Stacked ring-like coordination complex molecules threaded by infinite water tapes

• Published in: Inorganic chemistry communications Vol. 43; pp. 56 - 59
• Main Authors: Stone, Brandon S., LaDuca, Robert L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2014
• Subjects: Coordination complex; Copper; Crystal structure; Water chain; Water chain; Copper; Coordination complex; Crystal structure
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2014.02.011

Crystals of {[Cu2(mal)2(bpfp)2(H2O)2]·10H2O}n (1, mal=malonate, bpfp=bis(4-pyridylformyl)piperazine) were prepared by slow diffusion of an ethanolic solution of bpfp into an aqueous solution of copper malonate. Single-crystal X-ray diffraction showed the presence of supramolecular stacks of ring-like [Cu2(mal)2(bpfp)2(H2O)2] neutral coordination complex molecules threaded by unique infinite water molecule tapes with a T6(6)4(4)4(3)4(3)A(2) classification. These feature six-membered chair conformation rings, four-membered rings, and are decorated by single water molecules. Hydrogen bonding acceptance by the formyl groups of the bpfp ligands proved critical in stabilizing the water molecule tapes within the nanotubular incipient channels. {[Cu2(mal)2(bpfp)2(H2O)2]·10H2O}n (mal=malonate, bpfp=bis(4-pyridylformyl)piperazine) possesses stacks of ring-like neutral coordination complex molecules threaded by unique infinite T6(6)4(4)4(3)4(3)A(2) water molecule tapes. [Display omitted] •Malonate (mal) and bis(4-pyridylformyl)piperazine (bpfp) form ring-like complex.•Stacking of [Cu2(mal)2(bpfp)2(H2O)2] complexes generates nanotubular channels.•Stacked rings are threaded by unique T6(6)4(4)4(3)4(3)A(2) water molecule tapes.•Water tapes are entrapped by hydrogen bonding acceptance by bpfp formyl groups.