title: Stabilization of Pd(III) states in nano-wire coordination complexes.
abstract: In spite of a long history of quasi-one-dimensional halogen-bridged complexes (MX-chains), all Pt and Pd complexes form the charge-density wave (CDW) state (-X...M(II)...X-M(IV)-X...), while all Ni complexes form Mott-Hubbard (MH) states (-X-Ni(III)-X-Ni(III)-X-), without exception. We have succeeded in stabilizing the Pd(iii) MH state for the first time by utilizing the following two methods: partial substitution with Ni(iii) ions, [Ni(1-x)Pd(x)(chxn)(2)Br]Br(2), and chemical pressure via long alkyl chains introduced as counter-anions, [Pd(en)(2)Br](C(n)-Y)(2).H(2)O. In both systems, it has been revealed that the electronic state of bromo-bridged Pd compounds are determined by the PdPd distances, in other words, CDW and MH states are stabilized when PdPd distances are longer and shorter than 5.26 A, respectively.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan. yamasita@agnus.chem.tohoku.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamashita
authors.forename: Shinya
authors.initials: S
authors.lastname: Takaishi
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D008958:Models, Molecular; D053770:Nanowires / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D010165:Palladium / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D010165:Palladium; D009532:Nickel