SYNTHESIS, LANGMUIR-BLODGETT DEPOSITION AND OPTICAL CHARACTERIZATION OF A 4-ACETALPHENYL-SUBSTITUTED C-60-PYRROLIDINE DERIVATIVE C-60(C12H17NO2)

A new 4-acetalphenyl-substituted C-60-pyrrolidine derivative, C-60(C12 H17NO2) (1), has been prepared and its Langmuir films, with and withou t 22-tricosenoic acid [CH2=CH-(CH2)(20)CO2H(TA)], at the air/water int erface have been investigated. Pure 1 forms monolayers more easily tha n the parent molecule, C-60, and can be transferred onto solid substra tes to form Langmuir-Blodgett (LB) films. The mixed Langmuir films of 1 and TA were transferred onto hydrophilically pretreated quartz, glas s substrates and silicon wafers. Reflectometric measurement of a 63-la yer 1:2 mixed film on a silicon wafer using an He-Ne laser (lambda = 6 32.8 nm) provided a film thickness and refractive index of 171 nm and 1.73, respectively. Weak second harmonic generation (SHG) from LB mono layers of pure 1 and 1:2 and 1:4 mixed LB monolayer films of 1 and TA was observed. The second-order susceptibilities, chi(pp)((2)), Were ev aluated to be in the range (4-6) x 10(-9) esu.