Second-order non linear optical properties of nitrocalixarenes grafted to a sol-gel matrix
Abstract
5,11,17,23-Tetranitro-25-[4-[3-(trimethoxysilyl)propylthio]-butyloxy]-26,27,28-tripropyloxycalix[4]arene was prepared and fully characterized using 1H and 13C NMR. Elaboration of sol-gel matrix with this macrocycle and with tetranitrotetrapropoxycalix[4]arene from tetraethoxysilane was described. Thin films were obtained from these materials and studied using m-lines spectroscopy, AFM and NLO. Chemically grafted films exhibited high and stable NLO responses.