Characterization of Ge5R4 (R = CH(SiMe3)2, C6H3-2,6-Mes2): Germanium Clusters of a New Structural Type with Singlet Biradical Character
摘要:
Reduction of the bulky organogermanium(II) halides Ge(Cl){CH(SiMe3)(2)} and Ge(Cl)C6H3-2,6-Mes(2) (the former in the presence of GeCl2.(dioxane)) afforded the clusters Ge5R4 (R = CH(SiMe3)(2) (1), C6H3-2,6-Mes(2) (2)), which have an unsubstituted germanium atom capping a butterfly Ge4R4 array. The bonding involves six two-center-two-electron Ge-Ge bonds and a lone pair at the unsubstituted germanium as well as nonbonded electron density at two of the substituted germaniums that indicates possible biradical character.