(Pyrazole-kappa N-2)[N-salicylidene-kappa O-(S)-alaninato-kappa N-2,O]copper(II) dihydrate and (pyrazole-kappa N-2)[N-salicylidene-kappa O-(R,S)-alaninato-kappa N-2,O]copper(II) pyrazole solvate

In both {N-[(2-hydroxyphenyl)methylene]-(S)-alaninato-O,N,O'}(pyrazole-N-2)copper(II) dihydrate, [Cu(C10H9NO3)(C3H4N2)].2H(2)O, (I), and {N-[(2-hydroxyphenyl)methylene]-(R,S)-alaninato-O,N,O'}(pyrazole-N-2)copper(II) pyrazole solvate, [Cu(C10H9NO3)(C3H4N2)].C3H4N2, (II), the Cu-II ion adopts a similar axially distorted square-pyramidal coordination, The basal plane is formed by the tridentate Schiff base N-salicylidenealaninato dianion (TSB2-) and the pyrazole ligand, The apex of the pyramid is occupied by a carboxylic O atom from the neighbouring chelate, The cooperative ordering and the apical distance [2.978 (3) Angstrom in (I) compared with 2.366 (3) Angstrom in (II)] are the two main differences between the two complexes, The slacked Cu(TSB) complexes within (I) form polymeric chains by translation parallel to [100]. The apically bridged Cu(TSB) complexes of (II) form zigzag chains parallel to [010] via the 2(1) operator. The influence of the configuration at the chiral C atoms as well as the effect of uncoordinated water and pyrazole molecules on the cooperative ordering are discussed.