Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 72, Issue 11, Pages 904-911Publisher
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2012.08.009
Keywords
Chiral phosphate anion; Conjugated polymer; Zincke salts; Ring-opening copolymerization; Through-space interaction
Funding
- Ministry of Education, Science, Culture, and Sports Japan [21550173]
- Grants-in-Aid for Scientific Research [21550173] Funding Source: KAKEN
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Reactions of N-(2,4-dinitrophenyl)-4-arylpyridinium chlorides (aryl = H (1), phenyl (Ph); 2, and 4-pyridyl (Py); 3) with R-(-)-. S-(+)-, or racemic 1,1'-binaphthyl-2,2'-diyl sodium phosphates (R-, S-, or rac-BINAP-PO4Na) resulted in anion exchange between Cl- and R-, S-, or rac-BINAP-PO4- to yield Zincke salts with chiral anions, namely 1R, 2R, 3R, 1S, 2S, 3S, 1rac, 2rac, and 3rac. Reactions of these Zincke salts with 2-methylpiperazine resulted in pyridinium ring opening to yield ionic polymers with 5-(2-methylpiperazinium)-3-aryl-penta-2,4-dienylideneammonium 1,1'-binaphthyl-2,2'-diyl phosphate units, namely, polymer(rac-Me; Ar; R-BINAP-PO4-) (Ar = H, Ph, and Py), polymer(rac-Me; Ar; S-BINAP-PO4-) (Ar = H, Ph, and Py), and polymer(rac-me; Ar; rac-BINAP-PO4-) (Ar H, Ph, and Py). CD measurements revealed a partially helical conformation of the main chain in polymer(rac-Me;H;R-BINAP-PO4-) and polymer(rac-Me; H; S-BINAP-PO4-). The 2-methylpiperazinium rings of the polymers converted from the boat to the chair form via a half-chair intermediate in solution. This conformational change was accompanied by a decrease in pi-conjugation length. This decrease corresponded to a shift in the electrochemical oxidation peaks of the polymers to higher potentials when the polymer solution was left standing in air. (C) 2012 Elsevier Ltd. All rights reserved.
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