A novel spiroborate-baseddouble-strandedhelicatebearing photoresponsive cis-stilbene units in the middle (cis-3) was successfully synthesised from the corresponding cis-stilbene-bound tetraphenol strand in the presence of NaBH4, whereas the tetraphenol strands with a trans-stilbene or trans-azobenzene unit did not form such a double-strandedhelicate. The 1H NMR and NOESY experiments revealed that
Guest-Induced Unidirectional Dual Rotary and Twisting Motions of a Spiroborate-Based Double-Stranded Helicate Containing a Bisporphyrin Unit
作者:Shinya Yamamoto、Hiroki Iida、Eiji Yashima
DOI:10.1002/anie.201302560
日期:2013.7.1
red) between the two porphyrin rings of an optically active, porphyrin‐linkeddouble‐stranded spiroborate helicate triggered rotary motion of the porphyrin rings in one direction in conjunction with a unidirectional twisting motion of the spiroborate helix. This system has potential for the development of chirality‐responsive molecular machines.