| Abstract: | In the development of coordination‐driven crystalline materials, O‐ and N‐atom donors from carboxylate and pyridyl‐based ligands are widely used classes of multidentate bridging ligands composed of several terminal coordinating groups linked by either rigid or flexible spacers. The rigidity of the ligands can play a vital role in the determination of the structures formed. A new CdII supramolecular compound, namely poly[μ‐adipato‐κ2O 1:O4‐μ‐adipato‐κ4O 1,O 1′:O 4,O4′‐diaquabis[μ‐1,4‐bis(pyridin‐4‐yl)‐1,3‐butadiene‐κ2N :N ′]dicadmium(II)], [Cd2(C6H8O4)2(C14H12N2)2(H2O)2]n , (I), has been synthesized by the self‐assembly of Cd(NO3)2·4H2O, adipic acid (hexane‐1,6‐dioic acid; H2adp) and the dipyridyl ligand 1,4‐bis(pyridin‐4‐yl)buta‐1,3‐diene (1,4‐bpbd) under hydrothermal conditions. Single‐crystal X‐ray diffraction analysis reveals that each CdII centre is located in a distorted octahedral coordination environment, coordinated by one water O atom, three carboxylate O atoms from two different adp2− ligands and two N atoms from two different 1,4‐bpbd ligands. The Cd(H2O) units are interconnected by the μ2,κ2‐adp2−, μ2,κ4‐adp2− and 1,4‐bpbd ligands, which lie across centres of inversion, to give a 66‐ dia network. Large cavities within a single diamondoid network permit the mutual threefold interpenetration of crystallographically equivalent frameworks. Hydrogen‐bonding interactions between the coordinated water molecules and adp2− carboxylate O atoms anchor the interpenetrating networks into a unique three‐dimensional supramolecular structure. Topologically, taking the coordinated water molecules and CdII centres as nodes, the whole architecture can be simplified as a binodal (3,7)‐connected supramolecular framework. The identity of (I) was further characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis and powder X‐ray diffraction. The solid‐state photoluminescence properties of (I) were also investigated. |
