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Xiaochuan Z.,Chongqing Education College | Xiaochuan Z.,Key Laboratory of Applied Chemistry of Chongqing Municipality | Xiaochuan Z.,Chongqing Three Gorges University | Shaocheng C.,Chongqing Education College | And 14 more authors.
Science China Chemistry | Year: 2012

Chiral MnIII(salen) (Jacobsen's catalyst) was axially immobilized onto a new type of organic polymer-inorganic hybrid materialzirconium poly(styrene-isopropenyl phosphonate)-phosphate(ZPS-IPPA) with different linkage lengths and evaluated as catalysts for the epoxidation of unfunctionalized olefins. The results demonstrated that the prepared catalysts exhibited moderate to good activity and enantioselectivity in the asymmetric epoxidation of unfunctionalized olefins. Furthermore, the immobilized catalysts were relatively stable and could be conveniently separated from the reaction system by simple precipitation in hexane. Moreover, higher enantioselectivity was obtained with catalyst 2c than that of homogeneous counterpart catalyzed even after eight times. The excellent recycling of the catalyst was attributed to its structure feature of ZPS-IPPA which is different from either pure polystyrene or pure zirconium phosphates. © Science China Press and Springer-Verlag Berlin Heidelberg 2012. Source


Yu X.,Southwest University | Yu X.,Key Laboratory of Applied Chemistry of Chongqing Municipality | Fu X.-K.,Southwest University | Fu X.-K.,Key Laboratory of Applied Chemistry of Chongqing Municipality | And 3 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2010

In order to develop novel electrochromic materials, a series of N-substituted phenothiazine derivatives (PDs) were synthesized via SN2 reaction and characterized by 1HNMR, 13CNMR and IR. Their electrochemical properties and spectrachemical properties were examined by cyclic voltammetry and UV-Vis. It was found that PDs as anodic electrochromic material and viologen as cathode electrochromic material in the composite electrochromic devices (ECDs) showed reversible, clear color changes on electrochemical doping and dedoping process, and electrochromic effect was observed a color change from blue to red. The PDs synthesized are promising candidate materials for visible ECDs, for their outstanding electrochromic behaviors plus the cheap original stuff and short synthetic routes. Source


Du Q.-L.,Southwest University | Du Q.-L.,Key Laboratory of Applied Chemistry of Chongqing Municipality | Fu X.-K.,Southwest University | Fu X.-K.,Key Laboratory of Applied Chemistry of Chongqing Municipality | And 5 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2011

N-vinylimidazole, methyl bromoacetate and lithium trifluoromethanesulfonimide (LiTFSI) being the materials, poly(methyl 2-(3-vinylimidazolidin-1-yl) acetate trifluoromethanesulfonimide (PMVIm-TFSI) was synthesized by solution polymerization. Different composition of polymer electrolytes were prepared by blending PMVIm-TFSI with LiTFSI and poly(methyl methacrylate-co-vinyl acetate) (P(MMA-VAc)). 1H NMR, FT-IR, DSC, TGA, XRD, SEM and AC impedance results revealed that when PMVIm-TFSI was added into polymer electrolytes consisting of P(MMA-VAc)/LiTFSI, the thermal stability and ionic conductivity improved significantly, the maximum of which is 4.71×10-4S/cm at 30°C. Moreover, P(MMA-VAc)/PMVIm-TFSI/LiTFSI electrolyte membrane (transmittance≥90%) can be used as the ion-conductive layer material for electrochromic devices (ECDs), which revealed excellent electrochromic performance. Source


Wang C.,Southwest University | Wang C.,Key Laboratory of Applied Chemistry of Chongqing Municipality | Fu X.,Southwest University | Fu X.,Key Laboratory of Applied Chemistry of Chongqing Municipality | And 3 more authors.
Acta Chimica Sinica | Year: 2011

New types of supported catalysts were obtained by anchoring chiral salen Mn (III) complex on a series of alkoxyl-modified zirconium poly (styrene-phenylvinyl phosphonate) phosphate (ZPS-PVPA) in the text. All the prepared catalysts were characterized by FT-IR, UV-vis, XPS, SEM, TG and elemental analysis. The catalytic capabilities were investigated with m-CPBA as an oxidant and with indene and α-methylstyrene as substrates for asymmetric epoxidation of unfunctionalized olefins. Contrary to most of the literatures reported, the results showed that the heterogeneous catalysts 3a~3f exhibited excellent catalytic activities, and their conversions and ee values increased remarkably in the absent of N-methylmorpholine N-oxide (NMO) under the same catalytic conditions. Futhermore, these catalysts were easily separated and reused ten times without significant loss of activities. Source


Tu X.,Southwest University | Tu X.,Key Laboratory of Applied Chemistry of Chongqing Municipality | Fu X.,Southwest University | Fu X.,Key Laboratory of Applied Chemistry of Chongqing Municipality | And 3 more authors.
Displays | Year: 2010

In order to develop novel electrochromic materials, a series of N-substituted phenothiazine derivatives (PDs) were synthesized via S N2 reaction and characterized by NMR, IR spectroscopy. Their electrochemical properties were investigated using cyclic voltammetry and their spectrochemical properties were examined by UV-vis spectroscopy. It was found that phenothiazine derivatives in electrochromic devices (ECDs) showed reversible, clear color changes on electrochemical process. An electrochromic effect was observed with a color change from colorless to red or green for the phenothiazine derivatives synthesized. The phenothiazine derivatives synthesized are promising candidate for visible electrochromic devices, for their outstanding electrochromic behaviors plus the inexpensive starting materials and short synthetic routes. © 2010 Elsevier B.V. All rights reserved. Source

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