title: New approach for designing single-chain magnets: organization of chains via hydrogen bonding between nucleobases.
abstract: Two one-dimensional (1D) manganese complexes, [Mn(2)(naphtmen)(2)(L)](ClO(4))·2Et(2)O·2MeOH·H(2)O (1) and [Mn(2)(naphtmen)(2)(HL)](ClO(4))(2)·MeOH (2), were synthesized by using a bridging ligand with a nucleobase moiety, 6-amino-9-β-carboxyethylpurine, and a salen-type manganese(III) dinuclear complex, [Mn(2)(naphtmen)(2)(H(2)O)(2)](ClO(4))(2) (naphtmen(2-) = N,N'-(1,1,2,2-tetramethylethylene)bis(naphthylideneiminato) dianion). In 1 and 2, the carboxylate-bridged Mn(III) dinuclear units are alternately linked by two kinds of weak Mn···O interactions into 1D chains. As a result, canted antiferromagnetic and ferromagnetic interactions are alternately present along the chains, leading to a 1D chain with non-cancellation of anisotropic spins. Since the chains connected via H-bonds between nucleobase moieties are magnetically isolated, both 1 and 2 act as single-chain magnets (SCMs). More importantly, this result shows the smaller canting angles hinder long-range ordering in favor of SCM dynamics.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aobaku, Sendai 980-8578, Japan. sysuzwx@gmail.com
authors.forename: Wei-Xiong
authors.initials: WX
authors.lastname: Zhang
authors.forename: Takuya
authors.initials: T
authors.lastname: Shiga
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Miyasaka
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamashita
mesh_terms: D006860:Hydrogen Bonding; D059346:Magnets; D008345:Manganese / Q000737:chemistry*; D009696:Nucleic Acids / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D009696:Nucleic Acids; D009942:Organometallic Compounds; D008345:Manganese