Abstract

Exchange reactions occurred in the ion source of a mass spectrometer during direct solid probe analyses of samples of tetra (cyclopentadienyl) uranium (IV) [UCp₄, where Cp=C₅H₅, the cyclopentadieny lligand]. Tris(cyclopentadienyl) uranium (IV) fluoride, UCp₃F, was formed according to the reaction UCp₄ + MF → UCp₃F + MCp. This mass spectrometer exchange phenomenon is the first reported for an actinide organometallic compound, although mass spectrometer ion-source exchange reactions between lanthanide chelates and alkali metal chelates have been observed previously.

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