Coordination and hydrogen bonded network structures of Cu(ii) with mixed ligands: a hybrid hydrogen bonded material, an infinite sandwich arrangement, and a 3-D net

Abstract

Mixed-ligand Cu(II) complexes with deprotonated trimesic acid and phenanthroline-type ligands were synthesised by solvothermal methods to form 2-D infinite hexagonal hydrogen bonded structures with additional trimesic acid (H₃tma) molecules. The complex [Cu(phendione)₂(H₂tma)₂]·2(H₃tma)·1.65(CF₃CH₂OH)·2.5(H₂O), where phendione = 1,10-phenanthroline-5,6-dione, has hydrogen bonded networks of [Cu(phendione)₂(H₂tma)₂] complexes interspersed with layers of H₃tma with a topologically identical hydrogen bonding network. Whereas in [Cu(1,10-phenanthroline)(H₂tma)₂]₂·2(H₃tma), a dimeric Cu(II) complex hydrogen bonds directly to additional H₃tma molecules to form a three-layered 2-D network resembling an infinite sandwich. The synthesis and structures of simple Cu(II) complexes of the phendione ligand are also reported. One of these, [Cu(phendione)₂Br₂] shows a particularly polar packing arrangement.