Platonic Relationships in Metal Phosphonate Chemistry: Ionic Metal Phosphonates Xanthopoulos, Konstantinos Anagnostou, Zafeiria Chalkiadakis, Sophocles Choquesillo Lazarte, Duane Mezei, Gellert Zareba, Jan K. Zon, Jerzy Demadis, Konstantinos D. metal phosphonate ionic compounds phosphonic acids organic salts Phosphonate ligands demonstrate strong affnity for metal ions. However, there are several cases where the phosphonate is found non-coordinated to the metal ion. Such compounds could be characterized as salts, since the interactions involved are ionic and hydrogen bonding. In this paper we explore a number of such examples, using divalent metal ions (Mg2+, Ca2+, Sr2+ and Ni2+) and the phosphonic acids: p-aminobenzylphosphonic acid (H2PABPA), tetramethylenediamine-tetrakis(methylenephosphonic acid) (H8TDTMP), and 1,2-ethylenediphosphonic acid (H4EDPA). The compounds isolated and structurally characterized are [Mg(H2O)6] [HPABPA]2 6H2O, [Ca(H2O)8] [HPABPA]2, [Sr(H2O)8] [HPABPA]2, [Mg(H2O)6] [H6TDTMP], and [Ni(H2O)6] [H2EDPA] H2O. Also, the coordination polymer {[Ni(4,4’-bpy)(H2O)4] [H2EDPA] H2O}n was synthesized and characterized, which contains a bridging 4,4’-bipyridine (4,4’-bpy) ligand forming an infinite chain with the Ni2+ cations. All these compounds contain the phosphonate anion as the counterion to charge balance the cationic charge originating from the metal cation. 2019-10-15T11:29:05Z 2019-10-15T11:29:05Z 2019-06-11 info:eu-repo/semantics/article Xanthopoulos, K., Anagnostou, Z., Chalkiadakis, S., Choquesillo-Lazarte, D., Mezei, G., Zaręba, J. K., ... & Demadis, K. D. (2019). Platonic Relationships in Metal Phosphonate Chemistry: Ionic Metal Phosphonates. Crystals, 9(6), 301. http://hdl.handle.net/10481/57364 10.3390/cryst9060301 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Crystals