The structure of di(2-Methylbenzotriazole) sulphate, (C7N3H9)2SO4, has been solved by X-ray diffraction methods. The compound crystallises in triclinic space group P$$bar 1$$witha=6.986(1),b=18.914(1),c=6.990(1) Å, α=95.083 (1), β=115.56 (1) and γ=84.93(1)o, respectively.Mr=362.36,F(000)=380,Z=2,Dm=1.45 mg m−3, finalR=0.060,Rw=0.064. The structure was solved by direct methods (SHELXS86) and refined by least-squares methods. Dimers of planar 2-Methylbenzotriazole (MBT) molecules form stacks, one along thea-axis and the other parallel to thec-axis. The SO4−2ions are confined by the two sets of stacks and are responsible for holding them together. The structure is mainly stabilized by the stacking forces. The average interplanar distances in any stack are 3.281 Å, within a dimer, and 3.361 Å, between t
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