## Abstract

The Ln^{2+} complexes [K(2.2.2-cryptand)][Cp′_{3}Ln] (Ln = La, Ce, Pr, Nd, Sm, Eu, Dy, Tm, Yb; Cp′ = C_{5}H_{4}SiMe_{3}) were reacted with 1,3,5,7-cyclooctatetraene, C_{8}H_{8}, to determine if the reactivity of the complexes of 4f^{n+1} ions differed from that of 4f^{n}5d^{1} ions. Crystallographically characterizable (C_{8}H_{8})^{2-} complexes were obtained only for the larger metals in the lanthanide series, and two types of products were obtained: [K(2.2.2-cryptand)][Cp′_{2}Ln(C_{8}H_{8})] (Ln = La, Ce) and [K(2.2.2-cryptand)][Ln(C_{8}H_{8})_{2}] (Ln = Ce, Pr, Nd, Sm). The expected co-products of the two-electron reduction of C_{8}H_{8} by 2 equiv of [K(2.2.2-cryptand)][Cp′_{3}Ln], namely, the tetrakis(cyclopentadienyl) complexes, [K(2.2.2-cryptand)][Cp′_{4}Ln], were crystallographically characterized for six metals (Ln = Ce, Pr, Nd, Sm, Dy, Tm).

Original language | English (US) |
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Pages (from-to) | 3721-3728 |

Number of pages | 8 |

Journal | Organometallics |

Volume | 36 |

Issue number | 19 |

DOIs | |

State | Published - Oct 9 2017 |

### Bibliographical note

Funding Information:This research was supported by the National Science Foundation (NSF) under CHE-1565776 to W.J.E. We thank Dr. Jordan F. Corbey and Dr. Jason R. Jones for crystallographic assistance. We also thank NSF for providing graduate fellowship support for C.T.P. (DGE-1321846).