期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 12, 期 8, 页码 927-935出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201700162
关键词
chirality; double helix; helical structures; helix inversion; molecular rotors
资金
- Japan Society for the Promotion of Science (JSPS) [25220804, 26810068]
- Grants-in-Aid for Scientific Research [26810068, 16H01016, 17K14470] Funding Source: KAKEN
Novel double helices covalently bridged by cyclic boronate esters were synthesized from complementary dimers with an m-terphenyl backbone joined by a chiral or achiral phenylene linker bearing diethyl boronates and diols, respectively. The X-ray crystallographic analysis and variable-temperature NMR and circular dichroism measurements, along with theoretical calculations, revealed that the double helices function as a molecular rotor in which the cyclic boronate ester units rotate, yielding two stable rotamers at low temperatures. Moreover, our data indicates that the covalently bonded double helices can undergo a unique helix-inversion simultaneously with a rotational motion of the boronate esters.
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