Using End Groups to Tune the Linear and Nonlinear Optical Properties of Bis(dioxaborine)-Terminated Polymethine Dyes
作者:Jonathan D. Matichak、Joel M. Hales、Shino Ohira、Stephen Barlow、Sei-Hum Jang、Alex K.-Y. Jen、Jean-Luc Brédas、Joseph W. Perry、Seth R. Marder
DOI:10.1002/cphc.200900635
日期:2010.1.18
variety of aryl groups appended to increase conjugation beyond the dioxaborine termini. The increased conjugation was expected to decrease the energy of the lowest‐lying excited state, and increase the transition dipole moment linking this state to the ground state, which would be anticipated to result in an increase in the real part of the third‐order polarizability, Re(γ). UV/Vis‐NIR absorption spectroscopy
六种阴离子染料五甲具有不同的2,2-二氟-4-芳基- 1,3,2(2 ħ )-dioxaborin -6-基末端被合成并分离为四- ñ带有各种芳基的辛基铵盐可以增加二氧杂硼酸末端以外的结合。共轭的增加预计会降低最低激发态的能量,并增加将该态连接到基态的跃迁偶极矩,这有望导致三阶极化率的实部增加。 ,Re(γ)。UV / Vis-NIR吸收光谱表明,DMSO中的吸收最大值在691至761 nm之间变化,对于芳基为4-硝基苯基的衍生物,观察到最长的波长跃迁。在DMSO中以1.3μm进行的闭孔Z扫描测量表明Re(γ)从-2.9×10 -33到-5.4×10 -33不等这些系统中的esu。对于具有E-4-苯乙烯基苯基芳基的染料,观察到最大的Re(γ)值。可以使用两态表达式来合理化此结果,该表达式将Re(γ)与从基态到最低激发态的跃迁的能量和跃迁偶极矩相关。还合成了该化合物的nonamethine