H-NMR and TLC. The third-order NLO properties of the monomers and copolymers were measured by Z-scan technique. Results show that both monomers and copolymers have reverse saturable absorption (RSA) and selfdefocusing effects. For monomers, NA3OPH has larger third-order NLO susceptibility χ (3) than NAOPH due to introduction of two more methoxy groups. For all copolymers, larger χ (3) is observed when content of 1,8-naphthalimide chromophores was higher.
Molecule based organic memory devices have attracted considerable attention for high density data storage. Recent studies have verified that organic molecules with donor (D)–acceptor (A) structures play a key role in memory performance. The relationship between their structure related effects (such as the choice of functional group, the arrangement of donor and acceptor in the molecule, etc.) and memory behavior is discussed in detail in this chapter.
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