Two coordination polymers with distinct structures have been prepared under hydro­thermal conditions, based on mixtures of benzene-1,3,5-tri­carb­oxy­lic acid and trans-1-(pyridin-3-yl)-2-(pyridin-4-yl)ethene, together with two different d¹⁰ metal ions. Both compounds exhibit good photocatalytic properties in the decomposition of the organic dye contaminant of rhodamine B.

A three-dimensional cadmium(II) supra­molecular framework was prepared by the hydro­thermal reaction between Cd(NO₃)₂·4H₂O, 1,4-bis­(pyridin-4-yl)buta-1,3-diene and adipic acid. This supra­molecular architecture is formed by the inter­linkage of a threefold inter­penetrating diamondoid coordination network through O—HO hydrogen-bonding inter­actions.