Li C.Y.,Hubei University |
Cai D.M.,Hubei University |
Yin J.C.,Hubei University |
Cai L.P.,Hubei University |
And 4 more authors.
Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya | Year: 2016
Two nine-coordination coordination polymers of neodymium, [Nd2(p-C8H4O4)(o-C8H4O4)2 • 4H2O]n (I), [Nd2(C10H4O8)(C10H2O8) • 2H2O]n (II), have been prepared by hydrothermal reaction of Nd(NO3)3 • 6H2O with terephthalic acid and phthalic acid, or benzenetetracarboxylic anhydride and determined by means of IR, UV, fluorescence, TG-DTA, cyclic voltammetry (CV) and X-ray single-crystal diffraction methods (CIF files CCDC nos. 1006206 (I), 979309 (II)). Yellow-green luminescence could been observed at 391 nm (λex = 305 nm) for complex I and 370 nm (λex = 331 nm) for the complex II. The emission of complexes I and II may be due to the π* → n transition, which may be assigned to the ligand-to-metal charge-transfer bands. Compared with complex II, the complex I exhibits a stronger fluorescence intensity for the different coordinated environment. Cyclic voltammetric measurement of the two compounds reveal that the compounds both have a couple of irreversible redox peak, indicating that the two polymers were both corresponded to the unusual Nd(III)/Nd(V). © 2016, Pleiades Publishing, Ltd.
Wang J.,Hubei University |
Xu C.,Hubei University |
Hu H.,Hubei University |
Wan L.,Hubei University |
And 7 more authors.
Journal of Nanoparticle Research | Year: 2011
Precise interface control and dispersal of graphene nanosheets in polymer hosts are challenging to develop high performance graphene-based nanocomposites due to their strong interlayer cohesive energy and surface inertia. Here, we firstly report an efficient and novel method to functionalize graphene nanosheets with vinyl triethoxysilane (VTES) and successfully blend them with low density polyethylene (LDPE) to prepare nanocomposites. Fourier transforms infrared spectra (FTIR), Raman spectra, and thermogravimetric analysis (TGA) proved that the graphene sheets were covalently bonded with VTES. The resulting nanocomposites obtained the increases of up to 27.0 and 92.8% in the tensile strength and Young's modulus, respectively, compared to neat LDPE. The VTES - graphene not only remarkably improved the tensile strength of the composites, but also enhanced its toughness by 17.7%. Oil permeability measurements showed that the absorption ratio of toluene by the LDPE/graphene composites decreased from 56 to 39%, and its barrier properties have obviously been improved. This study opens a new route to optimize interface structures and improve the comprehensive performances of graphene - polymer nanocomposites. © Springer Science+Business Media B.V. 2010.
Ren J.,Key Laboratory for the Synthesis and Application of Organic Functional Molecules |
Wu Z.,Key Laboratory for the Synthesis and Application of Organic Functional Molecules |
Zhou Y.,Key Laboratory for the Synthesis and Application of Organic Functional Molecules |
Li Y.,Key Laboratory for the Synthesis and Application of Organic Functional Molecules |
Xu Z.,Key Laboratory for the Synthesis and Application of Organic Functional Molecules
Dyes and Pigments | Year: 2011
A colorimetric chemosensor TBS-NA, 4-(tert-butyldimethylsilyloxy)-N-butyl- naphthalimide was designed and synthesized. Addition of fluoride ion to a CH3CN solution of TBS-NA can result in an obvious color change (from colorless to yellow) and UV-Vis absorption spectral change in a short time. This indicated that TBS-NA had highly selectivity for fluoride detection over other anions, such as Cl-, Br-, I-, HSO4-, ClO4- and AcO- in CH3CN solutions, and the selectively detection was due to the selective cleavage of Si-O bond in TBS-NA by fluoride. The detection limit was calculated to be 0.59 μM. © 2011 Elsevier Ltd. All rights reserved.