Cyclopentadienyl, indenyl, and fluorenyl complexes of sodium with 15-crown-5

The sodium complexes [NaC5H5(15-crown-5)] (1a), [NaC9H7(15-crown-5)] (1b), and [NaC13H9(15-crown-5)] (1c, C5H5=cyclopentadienyl, C9H7=indenyl, C13H9=fluorenyl) were synthesized from NaC5H5, NaC9H7, NaC13H9, and 15-crown-5. Single crystal X-ray diffraction analyses were carried out for all three compounds 1a, 1b, 1c, and show that monomeric units were present in the solid state with the organic aromatic anion coordinated to the sodium cation via the five-membered ring.