VPO催化剂前驱体的溶液法合成和结构研究

VPO polymer β NH 4(VO 2)(HPO 4) was synthesized from the mixture of NH 4VO 3 and NH 4H 2PO 4 in aqueous acidic solution. This hydrogenphosphate vanadate crystallizes in the orthorhombic space group Pbca with a=0.680 60(8) nm, b=0.925 70(5) nm, c=1.773 70(2) nm, V=1.117 5(3) nm 3, Z=8, D c=1.743 g·cm -3 , μ=88.54 cm -1 and R=0.051. The structure is built up from VO 5 square pyramid linked by trans vertices through the bridged oxygen atom to form an one dimensional isolated chain of {VO 2HPO 4} n- nunning along the a axis

PREPARATION OF QUATERNARY CINCHONINE TARTRATE SALTS BY MICRO COLUMN CHROMATOGRAPHY

报道了用微型柱色谱制备用于不对称相转移催化和多相不对称催化合成的辛可宁季铵盐Preparation of quaternary cinchonine tartrate salts by micro column chromatography is described.国家自然科学基金资助项目 ( 2 99330 4 0

柠檬酸镍前驱体热分解制备镍酸镁复氧化物纯相

以组成和结构确定的柠檬酸配合物Mg2NiHcit2·10H2O和MgNiHcitH2O2·8H2OH4cit为柠檬酸为前驱体热分解得到Ni和Mg摩尔比分别为1∶2和2∶1的镍酸镁纯相Mg2NiO3和MgNi2O3。粉末衍射实验证实它们是由半径相近、价态相等的Ni2+和Mg2+形成的固溶体

Hydro(solvo)thermal construction of a copper coordination polymer involving in situ ligand synthesis: Preparation and Structure of [Cu-3(bdcO)(2)(H2O)(2)](n)

A hydro(solvo)thermal reaction of 1,3-benzenedicarboxylic acid (bdcH(2)) and CuSO4.5H(2)O produced a coordination polymer [Cu-3(bdcO)(2)(H2O)(2)](n) 1. The alkoxyl-1,3-benzene-dicarboxylate trianion (bdcO(3-)) found in the final product was in situ generated by the hydroxylation of bdcH(2) during the synthesis. Its crystal structure has been determined by X-ray structural analysis. The complex belongs to a monoclinic system, space group P2(1)/c with C16H10Cu3O12, M-r = 584.86, a = 5.0349(3), b = 10.422(1), c = 15.639(1) angstrom, beta = 91.977(2)degrees, V = 820.1(1) angstrom(3), Z = 2, D-c= 2.368 g/cm(3), mu = 3.931 mm(-1), lambda(MoK alpha) = 0.71073 angstrom, F(OOO) = 578, the final R = 0.0328 and wR = 0.0742 for 1730 observed reflections with 1 >=,2 sigma(I). The copper atoms show different coordination environments. Each bdcO group is binds to three copper atoms through oxygen atoms of carboxylates and deprononated hydroxy group in bridging and chelating fashions, affording a copper atom coordinated by two [Cu-2(bdcO)(2)](2-), matallo-ligand' to yield an extending zigzagged layer perpendicular to the c axis

柠檬酸镍(Ⅱ)配合物的合成、光谱和晶体结构

在弱酸性介质中，氯化镍和柠檬酸铵反应可得到镍水合离子与二聚柠檬酸镍配离子的加合配合物（ＮＨ４）［Ｎｉ（Ｈ２Ｏ）６］［Ｎｉ（Ｈｃｉｔ）（Ｈ２Ｏ）２］４·１０Ｈ２Ｏ１。该配合物的晶体属三斜晶系，空间群为Ｐ１，晶胞参数：ａ＝９．７２７３（９），ｂ＝１２．０３４（２），ｃ＝１３．３４８（２），α＝６３．５４（２），β＝８８．４５（１），γ＝８６．２８（１）°，Ｖ＝１３９５．９（３）３，Ｚ＝１，配合物的阳离子为两个铵离子和一个六水合镍离子，阴离子由两个二聚柠檬酸镍［Ｎｉ（Ｈｃｉｔ）（Ｈ２Ｏ）２］２－２组成。在不对称的配阴离子中，两个柠檬酸分别以羟基、α－羧基和一个β－羧基同第一个镍配位，剩下的β－羧基作为桥基同另一个镍配位形成二聚体

The first structural examples of tricitratotitanate [Ti(H(2)cit)(3)](2-) dianions

The crystal structures of the mixed-cation compounds Mg-1/2[Ti(H(2)cit)(3)].6H(2)O and (NH4)Mg-1/2[Ti(H(2)cit)(3)].-6H(2)O (H(4)cit = citric acid), which were synthesized by a modified Pechini process, feature three bidentate [(HO2CCH2)(2)C(CO2-)O-] citrato groups that chelate to the titanium atom through their negatively-charged alpha-alkoxyl and alpha-carboxyl oxygen atoms; the other two beta-carboxylic acid groups are free

新型手性修饰剂的设计合成

国家自然科学基

Preparations of pure alkaline earth molybdate phases from single molecular precursors

The pure phases of alkaline earth molybdates MMoO4, where M=Mg, Ca, Sr or Ba, were synthesized via the calcination of the related citrato oxomolybdate complexes. The mixed metal oxides can be highly dispersed at the atomic level due to the existence of uniform citrato oxomolybdenum precursors in definite composition. The complexing effect helps to produce the fine-grained oxides with particle size in the ultrafine scale(<100 nm) at heat-treatment temperatures below 500 degreesC. The structures of the precursor complexes and the finally heat-treated particles were studied by means of IR, XRD, DSC, DTA and TG techniques. The morphologies of the particles were observed by using the SEM technique. The average particle sizes were calculated to be in the range of 30-50 nm based on X-ray diffraction line-broadening and SEM images, indicating the poor conglomeration of crystallite at low temperatures

software collaborative working model for outsourcing

中国计算机学