Synthesis And Xrd Study Of An C-2-Linked Bis(Quaternary Ammonium) Pentaborate: [Me3nch2ch2nme3][B5o6(Oh)(4)](2)

The synthesis and characterization of a C-2 (ethane) linked bis(trimethylammonium) pentaborate salt, [Me3NCH2CH2NMe3][B5O6(OH)(4)](2) (1), is reported . Compound 1 has been characterized by H-1, B-11, and C-13 NMR Spectroscopy, IR spectroscopy, thermal (TGA/DSC) analysis, and single-crystal X-ray diffraction. There are two independent crystallographic pentaborate(1-) anions in the solid-state structure and these link by H-bonds at beta-sites into a centrosymmetric tetrameric chain. These chains are crossed-linked by R-2(2)(8) H-bond motifs to alpha-sites of neighboring pentaborate tetrameric units. The [Me3NCH2CH2NMe3](2+) cations are located between these tetrameric pentaborate(1-) units.[GRAPHICS].