The pentacoordinated [Cr(CO)5]2− dianion in [2,2,2‐crypt‐K]2[Cr(CO)5] ethylenediamine monosolvate |
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Authors: | Jun Zhai Li Xu |
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Abstract: | Bis[(4,7,13,16,21,24‐hexaoxa‐1,10‐diazabicyclo[8.8.8]hexacosane)potassium(+)] pentacarbonylchromate(2−) ethylenediamine monosolvate, [K(C18H36N2O6)]2[Cr(CO)5]·C2H8N2, was obtained from the reaction between K3Cd2Sb2 and Cr(CO)6 in ethylenediamine in the presence of the macrocyclic 2,2,2‐crypt ligand. The structure provides the first crystallographic characterization of the pentacoordinated [Cr(CO)5]2− dianion. The central CrIII atom is coordinated by five carbonyl ligands in a distorted trigonal–bipyramidal geometry. The distribution of the Cr—C bond lengths indicates a greater degree of back bonding from CrIII to the equatorial carbonyl ligands compared with the axial carbonyl ligands. |
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