Polynuclear clusters of technetium. II. Physico‐chemical properties of bromide octanuclear prismatic and hexanuclear octahedral clusters of technetium

The thermal stability, IR‐ and ESR spectra, magnetic properties, electronic structure and the mechanism of the formation of the bromide octanuclear prismatic [Tc 8 Br 4 μBr 8 ]Br. 2 H 2 O ( I ); [H(H 2 O) 2 ][Tc 8 Br 4 μBr 8 ]Br ( II ), [H(H 2 O) 2 ] 2 [Tc 8 Br 4 μBr 8 ]Br 2 ( III ) and hexanuclear octahedral ([H 3 O(H 2 O) 3 ] 2 [Tc 6 Br 6 μ 3− Br 5 ] ( IV ); [C 4 H 9 ) 4 N] 2 [Tc 6 Br 6 μ 3 Br 5 ( V ); H 3 O(H 2 O) 3 ] 2 [Tc 6 Br 6 μ 3 Br 5 ]. 4 H 2 O ( VI )) clusters and also of hexabromotechnetium (IV) acid ((H 3 O) 2 [TcBr 6 ] ( VII ) have been studied. Synthesis, crystal and molecular structure of these compounds is described in the previous work [1]. It has been shown that compounds ( I )–( VI ) greatly differ in their physico‐chemical properties from the known clusters of other elements.