A novel flower-like hydrated magnesium carbonate hydroxide, Mg5 （CO3 ）4 （OH）2·4H2O, with micro-structure composed of individual thin nano-sheets was synthesized using a facile solution route without the use of template or organic surfactant. Reaction time has an important effect on the final morphology of the product. The micro-structure and morphology of Mg5 （CO3）4 （OH）2·4H2O were characterized by means of X-ray diffractometry （XRD）, fieldemission scanning electron microscopy（FE-SEM）. Brunauer-Emmett-Teller（BET） surface areas of the samples were also measured. The probable formation mechanism of flower-like micro-structure was discussed. It was found that Mg5 （CO3）4（ OH）2·4H2O with flower-like micro-structure was a novel and efficient catalyst for the synthesis of diphenyl carbonate （DPC） by transesterification of dimethyl carbonate （DMC） with phenol.
WANG QiangWANG Ke-liWU Xing-longLUO Sheng-junHU Chang-wen
A new three-dimensional supramolecule composed of copper-Schiff base complex,[Cu(naphdien)]Cl·H2O,where naphdien is Schiff base of 2-hydroxy-1-naphthaldehyde and diethylenetriamine,has been synthesized and determined by single-crystal X-ray diffraction.It belongs to the monoclinic system,space group P2_(1)/c,with a=7.3490(15),b=7.0847(16),c=30.845(3)A,β=95.33(3)°,V=1599.0(5)A^(3),Z=4,C_(15)H_(20)ClCuN_(3)O_(2),Mr=373.33,D_(c)=1.551 g/cm^(3),μ=1.543 mm^(-1),F(000)=772,R=0.0536 and wR=0.0927 for 2788 unique reflections with 1659 observed ones(I〉2σ(I)).In the crystal structure,mononuclear units[Cu(naphdien)]Cl·H_(2)O are linked into a two-dimensional framework via strong hydrogen bonds,and extended into a three-dimensional supramolecular structure throughπ-πstacking interactions.
6-（3,5-Dimethylpyrazol-1-yl）-3-（2,4,6-trinitroanilino）-1,2,4,5-tetrazin （1） has been synthesized and characterized by ^1H NMR, MS, elemental analysis, infrared spectra and thermal analyses. The crystal structure was determined by X-ray diffraction method. 1 is crystallized in P21/c space group of monoclinic crystal system, and exhibits good physical properties, such as high densities （〉 1.55 g·cm^-3） and good thermal stabilities （Td〉220 ℃）. The intrermolecular hydrogen bonds construct the P- and M-helices from organic molecules and may contribute to the high melting points.
A new 1D infinite neutral chain （Ph3SnO2SeOCH2CH3）n （1） based on organotin and selenious acid monoethyl ester has been synthesized successfully and characterized by IR, elemental analysis, and X-ray single-crystal diffraction. In the compound 1, the Sn atom exists in slightly distorted trigonal bipyramidal geometry and the Se center is tri-coordinated with a distorted pyramidal arrangement. It is noted that the synthesis is facile and selenium oxide is directly introduced into synthesis route replacing organoseleninic acid under room temperature.
