Structure of Tetra[β-(1,2,4-triazole-1-yl)propiophenone] Dichloro Nickel(II) Solvate Hexahydrate Complex: [NiCl_2(C_2H_2N_3CH_2CH_2COPh)_4]·6H_2O

IntroductionRecently ,thecompoundscontaining 1H 1,2 ,4 tria zolegrouphaveattractedmuchinterestbecausetheyex hibitsomefungicidalactivity ,plantgrowthregulatingac tivity ,1antibacterialactivityagainstPucciniareconditeandrootsgrowthregulationforcucumber .2 Also ,suchcom poundsareincreasinglybeingstudiedbecauseofthecoor dinationchemistryoftriazolesactingasligandsintransi tionmetalcompounds .Asamatteroffact ,thetriazolederivativeshavebeenextensivelyusedasterminalandbridgingligands ,andtheyleadto…     

二(三苯基膦)水杨酸铜(Ⅰ)乙醇溶剂配合物的晶体结构

0IntroductionThestudyofcopper?complexesisinvestigatedinmanylaboratories.Amongthereasonsforcarryingouttheinvestigationofsuchspeciesaretheirstructuralfeatures犤1犦,theusefulnessofcopper?compoundsinorganicsyntheses犤2犦andthewell-documentedimpor-tanceofcopper?centersattheactivesitesofanumberofprotein犤3犦.Concerningcopper?carboxy-latesafurtherinterestexists,stemmingfromtheiruseinhomogeheouscatalysedhydrogenation犤4犦.Thecopper?bis(triphenylphosphine)cationisasoft,butflexi-bleacceptorionthatcanacc…     

甾醇资源的利用和皮质激素侧链的合成方法

本文讨论了开发甾醇资源作为甾体药物合成原料的前景,并综述了近几年由17-酮基甾体合成皮质激素侧链的各种方法。     

聚苯胺碳纤维针型复合微PH传感器

由电聚合法用聚苯胺修饰碳纤维电极作为ＰＨ敏感电极。 把Ｋ３Ｆｅ（ＣＮ）６／Ｋ４Ｆｅ（ＣＮ）６体系填入医用注射针头内成为参比电极。把经聚苯胺修饰的碳纤维电极安置入该针型参比电极内构成复合针型微ＰＨ传感器。该传感器成功地应用于在体ＰＨ测定以及水果内微区ＰＨ测定。     

在改性非水合成的丝光沸石上邻二甲苯异构化

1985年Bibby首次在非水体系中合成了纯硅方钠石,由此开创了一条合成分子筛的新途径。徐文旸等首次在Na_2O-SiO_2-Al_2O_3一有机胺非水体系中合成了丝光沸石(简称非水丝光沸石,用NAM表示)。晶化过程中液相无硅铝酸根离子,固相硅铝比始终保持不变,是典型的固相转化过程。利用非水体系这一特点,可以定向地合成出催化反应所需硅铝比的沸石。与水热体系相比,非水体系合成的丝光沸石在邻二甲苯异构化催化性能上要优于前者。     

[1-芳基甲羰基-2-(1,2,4-三唑-1-基)]乙基-N,N-二烷基二硫代氨基甲酸酯衍生物的合成、结构表征及生物活性研究

以芳香基三唑类杀菌剂三唑酮为先导物设计并合成了5个含N,N-二烷基二硫代氨基甲酸酯的芳香三唑类化合物, 通过元素分析、红外光谱、核磁共振氢谱和质谱对其结构进行了表征. 用X射线单晶衍射测定了[α-(4-甲氧基苯甲酰基)-2-(1,2,4-三唑-1-基)]乙基-N,N-二甲基二硫代氨基甲酸酯的晶体结构, 晶体属于三斜晶系, 空间群, 晶胞参数为: a＝0.73482(15) nm, b＝1.1051(2) nm, c＝1.1209(2) nm, α＝90.32(3)°, β＝101.97(3)°, γ＝105.13(3)°, V＝0.8578(3) nm³, Z＝2, D_c＝1.357 g/cm³, F(000)＝368, µ＝0.324 mm^－1. 生物测试结果显示这5种有机化合物都具有杀菌性和植物生长调节活性     

马来酸酐与二苄基马来酸酯共存体系的荧光分析法研究

本实验测定了二苄基马来酸酯甲醇溶液的荧光光谱，并发现马来酸酐对该荧光体系有猝灭作用，通过对不同马来酸酐浓度与各种浓度的二苄基马来酸酯甲醇溶液在４００ｎｍ处荧光强度数据的分析，发现马来酸酐的浓度与荧光猝灭程度在一定范围内呈良好的线型关系。据此，提出了用荧光猝灭法对马来酸酐及二苄基马来酸酯的定量分析     

南蛇藤倍半萜成分研究

从南蛇藤(Celastrus angulatus)的种子中分得三个新的倍半萜化合物(1～3)。它们的结构经紫外、红外、质谱及二维核磁谱确定为1β-乙酰氧基-8α-苯甲酰氧基-9β, 13-二(β-吡啶甲酰氧基)-β-二氢沉香呋喃(1)-1β, 2β-二羟基-6α-乙酰氧基-8β, 9β-二苯甲酰氧基-β-二氢沉香呋喃(2)和1β, 2β, 8β, 9β-四苯甲酰氧基-6α-乙酰氧基-β-二氢沉香呋喃(3)。     

基于均匀圆阵相干信源的二维DOA估计

随着通信技术的不断发展,信号传输环境变得日益复杂。针对多径传播形成的高度相关和相干信号测向问题,提出了一种基于均匀圆阵相干信源的二维DOA估计方法。该方法利用均匀圆阵轴向虚拟平移解相干,通过去噪后利用虚拟子阵的自协方差矩阵和互协方差矩阵构造波达方向矩阵,利用该矩阵特征分解估计信号的俯仰角;然后将平滑后的自协方差矩阵与波束空间变换矩阵相乘,使圆阵的导向矢量具备范德蒙结构,最后用求根MUSIC算法估计出信号的方位角,完成了相干信号的二维DOA估计。该方法无需二维谱峰搜索,方位角和俯仰角自动配对,计算量小,分辨率高。仿真实验证明了所提方法的正确性。     

CYTOPLASMIC EFFECT ON GENE FUNCTION IN Xenopus laevis

The pigmentation gene of Xenopus laevis is dominant and that of albino a~p mutant recessive. Hete-rologous haploid hybrids are produced by UV inactivation of the egg nuclei during second polar body for-mation in the mutant sperm-fertilized Xenopus eggs. During development of these hybrids, melanin ap-peared in the eye and melanophores in the skin at stages comparable to those of the wild type, but muchearlier than in the albino mutant. The number and intensity of pigment cells are interinediate betweenthe black Xenopus and albino mutant. While a number of pigment cells remain in the hybrids, thosein the albino eventually degenerate. Therefore, the development and maintenance of pigmentation in hete-rologous hybrids are contributed by Xenopus cytoplasm. Tadpole tail-tips were squashed and stained for chromosome counting. The results show thatXenopus and mutants are diploid (36 chromosomes) and heterologous haploid hybrids have 18 chromosomes.