Citation: Yin, Ping; Zheng, Li-Min; Gao, Song; Xin, Xin-Quan (2001). Cu4{CH3C(OH)(PO3 )2}2(C4H4N2)(H2O)4: a novel, three-dimensional copper diphosphonate with metamagnetismElectronic supplementary information (ESI) available: views of structure 1, temperature dependence of ac magnetic susceptibility and field dependence of magnetization of 1. See http://www.rsc.org/suppdata/cc/b1/b106780j/. Chemical Communications, , pp. 2346-.