Synthesis of tetrafluoro(η5-pentamethylcyclopentadienyl)tantalum(V) and X-ray crystal structure of its AsF3 solvate, [{Ta(η5-C5Me5)F4}2]·2AsF3

Abstract

The compound [Ta(η⁵-C₅Me₅)Cl₄](1) reacts with excess of AsF₃ to form the crystalline complex [{Ta(η⁵-C₅Me₅)F₄}₂]·2AsF₃(2) which has been investigated by single-crystal X-ray diffraction analysis. The AsF₃ can be removed in vacuo to give [Ta(η⁵-C₅Me₅)F₄](3). Compound (3) is soluble in common organic solvents, e.g. diethyl ether, toluene, or acetonitrile.