CRYSTAL AND MOLECULAR STRUCTURE OF N—ETHYLPHENOTHIAZINE RADICAL CATION HEXACHLOROANTIMONATE EPT^＋SbCl6^—

<正> C14H13Cl6NSSb, Mr =561.8, Monoclinic, C2/c1 8=15,32(1), b= 11.72(1), c= 11.10(1)A,β=99.31(3)°,V=1969(1)A3,Dc=1,902g.cm-3, Z=4,CuKα,λ=1.5418A,μ=200.95cm-1.Room temperature, final R=0.051 for 1197 unique reflections with I>, 3.0σ(I).Pronounced defornation of the Molecular structure has been observed when the neutral N-ethylphenothia-zine is transformed into its radical cation. The structural features of the radical cation are compared with those of N-methyl analogue.     

Controlled/“Living “Radical Polymerization of(-)-Menthyl Methacrylate

The atom transfer radical polymerization(ARP)of (-)-menthyl methacrylatc((-)-MnMA) mediated by CuCl/bipyridine and ethy1 2-bromopropionate or 1-phenylethyl bromide in THF system has been studied.The dependence of the specific rotation on molecular weight and the CD of Poly((-)-MnMA) thus obatined was investigated.     

STUDY ON SYNTHESIS OF SELF CORSS LINKED POLYSTYRENE LATEX MICROSPHERES

Emulsifier-free emulsion polymerization of styrene in the presence of β-hydroxy propyl acrylate was studied.The emulsifier-free self cross linked polystyrene latex microspheres was obtained.Monomer conversion is higher than 90% when [St],[β-HPA],[KPS] is 2.66,0.228,and 5.8&#215;10^-3mol/L respectively under 80℃ for 5h.The mono-dispersed latex particle diameter and colloidal particle concentration were given as D=0.23um,N=3.13&#215;10^13/cm^3 by TEM analyse,The factors of influencing latex stability were discussed.Thecopolymer was characterized by IR and dissolution experiment.The apparent activation energy of polymerization and polymerization rate constant were obtained to be 78.7KJ/mol and 514.4/mol.s respectively.     

Ab initio Valence Bond Study on AB-type Molecules,A Description for XH(X=L,Be,B,C,N,O,F) and XF(X=Li,Be,B)

Ab initio valence bond method is employed to quantitatively study the concepts of ionic resonance energy and ionicity of a chemical bond in the cases of hydrides XH(X=Li,Be,B,C,N,O,F) and fluorides XF(X=Li,Be,B),By establishing the relationship between resonance and stability,and comparing the calculated ionicities with Pauling‘s earlier estimations in the above diatomic molecules,the merits of Pauling‘s classical resonance theory were demonstrated at the ab initio level.     

SYNTHESIS AND STRUCTURE OF A NEW TYPE OF COORDINATION COMPOUND OF Tb（Ⅲ）WITH BENZOIC ACID

<正> The synthesis and crystal structure of a novel rare earth coordination compound are reported. [TbL3(HL)H2O]2 (HL=henzoic acid) Mr=1324. 81, triclinic, space group P1, a=9. 148(1), b=11. 4 60(2), c=13. 506(2) A ;a=112. 76(1), B=91.83(1),y=91. 99(1) ;Z=1 ;V=1303. 3(4)A3;Dc=1.69g.cm-3;F(000)= 656;u=28. 4cm-1(MoKa). The final R is 0. 024. Each rare-earth ion in the title complex is nine-coordinated by seven oxygen atoms from five benzoate groups, one benzoic acid, and one aqua molecule, forming a distorted monocapped square antiprism.     

Two New Isobutyltartrate Monoester from Coeloglossum viride （L.） Hartm.var.bracteatum（Willd.） Richter

Two new isobutyltartrate monoesters,coelovirin A (1) and B(2),were isolated from the rhizomes of Coeloglossum viride (L.) Hartm. var. bracteatum (Willd.) Richter (Orchidaceae). Their structures were elucidated as (2R,3S)-2-isobutyltartrate-1-(4-β-D-glucopyranosyloxybenzyl) ester 1 and (2R,3S)-2-isobutyltartrate-4-(4-β-D-glucopranosyloxybenzyl) ester 2 on the basis of physical constants and spectroscopic methods including 2D NMR techniques.     

Y2O2S：Eu,Mg,Ti,Tb红色长时发光材料的研究

利用高温固相反应法合成了一种新型的红色长时发光材料－Y2O2S：Eu,Mg,Ti,Tb.材料的XRD测试结果表明Eu掺杂引起Y2O2S，Eu,Mg,Ti,Tb晶胞增大，激发光谱，发射光谱和发光衰减曲线表明该材料是一种适合紫外线和可见光激发，并具有很好的长时发光性能的红色长时发光材料，热释光谱测试结果表明该材料可能具有两个较深的陷阱能级，研究了Eu,Mg,Ti,Tb的加入量对材料发光特性的影响。结果表明：Eu,Mg,Ti,Tb影响材料的初始亮度和发光时间，Eu决定材料的红色比。