Homochiral cobalt(II) and strontium(II) amino-carboxylate–phosphonate hybrids

Two homochiral metal amino-carboxylate–phosphonate hybrids, namely, [Co2Cl(S-HL)(H2O)5]Cl · H2O 1 and Sr2(S-HL)(NO3)2(H2O) · H2O 2 (S-H3L = S-HO2CC4H7NCH2PO3H2) have been synthesized by the reaction of the enantiopure S-H3L ligand with cobalt(II) chloride or strontium nitrate under acidic condition at room temperature. The structure of compound 1 features a novel 3D framework with helical chains and channels. Compound 2 has a layered structure in which the 1D chains of edge-sharing SrO8 and SrO9 polyhedra are interconnected by phosphonate ligands.