Metallcarbonyl‐Synthesen, XX. Einfache Methode zur Darstellung von Tc(CO)3‐Komplexen: Synthese und Struktur der neuartigen Technetium(I)‐Clusterverbindung Na[Tc3(CO)9(OCH3)4] mit Cuban‐Struktur

Metal Carbonyl Syntheses, XX. – Simple Method for the Preparation of Tc(CO)3 Complexes: Synthesis, Structures, and Reactivity of the Novel Cubane‐Type Cluster Na[Tc3(CO)9(OCH3)4] Carbonyltechnetium complexes of type LTc(CO)3 are accessible along a simple route from Na[Tc3(CO)9(OCH3)4] (2) which represents a novel alkoxy complex of cubane‐type geometry (single‐crystal X‐ray diffraction study). 2 is an isolable product of the incomplete carbonylation of sodium pertechnetate (1) conducted in methanol. Under carbon monoxide pressure, 2 yields the binary metal carbonyl Tc2(CO)10 (3), pentamethyl‐cyclopentadiene gives the halfsandwich complex (η5‐C5Me5)Tc(CO)3 (4), and with benzene/hydrochloric acid the ionic complex [(η6‐C6H6)Tc(CO)3]Cl (5) is formed.