Abstract
By rational combining the photochromic nature of azo moiety and pyridine radicals, two photochromic MOFs, namely [M(H2O) (azpy)0.5 (mal)]·0.25azpy (M = Zn for 1 and Mn for 2, azpy = azopyridine, H2mal = malonic acid) have been constructed. MOFs 1 and 2 exhibit 3D porous frameworks with ins topology. Both of the compounds features trans-cis isomerization of the azpy molecule as well as the formation of pyridine based radicals with irradiation triggered electron transfer, which is proved by single-crystal X-ray diffraction, powder X-ray diffraction, FT-IR, UV–vis spectra, XPS and EPR characterizations. Furthermore, Magnetic measurements shows that there is antiferromagnetic interaction in MOFs 2.
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