2ND-HARMONIC GENERATION FROM SINGLE-CRYSTALS OF N-SUBSTITUTED 4-NITROANILINES

Six RT-substituted derivatives of 2-methyl-4-nitroaniline (MNA) and tw o N-substituted derivatives of 4-nitroaniline were synthesized and the ir physical and optical properties were examined in the search for non linear optical materials with a sufficiently large second harmonic (SH ) activity and applicability to practical use. Some derivatives produc ed single crystals and their structures were determined by X-ray cryst allography. The trends of the SH intensity of these materials could be qualitatively explained based on the b tensor (the effective molecula r hyperpolarizability in the crystal). Amongst the derivatives examine d in this investigation, N-benzyl-MNA showed the highest SH activity ( up to twice that of MNA), thermostability and phase-matching ability.