catena-Poly[[bis(nitrato-κ2O,O′)barium]-bis(μ-l-histidine-κ3O,O′:O]

In the polymeric title compound, [Ba(NO3)2(C6H9N3O2)2]n, the BaII atom is located on a crystallographic twofold axis and is coordinated by ten O atoms. Six are derived from two zwitterionic l-histidine molecules that simultaneously chelate one BaII atom and bridge to another. The remaining four O atoms are derived from two chelating nitrates. The molecules assemble to form a chain along [010]. In the crystal, chains are linked via N—H...O and N—H...N hydrogen bonds, generating a three-dimensional network

Bis(μ-l-arginine-κ3N2,O:O′)bis(l-arginine-κ2N2,O)tetra-μ-chlorido-tetrachloridotetracopper(II)

The title compound, [Cu4Cl8(C6H14N4O2)4], contains four molecules in the asymmetric unit. In the molecular structure, each of the four Cu2+ ions binds to three Cl atoms, one N atom and one O atom, resulting in distorted square-pyramidal coordination environments. The molecular structure is stabilized by weak C—H...O and N—H...Cl hydrogen bonds. The crystal structure exhibit weak intermolecular N—H...O, C—H...O and N—H...Cl interactions, generating a three-dimensional network