title: Nickel(II)-lanthanide(III) magnetic exchange coupling influencing single-molecule magnetic features in {Ni2 Ln2 } complexes.
abstract: Four isostructural [Ni2 Ln2 (CH3 CO2 )3 (HL)4 (H2 O)2 ](3+) (Ln(3+) =Dy (1), Tb (2), Ho (3) or Lu (4)) complexes and a dinuclear [NiGd(HL)2 (NO3 )3 ] (5) complex are reported (where HL=2-methoxy-6-[(E)-2'-hydroxymethyl-phenyliminomethyl]-phenolate). For compounds 1-3 and 5, the Ni(2+) ions are ferromagnetically coupled to the respective lanthanide ions. The ferromagnetic coupling in 1 suppresses the quantum tunnelling of magnetisation (QTM), resulting in a rare zero dc field Ni-Dy single-molecule magnet, with an anisotropy barrier Ueff of 19 K.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra, 400076 (India).
authors.forename: Naushad
authors.initials: N
authors.lastname: Ahmed
authors.forename: Chinmoy
authors.initials: C
authors.lastname: Das
authors.forename: Shefali
authors.initials: S
authors.lastname: Vaidya
authors.forename: Stuart K
authors.initials: SK
authors.lastname: Langley
authors.forename: Keith S
authors.initials: KS
authors.lastname: Murray
authors.forename: Maheswaran
authors.initials: M
authors.lastname: Shanmugam
keywords: X-ray diffraction; dysprosium; magnetism; nickel; single-molecule magnet