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    Home > Southeast University undergraduate published the world's first case of nickel nitrite molecular ferroelectrics on angelw. Chem. Int. ed. by using the TOEFL effect

    Southeast University undergraduate published the world's first case of nickel nitrite molecular ferroelectrics on angelw. Chem. Int. ed. by using the TOEFL effect

    • Last Update: 2019-05-15
    • Source: Internet
    • Author: User
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    Recently, with the support of "top ten scientific and technological issues of Southeast University", the international molecular ferroelectric science and Application Research Institute (including the Key Laboratory of "molecular ferroelectric science and application" of Jiangsu Province) has advocated the design principles of "ball like non ball" and "TOEFL (fluorine) effect" In general, fluorine / hydrogen substitution can reduce the symmetry of crystal on the one hand, and adjust the phase transition point on the other hand As a supplement to the isotopic effect, the fluorine / hydrogen substitution design molecule ferroelectrics are called the torf effect Under the effect of the double torf effect, even the non ferroelectrics can be regulated as ferroelectrics Under the guidance of professor you Yumeng of Southeast University, the two molecular ferroelectrics were successfully used to synthesize perovskite molecular ferroelectrics based on nickel nitrite for the first time, which made important progress in the field of ferroelectrics The research results are entitled "the first nickel (II) - nitrite ‐ based molecular Perovskite Ferroelectric (the first perovskite molecular ferroelectric based on nickel nitrite)", and published in the international top journal of chemistry, angel Chem Int ed (DOI: 10.1002 / anie 201904305) The design of perovskite molecular ferroelectrics based on nickel nitrite (image source: angelw Chem Int ed.) is based on the theory of ball like non ball, hydrogen bond and fluoride effect As shown in the figure, ABX 3-type perovskite [(CH3) 4N] [Ni (NO2) 3] is hybridized from the non ferroelectric parent organic-inorganic system ]Based on the theory of sphere like non sphere, hydrogen bond and trifluoride effect, the cations were modified by chemical synthesis Finally, the highly symmetrical spherical cations [(CH3) 4N] + were modified to quasi spherical cations [fmetp] + Specifically, the introduction of large azabicycles greatly reduces the molecular symmetry, while the introduction of hydroxyl can provide hydrogen bond interaction, and the most electronegative F atom can replace H atom to further regulate crystal stacking Finally, based on the combination of ball like non ball, hydrogen bond function and trafluorination effect, the research team obtained the unprecedented organic-inorganic hybrid perovskite ferroelectrics based on nickel nitrite ([fmetp] [Ni (NO2) 3]) This creative work puts forward the basic principles of molecular design for molecular ferroelectrics, which is helpful to expand the family of molecular ferroelectrics and promote the development of molecular ferroelectrics Xiong Yu'an and Sha Taiting, undergraduates of the school of chemistry and chemical engineering of Southeast University, are the co authors of this paper, and you Yumeng and Xiong rengen are the co correspondents Other authors include Miao Shurong, Jing Zhengyin and Feng Zijie, undergraduates This is also one of the research achievements they have made in the competition of extracurricular academic and technological works of college students in the "Challenge Cup" This work was also completed with the joint efforts of Pan Qiang, the winner of the last "Challenge Cup" grand prize, and song Xianjiang, a doctoral student.
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