A new copper(II) basic sulfate: poly[3-amino­pyridinium μ₃-hydroxido-di-μ₃-sulfato-bis­[aqua­copper(II)]]

The crystal structure of the title basic copper(II) sulfate, {(C₅H₇N₂)[Cu₂(OH)(SO₄)₂(H₂O)₂]}_n, shows an unprecedented structural arrangement of two distinct copper centres. CuO₆ and CuO₅ polyhedra are linked through bridging hydroxide and sulfate anions to form negatively charged infinite chains propagated along the a axis. The negative charge is balanced by 3-amino­pyridinium cations that are held in the structure by extensive hydrogen bonding to the inorganic chains. Additionally, the cationic arrangement features π–π stacking.