1 research outputs found
Gold(I)-Coordination Triggered Multistep and Multiple Photochromic Reactions in Multi-Dithienylethene (DTE) Systems
The preparation, characterization, and photochromic properties
of a mononuclear goldĀ(I) complex (<b>1oo</b>) with two identical
DTE-acetylides and a dinuclear goldĀ(I) complex (<b>2ooo</b>)
with both DTE-acetylide and DTE-diphosphine are described. Both goldĀ(I)
complexes exhibit multistep and multiple photocyclization/cycloreversion
reactions. Particularly, four-state and four-color photochromic switch
is successfully achieved for the dinuclear goldĀ(I) complex upon irradiation
with appropriate wavelengths of light. In contrast, fully ring-closed
form is unattained through multiple photocyclization for the two corresponding
model organic compounds coupling with the same DTE units as goldĀ(I)
complexes but without goldĀ(I)-participation. It is demonstrated that
coordination of goldĀ(I) ion to DTE-acetylides exerts indeed a crucial
role in achieving stepwise and selective photocyclization and cycloreversion
reactions for both goldĀ(I) complexes, in which the coordinated goldĀ(I)
atom acts as an effective ābarrierā to prohibit intramolecular
energy transfer between multi-DTE moieties