Crystal structure of heptaguanidinium nonahydrogen bis[α-hexamolybdoplatinate(IV)] heptahydrate

• Main Authors: Hea-Chung Joo, Ki-Min Park, Uk Lee
• Format: Article
• Language: English
• Published: International Union of Crystallography 2015-03-01
• Series: Acta Crystallographica Section E: Crystallographic Communications
• Subjects: crystal structure; platinum-containing heteropolyoxomolybdate; centrosymmetric hydrogen bond; strong hydrogen bond; Anderson-type heteropolyoxomolybdate
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S2056989015002601

The title compound, (CH6N3)7H9[PtMo6O24]2·7H2O, containing the well-known Anderson-type heteropolyoxomolybdate, was obtained by recrystallization of its powdered guanidinium salt. The protonated O atoms in the polyanion were confirmed by electron-density maps, interpolyanion hydrogen bonds and bond-valance sums (BVS). The {[H4.5PtMo6O24]2}7− polyanion is the same as that already characterized in K7[H4.5PtMo6O24]2·11H2O [space group P-1; Lee & Joo (2010). Acta Cryst. E66, i8–i9]. The heteropolyanions form inversion-generated dimers, {[H4.5PtMo6O24]2}7−, held together by each of the four μ3-O—H...μ1-O, two μ2-O—H...μ2-O hydrogen bonds and one centrosymmetric μ3-O—H—μ3-O hydrogen bond. The H atom of the centrosymmetric hydrogen bond is located on an inversion centre. One guanidinium ion and one water molecule are equally disordered about a twofold rotation axis.