几种杂多阴离子柱撑水滑石的合成与吸附行为

柱撑水滑石类层柱状阴离子粘土是一类新型层柱材料，由于其二维孔道结构的可调变性及潜在的择形催化性能，已引起人们的重视[1-3]．迄今，人们已合成了包括无机和有机阴离子，同多和杂多阴离子（Polyoxometalates，简称POMs）以及配合物阴离子在内的多种柱撑水滑石，其中同多和     

Zn_2Al－PW_（12－n）V_nO_（40）（n＝1～4）的合成与表征

Ｚｎ_２Ａｌ－ＰＷ_（１２－ｎ）Ｖ_ｎＯ_（４０）（ｎ＝１～４）的合成与表征郭军，孙铁，沈剑平，蒋大振闵恩泽（吉林大学化学系，长春，１３００２３）（石油化工科学研究院）关键词Ｐ－Ｗ－Ｖ杂多阴离子，柱撑水滑石，合成同多和杂多阴离子柱撑水滑石（简称ＰＯＭｓ－...     

Regioselective A-Ring Chlorination of Benzodiazepine Analogues Using tert-Butyl Hypochlorite

Treatment of 2-phenyl-2,3-dihydro-1,4-benzodiazepin-5(4H)-one and a series of 1,4-benzoxazepinone analogues with tert-butyl hypochlorite affords products shown, by NMR and MS spectroscopy, to be chlorinated exclusively in the A-ring at positions 7 and/or 9.     

表面预处理对镁铝水滑石结构性质和缓释性能影响

以Mg-Al-NO₃水滑石（LDHs）为载体,将5-氟尿嘧啶（5-FU）通过离子交换法插入其层间,得5-FU/LDHs缓释材料。并对水滑石表面进行弱酸预处理改性,利用XRD、FTIR、TG-DSC、SEM和零电荷点（pHPZC）等表征手段,考察酸预处理对水滑石表面化学性质及微观结构的影响。结果表明,5-FU/LDHs的层间距从0.858nm扩大到1.064nm,层间5-FU₂阴离子与主体层板通过氢键与静电作用,以呈一定角度单层交替排列于层间。酸预处理的水滑石粒径变小,层板正电荷密度增大。5-FU的释放机理是物理扩散、离子交换和药物溶解等协同作用,酸预处理可提高水滑石的缓释性能和稳定性。     

Thermal Stability of Sol-Gel Hydrotalcites

Sol-Gel Hydrotalcites were synthesized using magnesium ethoxide and variable aluminum sources: aluminum acetilacetonate, aluminum chloride, aluminum nitrate and aluminum sulfate; in all cases, the gelation was done at pH 10. X-ray diffraction studies show that the crystallinity depends on the aluminum precursor used. The crystallinity was found in the order aluminum acetylcetonate>aluminum chloride>aluminum nitrate>aluminum sulfate. The precursor determines the sintering behavior as well.     

Application of Nanoparticles in Polymers for Electronics and Electrical Engineering

Different organophilic layered silicates and a modified hydrotalcite were used as functional nanofillers for thermoplastic and thermosetting polymers. Polyamide 6 (PA6) and poly(butylene terephthalate) silicate nanocomposites were prepared by melt compounding using a twin‐screw extruder. The morphology of the materials was investigated by transmission electron microscopy and small‐angle X‐ray scattering, and was found to be characterized by homogeneous dispersion of high aspect ratio silicate layers in the polymer matrix. The PA6 nanocomposite displayed excellent thermo‐mechanical properties at low filler loadings and improved barrier properties. Epoxy nanocomposites have also been prepared and characterized with regard to their morphology and their water vapor permeability.     

反相气相色谱法探究铜镁铝水滑石的表面性质

采用共沉淀法合成了Cu_xMg_3-xAl-LDHs (x＝0～3), 利用FTIR 及IGC 法(反相气相色谱法)对合成的样品进行测试和表征, 并结合计算机模拟的结果来探讨铜镁铝水滑石的表面性质. 结果表明, 随 Cu²⁺含量的增加, 铜镁铝水滑石表面吸附自由能及表面能色散组分增加, 稳定性下降, 这可能由于Cu²⁺本身具有的Jahn-Teller 畸变会很大程度地影响层板的稳定性, 导致含铜水滑石体系的稳定性降低; 随着Cu²⁺含量的增加, 水滑石表面碱性先减小后增大.     

Catalytic applications of hydrotalcite-like materials and their derived forms

Hydrotalcite-like (HT-like) materials have been studied extensively in the last three decades. Although these materials initially perceived as potential anion exchangers, unrelenting efforts have also been attempted to use them as catalytic materials or as catalytic supports. There are varied ways by which one can use them for catalysis viz.; 1. Use them in as-synthesized form 2. Use them after calcining where the structural integrity of layered lattice is lost 3. Use the interlayer as functional spaces with moieties of catalytic interest 4. Use them after destruction or delamination and restructuring and 5. Use them as support or matrix. In this review, we are reporting the catalytic applications of HT-like materials and their derived forms carried out in our research group for the last 15 years in these various ways, covering reactions such as nitrous oxide decomposition, selective oxidation of organic compounds of industrial relevance and base-catalyzed isomerization of chemicals of perfumery interest. Although this review primarily focuses on our work, wherever applicable, related or relevant works from other groups are also presented to bestow comprehensiveness.     

MgAlFe复合氧化物吸收SO2后的再生

对吸收ＳＯ２后的ＭｇＡｌＦｅ复合氧化物进行了氢气还原再生的研究，通过对ＭｇＡｌＦｅ复合氧化物ＢＥＴ、ＸＲＤ表征和用氢气对其还原度的测定。发现复合氧化物在再生时有不同的起始还原温度，而且随着Ｆｅ元素的加入起始反应温度随之下降，还原度增加，还原用氢气浓度在１５－１００％范围内基本不影响材料的还原速率和还原度。氧化物经过１０次吸收和再生实验，它的吸收容量除了第一次有下降外，以后基本不变。     

过氧杂多阴离子柱撑水滑石类层状化合物的合成与表征

以硝酸根型水滑石作交换前驱体，通过离子交换法合成了过渡金属离子一、三钛取代的Ｋｅｇｇｉｎ结构过氧钨硅杂多阴离子柱撑水滑石Ｚｎ２Ａｌ（ＯＨ）６－［ＳｉＷ１１（ＴｉＯ２）Ｏ３９］及Ｚｎ２Ａｌ（ＯＨ）６－［ＳｉＷ９（ＴｉＯ２）３Ｏ３７］，用元素分析、ＸＲＤ、ＩＲ、ＸＰＳ、化学分析等手段对产物的组成和结构进行了表征。结果表明，过氧杂多阴离子进入水滑石层间，使水滑石的层间距从０．９２ｎｍ增加到１．４７ｎｍ。