Synthesis And Characterization Of Compounds Based On Aza-Crown Ethers And Polyoxometalates

Crown ethers have been attracted most interests in the study of assemble,materials and bioscience due to their structures and properties.In recent years,azacrown ether complexes have been developed rapidly because of their potential applications in ion exchange,gas storage,magnetism,fluorescence,sensor,catalyst and drug delivery.Azacrown ethers containing the aromatic rings with rigid plane can be used widely,which may be generated stable compounds coordination polymers in the process of supramolecular self-assembly chemistry.In this paper,three kinds of azacrown ether ligands L1,L2 and L3 were synthe sized based on the 2,6-two-formaldehyde-4-methyl phenol,3,3’-diaminodipropylamine,ethanediamine,propylene diamine have been synthesized.Further,five compounds o f[(Mo8O26)(L1)]·4H2O(1),[(Mo10MnO37)(L1)]·2H2O(2),[(PMo12O40)3·(L1)3]·4CH3OH·2 H2O(3),[Cu2(Mo8O26)(L2)]·(NH2CH2CH2NH2)(4),[Cu4(L3)2(Mo8O26)2](5)(L1=2,6,10,17,21,25-six-aza-[24,2,2,2]-1,12,13,15,26,27-six-azacrown ether,L2=10,21-dimethyl-3,6,14,17-tetraaza-tricyclo[17,3,1,18,12]tetracosa-1(23),8,10,12(24),19,21-hexaene-23,24-diol,L3=11,23-dimethyl-3,7,15,19-tetraaza-tricyclo[19,13,1,19,13]-hexacosa-1(25),9,11,13(26),21,23-hexaene-25,26-diol)have been synthesized by adjusting the ratio of the solvent,temperature and reaction time.Moreover,the five compounds were characterized by X-ray diffraction,IR and TGA.For compound 1,the polyoxometalates are connect ed by the azacrown ethers to form a ID chain,and the chains are expanded to a 2 D layer.Compounds 2 and 3 show discrete molecules,and the compound 2 is exte nded 2D layer through H-bonds and π…π interactions,while compound 3 is expande d to two different chains respectively.Compound 4 shows a 1D azacrown ether-pol yoxometalate-azacrown ether chain,and the chains are expanded to a 2D superamol ecular structure.Compound 5 exhibits 0D hamburger structure,and the 0D hamburg er is extended to 3D superamolecular structure by π………π and C-H…O interactions.Further,the organic dye absorption properties have been also investigated for comp ounds 1-3.The compounds 1-3 have achieved a better absorption result for CR and MB with short time and favorable effect.