Transient rheological behavior of lyotropic (acetyl)(ethyl)cellulose/m-cresol solutions

The chiroptical properties and transient rheological behavior of (acetyl)(ethyl)cellulose (AEC) m-cresol liquid crystalline solutions have been investigated. Chiroptical properties were manipulated through (i) increasing degree of acetylation of ethyl cellulose (EC), and (ii) blending AEC with EC. At the same average degree of acetylation (DA), the chiroptical properties of pure AEC were different from those of the EC/AEC mixtures. However, at the same DA, the AEC and mixed AEC/EC solutions showed similar steady state flow and oscillatory behaviors, but the transient behaviors were different. At high flow rates the mixed AEC/EC solutions exhibited double recoil after cessation of steady-state flow, whereas the AEC solutions showed double recoil only in the high DA AEC solutions. All solutions, pure and mixed, had the same stress relaxation behavior. Both pitch and handedness affected the transient behavior. After cessation of high shear rate flow, the rate of modulus evolution decreased with increasing pitch, and was faster in right-handed mesophases than in left-handed ones at a similar pitch.     

电解沉积压电频移分析的理论与验证

提出了控制电位电解和恒电流电解两类电解沉积的压电频移分析法测定的理论公式,用实验结果验证了它的正确性.     

[Cu(PTA)(Phen)2](p-MBA)(H6O)配合物的合成、晶体结构及电化学分析

The crystal structure of the title complex with the stoichiometric formula [Cu(PTA)(Phen)₂](p-MBA)(H₆O) (Phen=1,10-phenanthroline, PTA=terephthalic acid, p-MBA=p-toluic acid) has been determined by single-crystal X-ray diffraction. The crystal (C₄₈H₄₀CuN₄O₁₀, M_r=896.38) belongs to the monoclinic space group C2/c, with the following crystallographic parameters: a=1.778 6(3) nm, b=1.912 5(3) nm, c=1.389 9(2) nm, β=114.686(2)°, V=4.295 7(12) nm³, D_c=1.386 g·cm^-3, Z=4, μ(Mo Kα)=0.574 mm^-1, F(000)=1 860, final GooF=1.019, R=0.054 0, wR=0.148 3 for 2 644 observed reflections (I>2σ(I)). The crystal structure shows that the copper(Ⅱ) ion is coordinated with two oxygen atoms from one terephthalic acid molecule and four nitrogen atoms from two 1,10-phenanthroline molecules, forming a distorted octahedral coordination geometry. The cyclic voltametric behavior of the complex is also reported. CCDC: 298809.     

[M(en)3] (ndt)•H2O的水热合成、晶体结构和光学性能 ( M=NiⅡ, CoⅡ, MnⅡ and ndt=1,5-naphthalenedithiolate )

水热条件下，合成了三个新的配合物[Ni(en)₃] (ndt) ·H₂O 1, [Co(en)₃] (ndt) ·H₂O 2 和[Mn(en)₃] (ndt) ·H₂O 3。晶体结构通过X-射线单晶衍射进行了表征。三个配合物均属于单斜晶系，Cc空间群。[M(en)₃]²⁺阳离子、ndt阴离子和结晶水分子通过氢键自组装出相同结构的三维网。通过紫外-可见-近红外漫反射光谱对这三个配合物的光吸收性能和能带进行了测定。     

Synthesis and Crystal Structure of the Copper Complex of 7，16-Bis（2-hyd roxy-5-met hylbenzyl）-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane

A lariat crown ether ligand 7,16-bis (2-hydroxy-5-methylbenzyl)- 1,4,10,13-tetraoxa-7,16-diazacyclooctadeeane (L1) has been prepared via one-pot Mannich reaction. Its copper(Ⅱ) complex Cu-L1 was synthesized and characterized by elemental analysis, IR and UV-visible spectroscopy. The crystal structure of the complex has been determined by X-ray diffraction analysis. The result shows that the copper(Ⅱ) ion is six-coordinated by two nitrogen and four oxygen atoms, two from the crown ether and the other two from the deprotonated phenolate anions, forming an elongated octahedral complex. Electrochemical study indicates that the complex undergoes reversible reduction in DMF solution.     

3-(四氯化锡)-丙酸甲酯阴离子的合成及晶体结构

在用酯基锡MeO2CCH2CH2SnCl3合成配合物MeO2CCH2CH2SnCl3·(2-OHC6H4CH=NC6H5)时,其配合物的甲苯溶液放置培养单晶时(放置十天以上)会发生分解生成配合物MeO2CCH2CH2SnCl4—·H+。研究了标题化合物的合成反应,用元素分析、IR、NMR对配合物进行了表征,并测定了晶体结构。为正交晶系,空间群为P2cn, a=7.852(2), b=12.236(1), c=16.952(4) ? V=1628.7?, Z=4, Dc=1.79g/cm3, F(000)= 860,m=22.2cm—1(Mo),R=0.0449, Rw=0.0382。标题化合物的空间构型为畸变的八面体构型,中心锡原子的配位数为6。     

以结晶紫与亚硝基R盐吸光光度法测定镍

在氨性（ＰＨ９－９．５）条件下，镍（Ⅱ）与结晶紫及亚硝基Ｒ盐反应形成紫色络合物，表观摩尔吸光系数ε５３６＝２．２９×１０＾５Ｌ，ｍｏｌ＾－１，镍浓度在０．０１２０ｍｇ／Ｌ范围内遵守比耳定律，组成摩尔比为Ｎｉ：ＣＶ：Ｒ＝１：２：１，本法快速，为光度测定微量镍的高灵敏方法之一，用于土壤、人发等试样中镍的测定、结果满意。     

四(三苯基氧膦)高氯酸钕合乙醇配合物的合成及结构测定

合成了Nd(ClO_4)_3·4phP=O·C_2H_5OH配合物,用四园衍射仪测定了它的分子及晶体结构,此晶体属三斜晶系P1空间群,晶胞参数为:a=13.475(61)A;b=15.003(15)A;c=18.697(15)A;α=85.44(7);β=78.49(24)°;γ=83.13(26)°;V=3671.2A,分子由99个非氢原子组成,实际上分子可分为三个部分即:配阳离子[Nd(ClO_4)_2·4phPO]~+;阴离子ClO_4和溶剂合分子C_2H_5OH配阳离子的钕与八个氧配位,四个氧来自双齿配位的ClO_4,四个氧来自四个ph_3PO,八个配位氧组成三角十二面体。 中性膦(磷)类化合物包括(RO)_3P=O和R_3P=O是一类重要的萃取剂。工业上已应用的TBP和TOPO都属于这一类。为了研究这类萃取剂在不同底液中萃取行为之所以不同的内在因素,我们制备了不同希土盐类与三苯基氧膦的配合物,并对它们进行了结构测定。已知的中性氧膦希土配合物中进行过结构测定的有Ce(NO)·2phP=O、Nd(NO)_2·2php=O·C_2HOH、La(NO_3)_3·3php=O·C_2H_5OH·CHCl_3和Nd(NCS)·4php=O。这些配合物晶体及分子结构各异,这表明了三苯基氧膦在形成配合物时的复杂性。本文报导的Nd(ClO_4)·4phP=O·C_2H_5OH实际上是由三部分组成;即[Nd(ClO_4)_2·4phP=O]~+外界的ClO_4和溶剂合分子。这在中性配体与高氯酸希土形成的配合物中时有发现。已知结构的     

Novel Isatin-Schiff Base Cu (II) and Ni(II) Complexes. X-ray Crystal Structure of Bis[3-(4-hexylphenylimino)-1H-indol-2(3H)-one]-dichlorocopper(II) Complex

Schiff bases of isatin were reported to possess antibacterial, antifungal, antiviral, anti-HIV, antiprotozoal, and anthelmintic activities1. They also exhibit significantanticonvulsant activity, apart from other pharmacological properties2. Conductingsubs…     

New silver(i) thiazole-based coordination polymers: structural and photophysical investigation

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