title: The first heteropentanuclear extended metal-atom chain: [Ni⁺-Ru₂⁵⁺-Ni²⁺-Ni²⁺ (tripyridyldiamido)₄(NCS)₂].
abstract: This study develops the first heteropentametal extended metal atom chain (EMAC) in which a string of nickel cores is incorporated with a diruthenium unit to tune the molecular properties. Spectroscopic, crystallographic, and magnetic characterizations show the formation of a fully delocalized Ru2(5+) unit. This [Ru2]-containing EMAC exhibits single-molecule conductance four-fold superior to that of the pentanickel complex and results in features of negative differential resistance (NDR), which are unobserved in analogues of pentanickel and pentaruthenium EMACs. A plausible mechanism for the NDR behavior is proposed for this diruthenium-modulated EMAC.
authors.affiliation: Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617 (Taiwan), Fax: (+886) 2-33666359.
authors.forename: Min-Jie
authors.initials: MJ
authors.lastname: Huang
authors.forename: Shao-An
authors.initials: SA
authors.lastname: Hua
authors.forename: Ming-Dung
authors.initials: MD
authors.lastname: Fu
authors.forename: Gin-Chen
authors.initials: GC
authors.lastname: Huang
authors.forename: Caixia
authors.initials: C
authors.lastname: Yin
authors.forename: Chih-Hung
authors.initials: CH
authors.lastname: Ko
authors.forename: Ching-Kuo
authors.initials: CK
authors.lastname: Kuo
authors.forename: Chia-Hung
authors.initials: CH
authors.lastname: Hsu
authors.forename: Gene-Hsiang
authors.initials: GH
authors.lastname: Lee
authors.forename: Kuan-Yi
authors.initials: KY
authors.lastname: Ho
authors.forename: Chia-Hsin
authors.initials: CH
authors.lastname: Wang
authors.forename: Yaw-Wen
authors.initials: YW
authors.lastname: Yang
authors.forename: I-Chia
authors.initials: IC
authors.lastname: Chen
authors.forename: Shie-Ming
authors.initials: SM
authors.lastname: Peng
authors.forename: Chun-hsien
authors.initials: CH
authors.lastname: Chen
keywords: diruthenium unit; heterometal EMACs; molecular electronics; negative differential resistance; single-molecular conductance