An efficient Cu catalyzed selective arylation/annulation cascade reaction of 2-alkynylanilines with diaryliodonium salts was developed.This reaction was selective to N-arylation instead of C-arylation,which provides a...An efficient Cu catalyzed selective arylation/annulation cascade reaction of 2-alkynylanilines with diaryliodonium salts was developed.This reaction was selective to N-arylation instead of C-arylation,which provides a simple synthetic method for N-aryl indoles.展开更多
The binuclear complex [Ag2(m-Ph2PNHPPh2)3](ClO4)2CH2Cl2CH3OH (Ph2PNHP- Ph2 = bis(diphenylphosphino)amine) was prepared from the reaction of AgClO4 with bis- (diphenylphosphino)amine in equimolar ratio through self-ass...The binuclear complex [Ag2(m-Ph2PNHPPh2)3](ClO4)2CH2Cl2CH3OH (Ph2PNHP- Ph2 = bis(diphenylphosphino)amine) was prepared from the reaction of AgClO4 with bis- (diphenylphosphino)amine in equimolar ratio through self-assembly. The coordination cation affords a triply-bridging [Ag2L3]-type coordination moiety. The silver atom is in a trigonal planar environment with P3 coordination chromophore. The complex (C74H69Cl4N3O9P6Ag2) crystallizes in monoclinic, space group Cc with a = 18.3738(1), b = 20.0207(4), c = 20.5422(4) ? b = 95.829(1), V = 7517.5(2) 3, Z = 4, Mr = 1687.68, Dc = 1.491 g/cm3, F(000) = 3432, m = 0.848 mm-1, the final R = 0.0460 and wR = 0.0935 for 7005 observed reflections with I > 2s(I).展开更多
It is investigated the interaction of Ge（IV） with bis（2,3,4-trigodroksifenolazo） benzidine （R） in the presence of KSAS （cationic surface active substances）-CPCl （cetylpyridinium chloride）, CPBr （cetylpyridi...It is investigated the interaction of Ge（IV） with bis（2,3,4-trigodroksifenolazo） benzidine （R） in the presence of KSAS （cationic surface active substances）-CPCl （cetylpyridinium chloride）, CPBr （cetylpyridinium bromide） and CTMABr （cetyltrimethylammonium bromide）. It is studied the effect pH, time on the formation of ternary complexes. It is determinated of molar absorption coefficients and stability constants of germanium. Binary （Ge-R） and triple （Ge-R-CPCI, Ge-R-CPBr, Ge-R-CTMaBr） complex form at pH 4 and pH 1, respectively. The composition proportion of binar system is 1：2 and the composition proportion triple complex is 1：1：2. The concentration interval of germanium which obeying beer low in the Ge-R 0.12-2.92 mkq/mL, in the Ge-R-CPCI is 0.04-1.46 mkq/mL, in the Ge-R-CPBr is 0.00-1.00 mkq/mL and in the Ge-R-CTMaBr is 0.00-1.00 mkq/mL. Molar absorbtivities of complexes are 45,000, 57,000, 59,000 and 60,000, respectively. The effect of interfering ions and masking agents has been learned. Stability constants of complexes have been determined： lgKl = 7.21 ＋ 0.06 （Ge-R）,＇ lgK1 = 12.08 _＋ 0.05 （Ge-R-CPCI）, lgK1 = 12.12 ＋ 0.07 （Ge-R-CPBr） and lgK1 = 12.85 ＋ 0.06 （Ge-R-CTMaBr）. It is developed highly selective method of photometric determination of trace amounts of Ge（IV） in petroleum coke.展开更多
Traditional methods for detecting lactoperoxidase （LP） are complex and time-consuming, so a test strip was made based on the enzymatic reaction principle to enable quick and convenient detection of LP in raw milk. I...Traditional methods for detecting lactoperoxidase （LP） are complex and time-consuming, so a test strip was made based on the enzymatic reaction principle to enable quick and convenient detection of LP in raw milk. In this study 0.1 mol/L citric acid （CA）/0.2 mol/L disodium hydrogen phosphate （NAP） buffer solution （pH 5.0）, 22 mmol/L 3,3＇,5,5＇-tetramethylbenzidine （TMB）, 0.6 mmol/L hydrogen peroxide （H202）, and 0.5% Tween-20 or 0.3% cetyltri- methyl ammonium bromide （CTAB） were optimal for preparing a quick, sensitive, and accurate LP test strip. The coefficient of variation （CV） of the estimated LP concentrations ranged from 2.47% to 6.72% and the minimum LP concentration detected by the test strip was 1-2 mg/L. Estimates of active LP in sixteen raw milk samples obtained using the test strip or the TMB method showed a good correlation （c=0.9776）. So the test strip provides a quick, convenient, and accurate method for detecting the LP concentration of raw milk.展开更多
基金supported by the Intercollegiate Key Scientific Research Projects of Henan Province(15A150018)~~
文摘An efficient Cu catalyzed selective arylation/annulation cascade reaction of 2-alkynylanilines with diaryliodonium salts was developed.This reaction was selective to N-arylation instead of C-arylation,which provides a simple synthetic method for N-aryl indoles.
基金This work was supported by NNSFC (No. 20171044) and the project for "undred Talents from" the Chinese Academy of Sciences
文摘The binuclear complex [Ag2(m-Ph2PNHPPh2)3](ClO4)2CH2Cl2CH3OH (Ph2PNHP- Ph2 = bis(diphenylphosphino)amine) was prepared from the reaction of AgClO4 with bis- (diphenylphosphino)amine in equimolar ratio through self-assembly. The coordination cation affords a triply-bridging [Ag2L3]-type coordination moiety. The silver atom is in a trigonal planar environment with P3 coordination chromophore. The complex (C74H69Cl4N3O9P6Ag2) crystallizes in monoclinic, space group Cc with a = 18.3738(1), b = 20.0207(4), c = 20.5422(4) ? b = 95.829(1), V = 7517.5(2) 3, Z = 4, Mr = 1687.68, Dc = 1.491 g/cm3, F(000) = 3432, m = 0.848 mm-1, the final R = 0.0460 and wR = 0.0935 for 7005 observed reflections with I > 2s(I).
文摘It is investigated the interaction of Ge（IV） with bis（2,3,4-trigodroksifenolazo） benzidine （R） in the presence of KSAS （cationic surface active substances）-CPCl （cetylpyridinium chloride）, CPBr （cetylpyridinium bromide） and CTMABr （cetyltrimethylammonium bromide）. It is studied the effect pH, time on the formation of ternary complexes. It is determinated of molar absorption coefficients and stability constants of germanium. Binary （Ge-R） and triple （Ge-R-CPCI, Ge-R-CPBr, Ge-R-CTMaBr） complex form at pH 4 and pH 1, respectively. The composition proportion of binar system is 1：2 and the composition proportion triple complex is 1：1：2. The concentration interval of germanium which obeying beer low in the Ge-R 0.12-2.92 mkq/mL, in the Ge-R-CPCI is 0.04-1.46 mkq/mL, in the Ge-R-CPBr is 0.00-1.00 mkq/mL and in the Ge-R-CTMaBr is 0.00-1.00 mkq/mL. Molar absorbtivities of complexes are 45,000, 57,000, 59,000 and 60,000, respectively. The effect of interfering ions and masking agents has been learned. Stability constants of complexes have been determined： lgKl = 7.21 ＋ 0.06 （Ge-R）,＇ lgK1 = 12.08 _＋ 0.05 （Ge-R-CPCI）, lgK1 = 12.12 ＋ 0.07 （Ge-R-CPBr） and lgK1 = 12.85 ＋ 0.06 （Ge-R-CTMaBr）. It is developed highly selective method of photometric determination of trace amounts of Ge（IV） in petroleum coke.
基金supported by the National "Twelfth Five-Year" Plan for Science and Technology Support Program of China(No.2013BAD18B06)the Open Research Fund for the Key Laboratory of Dairy Science of Northeast Agricultural University(No.KLDS201201)the Innovative Research Team of Higher Education of Heilongjiang Province(No.2010td11),China
文摘Traditional methods for detecting lactoperoxidase （LP） are complex and time-consuming, so a test strip was made based on the enzymatic reaction principle to enable quick and convenient detection of LP in raw milk. In this study 0.1 mol/L citric acid （CA）/0.2 mol/L disodium hydrogen phosphate （NAP） buffer solution （pH 5.0）, 22 mmol/L 3,3＇,5,5＇-tetramethylbenzidine （TMB）, 0.6 mmol/L hydrogen peroxide （H202）, and 0.5% Tween-20 or 0.3% cetyltri- methyl ammonium bromide （CTAB） were optimal for preparing a quick, sensitive, and accurate LP test strip. The coefficient of variation （CV） of the estimated LP concentrations ranged from 2.47% to 6.72% and the minimum LP concentration detected by the test strip was 1-2 mg/L. Estimates of active LP in sixteen raw milk samples obtained using the test strip or the TMB method showed a good correlation （c=0.9776）. So the test strip provides a quick, convenient, and accurate method for detecting the LP concentration of raw milk.
