A Novel Nickel(II)-Schiff Base Coordination Bridged Polysilsesquioxane: Preparation and Magnetic Properties
In this paper, novel precursors with Schiff base bridging group were synthesized, and utilized to prepare magnetic nickel-complex-bridged polysilsesquioxanes (2,2'-PSBBS-Ni, 4,4'-PSBBS-Ni) through a sol–gel procedure under acidic, nickel(II) ions conditions. The 1HNMR, FTIR, and mass spectrometer results verified that precursors with Schiff base bridging group were successfully prepared, and the organic and inorganic parts of these two complexes (2,2'-PSBBS-Ni, 4,4'-PSBBS-Ni) were connected on a molecular level. The SEM images of 2,2'-PSBBS-Ni, 4,4'-PSBBS-Ni showed both of these hybrid materials were spherical microstructures with uniform size about 1–2 μm. The TGA results showed that the thermal stability of 2,2'-PSBBS-Ni and 4,4'-PSBBS-Ni were improved, which was attributed to the coordination of metal ion Ni(II) through the nitrogen atom of the Schiff base and the oxygen atom of the C–O bond, imparting greater rigidity in the structure. The magnetic measurement results indicated that 2,2'-PSBBS-Ni exhibited features of hard ferromagnetism with high coercive field (1820 Oe) at low temperature. Whereas, the 4,4'-PSBBS-Ni presented behavior characteristic of soft ferromagnetism with low coercive field (36 Oe). Furthermore, the 4,4'-PSBBS-Ni displayed magnetic transition behavior with transition temperature 70 K. These novel magnetic nickel-complex-bridged polysilsesquioxanes were expected to find potential application in fabricating the complexes with desired physicochemical or biological properties.
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Document Type: Research Article
Publication date: October 1, 2018
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