Schiff碱铜(Ⅰ)配合物的合成、结构及其与DNA相互作用的研究

A Cu(Ⅰ) complex [Cu(INHPy)(PPh₃)₂] ·(ClO₄)·0.75(C₂H₅OH) was obtained through self-assembly between [Cu(PPh₃)₂(MeCN)₂]ClO₄ and Schiff base 2-pyridylcarboxaldehyde isonicotinoyl hadrazone(INHPy), the structure of which was characterized by elemental analysis, IR spectrum and X-ray diffraction. Single crystal X-ray analysis indicates that this compound crystallizes in triclinic system, space group P1 with parameters: a=1.180 7(2) nm, b=1.330 0(3) nm, c=1.568 6(2) nm. α=100.91(1)°, β=108.863(2)°, γ=95.51(2)°. V=2.382 0(7) nm³, Z=4 , D_c=1.332 g·cm^-3, F(000)=1 032, μ=0.634 mm^-1. At the same time, we studied the title complex interacting with DNA with resonance light-scattering spectrum. The results showed that intensities of RLS signal are direct proportion to the concentration of DNA, (ΔI=0.804+23.770C, r=0.995). CCDC: 231388.     

Robust fuzzy control for chaotic dynamics in Lorenz systems with uncertainties

This paper deals with the robust fuzzy control for chaotic systems in the presence of parametric uncertainties. An uncertain Takagi--Sugeno fuzzy model for a Lorenz chaotic system is first constructed. Then a robust fuzzy state feedback control scheme ensures the control for stable operations under bounded parametric uncertainties. For a chaotic system with known uncertainty bounds, a robust fuzzy regulator is designed by choosing the control parameters satisfying the linear matrix inequality. To verify the validity and effectiveness of the proposed controller design method, an analysis technique is suggested and applied to the control of an uncertain Lorenz chaotic system.     

N-1,3,4-噻二唑-2-基取代Schiff碱的合成及光学性质研究

本文以对甲苯磺酸为催化剂,通过2-氨基-5-烃基-1,3,4-噻二唑与水杨醛的反应合成了一系列N-1,3,4-噻二唑-2-基取代Schiff碱类化合物2,利用IR,1H NMR,13C NMR和元素分析表征了化合物的结构。采用紫外光谱和荧光光谱研究了化合物的光谱性能,结果表明,所合成的化合物2具有较强的荧光发射光谱,λem为554～573 nm。     

Beam Propagation Factor and Generation of Cosh-squared-Gaussian Beams

A new light beam termed as a cosh-squared-Gaussian beam (ChSGB) which may be one of solutions of the paraxial wave equation for propagation in complex optical systems has been introduced. Their beam propagation factor (M2-factor) is derived and schemes to generate this light beams are proposed.     

Arsenic as internal standard to correct for interferences in the determination of antimony by hydride generation in situ trapping graphite furnace atomic absorption spectrometry

The feasibility of using internal standardization (IS) to correct for interferences in hydride generation with in situ trapping in graphite furnace was evaluated. Arsenic was chosen as internal standard for Sb determination and Ir was used as permanent modifier. Fluctuations in the main parameters that affect the analytical results were minimized by IS and an effective contribution was verified in the studies of liquid phase interferences. Cobalt and Ni²⁺ were selected to illustrate the potential use of IS on the correction of interference by transition metals. The application of IS allows the Sb determination in samples containing up to 20-fold higher concentration of the Co²⁺ and Ni²⁺ when compared to the procedure without IS. The relative standard deviation of measurements varied from 0.3% to 0.7% and from 1.1% to 3.2% with and without IS, respectively. Recoveries within 92% and 107% of spiked aqueous solution containing Sb(III) and Sb(V) were found.     

Topological steric effect index and its application

This paper proposed a Topological Steric Effect Index (TSEI) of a group based on the relative specific volume of the reaction center screened by the atoms of the substituents. Investigated results show good correlations between the parameter TSEI and the dihedral angles between both phenyl rings determined by photoelectron spectroscopy for 7 alkylbiphenyl compounds and calculated by a molecular mechanics force field for 78 alkylbiphenyl compounds, whose correlation coefficients are 0.9912 and 0.9845, respectively. The TSEI value of the group is easily calculated and has a clear physical meaning. In addition, it is correlated well to dihedral angles of the 1,2-disubstituted benzene compounds, stereoselectivity of organomagnesium compounds addition to some cyclohexanones and cyclopentanones, and the relative rates of some SN2 reactions.     

Photophysics and photochemistry of the 2,4,6-triphenyl-2-benzyl-2H-thiopyran versus 2H-pyran derivatives

The photochemistry and photophysics of one thiopyran (2,4,6-triphenyl-2-benzyl-2H-thiopyran) and two pyran (2,4,6-triphenyl-2H-pyran and 2,4-dimethyl-2,6-diphenyl-2H-pyran) derivatives were investigated by stationary and time resolved techniques. Both theory and experiments indicated a π,π^* character for the lowest singlet states of these molecules, located in the UV region approximately at the same energy. Upon stationary UV irradiation at low temperature, colourless photoproducts were formed from the pyran derivatives, while coloured compound(s) were obtained from the thiopyran. Long-lived transients were observed at room temperature, which were assigned to the photoproducts obtained at low temperature; only in one case (2,4,6-triphenyl-2H-pyran) a triplet precursor was detected.     

原子电负性和极化度对卤代甲烷C 1s电子电离能的影响

以原子的电负性χP和极化度α为基本参数, 估算卤代甲烷CHnY4−n−mZm(Y, Z=F, Cl, Br, I) C 1s电子电离能的电荷效应和松弛效应. 电荷效应由C—H和C—Y(Z)键两端原子的电负性差来度量, 松弛效应由碳原子带的电荷乘上氢和卤素原子极化度来衡量, 进而用电荷效应和松弛效应一起表达卤代甲烷中C 1s电子电离能的静电-松弛屏蔽效应ΔSi. 将ΔSi代入类-Slater模型, 得到卤代甲烷中C 1s电子电离能E1,C的估算方程, 该方程的相关系数r=0.99987, 对27个卤代甲烷的计算值与实验值之间的平均绝对误差仅为0.038 eV, 小于实验误差0.1 eV. 同时, 用留一法(leave-one-out)进行交叉验证(相关系数rcv=0.99977, 预测值与实验值之间的绝对平均误差只有0.049 eV), 结果表明所得方程具有良好的预测能力和稳定性.     

On asymptotically efficient estimation for a semiparametric regression model

1.IntroductionConsiderthemodelY=X"0 g(T) E,(1'1)whereX"~(xl,',xo)areexplanatoryvariablesthatenterlinearly,Pisakx1vectorofunknownparameters,Tisanotherexplanatoryvariablesthatentersinanonlinearfashion,g')isanunknownsmoothfunctionofTinR',(X,T)andeareindependent,andeistheerrorwithmean0andvariancea2.Trangesoveranondegeneratecompact1-dimensionalilltervalC*;withoutlossofgenerality,C*=[0,1].Chenl2]discussedasymptoticnormalityofestimatorsP.of0byusingpiecewisepolynthacaltoapproximateg.Speckmanls…     

Clean preparation of S-thiocarbamates with in situ generated hydroxide in 2-methyltetrahydrofuran

A simple and clean protocol for the synthesis of various alkyl and (hetero)aryl S-thiocarbamates was established. The usage of in situ generated hydroxide as both an oxygen source and hydrogen source as well as biomass-derived 2-methyltetrahydrofuran as a green reaction medium, the avoidance of phosphorus-containing reductant, and the generation of harmless water and nitrogen as the side-products have given the present method atom-economy and environmental friendliness.