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By coupling the features of binaphthalene and anthracene, new binaphthalenes with two anthracene moietieswere designed and synthesized, aiming at developing chiral molecular switches. A strong CD signalwith negative sign due to the interchromophoric exciton coupling was observed for (
S)-
1 with -(CH
2)
2as the linker. This new CD signal became weak and the sign reversed by changing the linker to -(CH
2)
3in (
S)-
2 and -(CH
2)
6 in (
S)-
3. For (
S)-
4 with -(CH
2)
11 as the linker, no such CD signal was detected.Photodimerization of two anthracene moieties in these binaphthalene molecules can occur. The resultsshow that the CD spectra of (
S)-
1, (
S)-
2, (
S)-
3, and (
R)-
1 can be reversibly modulated by alternating UVlight irradiation and heating. Therefore, chiral molecular switches based on new binaphthalenes withtwo anthracene moieties are achieved.
