Cerium(III/IV) formamidinate chemistry, and a stable cerium(IV) diolate

  • Werner, Daniel
  • Deacon, Glen B.
  • Junk, Peter C.
  • Anwander, Reiner
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Publication date
January 2014
Publisher
Wiley

Abstract

Four new cerium(III) formamidinate complexes comprising [Ce(p-TolForm)(3)], [Ce(DFForm)(3)(thf)(2)], [Ce(DFForm)(3)], and [Ce(EtForm)(3)] were synthesized by protonolysis reactions using [Ce{N(SiMe3)(2)}(3)] and formamidines of varying functionality, namely N,N-bis(4-methylphenyl)formamidine (p-TolFormH), N,N-bis(2,6-difluorophenyl)formamidine (DFFormH), and the sterically more demanding N,N-bis(2,6-diethylphenyl)formamidine (EtFormH). The bimetallic cerium lithium complex [LiCe(DFForm)(4)] was synthesized by treating a mixture of [Ce{N(SiHMe2)(2)}(3)(thf)(2)] and [Li{N(SiHMe2)(2)}] with four equivalents of DFFormH in toluene. Oxidation of the trivalent cerium(III) formamidinate complexes by trityl chloride (Ph3CCl) caused dramatic color ch...

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