| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 91 === The first part of this thesis is to analyze the molecular arrangement of bis[1-3´,4´,5´-trioctyloxyphenyl-3-(4´-octyloxphenyl) propane-1,3-dionate] palladium
(II) (Pd(II)BPOC8) and bis[1-3´,4´,5´-trihexadecyloxyphenyl-3-(4´-hexadecyloxy-ph-
enyl)-propane-1,3-dionate] palladium (II) (Pd(II)BPOC16), two discotic metallomeso-
gens, on the basal plane of HOPG. Experimentally, it was observed by scanning tunnelling microscopy (STM) with near molecular resolution that these molecules form regular and cognate surface structures upon adsorption on HOPG. However, the expansion of 2D array is not proportionate in two unit vectors, suggesting that the Pd(II)BPOCn assembling process is correlated with the conformation structure of alkoxy substitution which might affect the way molecules interdigitate. Using molecular simulation technique, a simplified model for the molecular packing pattern of Pd(II)BPOC16 on HOPG has been deduced and compared to that of Pd(II)BPOC8.
The second part of this thesis is to synthesize the derivatives of newly designed rod-like liquid crystal molecules (compound 1, n= 3, 6, and 16), by means of the following reaction scheme :
The resulting compounds were characterized using NMR, IR, EA, MASS, DSC, and POM. For n=3 and n=6, the molecules show nematic liquid crystal phase, while for n=16, only smetic C phase was observed. A complete discussion for the variation of mesophase as a function of chain length is also given in this thesis.
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