Surfactant-free Ionic Liquid Microemulsions of N,N-dimethylformamide, 1-butyl-3-methylimidazolium hexafluorophosphate,and toluene

The phase diagram of a ternary system consisting of the hydrophobic ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF₆), N, N-dimethylformamide (DMF), and toluene was prepared at 25°C. A single-phase microemulsion and a multiphase region were demonstrated. The systems were nonaqueous IL microemulsions in the absence of traditional surfactants. The single-phase region could be divided into toluene-in-bmimPF₆, bicontinuous, and bmimPF₆-in-toluene subregions by electrical conductivity, similar to the case of surfactant-based IL microemulsions. And by the use of methyl orange as an absorption probe, the polarity of the bmimPF₆-in-toluene microemulsion was probed by UV–vis spectroscopy. The polarity of bmimPF₆ domains increased with increasing bmimPF₆ constant, and a relatively constant polarity was obtained when bmimPF₆ was increased to a certain extent.     

基于二乙醇胺配体的[Dy2Co8]型配合物的合成、晶体结构和磁性分析

以二乙醇胺为配体合成了一种具有[Dy₂Co₈]核结构的配合物[Dy₂Co₈（L）₄（HL）₄（HCOO）₄（OH）₂Cl₂（CH₃OH）₂]Cl₂·4CH₃OH·2H₂O（1）（H₂L=二乙醇胺）,并对其进行了X射线单晶衍射、红外光谱、元素分析和磁性表征。该配合物属于三斜晶系,P1空间群。晶体学数据：a=1.160 4（8）nm,b=1.322 7（9）nm,c=1.465 3（9）nm,α=71.181（7）°,β=67.638（7）°,γ=65.939（7）°。在晶体结构中,每一个Dy（Ⅲ）都是九配位,而每一个Co（Ⅱ）均为六配位。     

Four complexes with a bulky carboxylate ligand: syntheses,crystal structures,and luminescent properties

Abstract  

Four complexes of 3,3-diphenylpropanoate (L) and 4,4′-bipyridine as auxiliary bridging ligands were synthesized and characterized, namely [Zn(L)₂(4bpy)(EtOH)₂]_∞ (1), [Co(L)₂(4bpy)(EtOH)₂]_∞ (2), [Ni(L)₂(4bpy)(EtOH)₂]_∞ (3), and [Cu(L)₂(4bpy)(H₂O)]_∞ (4) (4bpy = 4,4′-bipyridine). X-ray single-crystal diffraction analyses show that complexes 1–4 all take one-dimensional (1D) fishbone-like structures incorporating bridging 4bpy ligands. The complexes show different supramolecular frameworks interlinked via intermolecular hydrogen bonds, π···π stacking, and/or C–H···π supramolecular interactions. Complex 3 only has a simple one-dimensional fishbone-like chain, whereas complexes 1 and 2 show two-dimensional supramolecular structures by interchain C–H···O hydrogen bonds. Complex 4 is assembled into two-dimensional layers and then an overall three-dimensional framework by a combination of interchain O–H···O hydrogen bonds and C–H···π supramolecular interactions. The luminescent properties of the ligands and their complexes were investigated.     

锌铋复杂氧化物Bi2Zn5O8的合成及其晶体生长特性

利用硫酸锌、硝酸铋、氢氧化钠为原料在超声体系中反应合成锌铋复杂氧化物,考察了反应物料比和加料顺序对产物组成的影响.经X射线荧光及化学滴定确定了产物的分子式为Bi2Zn5O8,并由TEM、SEM和TG-DTA等方法对所得产物进行表征.TEM和SEM结果显示晶体呈枝蔓晶生长.     

Two Manganese(II) Complexes with a Bulky Fluorene‐Based Carboxylate Ligand: Syntheses,Crystal Structures,and Luminescent Properties

To explore the coordination possibilities of fluorene‐based ligands, two manganese(II) complexes with the ligand 9,9‐dibutyl‐9H‐fluorene‐2,7‐carboxylate ( L ) were synthesized and characterized: [Mn₂( L )₂(DMF)₃]_∞ ( 1 ) and [Mn₂( L )₂(DMF)]_∞ ( 2 ). X‐ray single‐crystal diffraction analyses show that complex 1 has a two‐dimensional (2D) (4,4) structure, whereas complex 2 consits of a three‐dimensional (3D) (4,5)‐connected topology framework. The results indicate that the steric bulk of the fluorene ring in H₂ L plays an important role in the formations of 1 and 2 . Additional pyridine‐based ligands govern the formation of the final frameworks of 2 . Moreover, the luminescent properties of these complexes were briefly investigated.     

Synthesis and Crystal Structure of a New [Mn_2Ni_2] Cubane Complex

A new Mn2Ni2 cubane complex has been synthesized and characterized by single-crystal X-ray diffraction,FT IR spectra and elemental analysis.The title compound [MnIII2NiII2(hmp)4(N3)4(O2CR)2](hmp-is the anion of 2-pyridinemethanol and O2CR-is α-na-phthaleneacetate)crystallizes in the monoclinic system,space group P21/c with a = 10.519(5),b = 22.109(10),c = 23.235(9),β = 106.096(17)o,C48H42Mn2N16Ni2O8,Mr = 1198.28,V = 5192(4)3,Dc = 1.533 g/cm3,F(000)= 2448,μ = 1.258 cm1,Z = 4,the final R = 0.0875 and wR = 0.2020 for 3398 reflections with I > 2σ(I).X-ray diffraction analysis reveals that each Mn(III)center is octahedrally coordinated by two nitrogen atoms of azide anions and three oxygen atoms from three 2-pyridinemethanol anion ligands together with one oxygen atom from naphthaleneacetate.Each Ni(II)is octahedrally coordinated by two nitrogen atoms of 2-pyridinemethanol anion ligands as well as three oxygen atoms from three 2-pyridinemethanol anion ligands and one oxygen atom from naphthaleneacetate.     

新显色剂4'-(对硝基苯基重氮氨基)-2,4-二硝基偶氮苯的合成及其与镉(Ⅱ)的显色反应研究

合成了新显色剂4'-(对硝基苯基重氮氨基)-2,4-二硝基偶氮苯(简称PNDNDAA),并研究了该试剂在Triton X-100存在下与镉(Ⅱ)的显色反应.在pH 8.0～9.5缓冲范围内,Cd(Ⅱ)与试剂形成稳定的1:1红色配合物,最大吸收波长位于560 nm,表观摩尔吸光系数为1.30×105L·mol-1·cm-...     

唐代铜佛像表面残片的拉曼光谱分析

本文利用共聚焦显微拉曼光谱(CRS)结合扫描电镜-X射线能谱(SEM-EDS)技术对唐代一铜佛像的表面成分、形态及元素组成进行了分析.结果显示,该铜佛像主要是由Cu- Pb- Sn三元青铜合金组成,表面腐蚀物主要是由氧化铜,氧化亚铜,碱式碳酸铜,氧化铅,氧化锡,碳酸铅和氯化铅组成,这些成分在空气中都比较稳定,不会再对铜...     

Facile fabrication and optical property of β-Bi<Subscript>2</Subscript>O<Subscript>3</Subscript> with novel porous nanoring and nanoplate superstructures

Novel β-Bi₂O₃ crystals with nanoring and nanoplate surperstructures, which are composed of porous nanoparticles with mean pore diameter of 8 nm, were produced via a facile soft chemistry route of solvent refluxing technique. Most of the rings have the average inner diameter of 200 nm and the mean rim thickness of 20 nm. Photoluminescence spectra of the nanorings at room temperature were investigated, which demonstrated that the rings presented excellent optical properties. The influence of aging time on the morphology and structure of β-Bi₂O₃ superstructures was also studied, indicating that the nanoring superstructures transformed into nanoplates after a long aging time. The formation mechanism of the β-Bi₂O₃ superstructures was also explored. This approach will be further extended to solvent-controlled fabrication of related oxides with novel complex superstructures.     

Antioxidant,Anti-Inflammatory and Antithrombotic Effects of Ginsenoside Compound K Enriched Extract Derived from Ginseng Sprouts

Partially purified ginsenoside extract (PGE) and compound K enriched extract (CKE) were prepared from ginseng sprouts, and their antioxidant, anti-inflammatory and antithrombotic effects were investigated. Compared to the 6-year-old ginseng roots, ginseng sprouts were found to have a higher content of phenolic compounds, saponin and protopanaxadiol-type ginsenoside by about 56%, 36% and 43%, respectively. PGE was prepared using a macroporous adsorption resin, and compound K(CK) was converted and enriched from the PGE by enzymatic hydrolysis with a conversion rate of 75%. PGE showed higher effects than CKE on radical scavenging activity in antioxidant assays. On the other hand, CKE reduced nitric oxide levels more effectively than PGE in RAW 264.7 cells. CKE also reduced pro-inflammatory cytokines, such as tumor necrosis factor-α, interleukin (IL)-1β and IL-6 than PGE. Tail bleeding time and volume were investigated after administration of CKE at 70–150 mg/kg/day to mice. CKE administered group showed a significant increase or increased tendency in bleeding time than the control group. Bleeding volume in the CKE group increased than the control group, but not as much as in the aspirin group. In conclusion, ginseng sprouts could be an efficient source of ginsenoside, and CKE converted from the ginsenosides showed antioxidant, anti-inflammatory and antithrombotic effects. However, it was estimated that the CKE might play an essential role in anti-inflammatory effects rather than antioxidant effects.