Novel polyselenides and polytellurides have been prepared by means of the stabilizing tris(trimethylsilyl)methyl group; [(Me3Si)3C]2Te3, the first compound containing a three tellurium atom chain, crystallizes as a trans-rotamer with a bonding angle of 103.8(1)" at the central tellurium atom and Te-Te bond distances of 2.710(1) A.

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The novel oxo-centred tetrahedral cobalt cluster [Co 4 O] 6+ bridged by six carbamato ligands is prepared in high yield when reacting [Co 2 (CO) 8 ] with an excess of the nitroxyl radical 2,2,6,6-tetramethylpiperidin-1-oxyl; the molecular structure of the title compound is determined by a singlecrystal X-ray analysis.