Crystal Structure of Lanthanum Potassium
Octacyanomolybdate(IV) Nonahydrate

I. V. Typilo1, O. A. Sereda1, H. Stoeckli-Evans2,
R. E. Gladyshevskii
3, and D. I. Semenyshyn1, *

1 National University “Lvovskaya Politekhnika”, Lviv, Ukraine

2 Institute of Microtechnique, Neuchatel University, Neuchatel, Switzerland

3 Franko National University, Kirila i Mefodiya 6, Lviv, 290005 Ukraine


Received April 13, 2009

Abstract—The crystal structure of KLaMo(CN)8 · 9H2O was determined from X-ray diffraction data. The
crystals are monoclinic, space group P21/c, a = 8.7451(4), b = 25.2761(13), c = 10.6744(5) Å, =117.059(3)frame0,
= 2101.22(17) Å3, Z = 4, calcd) = 2.037 g/cm3, R = 0.0242, wR2 = 0.0500 for 5656 independent reflections.
The coordination polyhedra of the Mo, La, and K atoms are the tetragonal antiprism [Mo(CN)8], the mono-
capped tetragonal antiprism [La(NC)4(OH2)5], and the strongly distorted monocapped trigonal prism
[K(NC)3(OH2)4], respectively. The La and K atoms are N-linked by seven bridging cyano groups to form double
layers with two sandwiched uncoordinated water molecules and the sandwiched terminal CN group. The com-
plex can be formulated as {[K(H2O)2][La(H2O)5][Mo(CN)8]}n · 2nH2O.

DOI: 10.1134/S1070328409120112

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