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

Autor: Kumiko Nishinaka, Jiandong Han, Dongli Han, Yue Liu, Yanqing Du, Meiling Wang, Chaolu Eerdun, Nobuyasu Naruse, Yutaka Mera, Yoshio Furusho, Akihiko Tsuda
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Frontiers in Chemistry, Vol 8 (2020)
Druh dokumentu: article
ISSN: 2296-2646
DOI: 10.3389/fchem.2020.613932
Popis: 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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