| Abstract: | Organometallic tungsten selenido complexes of the type cpW(CO)3]2Sem; m = 2 (1), 3 (2), 4 (3), can be easily synthesized via insertion of selenium into the alkali-metal tungsten bond of LiWcp(CO)3 in appropriate ratios and subsequent oxidation of the produced W-selenolates with O2/SiO2. In contrast, reactions of K2Se6 with cpW(CO)3Cl] and 18-crown-6 in DMF lead to a mixture óf cpW(CO)3]2Se4 (3), the η1 Se-bonded selenocarbamato complex cpW(CO)3SeC(O)NMe2] (4) and the ionic complex (18-crown-6)K]+cpW(Se4)2]? (5). The crystal structures of 3 and 4 together with their 77Se NMR data are presented. |
