Spectroscopic studies of borohydride derivatives of zirconium and hafnium

Abstract

The infrared (i.r.), proton and ¹¹B nuclear magnetic resonance (n.m.r.) spectra of zirconium and hafnium borohydrides have been investigated, together with the proton and ¹¹B n.m.r. spectra of dicyclopentadientyl zirconium diborohydride. The i.r. spectra indicate that the borohydride groups are bonded to the metal atom by bridging hydrogen atoms, but a rapid exchange process renders the bridge and terminal hydrogens indistinguishable in the n.m.r. spectra.