Packing polymorphism in the structure of trans-aqua-[N,N'-bis-(salicyl-idene)ethane-1,2-di-amine-κ4 O,N,N',O']chlorido-manganese(III) monohydrate.

The crystal structure of the title complex (systematic name: trans-aqua-chlorido-{2,2'[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolato-κ4 O,N,N',O'}manganese(III) monohydrate), [Mn(C16H14N2O2)Cl(H2O)]·H2O has been reported previously in the space group P21/n [Panja et al. (2003 ▸). Polyhedron, 22, 1191-1198]. We obtained the same hydrated complex through an alternative synthesis, and crystallized a new polymorph, in the space group P21. The mol-ecular conformation of the complex is virtually unmodified, but the absence of the glide plane in the new polymorph halves the unit-cell parameter c, affording a non-centrosymmetric crystal structure with Z = 2, while the previously reported crystal is centrosymmetric with Z = 4. Both phases represent a case of packing polymorphism, similar to other dimorphic crystal structures retrieved from the Cambridge Structural Database.