ChemInform Abstract: Crystal Structure of Potassium Samarium Octacyanomolybdate(IV) Decahydrate.

Abstract

Structure D 2000 Crystal Structure of Potassium Samarium Octacyanomolybdate(IV) Decahydrate. -Orange single crystals of the title compound are prepared by reaction of K2CO3 and Sm2(CO3)3 in 0.1M H4[Mo(CN)8]·2H2O in the dark (room temp., several months). KSm[Mo(CN)8]·10H2O crystallizes in the orthorhombic space group Pbcm with Z = 4. The structure contains [SmN4(H2O)5] 3+ and [Mo(CN)8] 4units, K + cations, and additional water molecules. -(TYPILO, I.; SEREDA, O.; SEMENYSHYN*, D.; STOECKLI-EVANS, H.; GLADYSHEVSKII, R.; Pol. J. Chem. 83 (2009) 2, 339-344; Inst. Chem. Chem. Eng., Lviv Polytech. Natl. Univ., Lviv 79013, Ukraine; Eng.) -Schramke 18-009

Investigation of the crystal structures of new cyano-bridged compounds with KLaMo(CN)8·9H2O structure type

“…The compounds I and II have similar structures and are isostructural to KLaMo(CN) 8 •9H 2 O [7], but differ substantially from the structures of other octacyano complexes of molybdenum and tungsten(V,IV) [3][4][5][6][7][8][9][10][11][12][13] [3], Sm [6]), which belong to the space group P4/ncc. The water molecules in all these compounds are included in the coordination sphere of the lanthanide ions.…”

“…The water molecules in all these compounds are included in the coordination sphere of the lanthanide ions. It is 22.09 32.884 7161(7) O3-H32...O5 0.82 22.02 32.798 7159 7O7-H72...O9 0.81 22.05 42.820 (8) 159(9) O7-H71...O2 0.82 21.95 32.754 7170(9) O6-H61...N2 0.82 22.24 42.979 (6) 152(6) O6-H62…O8 0.81 22.56 73.062 7121 7 (8) interesting to note that in the complexes formed by elements of the cerium subgroup, the coordination polyhedron of the Ln atom consists of nine atoms, [LnN 4 O 5 ], and can be described as a slightly deformed monocapped square antiprism, whereas in the complexes of rare-earths of the yttrium subgroup the coordination polyhedron of Ln atoms is an eightvertex [LnN 4 O 4 ] slightly distorted square antiprism [3]. Crystallization water molecules are absent in this complexes.…”

“…The complexes I, II and KLaMo(CN) 8 •9H 2 O differ from other cyano complexes of Mo(IV), W(IV) by the higher number of water molecules, which results in a considerably different structure [8][9][10][11][12][13]. In these compounds, the coordination polyhedra of the Mo and W atoms are slightly different.…”

Regularities in the Crystal Structures of Heterocationic Octacyanometallates(IV) Molybdenum and Tungsten

“…The synthesis of cyano complexes of molybdenum and tungsten, investigation of their crystal structures were reported in works [3][4][5][6][7][8][9][10] 8 ] with lanthanide carbonates or chlorides in the aqueous solution. The solutions were stored in dark at room temperature after their mixing.…”

“…Thus, the complex [Sm(H 2 O)5 ][W(CN)8 ] belongs to a tetragonal symmetry. Ion samarium in the complex is surrounded by four nitrogen ions of cyanogroups and five oxygen ions of water molecules on the monocapped square antiprism tops.…”