Nickel(II)-Lanthanide(III) Magnetic Exchange Coupling Influencing Single-Molecule Magnetic Features in {Ni2Ln2} Complexes.

Authors :: Ahmed, Naushad
Das, Chinmoy
Vaidya, Shefali
Langley, Stuart K.
Murray, Keith S.
Shanmugam, Maheswaran
Source :: Chemistry - A European Journal; Oct2014, Vol. 20 Issue 44, p14235-14239, 5p
Publication Year :: 2014
Abstract: Four isostructural [Ni<subscript>2</subscript>Ln<subscript>2</subscript>(CH<subscript>3</subscript>CO<subscript>2</subscript>)<subscript>3</subscript>(HL)<subscript>4</subscript>(H<subscript>2</subscript>O)<subscript>2</subscript>]<superscript>3+</superscript>(Ln<superscript>3+</superscript>=Dy ( 1), Tb ( 2), Ho ( 3) or Lu ( 4)) complexes and a dinuclear [NiGd(HL)<subscript>2</subscript>(NO<subscript>3</subscript>)<subscript>3</subscript>] ( 5) complex are reported (where HL=2-methoxy-6-[( E)-2′-hydroxymethyl-phenyliminomethyl]-phenolate). For compounds 1- 3 and 5, the Ni<superscript>2+</superscript> 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 U<subscript>eff</subscript> of 19 K. [ABSTRACT FROM AUTHOR]

Subjects :: NICKEL
RARE earth metals
SINGLE molecule magnets
MAGNETIC coupling
FERROMAGNETISM

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