2-Methyl­imidazolium tetra­hydroxohexa­oxopenta­borate.

A new organic penta­borate, C4H7N2+·B5O6(OH)4−, has been synthesized under hydro­thermal conditions. Its crystal structure is composed of isolated penta­borate anions and 2-methyl­imidazolium counter-cations. The B5O6(OH)4− units are connected to one another through hydrogen bonds, forming a three-dimensional framework with large channels along the c axis, in which the cations are located. [ABSTRACT FROM AUTHOR]