Bis(cyclopentadienyl)technetium(III)chlorid und Tris(cyclopentadienyl)technetium(III), neue metallorganische Verbindungen des dreiwertigen Technetiums

Abstract

Abstract Technetium tetrachloride reacts with potassium cyclopentadienide in tetrahydrofuran to give the diamagnetic, air-stable (C 5 H 5 ) 2 TcCl ( 1 ). Single crystal X-ray diffraction analysis shows a short ring-metal distance of 187.7(5) pm, which is comparable with the corresponding distance in nickelocene, indicating high covalency. Reaction of the compound with KC 5 H 5 gives the red (C 5 H 5 ) 3 Tc ( 4 ), in which one cyclopentadienyl ring is σ-bonded. Mass spectroscopic investigations of the latter compound give evidence for the existence of (C 5 H 5 ) 4 Tc. The reactivity of (C 5 H 5 ) 2 TcCl is discussed.