title: Field-induced ferromagnetism and multiferroic behavior in end-on pseudohalide-bridged dinuclear copper(II) complexes with tridentate Schiff base blocking ligands.
abstract: Four new end-on pseudohalide-bridged dinuclear copper(II) complexes, [Cu2(L(1))2(N3)2]·DMF (1), [Cu2(L(2))2(N3)2] (2), [Cu2(L(3))2(NCS)2] (3), and [Cu2(L(4))2(N3)2] (4) {where HL(1), HL(2), HL(3), and HL(4) are tridentate N2O donor Schiff bases}, are synthesized and characterized. Complexes 1, 2, and 3 possess π···π stacking interactions, while in addition hydrogen-bonding interactions are present in 1 and 3. However, by contrast, complex 4 contains neither type of interaction. Field-induced long-range ferromagnetic ordering beyond 0.9 T is observed in complexes 1 and 2 due to π···π stacking interactions, while ferroelectric ordering is observed in complexes 1 and 3 due to hydrogen-bonding interactions. Most interestingly, complex 1, which contains both π···π stacking and hydrogen-bonding interactions, shows multiferroic behavior as a result of coupling between the dielectric and magnetic fields with 8% change in the magneto-dielectric effect at room temperature. We believe that from this study will emerge a new class of multiferroic materials.
authors.affiliation: Department of Chemistry, Inorganic Section, Jadavpur University , Kolkata - 700 032, India.
authors.forename: Subrata
authors.initials: S
authors.lastname: Jana
authors.forename: Bikash Kumar
authors.initials: BK
authors.lastname: Shaw
authors.forename: Prasanta
authors.initials: P
authors.lastname: Bhowmik
authors.forename: Klaus
authors.initials: K
authors.lastname: Harms
authors.forename: Michael G B
authors.initials: MG
authors.lastname: Drew
authors.forename: Shouvik
authors.initials: S
authors.lastname: Chattopadhyay
authors.forename: Shyamal Kumar
authors.initials: SK
authors.lastname: Saha