Temperature-driven switching of helical chirality of poly[(4-carboxyphenyl) acetylene] induced by a single amidine enantiomer and memory of the diastereomeric macromolecular helicity

Macromolecules

Volumn 39, Issue 2, 2006, Pages 482-488

  Hasegawa, Takashi ^a,b   Morino, Kazuhide ^a   Tanaka, Yoshie ^b   Katagiri, Hiroshi ^b   Furusho, Yoshio ^b   Yashima, Eiji ^a,b  

^a NAGOYA UNIVERSITY   (Japan)

^b JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

AMINES; STEREOCHEMISTRY; SYNTHESIS (CHEMICAL); THERMAL EFFECTS;

HELICAL CHIRALITY; HELICITY INDUCTION ABILITIES; TEMPERATURE-DRIVEN SWITCHING;

POLYACETYLENES;

EID: 31544463809     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma052206w     Document Type: Article

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63. The changes in the Cotton effect sign of the poly-1-(R,R)-2 complex were highly dependent on the molar ratio ([(R,R)-2]/[poly-1]) and temperature and were hardly observed when [(S,A)-2]/[poiy-1] ≥ 3. At 25 °C, the ICD changes more rapidly occurred at [(R,R)-2]/[poly1] = 2, but the complex precipitated after 32 h. Therefore, we employed the poly-1-(R,R)-2 complex ([(R,R)-2]/[poly-1] = 1) for the CD inversion experiments.
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69. The memory efficiency decreased with decreasing concentration of 4 in the mobile phase, whereas we found no significant changes in the memory efficiency in the concentration ranges of 0.8-0.008 M for 5 (Table 1). Therefore, we set the concentrations of 4 and 5 in the mobile phase at 0.8 and 0.008 M, respectively.
70. 2nd = -8.55 and -9.30, respectively) could also be memorized with 4 and 5; the respective memory efficiencies were 75% and 93% for 4 and 86% and 86% for 5.