<p>Reaction of Cu(NO₃)₂·3H₂O, disodium succinate (suc) and pyrazine (pyz) in a 2:2:1 mole ratio under hydrothermal conditions provides the coordination polymer [Cu(suc)(pyz)_0.5]_n. Elemental analysis confirmed the composition of the compound. The structure of [Cu(suc)(pyz)_0.5]_n has been determined by single-crystal X-ray crystallographic studies. In this polymer, each Cu²⁺ center is equatorially coordinated to four succinate O-atoms and the pyrazine N-atom occupies the apical position. The structure reveals the formation of two-dimensional square grids of the succinate-bridged paddle-wheel {Cu₂(μ-suc)₄} units. The paddle-wheel units of the parallel square grids are further connected by the pyrazine molecules to form an α-Po-type network, two of which form an interpenetrating framework structure. Physical characteristics are consistent with the structure, composition and phase purity of the compound. The Brunauer–Emmett–Teller analysis of N₂ adsorption–desorption measurements revealed a non-porous behavior of this coordination polymer.</p> Graphical abstract <p>A new copper(II) coordination polymer, [Cu(suc)(pyz)_0.5]_n, having&#xa0;a doubly interpenetrating α- Po-type three-dimensional framework is reported.</p> <p></p>