Frontiers in Chemistry (Dec 2020)

A Chiral Metal-Organic 1D-Coordination Polymer Upon Complexation of Phenylene-Bridged Bipyrrole and Palladium (II) Ion

  • Kumiko Nishinaka,
  • Jiandong Han,
  • Dongli Han,
  • Yue Liu,
  • Yanqing Du,
  • Meiling Wang,
  • Chaolu Eerdun,
  • Nobuyasu Naruse,
  • Yutaka Mera,
  • Yoshio Furusho,
  • Akihiko Tsuda,
  • Akihiko Tsuda,
  • Akihiko Tsuda

DOI
https://doi.org/10.3389/fchem.2020.613932
Journal volume & issue
Vol. 8

Abstract

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Metal-organic 1D-coordination polymers, having unique electronic and optical properties, are expected to be a novel advanced functional material capable of fabricating smart plastics, films, and fibers. In this study, we have synthesized a novel metal-organic 1D-coordination polymer composed of a phenylene-bridged bipyrrole bearing N-alkylimino groups (BPI) and palladium(II) ion. The BPI and Pd(II) form square planar bis(bidentate) complex to form a metal coordinated π-conjugation polymer (Poly-BPI/Pd). It is stable in solutions at room temperature, and allowed measurement of its average molecular weight in SEC (Mw = 106,000 and Mn = 18,000, Mw/Mn = 5.88). It also provided a reversible multi redox profile in cyclic voltammetry, most likely originating from strong π-electronic interactions between the BPI components via Pd ion. A variety of substituent groups can be attached to the imino-nitrogens of BPI. A coordination polymer composed of a BPI derivative bearing chiral alkyl chains and Pd(II) showed strong circular dichroism (CD) in the solution due to the unidirectional chiral conformation of the BPI components in the polymer backbone.

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