Crystal Structures of Cesium and Dimethylammonium
Cupradecaborates, Cs[CuB₁₀H₁₀] and (CH₃)₂NH₂[CuB₁₀H₁₀]

I. N. Polyakova, E. A. Malinina, and N. T. Kuznetsov

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninski pr. 31, Moscow, 119991 Russia

e-mail: sokol@igic.ras.ru

Received February 20, 2002

Abstract—The crystal structures of Cs[CuB₁₀H₁₀] (I) and (CH₃)₂NH₂[CuB₁₀H₁₀] (II) are studied (R = 0.0398
and 0.0510 for 1225 and 2728 observed reflections in I and II, respectively). Crystals I and II are built of
[(CuB₁₀H₁₀)] anionic chains and cations. The distorted tetrahedral coordination of the Cu⁺ ions is formed by
four pairs of B–H atoms from two polyhedral anions. The Cu–B bond lengths in I and II are 2.159–2.287(6)
and 2.130–2.285(9) Å, respectively. The coordination of the Cu⁺ ions in II includes only edges between apical
and equatorial vertices of the anions. In I, both the edges of the apical belt and those between two equatorial
vertices are involved in coordination. The ability of the B₁₀ anion to coordinate metals by the equatorial
edge is established for the first time. © 2003 MAIK “Nauka/Interperiodica”.

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