Secondary spacer modulated assembly of polyoxometalate based metal-organic frameworks

  • Sha J
  • Sun J
  • Li M
 et al. 
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To investigate the influence of a secondary spacer on the resulting structures of POMOFs containing pytz, five new compounds with different dimensionalities, [Cu5(2-pytz)6(H2O)4][SiMo12O40][middle dot]3H2O (1), [Cu3(2-pytz)4bipy][H2SiMo12O40][middle dot]bipy (2), [Cu3(2-pytz)2(bipy)4(H2O)6][H4SiW12O40]2[middle dot]6H2O (3), [Cu2(2-pytz)(phen)(OH)]2[SiW12O40][middle dot]H2O (4), [Cu3(4-pytz)4(H2O)4][H2SiW12O40][middle dot]2H2O (5), were synthesized. When only 2-pytz was employed, compound 1 with a 3D framework was obtained, whereas when the secondary spacers (4,4[prime or minute]-bipy, phen and 4-pytz) were introduced into the reaction system of 1, compounds 2-5 were obtained and exhibit a broad range of structures, including 0D, 1D, 2D and 3D frameworks. It can be observed from the architectures of compounds 1-5 that the secondary spacers have a great effect on the structures of the MOFs, which results in the formation of various dimensional POMOF compounds. Additionally, photocatalytic experiments of 1-5 for the photocatalytic degradation of RhB under UV irradiation were also investigated.

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