Abstract
Biguanidium tris(biguanide-kappa(2)N(2),N(4))manganese(IV) hexanitrate, (C(2)H(9)N(5))[Mn(C(2)H(7)N(5))(3)](NO(3))(6), is a cocrystal of the [Mn(IV)(C(2)H(7)N(5))(3)](4+) ion and biguanidium. The cocrystal exhibits a double hydrogen-bonding interaction between the biguanide and nitrate groups, which is rarely observed in crystal structures but is proposed as a recognition mode for guanidinium-recognizing anionic groups in biological systems. In this cocrystal structure, biguanide moieties exist both as divalent cations and as neutral molecules.
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More From: Acta crystallographica. Section C, Crystal structure communications
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