| 摘要 |
A nonlinear optical material which is characterized as having a relatively high macroscopic dipole moment achieved through the generally parallel packing of dipolar molecules in a relative orientation to reinforce their dipole moments. The nonlinear optical material may be a crystalline azine or imine bridged di-arene in which the arenyl groups, which can be the same or different, are substituted with an electron donor group on the first arenyl group Ar1 and A is an electron acceptor group which is substituted on the second arenyl group Ar2. B is an azine or imine bridge which extends between and interconnects the first and second arenyl groups. The nonlinear optical material has a dipole alignment factor of at least 0.1, more preferably, at least 0.5. A more specific nonlinear optical material is a crystalline azine bridged di-arene having a net macroscopic dipole moment and characterized by the formula:Here, Ar1 and Ar2 are arenyl groups which may be the same or different and are selected from the group consisting of mononuclear aryl groups and conjugated dinuclear aryl groups. D and A are electron donor and electron acceptor substituents, respectively and E1 and E2 are each independently substituted or unsubstituted methylene or ethylene groups which may be the same or different and which can have substituent side groups which contain 1 or 2 carbon atoms and which can be racemically configured.
|
