Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology

Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology


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Wang S.,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology | Ma R.,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology | Chen Z.,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology | Li Y.,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology | And 3 more authors.
Science China Chemistry | Year: 2016

Two types of lanthanide coordination polymers, namely, [Ln(PA)(NO3)(DMA)3]n (Ln=Gd (1), Dy (2), Eu (3), Tb (4)) (type I), and {[Ln2(PA)3(DMF)4]·2DMF} (Ln=Eu (5), Tb (6)) (type II) (PA=Pamoic acid, DMA=dimethylacetamide, DMF=N,N-dimethylformamide), have been synthesized by the reaction of Ln(NO3)3·6H2O with pamoic acid through layer diffusion method. These complexes were characterized by single crystal X-ray diffraction, infrared spectroscopy (IR), thermogravimetric analysis (TGA), fluorescence and magnetic measurements. Solvents and lanthanide atoms in the reaction play an important role in controlling different structures. Type I demonstrated 1-D linear chain structure connected by Ln atoms and PA ligands. Type II exhibited non-interpenetrating 3-D 6-connected 43612 nets based on binuclear [Ln2(CO2)6(DMF)4] cores. Magnetic properties of complexes 1–4 were investigated in details. Complex 1 shows significant magnetocaloric effect with–ΔSm=20.37 J kg–1 K–1 at 3.0 K and 7 T. Complex 2 exhibits slow relaxation of the magnetization. Complexes 3–6 exhibit both ligand- and metal-centered fluorescent properties. Complex 6 demonstrates fluorescent sensing of DMF and Cu2+ ion. © 2016, Science China Press and Springer-Verlag Berlin Heidelberg.


Zhao J.,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology | Chen G.,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology | Zhang W.,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology | Li P.,Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology | And 6 more authors.
Analytical Chemistry | Year: 2011

Separation and purification of graphene oxide (GO) prepared from chemical oxidation of flake graphite and ultrasonication by capillary electrophoresis (CE) was demonstrated. CE showed the ability to provide high-resolution separations of GO fractionations with baseline separation. The GO fractionations after CE were collected for Raman spectroscopy, atomic force microscopy, and transmission electron microscopy characterizations. GO nanoparticles (unexfoliated GO) or stacked GO sheets migrated toward the anode, while the thin-layer GO sheets migrated toward the cathode. Therefore, CE has to be performed twice with a reversed electric field to achieve a full separation of GO. This separation method was suggested to be based on the surface charge of the GO sheets, and a separation model was proposed. This study might be valuable for fabrication of GO or graphene micro- or nanodevices with controlled thickness. © 2011 American Chemical Society.

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