Strong H...F hydrogen bonds as synthons in polymeric quantum magnets: structural, magnetic, and theoretical characterization of [Cu(HF2)(pyrazine)2]SbF6, [Cu2F(HF)(HF2)(pyrazine)4]... by Manson, J, Schlueter, J, Funk, K, Southerland, H, Twamley, B, Lancaster, T, Blundell, S, Baker, P, Pratt, F, Singleton, J, McDonald, R, Goddard, P, Sengupta, P, Batista, C, Ding, L, Lee, C, Whangbo, M, Franke, I, Cox, S, Baines, C, Trial, D