臺灣博碩士論文加值系統

本篇論文以合成設計出四個系列之(-雙酮配位基金屬錯合物。藉著改變側鏈基的種類
、數目、長短和兩邊側鏈基碳數的差異，以及中心金屬離子之不同，來探討對於所合成金
屬錯合物之液晶行為和物理性質之影響。而針對我們的實驗結果，可以初步了解本研究所
合夾的金屬錯合物，若須具有液晶性質，則其側鏈基總數必須超過六個，而且兩邊側鏈碳
數的差異要小。以及中心金屬離子的電子密度要高。而此種金屬錯合物的液晶溫度範圍很
窄，而且無法由微差掃描熱量儀偵測出。其原因主要是由二級烷氧基之立體效應造成分子
間距離增大所致。又由偏光顯微鏡中觀察，初步可推斷此類液晶物質其液晶相為 Dhd，如
圖 ( 二十 )、( 二十一 )。
大致上來說，本研究所合成的金屬錯合物有良好的熱安定性。在加熱及冷卻時無任何
分解現象。其中以二價鈀離子錯合物的熔點最高，二價銅離子錯合物次之，氧釩離子由於
其分子構形為四方角錐形，故其熔點較低。此表示二價鈀離子由於電子密度高，造成分子
間配位作用力強，故具有較高的熔點。

Four series of (-diketonate complexes were prepared by modified process.
The mesomorphiz behavior and physical properties of metal complexes were
studied from the variation of metal ions, and numbers and structure of alkony
side-chains in the liquid.From the experimentalresults., the following
conclusions could be drawn.The number of side-chain should be six or more,
the length of different side-chains in the same liquid should be similar and
the metal ion should be high electron-density.
The metal complexes are thermally stable, but the mesophase range is
always narrow and may not be detected by DSC. Among the three types of
studied, the palladium(II) complexes were found to have highest isotropic
point, and oxovadium(IV) complexes the lowest. It is likely due to the strong
force of coordination between molecules caused by the high electronic
destiny.
Polarized optical microsopy indicates four of the Pd(II) complexes and
out one of Cu (II) complexes are liquid of crystal of Dhd type.To ear
knowledge, this are the first complexes of metal complexliquidcrystal
containing secondary alkony side-chain in the (-diketonate liquid.