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A Novel Nickel(II)-Schiff Base Coordination Bridged Polysilsesquioxane: Preparation and Magnetic Properties

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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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Keywords: BRIDGED POLYSILSESQUIOXANES; COMPLEXES; MAGNETIC PROPERTY; SCHIFF BASE

Document Type: Research Article

Publication date: October 1, 2018

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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