title: An unusual 3D coordination polymer based on bridging interactions of the nucleobase adenine.
abstract: The first 3D coordination polymer containing a nucleobase as a bridging ligand, [[Cu2(mu-ade)4(H2O)2][Cu(ox)(H2O)]2 x approximately 14H2O]n (1), has been synthesized by reaction of adenine (Hade) with a basic solution of K2[Cu(ox)2] x 2H2O (ox = oxalato dianion). Compound 1 crystallizes in the trigonal space group R3 with a = b = 31.350(1) angstroms, c = 14.285(1) angstroms, V = 12158.7(10) angstroms3, and Z = 9. X-ray analysis shows a covalent 3D network in which the copper(II) centers are bridged by tridentate mu-N3,N7,N9 adeninate ligands. The compound has relatively large, nanometer-sized tubes associated with the self-assembly process directed solely by metal-ligand interactions. The covalent 3D framework remains intact upon removal of the guest water molecules trapped in the nanotubes. Magnetic measurements indicate an overall antiferromagnetic behavior of the compound.
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain.
authors.forename: Juan P
authors.initials: JP
authors.lastname: García-Terán
authors.forename: Oscar
authors.initials: O
authors.lastname: Castillo
authors.forename: Antonio
authors.initials: A
authors.lastname: Luque
authors.forename: Urko
authors.initials: U
authors.lastname: García-Couceiro
authors.forename: Pascual
authors.initials: P
authors.lastname: Román
authors.forename: Luis
authors.initials: L
authors.lastname: Lezama
mesh_terms: D000225:Adenine / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D008956:Models, Chemical; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D013816:Thermodynamics
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D011108:Polymers; D003300:Copper; D000225:Adenine