Nitro compounds, molecular association

In conclusion, molecules other than nitro-compounds, having strong total moment or strong group moments, e.g. Aids, quinone, phthalic anhydride, can produce with molecules possessing easily polarized groups molecular associations of remarkable stability, the production of which should be governed by the theory outlined above. 

However, as far as interplay of conductivity and second-order NLO in hybrid molecular materials is concerned, very few studies are available (534, 535). As previously mentioned, both conducting and second-order NLO properties are formally connected to the same concept of charge transfer, though intermole-cular in conductors but intramolecular in compounds exhibiting second-order optical nonlinearity. Attempts to associate the [Ni(dmit)2] anion with cationic cyanine dyes known to exhibit second-order optical non-linearity such as DAMS+ (4-dimethylamino-l-methylstibazolium), DAMP+ (4-dimethylamino-1-methylpyridinium) and NOMS+ (4 -nitro-l-methylstibazolium) (Scheme 28)... 

---