The photostabilities of a series of nonlinear optical (NLO) polyimides containing two different chromophores were
measured at 655 nm where the spectral response is dominated by separated chromophores rather than J-aggregation. We
investigated the effect of ring-locking of the chromophore conjugated backbone, variations in the chromophore number
density and the incorporation of an anti-oxidant. We found that none of these modifications altered the initial
photodegradation at 655 nm.
A series of right-hand-side hydroxy functionalized merocyanines containing a powerful cyanodicyanomethylidenedihydrofuran electron acceptor has been designed and synthesized. Using the "build up" approach to synthesis, variations in both the donor moiety and conjugation length of these zwitterionic systems are possible, thereby giving rise to a suite of chromophores. Hyper-Raleigh scattering has confirmed that the highly conjugated chromophores <b>8c</b> and <b>10c</b> have large first hyperpolarizabilities (β<sub>ο</sub>) - values that are of a similar magnitude to many of those reported for "bench mark" left-hand-side systems. The hydroxy functionalized chromophores were successfully grafted at various loadings onto a series of recently developed carboxylic acid containing polyetherimides.