Acta Cryst. (2003). E59, m69-m71  [ doi:10.1107/S1600536802023024 ]

A potassium cryptate-2,2,2 salt of tricarbonyl(⁴-cyclopentadiene)manganese

L. Shao, S. J. Geib and N. J. Cooper

Abstract: Use of [Mn(⁴-C₆H₆)(CO)₃]^- prepared by anthracenide reduction of [Mn(⁶-C₆H₆)(CO)₃]PF₆ provides access to the title compound, (4,7,13,16,21,24-hexaoxa-1,l0-diazabicyclo[8.8.8]hexacosane)potassium tricarbonyl(cyclopentadiene)manganate(I), [K(C₁₈H₃₆N₂O₆)][Mn(C₅H₆)(CO)₃], by reaction of [Mn(⁴-C₆H₆)(CO)₃]^- with excess of the cyclopentadiene monomer (C₅H₆) at 195 K. In the title compound, there is octacoordination of potassium by two N and six O atoms of the 4,7,13,16,21,24-hexaoxa-1,l0-diazabicyclo[8.8.8]hexacosane and ⁴-coordination of the diene in an envelope conformation to the Mn(CO)₃^- center, with the methylene group folded out of the coordination plane.

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