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。
Synthesis and 1H-NMR complexation studies of alkalimetal bithioxanthylidene crown ether complexes
作者:Anne Marie Schoevaars、Ron Hulst、Ben L. Feringa
DOI:10.1016/0040-4039(94)88375-0
日期:1994.12
synthetic routes to a novel class of sterically overcrowded alkenes, bithioxanthylidenecrownethers 1, are described. The 1H spin-lattice relaxation times (T1) of the crownethers as well as those of the corresponding complexes with Li+, Na+, K+, Rb+ and Cs+ in CDCl3 were measured and the results were interpreted in terms of complexation affinities.
Sterically overcrowded alkenes; synthesis, resolution and circular dichroism studies of substituted bithioxanthylidenes
作者:Wolter F. Jager、Ben de Lange、Anne Marie Schoevaars、Fré van Bolhuis、Ben L. Feringa
DOI:10.1016/s0957-4166(00)80349-3
日期:1993.7
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'.