A Versatile and Convenient Preparation of Unsymmetrical Diaryl Disulfides
作者:Dariusz Witt、Sebastian Demkowicz、Janusz Rachon
DOI:10.1055/s-2008-1067118
日期:——
of unsymmetrical diaryl disulfides under mild conditions in excellent yields. The described method is based on the straightforward preparation of 5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinane-2-sulfenyl bromide from readily available 5,5-dimethyl-2-sulfanyl-2-thioxo-1,3,2-dioxaphosphorinane or bis(5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinan-2-yl) disulfide. The unsymmetrical diaryl disulfides can
Unsymmetrical aryl disulfides with excellent transparency in the visible region for second order nonlinear optics
作者:Ramanathan Sudharsanam、Srinivasan Chandrasekaran、Puspendu Kumar Das
DOI:10.1039/b204034d
日期:2002.9.26
Several unsymmetrically substituted aromatic donor–acceptor disulfides have been synthesized and analysed for their second order nonlinear optical properties. These molecules exhibit moderately high first hyperpolarizability (β) with excellent transparency in the visible region. Most of the unsymmetrical disulfides have a cut-off wavelength below 420 nm. Calculations show that the molecules have an asymmetric charge distribution around the disulfide bond which is responsible for their high β values. These results provide motivation for the design and synthesis of nonlinear optical chromophores with multiple disulfide bonds for large second order nonlinearity and excellent visible transparency.