Effects of volumetric expansion in molecular crystals: A quantum mechanical investigation on aspirin and paracetamol most stable polymorphs

Relative anisotropic expansion of lattice parameters of (a) aspirin and (b) paracetamol crystals and that of (c) OH⋯O and CH⋯O bonds in aspirin crystal and (d) NH⋯O and OH⋯O bonds in paracetamol crystal. Lattice parameters and hydrogen bond lengths are compared with respect to those at unconstrained cell-volume (V0).