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Reaction of TcO7 with (CH3)4Sn yields besides {(CH3)3SnOTcO3}n (5) also CH 3TcO3 (4) and [(CH3)2 TcO2]2 (3). 5 is not isomorphous with {(CH3)3SnOReO3}n (6), the trimethylstannyl perrhenate, though both compounds have a zickzack chaine structure. 5 is monoclinic (C2h 5-P21/c) with a = 961.6(9), b = 764.5(6), c = 1190.1(7) pm, β = 91.16(7)°, Z = 4, V = 874.71 × 106 pm3, drö = 2.48 g/cm3. While 6 possesses a crystallographic mirror plane 5 does not.

(4). Tc2(CO)10 has been photolyzed in the presence o f butadiene at - 20 °C in pentane. Under these conditions the only product which could be characterized is the complex [Tc2(CO)8][μ-C4H6] The X -ray structure determination shows that 1 is isomorphous with the homologues species [M2(CO)8][μ-C4H6] (M = Mn, Re) with the trans-butadiene ligand bridging the two technetium centers. 4 is compared to the manganese (5) and rhenium species (6 ).