Synthesis and Solid State ¹¹B-{¹H} Mas Nmr Investigations of some Group 11 arachno-2-Metallatetraboranes

Abstract

The preparation and characterization (melting point, solution ¹¹B-{¹H} NMR, IR) of some new 2-arachno-argentatetraboranes and 2-arachno-cupratetraboranes, [2-{(R₃P)₂M}B₃H₈] {M = Ag, R = 2-MeC₆H₄, 4-CIC₆H₄, 4-MeOC₆H₄, 2,6-(MeO)₂C₆H₃; M = Cu, R = 4-CIC₆H₄, 2,6-(MeO)₂C₆H₃} are reported and their solid state ¹¹B MAS (Magic Angle Spinning) NMR spectra are compared with those obtained from the previously known metallatetraboranes {M = Ag, R = Ph, 4-MeC₆H₄; M = Cu, R = Ph} and [NMe₄][2-{M(CO)₄}B₃H₈] (M = Cr, W). In contrast to the Cr and W derivatives, the Ag and Cu clusters exhibit only one signal in their solid state ¹¹B spectra consistent with an intramolecular boron exchange process which occurs in the solid state. Solid state ¹¹B MAS NMR spectra of Cs[B₃H₈] and [NMe⁴][B₃H₈] are also reported.

Referee I: H. Beall

Referee II: L. Barton

Notes

Referee I: H. Beall

Referee II: L. Barton

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