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Ionic Ferroelectrics Based on Nickel Schiff Base Complexes

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journal contribution
posted on 15.02.2010 by Yan Sui, Dong-Ping Li, Cheng-Hui Li, Xin-Hui Zhou, Tao Wu, Xiao-Zeng You
Two novel homochiral enantiomers, trinuclear ionic clusters [(NiL1)2Na]+NCS·MeOH·Et2O (1) and [(NiL2)2Na]+NCS·MeOH·Et2O (2) [H2L1 = N,N′-bis(3-methoxysalicylidene)-(1R,2R)-1,2-diphenylenediamine; H2L2 = N,N′-bis(3-methoxysalicylidene)-(1S,2S)-1,2-diphenylenediamine], have been synthesized and structurally characterized. Both complexes have C2 symmetry and crystallize in space group P21. Ferroelectric measurements reveal that complexes 1 and 2 represent a new type of ionic ferroelectric based on metal−organic coordination with a polarization value higher than that of KH2PO4.