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The bonding and conformational characteristics of bissulfonylamides and analogous imides are compared. Structures (44 altogether) containing R--SO2--NQ--SO2--R' units were retrieved from the Cambridge Structural Database. i.e. the size and the shape of the SvI [o,O',N,C] tetrahedra, are principally governed by the environment of the N atoms. The conformation symmetry and dissymmetry of the charged and neutral --SO2--NQ--SO 2-moieties are described in terms of the internal rotations about the bonds in the R--S--N--S--R' fragment.