Structures from MnX 2 and proline: isomorphous racemic compounds and a series of chiral non-isomorphous chain polymers

Reactions of manganese(II) chloride, bromide and iodide with proline as an enantiopure and racemic ligand result in six crystalline solids for which diffraction experiments have been performed at 100 K. For two of these compounds, crystal structures at ambient temperature had been reported previously. The most surprising outcome of our systematic comparison lies in the role of chirality: with enantiopure proline three different coordination polymers have been obtained, whereas racemic proline yields isomorphous mononuclear complexes under the same reaction conditions.

[rac-2-(1-Amino-eth-yl)phenyl-κC,N](ethyl-endiamine-κN,N')palladium(II) 3,5-dimethyl-benzoate

In the title compound, [Pd(C(8)H(10)N)(C(2)H(8)N(2))](C(9)H(9)O(2)), the palladium ion is coordinated in a distorted square-planar fashion by the two N atoms from the chelating ethyl-enediamine group and by the N and a C atom of the deprotonated chiral amine. The resulting cationic complex and the 3,5-dimethyl-benzoate anion are inter-connected by N-H⋯O hydrogen bonds.