Journal
FRONTIERS IN CHEMISTRY
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2020.613932
Keywords
coordination polymer; helical polymer; complex; π -conjugation; chirality
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Funding
- Ministry of Education, Science, Sports, and Culture, Japan [17H02740]
- National Natural Science Foundation of China [21961026]
- Ministry of Science and Technology, China
- Grants-in-Aid for Scientific Research [17H02740] Funding Source: KAKEN
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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 pi-conjugation polymer (Poly-BPI/Pd). It is stable in solutions at room temperature, and allowed measurement of its average molecular weight in SEC (M-w = 106,000 and M-n = 18,000, M-w/M-n = 5.88). It also provided a reversible multi redox profile in cyclic voltammetry, most likely originating from strong pi-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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