The copolymerization of ethylene with dicyclopentadiene （DCP） in the presence of a constrained geometry tetramethylcyclopentadi-enyl-phenoxytitanium catalyst [2,4-tBu2-6-（2,3,4,5-Me4-Cp）-PhO]TiCl2, combined with Al（ i Bu）3/Ph3C + B（C6F5）-4 cocatalyst system was studied. The copolymers that were formed were characterized by 1 H and 13 C NMR, differential scanning calorimetry （DSC）, SEM, and X-ray diffraction （XRD） analyses. The results of the analysis indicate that the copolymers of ethylene with dicyclopentadiene are amorphous and display two or more melting temperatures in their DSC diagrams. Moreover, the morphologies of the copolymers are quite different from that of polyethylenes.
A novel blue luminescent mercury(Ⅱ) complex of 2,6-bis(benzimidazolyl)pyridine( L ) was synthesized. In solid state, this complex has the formula [Hg( L )Cl2]52DMF([STHZ]1[STBZ]). The molecular structures of both the ligand and the complex were determined by using single-crystal X-ray diffraction. Crystallographic studies of the mercury(Ⅱ) complex reveal that the complex possesses a five-coordinated geometry that can be best described as a distorted trigonal-bipyramidal. The luminescent properties of ligand L and complex [STHZ]1[STBZ] both in solution and in solid state were also studied.
LIU Xiao-mingMU Xiao-yueXIA HongSU QingYE LingCHEN ChaoGAO WeiMU Ying
