in a solvent, and evaporating the obtained solution until the solution is dry in order to obtain a mixed precursor; and 2, roasting the mixed precursor to obtain the phenyl ring modified graphite-like carbon nitride photocatalyst, wherein the nitrogen-containing organic micro-molecules are one or more of urea and melamine; and the phenyl ring-containing compound is one or more of trimesic acid, phenol, benzoic acid and benzaldehyde. The electron structure of the photocatalyst is changed by phenyl ring modification, so the pi electron delocalization of graphite-like carbon nitride is excited, the absorption of visible lights is improved, compounding of photon-generated carriers is inhibited, and the photocatalytic hydrogen production performance is improved. The method has the advantages of simple preparation, no expensive device and good practical application prospect.

A halogenated aromatic monomer-metal complex useful for preparing a polymer for electronic devices such as a light-emitting diode (LED) device is described. The aromatic monomer-metal complex is designed to include a linking group that disrupts conjugation, thereby advantageously reducing or preventing electron delocalization between the aromatic monomer fragment and the metal complex fragment. Disruption of conjugation is often desirable to preserve the phosphorescent emission properties of the metal complex in a polymer formed from the aromatic monomer-metal complex. The resultant conjugated electroluminescent polymer has precisely controlled metal complexation and electronic properties that are substantially or completely independent of those of the polymer backbone.

The invention provides a preparation method of surface carbon vacancy modified graphite-phase carbon nitride photocatalyst and an application of the preparation method in the production of hydrogen peroxide. The preparation method has the advantages of cheap and available raw materials, simple technology, green and environmental protection, easy industrial production and the like. Compared with pure-phase g-C3N4, surface carbon vacancy modified g-C3N4 has the advantages that the band gap of g-C3N4 is narrowed and electron delocalization is enlarged due to existence of carbon vacancy, the carbon vacancy becomes the center in charge capture, and the capacity of the surface carbon vacancy modified g-C3N4 to produce H2O2 under the same condition is 14 times that of common g-C3N4 due to existence of the carbon vacancy.

The invention provides a novel aminoketones photoinitiator suitable for UV-LED light source curing. The novel aminoketones photoinitiator can be higher in adsorption in a long-wavelength region (365-395nm), is suitable for UV-LED light source curing, and overcomes the defects of high energy consumption and heavy pollution in traditional curing. The novel aminoketones photoinitiator is good in eectron delocalizability, has high intramolecular electron transfer performance and excellent photoelectric property, is higher in adsorption in the range of 365nm to 395nm in the long-wavelength region, is suitable for a high-power UV-LED ultraviolet photocuring system, and has considerable advantages compared with the photoinitiator in the prior art.

The invention relates to a nitrogen and phosphorus co-doped porous carbon film @ polyaniline hybrid electrode material having an interface covalent bond link, and a preparation method of the hybrid electrode material. The preparation method is characterized in that an anilino methyl triethoxysilane functional porous carbon film and aniline are dispersed into a water solution containing hexadecyl trimethyl ammonium bromide and camphorsulfonic acid, then an ammonium persulfate initiator is added into the dispersed solution, and camphorsulfonic acid-doped polyaniline (PANI) is enabled to be grafted with the surface of the porous carbon fiber film in situ, so that a firm and uniform coating layer having the covalent bond link is formed. Due to the existence of an interface covalent bond, porous carbon fibers having framework stability are effectively and firmly combined with a conductive PANI material with higher pseudocapacitance, the interaction between the porous carbon fibers and the conductive PANI material is enhanced, a larger Pi electron delocalization system is formed, the electron transfer between two phases is also changed into intrachain direct conduction from an interchain jump mode, and the specific capacitance and cyclic stability of the electrode material are further greatly improved; therefore, the nitrogen and phosphorus co-doped porous carbon film @ polyaniline hybrid electrode material is suitable for supercapacitors.

The invention provides a polymer, a preparation method thereof and an organic polymer solar battery. The polymer is shown in a formula (I) or a formula (II). Compared with an existing conjugated polymer, the polymer which is shown in the formula (I) or the formula (II) has the advantages that a condensed ring unit of dithieno carbazole serves as a donor and is low in reorganization energy and good in pi electron delocalization; by introducing the condensed ring unit into a conjugated compound, the reorganization energy of the polymer can be effectively reduced, and the conjugation length of the polymer is increased, so that the mobility of the polymer can be improved, and an optical band gap of the polymer is reduced; the optical band gap is reduced to cause the red shift of an absorption band of the polymer, and absorption spectra are matched with solar spectra. Therefore, by the adoption of the polymer, the spectrum absorption range of the polymer can be expanded, and the hole mobility can be improved; fluoro-isoindigo serves as a receptor, so that the highest occupied molecular orbital (HOMO) energy level of the polymer can be reduced, and the open-circuit voltage of the polymer solar battery is improved.

The invention belongs to the field of solar cells, and discloses a thiophene pyrroledione based co-polymer material, and a preparation method and an application thereof. The co-polymer has the following structural formula (I). In the formula, both R1 and R2 represent a C1-C20 alkyl group and n is an integer ranging from 10 to 100. In the thiophene pyrroledione based co-polymer material provided by the invention, benzo-dithiophene has easily modified photophysical properties, the co-polymer of the benzo-dithiophene present excellent photovoltaic performance; thiophene pyrroledione has a simple, symmetrical and polar structure and is beneficial to electron delocalization when the thiophene pyrroledione is polymerized with other monomers; and the thiophene pyrroledione has relatively strong electron-withdrawing effect that results in reduction of an HOMO energy level and a LUMO energy level, thereby facilitating the increase of an open-circuit voltage. The performance can improve energy conversion efficiency of solar energy, so that the problem of low efficiency of polymer solar cells is solved.

The invention relates to compounds and application thereof. The compounds have a structure represented by a formula (I) in the specification. The compounds are applied to an organic electroluminescentdevice. The organic electroluminescent device comprises a first electrode, a second electrode and at least one organic material layer interposed between the first electrode and the second electrode,wherein at least one organic material layer comprises any one or a combination of at least two selected from the compounds as shown in the formula (I). According to the boron-containing compounds provided by the invention, at least one substituted or unsubstituted C6-C30 aryl group is fused on carbazole, so a conjugate plane is enlarged, electron delocalization is more obvious, a HOMO energy levelis shallower, and a LUMO energy level is deepened, thereby improving the charge transmission performance of a material, balancing carrier transmission, and effectively reducing voltage and improvingluminous efficiency. The compounds are applicable to organic electroluminescent devices.

The invention discloses a graphite-like carbon nitride-based photocatalytic composite material as well as a preparation method and application thereof. The material is a g-C3N4-based photocatalytic composite material of an organic monomer TAPB grafted CN network, the electron hole separation rate of the material can be improved, and the photocatalytic performance of g-C3N4 is improved. The preparation method comprises the following step of carrying out polymerization reaction by taking urea and TAPB as monomers, which specifically comprises the following sub-steps: S1, grinding urea and TAPB;S2, calcining the mixture obtained in the step S1 for 3h to 6h at the temperature of 500 DEG C to 600 DEG C; and S3, cooling the sample obtained in the step S2 to room temperature, and fully grindingagain to obtain the material. A CN network structure is grafted through TAPB, so that pi electron delocalization of the material is enhanced, rapid migration of photo-induced electrons is facilitated,rapid recombination of photo-induced carriers is inhibited, and remarkable improvement of photocatalytic performance is promoted.

The invention discloses a bipyridine bisthiophene blue fluorescent material. The fluorescent material is a bisthiophene organic compound bilaterally coupled with pyridine, and is named as 5,5'-bis(pyridine-3-yl)-2,2'-bisthiophene, the molecular formula is C18H12N2S2, the crystal system is monoclinic, the space group is P2(1)/n, and the unit cell parameters of the compound are as follows: a = 1.09994 nm, b = 0.57419 nm, c = 1.17721, alpha = gamma = 90 DEG, and beta = 103.20 DEG. The blue fluorescent material has the advantages of clear spatial structure, accurate molecular formula, simple synthesis steps, mild reaction conditions, realization of increase of the electron delocalization degree, enhancement of the luminescence performance and improvement of the stability and the solubility byintroducing pyridyl groups to the 5-positions of two sides of the bithiophene, and potential application prospect as a fluorescent material.

The invention provides a polyaniline-porous carbon composite electrode material with interface covalent bond linkage and a preparation method thereof. The preparation method comprises the following steps: taking an active carbon as the base material; performing activating treatment on the base material by nitric acid, and then performing functionalization on the base material by using a coupling agent ND42 containing an aniline group; and performing in-situ polymerization on the aniline on the surface, and obtaining a PANI-AC composite material with the interface covalent bond linkage. The characteristics of the composite material are that based on a covalent bonding strategy, a carbon material with skeleton stability and a conductive PANI material with higher pseudocapacitance are effectively and firmly combined, and the interaction between the two materials is enhanced, which forms a larger pi electron delocalization system, so that the electron transfer between two phases is also transformed from the inter-chain hopping mode into the intrachain direct conduction, so that the properties of electrode materials are improved, which is very suitable for electrode materials for supercapacitors.

The invention belongs to the field of organic semiconductor materials, and discloses a copolymer containing siliconfluorene-benzobis(benzothiadiazole), a preparation method thereof and applications thereof. The copolymer has a general structure formula as follows, wherein R1, R2, R3 and R4 are the same or different C1-C20 alkyl; and n is an integer between 1 and 100. According to the copolymer, the benzobis(benzothiadiazole) is an excellent donor material. The benzobis(benzothiadiazole) has advantages of simple structure, symmetry, good electron delocalization performances, and the like, has a plane structure and is an excellent receptor material. The copolymer formed by the siliconfluorene and the benzobis(benzothiadiazole) can form a strong electron donor-receptor structure, thus facilitating reduction of the energy band gap of a material, thereby expanding the sunlight adsorption scope and increasing the photoelectric conversion rate.

The invention belongs to the field of solar cells, and discloses an isoindigo based co-polymer, and a preparation method and an application thereof. The co-polymer has the following structural formula (I). In the formula, both R1 and R2 represent a C1-C20 alkyl group and n is an integer ranging from 10 to 100. In the isoindigo based co-polymer provided by the invention, alkyl bithiazole is an excellent electron acceptor and is beneficial to electron delocalization, so that solubility property of the polymer can be increased and photoelectric properties of the polymer can be adjusted by connecting the alkyls; and isoindigo contains centrosymmetric pyrrolidone cores, so that an alkylation reaction of N atoms becomes very easily, and the solubility property and the photoelectric properties of the polymer can be adjusted by adjusting groups on the N atoms.

The invention provides an electrolyte and application thereof. The electrolyte comprises a lithium salt, a solvent, an additive A and an additive B, the invention also relates to application of the electrolyte. The electrolyte provided by the invention is a phosphate hexaester electrolyte capable of improving the normal-temperature cycle and low-temperature performance of the battery; according to the electrolyte, a phosphate additive and other film-forming additives are used, a compact protective film can be formed on the surface of an electrode, the performance of a battery under a high-voltage system can be achieved, and the cycle performance of the battery is improved. The electrolyte contains fluorine, sulfonyl and other groups with high electron delocalization, dissociation of lithium salt in a low-temperature environment is facilitated, and the low-temperature performance of the battery can be improved.

The invention relates to a diphenylamino-truxene-BODIPY derivative ternary system organic dye as well as a preparation method and application thereof. A 3-site and 5-site modified BODIPY derivative and a diphenylamine derivative are respectively connected to 2, 7 and 12 sites of truxene through covalent bonds through a chemical reaction to construct a D-A-pi-D molecular system, introduction of diphenylamine is beneficial to pi electron delocalization, intramolecular charge transfer is promoted, so that the photoelectric conversion efficiency of organic dye molecules is improved; the organic dye provided by the invention has strong light absorption capability, and can effectively perform exciton dissociation; the synthesis method provided by the invention is simple, mild in reaction condition, relatively good in selectivity and small in environmental pollution; when the organic dye is used in an organic solar cell, a good effect is obtained, and the photoelectric conversion efficiency can reach 13.32%; and the organic dye can be used in the field of solar cells.

The invention provides a metal organic complex containing a benzimidazole skeleton as well as a preparation method and application of the metal organic complex, and belongs to the technical field of metal organic chemistry and catalysis. The N atom of benzimidazole contains lone pair electrons, has strong coordination ability, can easily form a complex with transition metal, and has diversified coordination configurations. In addition, the complex has a good rigid plane structure, abundant pi electrons and an excellent electron delocalization environment, and the stability of the complex is higher due to the pi-pi accumulation effect of aromatic rings on benzimidazole. According to the invention, an organic compound containing a benzimidazole skeleton and having a structure as shown in a formula I is used as an organic ligand to react with a transition metal compound to obtain the metal organic complex having a structure as shown in a formula II-VI, and the obtained complex can be used as a catalyst to catalyze a reaction for preparing benzoic acid through alcohol dehydrogenation and has good catalytic activity.