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BF 4 (py = pyridine): Evidence for spin exchange along strongly distorted F⋯H⋯F - bridges in a one-dimensional polymeric chain

Inorganic Chemistry 51:14 (2012) 7520-7528

Authors:

JL Manson, AG Baldwin, BL Scott, J Bendix, RE Del Sesto, PA Goddard, Y Kohama, HE Tran, S Ghannadzadeh, J Singleton, T Lancaster, JS Möller, SJ Blundell, FL Pratt, VS Zapf, J Kang, C Lee, MH Whangbo, C Baines

Abstract:

Figure Persented: [Ni(HF 2)(3-Clpy) 4]BF 4 (py = pyridine) is a simple one-dimensional (1D) coordination polymer composed of compressed NiN 4F 2 octahedra that form chains with bridging HF 2- ligands. In spite of significant distortion of the HF 2- bridge, a quasi-1D antiferromagnetic (AFM) behavior was observed with J FHF = 4.86 K. © 2012 American Chemical Society.
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[Ni(HF2)(3-Clpy)4]BF4 (py = pyridine): evidence for spin exchange along strongly distorted F···H···F- bridges in a one-dimensional polymeric chain.

Inorg Chem 51:14 (2012) 7520-7528

Authors:

Jamie L Manson, Adora G Baldwin, Brian L Scott, Jesper Bendix, Rico E Del Sesto, Paul A Goddard, Yoshimitsu Kohama, Hope E Tran, Saman Ghannadzadeh, John Singleton, Tom Lancaster, Johannes S Möller, Stephen J Blundell, Francis L Pratt, Vivien S Zapf, Jinhee Kang, Changhoon Lee, Myung-Hwan Whangbo, Christopher Baines

Abstract:

[Ni(HF(2))(3-Clpy)(4)]BF(4) (py = pyridine) is a simple one-dimensional (1D) coordination polymer composed of compressed NiN(4)F(2) octahedra that form chains with bridging HF(2)(-) ligands. In spite of significant distortion of the HF(2)(-) bridge, a quasi-1D antiferromagnetic (AFM) behavior was observed with J(FHF) = 4.86 K.
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Superconductivity in New Materials, Vol. 4, volume edited by Z. Fisk and H.R. Ott

Contemporary Physics Taylor & Francis 53:4 (2012) 394-395
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Influence of HF2- geometry on magnetic interactions elucidated from polymorphs of the metal-organic framework [Ni(HF2)(pyz)2]PF6 (pyz = pyrazine).

Dalton Trans 41:24 (2012) 7235-7243

Authors:

Jamie L Manson, Kimberly E Carreiro, Saul H Lapidus, Peter W Stephens, Paul A Goddard, Rico E Del Sesto, Jesper Bendix, Saman Ghannadzadeh, Isabel Franke, John Singleton, Tom Lancaster, Johannes S Möller, Peter J Baker, Francis L Pratt, Stephen J Blundell, Jinhee Kang, Changhoon Lee, Myung-Hwan Whangbo

Abstract:

A tetragonal polymorph of [Ni(HF(2))(pyz)(2)]PF(6) (designated β) is isomorphic to its SbF(6)-congener at 295 K and features linear Ni-FHF-Ni pillars. Enhancements in the spin exchange (J(FHF) = 7.7 K), Néel temperature (T(N) = 7 K), and critical field (B(c) = 24 T) were found relative to monoclinic α-PF(6). DFT reveals that the HF(2)(-) bridges are significantly better mediators of magnetic exchange than pyz (J(pyz)), where J(FHF) ≈ 3J(pyz), thus leading to quasi-1D behavior. Spin density resides on all atoms of the HF(2)(-) bridge whereas N-donor atoms of the pyz ring bear most of the density.
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Magnetism: A Very Short Introduction

Oxford University Press (OUP), 2012
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