In the title compound, [(CH3)(2)(C7H7)NH][(C6F5)(3)B(OH)] or C9H14N+.C18HB1
5O-, the distorted tetrahedral borate anions are strongly hydrogen bonded t
o the substituted ammonium cations. The N . . . O separation in the N-H . .
. O hydrogen bond is 2.728 (3) Angstrom.