A cadmium oxybisbenzoate/pyridylnicotinamide coordination polymer with a new 8-connected self-penetrated topology

• Cadmium coordination polymer with V-shaped oxybisbenzoate (oba) ligand
• Kinked 4-pyridylnicotinamide (4-pna) hydrogen-bonding capable co-ligand
• Two-fold interpenetrated [Cd2(oba)2]n dimer-based layers pillared by 4-pna
• Overall 8-connected self-penetrated network with 42464 topology

Crystals of {[Cd(oba)(4-pna)]·0.25H2O}n (1, oba = oxybisbenzoate, 4-pna = 4-pyridylnicotinamide) were prepared by hydrothermal methods. A single-crystal structure determination showed the presence of two-fold interpenetrated [Cd2(oba)2]n dimer-based (4,4) layers, featuring embedded {Cd2O2} dimers that serve as 4-connected nodes. In turn these layers are connected by the dipodal 4-pna ligands into a [Cd(oba)(4-pna)]n 3-D coordination polymer network. Including these connections, the {Cd2O2} dimers can be considered as 8-connected nodes; these build a new but simple self-penetrated network with a 42464 topology substantially different from a standard body centered cubic bcu net. Luminescent and thermal properties of 1 are also reported.

{[Cd(oba)(4-pna)]·0.25H2O}n (1, oba = oxybisbenzoate, 4-pna = 4-pyridylnicotinamide) shows a {Cd2O2} dimer-based 8-connected self-penetrated network with a 42464 topology substantially different from the body centered cubic bcu net.Figure optionsDownload as PowerPoint slide