Photochromism of Metal Complexes Composed of Diarylethene Ligands and Zn(II), Mn(II), and Cu(II) Hexafluoroacetylacetonates

Abstract

Metal complexes composed of bidentate 1,2-bis(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene (1a) and monodentate 1-(2-methyl-5-phenyl-3-thienyl)-2-(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene (2a) photochromic ligands and M(hfac)(2) (M = Zn(II), Mn(II), and Cu(II)) were prepared, and their photoinduced coordination structural changes were studied. X-ray crystallographic analyses showed the formation of coordination polymers and discrete 1:2 complexes for bidentate and monodentate ligands, respectively. The complexes underwent reversible photochromic reactions by alternate irradiation with UV and visible lights in solution as well as in the single-crystalline phase. Upon photoirradiation with UV and visible light, the ESR spectra of the copper complexes of 1a reversibly changed. While the open-ring isomer gave an axial-type spectrum, the photogenerated closed-ring isomer showed a rhombic-type spectrum. This indicates that the photoisomerization induced the change in the coordination structure.

Flexible interlocked porous frameworks allow quantitative photoisomerization in a crystalline solid

“…A flexible porous crystal was prepared using a photochromic module, a bis(pyridyl)dithienylethene ( L O ) 36, 37 that shows a highly effective interconversion between open- ( L O ) and closed-ring ( L C ) isomers (Fig. 1) in various solvents (Supplementary Fig.…”

Photoswitching the Cytotoxic Properties of Platinum(II) Compounds

“…[12] Thec rystal structures of one coordination compound from L H [13] and five coordination compounds from L F [10,14] have been reported so far,but none of them with platinum as metal. [12] Thec rystal structures of one coordination compound from L H [13] and five coordination compounds from L F [10,14] have been reported so far,but none of them with platinum as metal.…”

Modulation of color change and photocyclization of diarylethene with metal complex

“…Results suggested that no complex was formed between 2a or 2b with Cu 2+ , and the binding site occurred at O atom instead of at S and N atoms. The complex Cu–1a is probably formed48 by binding two Cu 2+ with two phenol units, which prefers to the photocyclization of diarylethene due to the increase of the anti‐parallel conformation 49, 50…”