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{MnIII2LnIII2} (Ln = Gd, La or Y) butterfly complexes: Ferromagnetic exchange observed between bis-μ-alkoxo bridged manganese(III) ions

Vignesh, KR and Martin, R and Miller, G and Rajaraman, G and Murray, KS and Langley, SK (2019) {MnIII2LnIII2} (Ln = Gd, La or Y) butterfly complexes: Ferromagnetic exchange observed between bis-μ-alkoxo bridged manganese(III) ions. Polyhedron, 170. pp. 508-514. ISSN 0277-5387

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Abstract

© 2019 Elsevier Ltd Three tetranuclear {MnIII2LnIII2} ‘butterfly’ complexes with common MnIII2 µ3-alkoxo bridging motifs surrounded by two LnIII ions (Ln = Gd, La or Y) have been studied by structural, magnetic and density functional theoretical calculations. The exchange coupling constant between the body–body Mn(III) ions is ferromagnetic in all cases, the La and Y examples being diamagnetic at the wing-wing positions. The wing-body Jwb (Mn–Gd) interaction is small and negative. Reasons are given for these JMnMn values, including the effects of the terminal LnIII ions, comparison to analogous Mn2 dinuclears, and the effects of spin polarisation.

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