title: Triple-stranded metallo-helicates addressable as Lloyd's electron spin qubits.
abstract: We have first achieved the synthesis of triple-stranded metallo-helicates composed of 4,4':2',2'':4'',4'''-quaterimidazole (Qim) and Mn(II) or Zn(II) ions, which serve as synthetic electron spin qubits (quantum bits). In the crystal structure, a hydrogen-bonding network through counteranions and/or crystal solvents was constructed by the outward N-H hydrogen-bonding functional groups intrinsic to the imidazole skeleton. Importantly, these helicates showed high stability even in a solution state at room temperature. These salient features of triple helicates of Qim are different from those of reported metallo-helicates. These chemical properties of the Qim-based triple helicates allow us to synthesize magnetically diluted single crystals composed of Mn(II) (S = 5/2) and diamagnetic Zn(II) complexes of Qim in an appropriate Mn(II)/Zn(II) ratio. The magnetically diluted crystals can afford to build up the prototype of electron-spin qubits of Lloyd's one-dimensional periodic system, which gives a practical approach to scalable quantum computers/quantum information processing systems (QCs/QIPSs). The experiments have proven the practical capability of oligo(imidazole)s as a component of Lloyd's system which has nonequivalent g-tensors within the helicate (g-engineering). The helical symmetry plays an important role in giving a prototype of the synthetic spin qubits of the formidable Lloyd model. This result links supramolecular chemistry to the field of QCs/QIPSs.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. morita@chem.sci.osaka-u.ac.jp
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Morita
authors.forename: Yumi
authors.initials: Y
authors.lastname: Yakiyama
authors.forename: Shigeaki
authors.initials: S
authors.lastname: Nakazawa
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Murata
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Ise
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hashizume
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shiomi
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Sato
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kitagawa
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Nakasuji
authors.forename: Takeji
authors.initials: T
authors.lastname: Takui
mesh_terms: D004583:Electrons; D007093:Imidazoles / Q000737:chemistry; D008345:Manganese / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry
chemical_list: D007093:Imidazoles; D009942:Organometallic Compounds; D008345:Manganese; D015032:Zinc