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.

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 Ba^II 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 Ba^II 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.