title: 4-Substituent pyridine directed cobalt(II) azides: solvothermal synthesis, structure, and magnetic properties.
abstract: The structure and magnetism of three cobalt(ii)-azide complexes, [Co(N3)2(bepy)2]n (), [Co2(N3)4(vipy)4]n (), and [Co(N3)2(bipy)]n () were tuned by three structurally related 4-substituent pyridines, 4-benzylpyridine (bepy), 4-vinyl pyridine (vipy), and 4,4'-bipyridine (bipy) as co-ligands in solvothermal reactions. With flexible benzyl as a substituent group of the pyridine co-ligand, a one-dimensional (1D) complex with double end-to-end (EE) azide-bridging Co(ii) chain is formed. While using a rigid but small vinyl group as the substituent, a distinct Co(ii)-azide chain with alternate double end-on (EO) and double EE azide bridges was obtained. Finally, when another pyridine group was used instead of the substituent incapable of coordinating in and , a bipyridine, it gave rise to a chiral complex with a three-dimensional (3D) diamondoid Co(ii)-azide framework further reinforced by the bipy ligand. Magnetic studies indicate antiferromagnetic interactions between the Co(ii) ions in the three complexes, but interestingly, weak antiferromagnetism origin of spin canting exists in at low temperatures.
authors.affiliation: Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, P. R. China. jrli@bjut.edu.cn.
authors.forename: Jiong-Peng
authors.initials: JP
authors.lastname: Zhao
authors.forename: Cui
authors.initials: C
authors.lastname: Zhao
authors.forename: Wei-Chao
authors.initials: WC
authors.lastname: Song
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Yabo
authors.initials: Y
authors.lastname: Xie
authors.forename: Jian-Rong
authors.initials: JR
authors.lastname: Li
authors.forename: Xian-He
authors.initials: XH
authors.lastname: Bu