Crystal structure of heptaguanidinium nonahydrogen bis[α-hexamolybdoplatinate(IV)] heptahydrate
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چکیده
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, inter-polyanion 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 mol-ecule are equally disordered about a twofold rotation axis.
منابع مشابه
Redetermination of heptapotassium nonahydrogen bis[α-hexamolybdoplatinate(IV)] undecahydrate
Previously reported at a temperature of 298 (2) K [Lee & Joo (2007 ▶). Acta Cryst. E63, i11-i13], the title compound, K(7)[H(9)α-Pt(2)Mo(12)O(48)]·11H(2)O or K(7)[H(4.5)α-PtMo(6)O(24)](2)·11H(2)O, was redetermined at 146 (2) K in order to determine whether the H atom in the hydrogen bond that crosses the center of symmetry was located at the center of symmetry or disordered around it as assumed...
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