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Na 2 [M 2 (CO) 10 ] and GeCl 4  react to give the compounds [(CO) 5 MGeCl 3 ] -  , 1a - 1c (M = Cr, Mo, W). From M(CO) 5 ·THF and Gel 2  in the presence of I -  compounds [(CO) 5 MGeI 3 ] - , 2a - 2c (M = Cr, Mo, W) are obtained. Compounds 2a and 2c react with alkoholates or thiolates to produce the cage compounds [{(CO ) 5 Cr} 6 Ge 6 (μ 2 -OH ) 2 (μ 3 - O) 6 ] 2- , 3, [{(CO) 5 Cr} 6 Ge 6  - (μ 2 -OEt) 2 (μ 2 -O) 4 (μ 3 -O) 2 ] 2-  , 4, and [{(CO) 5 W } 6 Ge 6 (OR) 2 (μ 2 - O) 2 (μ 3 -O) 4 ] 2-  , 5. A structural pattern common to all these compounds is an idealised octahedral arrangement of six germanium atoms. Each of these six germanium atoms binds to an M(CO) 5  protective group. The germanium atoms are integrated in the core of the cage compounds by μ 3 -O , μ 2 -O and μ 2 -OH bridges. The co-ordination number of germanium is generally four, with one bond radiating to the external M(CO) 5  building block. In compounds 3 and 4 the remaining three germanium bonds radiate to the bridging groups within the cage. Compounds 5 contain two germanium centres which are linked to the cage by only two bonds and with the two remaining bonds to the external M(CO) 5  entity and to a terminal OR or SR group. Syntheses and structures of compounds 1 - 5 are described.

zeitschrift für naturforschung b

Synthese und Struktur oxoverbrückter, M(CO) 5  geschützter Hexa-Germanium-Käfigverbindungen /Synthesis and Structure of Oxo-Bridged, M (CO) 5  Protected Hexagermanium Cage Compounds