Ternary chalcogenides of rhenium and technetium containing isolated clusters

1 Ternary chalcogenides of rhenium and technetium containing isolated clusters 

To prepare the compounds RbioTe68i4, CsioTe68i4, RbioRe68i4, and CsioReeSn, a mixture of the alkali carbonate and rhenium or technetium in 5 1 molar ratio was in each case converted at 800 °C in a stream of hydrogen doped with sulfur. The duration of these reactions was between 10 and 16 h. The preparation of the technetium compoimds was performed in a radiochemical laboratory of the For-schungszentrum Julich. The Tc isotope used decomposes by emission. The compounds were obtained as black, lustrous crystals embedded in the partially solidified melt (Fig. 2). All four sulfides are unstable in air. 

2 Cs6Re6Si2 - a ternary rhenium chalcogenide with two-dimensionally linked clusters 

One-dimensionally linked Tce or Ree clusters have hitherto not been observed among the ternary chalcogenides discussed here (however, see Section 5.6.4). The compound Cs6Rc6Si2 is the only example so far of a two-dimensionally linked 

The determination of the structure was performed using single crystals. The two-dimensional linkages of the [ReeS ] structural units are depicted in Fig. 5 Fig. 6, 

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