The reaction of lanthanum（Ⅲ） nitrate and 5-nitroisophthalic acid in isopropanol/H2O under hydrothermal conditions leads to a 3D lanthanum-containing coordination polymer with the general chemical formula {[La6（Nip）9（H2O）4 ]·（H2O）4 }∞（1,Nip=5-nitroisophthalate）.The single-crystal X-ray analyses show that this compound crystallizes in the orthorhombic system,space group Ima2 with a=9.7769（12）,b=28.239（3）,c=21.149（2）,V=5839.1（11）3,Z=2,Mr=2859.61,Dc =1.626 g/cm 3,F（000）=2752.14040 reflections are collected,of which 5275 are unique （R int=0.0241）.Final GOOF=1.083,R=0.0406 and wR=0.1182,R indices based on 5183 reflections with I〉2σ（I）（refinement on F2）,443 parameters,1 restraint.Lp and absorption corrections were applied,=2.242mm-1.Absolute structure parameter x=0.08（3）.The crystal structure can be described as the butterfly-liked hexanuclear lanthanum entities {La6O6（CO2）8 } covalently linked to each other by nitroisophthalate ligands into an intricate three-dimensional structure.The fluorescence spectroscopy of compound 1 has been investigated.
The polyoxometalate（POM）-imidazole ionic liquid（IL） [C8mim]2[Mo6O19]（C8mim=1-methyl-3-octylimi- dazolium） with a low melting point of 82.6 °C was successfully prepared and characterized by FTIR, XPS, NMR, TG and so on. The polyoxomolybdate-based IL has high stability, and its decomposing temperature reaches 321 °C, which is higher than that of 1-alkyl-3-methylimidazolium halides IL. Further photocatalytic performances of the IL were measured via degrading dye rhodamine B（RB） in aqueous solution under the UV light irradiation. The experiments show that the conversion of RB reaches 80.5% after 90 min under UV-light and the degradation efficiency depends on the pH value of the solution, irradiation time and the dosage of the IL and so on.
DONG Tao XU Yan-qing CHEN Fa-wang CHI Ying-nan HU Chang-wen
The green synthesis of chloropropylene carbonate via the coupling reaction of carbon dioxide and epichlorohydrin had been achieved using halogen-free and single-component catalysts tetrabutylammonium salts of tritransition-metal-substituted A-α- tungstogermanate [（n-C4H9）4N]3H7GeW9M3（H2O）30O7 （M = Cu^Ⅱ, Ni^Ⅱ, Co^Ⅱ and Mn^Ⅱ） without any solvent. The catalytic activity was significantly depended on the transition metal introduced in polyoxometalates. [（n-C4H9）4N]3H7GeW9Mn3（H2O）3O37 exhibited the highest catalytic activity with 94.9% conversion for epichlorohydrin and 98% selectivity for chloropropylene carbonate in 3 h. Plausible mechanism was proposed based on the results.
Fa Wang ChenTao DongXiao Fang LiTie Gang XuChang Wen Hu
The polyoxometalate-imidazole ionic liquids（POM-ILs） with low melting points at 94.5 and 95.5 ℃, [Cn mim]a[MosO26]（Cn mim=1-alkyl-3-methylimidazolium, n=12,14）, have been successfully synthesized and characterized by DSC, single-crystal X-ray diffraction and TGA, etc. The two POM-ILs have relatively high stability with decomposing temperature up to about 347 and 344 ℃, respectively. Further photocatalytic performance was measured via the degradation of rhodamine B（RB） in aqueous solution. The experiments show that the conversion reached to 90% after 90 min under UV-light and the degradation efficiency depended on pH value, different dosages and so on. In addition, the catalysts can be recycled for several times without significant loss of activity.
