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We have used ab initio (HF/3-21G(*) and HF/6-31+G * ) single point energy calculations on model structures to investigate the nature of methyl C-H to anion interactions in tetramethylammonium tetrahydroborate. The preferred structure has four cations about the anion in a D 2d arrangement, each of which forms a CHHB dihydrogen bond to anion. This arrangement is in good accordance...