Synthesis, Characterization, Absorbance, Fluorescence and Non Linear Optical Properties of Some Donor Acceptor Chromophores
作者:Abdullah M. Asiri、Salman A. Khan、Muhammed S. Al-Amoudi、Kalid A. Alamry
DOI:10.5012/bkcs.2012.33.6.1900
日期:2012.6.20
Three carbazole chromophores featuring dicyano, cyano, ethyl acetate and dimethyl acetate groups as an acceptor moiety with a $\pi}$-conjugated spacer and $N$-methyl dibenzo[$b$]pyrole as donor were synthesized by Knovenagel condensation and characterized by IR, $^1HNMR$, $^13}CNMR$, UV-vis, fluorescence spectroscopy, electrochemistry and theoretical B3LYP/6-$311G^*$ level whilst NLO properties and spectroscopic quantities were calculated. Calculations showed remarkable trend with HOMO located on the donor moiety and LUMO on the acceptors dicyano methylene, cyano, ethyl acetate methylene and dimethyl acetate methylene. In agreement with the calculations, solvatochromic, behavior intramolecular charge transfer band was observed in the visible region.
通过Knovenagel缩合反应合成了三个咔唑发色团,其中以二氰基、氰基、乙酸乙酯和乙酸二甲酯基团作为受体部分,以$\pi}$共轭间隔物和$N$-甲基二苯并[$b$]吡咯作为供体,并通过红外、$^1HNMR$、$^13}CNMR$、紫外-可见、荧光光谱、电化学和理论B3LYP/6-$311G^*$水平进行了表征,同时计算了NLO属性和光谱量。计算表明,HOMO位于供体部分,而LUMO位于受体二氰基亚甲基、氰基、乙酸乙酯亚甲基和乙酸二甲酯亚甲基上,这一趋势非常明显。与计算结果一致,在可见光区域观察到了溶剂致色、分子内电荷转移带的行为。