Abstract
The title compound, [(18-crown-6)K] + [W(η 5 -C 5 H 5 )(η 2 -Se 4 ) 2 ] - or [K(C 12 H 24 O 6 )][W(C 5 H 5 ))(Se 4 ) 2 ], consists of the anion [CpW(Se 4 ) 2 ] - (where Cp is cyclopentadienyl), which is linked to the [(18-crown-6)K] + cation via two potassium-selenium contacts of 3.457(5) and 3.527 (5) A. One of the WSe 4 rings adopts an envelope conformation, whereas the other WSe 4 ring lies between the standard envelope and half-chair conformations. The corresponding W-Se bond lengths lie in the range 2.441 (2)-2.570 (2) A, indicating asymmetry in the chelation of both Se4 ligands, which can also be seen from the Se-Se bond-length range of 2.300(4)-2.447 (3) A.
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