Poly diazene

For, example, joining azo groups into are rigid carbon poly cycle, such as in bis (diazenes) N1 and N2. These proximate, parallel in-plane preoriented bis(diazenes) were synthesized by the Prinzbach group are candidates for lacking N=N/N=N photocycloadditions. Thett-tt distances (d) are equal to approximately 280 pm and the nitrogen lone pairs are unable to interact because of steric reasons. On the other hand, an efficient overlap of the p orbitals is enforced. 

Ho, M. S., Barrett, C., Paterson, J., Est hamatian, M., Natansohn, A., Rochon, P. (1996). Synthesis and optica) properties of poly(4 -nitrophenyl-3-[N-[2-(methacryloy oxyi-ethyl]]carbazolyl diazene). Macromolecules 29,4613—4618. 

M. Ho, C. Barrett, J. Paterson, M. Esteghamatian, A. Natansohn, P. Rochon, Synthesis and optical properties of poly (4-nitrophenyl)-[3-[A/-[2-(methacryloyloxy) ethyl]- carbazolyl]]-diazene. Macromolecules 29, 4613-4618 (1996)... 

---