报道了来自光/电致变色取代的双噻吨亚基的完全可逆的三态蓝/红/关发射。二甲基-和二甲氧基-双-噻吨亚基的最稳定(反折叠)构象异构体的蓝色发光可以通过光化学转化为亚稳定(同步折叠)构象异构体而关闭,并通过热回复到反-折叠状态。bis-thiaxanthylium dication 的红色发光可以通过在大约 1.0 和 1.2 V vs SCE 的同步和反折叠构象异构体的氧化打开,并通过在大约 0.35 V vs SCE 还原关闭或变为蓝色。
Sterically overcrowded alkenes; synthesis, resolution and circular dichroism studies of substituted bithioxanthylidenes
摘要:
Bithioxanthylidenes with small substituents at positions 2 and 2' have been synthesized and resolved by chiral HPLC. The X-ray molecular structure of 9-(2'-methyl-9'H-thioxanthene-9'-ylidene)-9H-xanthene (17) confirms the folded form of these molecules. UV and CD studies of several bithioxanthylidenes are presented. The CD spectra of these molecules can be described qualitatively by subtracting the CD spectra of both differently sensed helices (M and P) present in the molecule, which can be distinguished by the substituents at positions 2 and 2'.
Fast synthesis and redox switching of di- and tetra-substituted bisthioxanthylidene overcrowded alkenes
作者:Brian P. Corbet、Marco B. S. Wonink、Ben L. Feringa
DOI:10.1039/d1cc03098a
日期:——
A rapid and efficient method for the synthesis of overcrowded alkenes using (trimethylsilyl)diazomethane provides a range of substituted bisthioxanthylidenes. We show large conformational redox switching from folded to orthogonal states, which tolerates many substitution patterns. The facile access to bisthioxanthylidene switches with the potential for further functionalization, in combination with