The title compound [Mn(phendione)(PDC)(H2O)2]·2H2O (H2PDC=pyridine-2,6-dicarboxylic acid) has been prepared in aqueous solution and characterized by single X-ray diffraction structure determination, elemental analysis, IR spectroscopy, and thermal analyses. The compound crystallizes in Monoclinic system, space group C2/c, a=1.017 51(11) nm, b=1.483 25(11) nm, c=1.461 21(13) nm, β=109.86(10)°, V=2.074 1(3) nm3, Z=4, F(000)=1 028, μ=0.701 mm-1, Dc=1.609 g·cm-3, R1=0.028 9, wR2=0.078 8 [I>2σ(I)]. Crystal structure reveals that complex consists of one-dimensional chain framework bridged by hydrogen bonds that formed by uncoordinated water and oxygen atom of carboxyl group in PDC2-. Furthermore, the complexes form a three-dimensional super-molecular structure through hydrogen bonds. CCDC: 648570. 相似文献
A new Cu(II) coordination polymer, {[Cu(1,3-BIP)(TFBDC)]·DMF}n(1,1,3-BIP is a 1,3-bis(imidazole)propane, and H2TFBDC is 2,3,5,6-tetrafluoroterephthalic acid) was prepared under solvothermal conditions and characterized by single-crystal and powder X-ray diffraction, IR spectra, thermogravimetric analyses and elemental analyses. The single-crystal X-ray diffraction reveals that metal coordination polymer 1(MCP 1) shows a two-dimensional sheet layer structure, which is further reinforced through strong intermolecular hydrogen bonding to form a 3 D supramolecular framework. Furthermore, the photocatalytic experiment result indicates the degradation ratios of methyl orange(MO) reach 83.4% within 180 minutes when MCP 1 acts as catalyst. 相似文献
This paper is concerned with the problem of robust H∞ control for a novel class of uncertain linear continuous-time systems with heterogeneous time-varying state/input delays and norm-bounded parameter uncertainties.The objective is to design a static output feedback controller such that the closed-loop system is asymptotically stable while satisfying a prescribed H∞ performance level for all admissible uncertainties.By constructing an appropriate Lyapunov-Krasvskii functional,a delay-dependent stability criterion of the closed-loop system is presented with the help of the Jensen integral inequality.From the derived criterion,the solutions to the problem are formulated in terms of linear matrix inequalities and hence are tractable numerically.A simulation example is given to illustrate the effectiveness of the proposed design method. 相似文献
Two metal coordination polymers, namely {[Co(1,3-BIP)(OBA)]·0.5H2O}n (SNUT-1) and [Co2(µ-η1:η1-O2)(1,3-BIP)2(PMA)]n (SNUT-2), where 1,3-BIP?=?1,3-bis(imidazol)propane, H2OBA?=?4,4′-oxybis(benzoate) and H4PMA?=?benzene-1,2,4,5-tetracarboxylic acid, were prepared by hydrothermal methods. Single-crystal X-ray analysis revealed that the structure of SNUT-1 consists of a 3D?→?3D twofold interpenetrating network that can be described as a 4-connected uninodal net with (65·8) topology. The structure of SNUT-2 consists of a 3D framework which can be described as a (4,5)-connected binodal net with (42·63·84·10) (33·42·5) topology. The gas adsorption properties of SNUT-1 and photocatalytic activity of SNUT-2 for the degradation of Rhodamine B have been explored.
A novel Lamb wave frequency-mixing technique is proposed for locating microcracks in a thin plate,which does not require the resonance condition of Lamb wave mixing and can accurately locate the microcracks through only one-time sensing.Based on the bilinear stress-strain constitutive model,a two-dimensional finite element(FE)model is built to investigate the frequency-mixing response induced by the interaction between two primary Lamb waves and a microcrack.When two primary Lamb waves of A0 and S0 modes with different frequencies excited on the same side of the plate simultaneously impinge on the examined microcrack,under the modulation of the contact acoustic nonlinearity,the microcrack itself can be deemed as the secondary sound source and it will radiate the Lamb waves of new combined frequencies.Based on the time of flight of the generated A0 mode at difference frequency,an indicator named normalized amplitude index(NAI)is defined to directly locate the multi-microcracks in the given plate.It is found that the number and location of the microcracks can be intuitively visualized by using the NAI based frequency-mixing technique.It is also demonstrated that the proposed frequency mixing technique is a promising approach for the microcrack localization. 相似文献