某些酸性磷膦酸酯VO(Ⅱ)络合物在氯仿中ESR研究

本文对某些酸性磷(膦)酸酯VO(Ⅱ)络合物在氯仿中室温ESR谱做了进一步的解析,并测得这类络合物在氯仿中在液氮温度下ESR波谱参数,计算了它们的键参数,对这类络合物的成键特性进行了讨论。     

碱性橙Ⅱ印迹传感器的制备及其应用

以纳米石墨烯和纳米银作为修饰材料修饰工作电极,制备一种以碱性橙Ⅱ为模板分子,邻氨基苯酚和邻苯二胺为复合功能单体的新型快速检测碱性橙Ⅱ的印迹传感器。运用紫外光谱法选择最佳功能单体,并研究了模板分子与功能单体之间的作用形式和作用强度,采用电化学分析法优化各种制备条件,用甲醇?0.4 mol/L NaOH水溶液（体积比2∶1）洗脱模板分子,得到分子印迹电极,并对印迹电极的分析性能进行了研究。实验结果表明,该印迹传感器对碱性橙Ⅱ具有高选择性,样品加标平均回收率为88.45%～101.40%,相对标准偏差（RSD）在1.31%～2.83%之间（n=5）,线性范围为3.0×10^-9～5.0×10^-5 mol/L,检出限为1.0×10^-9 mol/L。该传感器成功应用于食品中碱性橙Ⅱ残留的快速检测。     

新型侧链液晶聚醚螯合树脂的合成及其对水中Cu2 +的吸附性能研究

以环氧环己烷作为改性单体,通过环氧氯丙烷与环氧环己烷阳离子开环聚合获得分子量约为3000的共聚醚主链。然后以联苯为介晶基元、亚氨基二乙酸为末端螯合基团,成功合成了一种新型结构的侧链液晶聚醚螯合树脂。在对其结构鉴定以及基础物理性质测定的基础上,系统地研究了该树脂对水中Cu²⁺吸附的影响因素、再生性能、吸附选择性、吸附模型以及吸附动力学。结果表明,该树脂对Cu²⁺具有良好的吸附性能、再生性能和选择性,其对水中Cu²⁺的吸附为Langmuir单分子层吸附,吸附过程符合准二级动力学模型。     

Points of Coincidence and Common Fixed Points for Ⅱ-Expansive Mappings on Complex Valued Metric Spaces

We use the two mappings satisfying Ⅱ-expansive conditions on complex valued metric spaces to construct the convergent sequences and prove that the unique limit of the sequences is the point of coincidence or common fixed point of the two mappings.Also,we discuss the uniqueness of points of coincidence or common fixed points and give the existence theorems of unique fixed points.The obtained results generalize and improve the corresponding conclusions in references.     

苝二酰亚胺衍生物/三联吡啶铂配合物超分子在G-四链体检测中的应用

合成了3种三联吡啶铂(Ⅱ)配合物(Pt1、Pt2、Pt3)和两种苝二酰亚胺衍生物(PDI1、PDI2),构建了三联吡啶铂配合物/苝二酰亚胺衍生物超分子体系。所得超分子体系可作为"turn-on"型荧光传感器用于检测c-myc G-四链体。三联吡啶铂配合物可通过电子转移作用猝灭苝二酰亚胺的荧光,利用最小二乘法求得三联吡啶铂配合物与PDIs的结合常数为5.57×104~5.28×106 L/mol。加入G-四链体后,三联吡啶铂配合物/苝二酰亚胺超分子发生解离,苝二酰亚胺衍生物的荧光得到恢复。在Pt2/PDI2体系中加入1.5μmol/L c-myc G-四链体可使其荧光增强63倍。在c-myc的浓度为25nmol/L~1.0μmol/L范围内,Pt2/PDI2超分子体系荧光增强(F/F0)与c-myc的浓度呈良好的线性关系(R2=0.995),检测限为1.37nmol/L,表明Pt2/PDI2超分子体系可用于检测c-myc序列DNA。     

Protecting pressure gauges with grease in high temperature facilities

The thermal protection of pressure gauges used in shock tubes has to avoid inducing losses in response time and accuracy. A study was undertaken to this purpose, and a procedure for mounting and covering the gauges with a protection layer of grease has been developed. Results up to date show satisfactory behaviour.This article was processed using Springer-Verlag T_EX Shock Waves macro package 1.0 and the AMS fonts, developed by the American Mathematical Society.     

含吡啶-2，6-二羧酸的钴(Ⅱ)配合物的合成、表征、抗肿瘤活性和理论计算

以吡啶-2,6-二羧酸作为配体,在水热条件下合成了一种新的钴配合物:[Co(Hpdc)(bpy)Cl]·C2H5OH(H2pdc=吡啶-2,6-二羧酸,bpy=2,2′-联吡啶),并对其进行了红外和X射线单晶衍射表征。为了深入揭示该配合物的电子结构,采用密度泛函理论来研究其电荷分布、静电势、前沿分子轨道以及在溶液条件下的相关电子性能。我们采用溴化噻唑蓝四氮唑(MTT)法测试了该配合物对慢性粒细胞白血病(K562)和食管癌(OE-19)细胞的抗肿瘤活性,其IC50值仅为(0.22±0.05)μg·mL^-1和(0.82±0.16)μg·mL^-1(即(0.48±0.11)μmol·L^-1和(1.77±0.35)μmol·L^-1),表明该化合物对这2种癌细胞系具有较强的细胞毒性。     

An unexpected iron(Ⅱ)-promoted reaction of N-arylprop-2-yn-1-imines with water:Facile assembly of multi-substituted pyrroles

Generation of multi-substituted pyrroles is accomplished through an unexpected iron(Ⅱ)-promoted reaction of N-arylprop-2-yn-1-imines with wate r.This transformation proceeds smoothly with excellent chemoselectivityand regioselectivity.A stoichiometric amount of Fe(OTf)₂ is necessary for the succes s ful conversion.A Lewis acid-promoted tandem reaction pathway is proposed.     

Fe3O4/HA复合吸附剂对Ni(Ⅱ)的吸附性能研究

采用碱溶酸析法提取腐植酸(HA),通过CaCl₂对其改性后与Fe₃O₄进行复合,制备出不同配比的Fe₃O₄/HA复合吸附剂。利用SEM、BET、FT-IR、XRD分析方法对HA、钙改性HA、Fe₃O₄/HA复合吸附剂进行了表征,考察了物料配比及吸附时间、pH值、温度、投加量和初始浓度对Ni(Ⅱ)吸附率的影响。结果表明:质量复合比mHA:mFe₃O₄:mCaCl₂为3∶2∶2的Fe₃O₄/HA复合吸附剂(HA2)对Ni(Ⅱ)吸附效果最佳。当加入0.8 g吸附剂,Ni(Ⅱ)初始浓度为0.1 g·L^-1,吸附5 h,pH=5,温度40℃,吸附剂对Ni(Ⅱ)的吸附率为92.57%。复合吸附剂在4次吸附脱附后,对Ni(Ⅱ)的吸附率仍达到52%。吸附过程符合准二级动力学方程和Freundlich吸附等温式。在20℃~40℃条件下,热力学参数ΔG<0、ΔS=37.57 J/(mol·K)、ΔH=11.07 kJ·mol^-1,表明该吸附是自发、熵增、吸热的过程。     

Three New Zn(Ⅱ) Coordination Compounds Based on the in-situ Formed Tetrazolate Ligand: Syntheses,Crystal Structures and Luminescence Properties

Reactions of 2-(2-benzoimidazolyl)acetonitrile and Na N3 with Zn SO4 or Zn Cl2 in the presence of nicotinic acid in the mixture of Et OH/H2 O afforded a mononuclear compound [Zn(L1)2](1) and a 1-D polymer [Zn(L1)Cl]n(2), respectively(L1 = 5-[(benzoimidazolyl)methyl]-1H-tetrazolate). However, in the similar condition except that imidazole was added instead of nicotinic acid, the reaction afforded a 1-D compound [Zn(L1)2]n(3) featuring triply helical chains via the π-π stacking of ligands. They are characterized by elemental analysis and IR, and their structures have been determined by X-ray crystallography. Thermal stability of these compounds was measured by TGA and their luminescent properties were investigated at room temperature.