Synthesis, crystal structure, and second-order nonlinear optical properties of a new bis(salicylaldiminato)nickel(II) metal complex

The synthesis, crystal structure, electronic and second-order nonlinear opt ical (NLO) properties of a new bis(salicylaldiminato)nickel(II) Schiff-base complex are reported. The compound crystallizes in the space group P (1) o ver bar. The NLO properties are investigated by electric field induced seco nd harmonic (EFISH) and by INDO/SCI-SOS calculation. This compound obtained by condensation of 4-(diethylamino)salicylaldehyde and 1,2-diamino-4,5-din itrobenzene in the presence of nickel(II) chloride exhibits the largest sec ond-order NLO response reported for this family of bis(salicylaldiminato)ni ckel(II) metal complexes, with a beta x mu value of 1530 x 10(-48) cm(5) es u(-1). In addition, a thermal stability up to 300 degrees C, indicates pote ntial uses of metal-salen derivatives in poled polymers matrix with high T- g.