Syntheses,Structures, and Properties of Two Cd(II)/Zn(II) Complexes with 1,2,4-triazole Derivatives

Russian Journal of Coordination Chemistry - Two new coordination polymers, {[Cd(Hmph)(Itmb)] ? H2O}n (I) and [Zn(Hmph)(Bpt)2]n (II) (H2Hmph = homophthalic acid, Itmb =...     

三维Cu-MOF对亚甲蓝的吸附和光催化降解及其机理

本文报道了[Cu₃(ppda)₃(tib)₂(H₂O)₄]·6H₂O(Cu-MOF)的合成、结构、吸附和光催化降解性能。在Cu-MOF中,1,4-苯二乙酸(H₂ppda)和1,3,5-三(1-咪唑基)苯(tib)配体交替连接Cu离子形成二维层,层与层之间通过trans-ppda^2-相互穿插形成稳定的三维结构。Cu-MOF对亚甲蓝(MB)的催化效率为97%,最高反应速率常数为0.019 7 min^-1。光催化降解机理：在光的激发下,催化剂表面的光生电子和空穴对发生分离,并与O₂、H₂O、H₂O₂反应生成活性物质,将染料降解为CO₂和H₂O。在MB溶液中加入NaCl(200 g·L^-1)后,Cu-MOF的吸附量有所提升(87.23 mg·g     

基于柔性四羧酸配体构筑的两个镉(Ⅱ)配位聚合物的晶体结构及荧光性质

通过溶剂热和水热合成的方法制备了2个Cd（Ⅱ）配位聚合物[Cd₂（L）（DMF）_1.5（H₂O）₂]_n（1）和{[Cd（L）_0.5（4,4''-bpy）（H₂O）]·2H₂O}_n（2）（H₄L=5,5''-（己烷-1,6）-双-（氧基）-二-间苯二甲酸）。结构分析表明配合物1是一个（4,4）-连接的sql拓扑网络,拓扑符号为{4⁴·6²}₂。配合物2是一个（4,4,4）-连接的三重穿插的bbf网络,拓扑符号为（6⁶）（6⁴·8²）。配合物1和2都呈现出较好的热稳定性和荧光性质。     

Photoluminescence enhancement of InP treated with activated hydrogen

A large enhancement of the photoluminescence intensity emitted by a (100)-oriented InP surface after exposure to activated hydrogen, indicating a sharp reduction of the surface recombination rate is reported in this work. It is shown, using capacitance-voltage measurements performed on metal-insulator-semiconductor structures, that the hydrogen treatment results also in a strong pinning of the interface Fermi level. These phenomena are interpreted on the following basis: (i) neutralization by hydrogen species of active recombination centers which are deemed to be phosphorus dangling bonds; (ii) creation of pinning surface states due to the formation of volatile phosphorus hydride compounds freeing excess indium atoms.     

Establishment of a new molecular model for mercury determination verified by single crystal X-ray diffraction,spectroscopic analysis and biological potentials

A wide variety of molecular probes have been developed for real-time analysis,but most of organic fluorophores possess small Stokes shifts and self-absorption or inner filter effect that could not be avoided.In this study,a new dicyanoisophorone-based derivative(E)-0-(4-(2-(3-(dicyanomethylene)-5,5-dimethylcyclohex-1-en-1-yl)vinyl)phenyl)diphenylphosphinothioate(λ_ex=405 nm,X_em=551 nm,denoted as ICM-S) with strong push-pull electron effect has been afforded and it exhibits red shift for absorption from 407 nm to 426 nm with distinct color change from pale yellow to deep yellow upon exposure to Hg~(2+).Moreover,an easily distinguishable fluorescence color change follows the route from green,yellow to red in the presence of Hg~(2+) over the range of 0-90 μmol/L(detection limit=137 nmol/L)can be observed by the naked eye under a UV lamp irradiation.Chlorodiphenylphosphine and sublimedsulfur are incorpo rated as re s ponsive sites and P-O bond has been cleaved upon the addition of mercu ry ions.During the recognition process,such dicyanoisophorone dye(ICM-S) has been evolved to 2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene) malononitrile(ICM-OH).Clear evidences in the chemical processes can be identified via single crystal X-ray diffraction,spectroscopic analysis,photophysical studies and titration experiments.With the aim of exploring its potential in biological systems,its in vitro responses to Hg~(2+) have been evaluated in 293 T cells and the effectiveness in zebrafish model has also been verified.     

Crystal structures and magnetic properties of two isomorphic nickel(II) and cobalt(II) coordination polymers-based nitrogen-heterocyclic tricarbolylate ligands

5-(3,4-Dicarboxylphenyl) picolinic acid (H₃dppa) was applied as a new building block for the synthesis of two isomorphic coordination polymers, namely [Ni_1.5dppa(H₂O)₃]_n·nH₂O (1), [Co_1.5dppa(H₂O)₃]_n·nH₂O (2). Two compounds were generated by a hydrothermal self-assembly method using the corresponding metal(II) acetates and H₃cppa ligand. Structure analysis reveals that compounds 1 and 2 are isomorphic both featuring a two-dimensional wave structure and are finally extended into the three-dimensional supramolecular architecture though hydrogen bonding interactions. Magnetic susceptibility measurements indicate that domain a weak ferromagnetic exchange coupling between the adjacent Ni(II) centers in 1, and a weak antiferromagnetic coupling between Co(II) ions in for 2.

     

On the Chebotarëv theorem over finite fields

Let p be a prime number and let $V_p$ be the Vandermonde matrix with $(i,j)$-entry equal to ${\omega }^{ij}$ for $0\le i,j\le p-1$, where ω is a primitive pth root of unity in the complex field. The classical Chebotarëv theorem says that all square submatrices of $V_p$ have nonzero determinant. In this paper, we establish the Chebotarëv theorem over finite fields by imposing certain conditions.     

Quantum Speed Limit Time of a Two-Level Atom under Homodyne-Mediated Feedback and Classical Driving

International Journal of Theoretical Physics - We study the QSLT of the two-level system coupling to a single mode cavity which is driven by a laser field under the feedback control, and focus on...