A New Structural Variation of Nb₃YX₇ Compounds: Monoclinic Nb₃SI₇

Monoclinic triniobium sulfide heptaiodide, m-Nb₃SI₇, was obtained by reaction of the elements in evacuated sealed fused silica tubes at 1105 K. The structure comprises [Nb₃SI₁₀]⁶⁻ clusters whose Nb triangles are bicapped by μ³-I and μ³-S. The clusters are linked by terminal I atoms to form dimeric units with a crystallographic center of symmetry. These dimeric units are cross-linked by the remaining terminal I atoms to form a novel two-dimensional structure.

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