Synthesis and crystal structure of poly[[bis(aqua-κO)tetrakis(μ-4,4′-bipyridine-κ² N:N′)hexakis(3-chlorobenzoato)-κ⁵ O;κ² O:O′-tricobalt(II)] methanol disolvate]

Abstract

A novel ladder-chain cobalt(II) coordination polymer, {[Co3(C7H4ClO2)6(C10H8N2)4(H2O)2]·2CH3OH} n , was synthesized and characterized. The structure contains two CoII centres with different octahedral environments, [Co(1)N3O3] and [Co(2)N2O4]. The O-donating 3-chlorobenzoate anions (3-Clbenz) act as the terminal ligands, while the N-donating 4,4′-bipy molecules play the role of linkers. The Co(1) ions are linked by 4,4′-bipy molecules into linear chains. Two such chains are joined by [Co(2)(3-Clbenz)2(H2O)2] units via two 4,4′-bipy bridging ligands, thus forming the ladder-chain structure. The crystal packing of the title compound is stabilized by supramolecular interactions, such as hydrogen bonding, π–π and halogen...π contacts, giving a three-dimensional framework. The spectroscopic and thermal properties of the title compound have also been investigated.