摘要:
Derivatives of BrH10, in which a R3M group {M = Sn, R = Ph (I), Me (II)} replaces a bridging hydrogen atom, have been prepared and characterized by NMR spectroscopy. The bridging H atoms, in the 2,3-mu-(R3M)-B6H9 species, are fluxional on both the boron-11 and proton NMR time scale, but the motion appears to be partially quenched as observed for other 2,3-mu-metalla derivatives of hexaboranes. At temperatures above about -10-degrees-C some simple motion of the cage relative to the R3Sn group is invoked to account for the spectra Of I. 2,3-mu-(Me3Sn)B6H9 is unstable and could not be isolated or handled at temperatures above ca. -20-degrees-C.