AbstractTwo metal organic frameworks involving α, ω-dicarboxylates and 2,2′-bpy, [Cu(2,2Bpy)(μ-adipate-H2)] n ·2·H 2 O 1 and [Cu 2 (2,2′-bpy) 2 (μ-adipate-H) 2 (μ-adipate-H2)]·3H 2 O 2 have been synthesized by one pot reaction and structurally characterized. Pentacoordinated Cu(II) zigzag polymeric chain of 1 is composed of linking the adjacent Cu(2,2′-bpy)(H 2 O) units through terminal craboxylate oxygens of two different adipate dianion in cis coordination pattern with the metal center. Both the Complexes were crystallized in triclinic system, P-1 space group with cell parameters a = 6.8948(5), b = 10.7098(7), c = 12.4332(8) A; α = 82.1120(10), β = 80.4950(10), γ = 72.9560(10)°, V = 861.87(10) A 3 for 1, a = 9.5058(6), b = 9.9341(7), c = 12.6460(8) A; α = 70.5080(10), β = 73.5740(10), γ = 75.0720(10)°, V = 1062.05(12) A 3 for 2 respectively. Extensive hydrogen bonding interaction is observed between the lattice water molecules and the coordination network. Compound 2 is a layered architecture, where the neutral framework is constructed by two different adipate anions (in monoanionic and dianionic form) coordinating to the metal center. Interestingly, three water molecules present in the lattice of compound 2 are involved in hydrogen bonding network among themselves, creating a centro-symmetric hexameric water cluster composed of a tetracyclic ring with dangling water molecules attached at alternate positions of the rectangle, which interact with the carboxylate oxygen, thereby extending the hydrogen bonded water network.Graphical AbstractTwo ternary Cu(II) metal-organic coordination networks involving N-donor ligand and adipic acid have been synthesized by one pot reaction. Single crystal investigation revealed that 1 is a zigzag and 2 is a layered network with Cu(II) possessing a distorted square pyramidal geometry. In both the complexes, intricate hydrogen bonding interaction exists between the lattice water molecules with the coordination framework. However, in complex 2, a new topology of hexameric water cluster residing between the adjacent layers of the coordination polymeric network involving hydrogen bonding interactions with the carboxylate oxygens has been observed.[IMAGE]