کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1334255 | 1500229 | 2016 | 10 صفحه PDF | دانلود رایگان |
Reactions of transition metal acetates with dicarboxylic ligands and bis(imidazole) ligands afforded three coordination polymers, [Ni(1,2-BIB)(CEDA)]·1.5H2O 1, [Zn(1,2-BIB)(CADA)] 2 and [Zn2(1,4-BIB)2(CEDA)2]·2H2O 3, (1,2-BIB = 1,2-bis((1H-imidazol-1-yl)methyl)benzene, H2CEDA = cyclohex-4-ene-1,2-dicarboxylic acid, H2CADA = cyclohexane-1,2-dicarboxylic acid, 1,4-BIB = 1,4-bis((1H-imidazol-1-yl)methyl)benzene). Compounds 1 and 2 present a 2D rhombohedral grid sheet with the same topology. Compound 3 exhibits a (3, 4)-nodal 2D sheet with a point Schläfli symbol {4, 62}{4, 64, 8}. Z-scan experiments were carried out to evaluate the third-order nonlinear optical (NLO) performance of three compounds. The results show that they exhibit strong third-order NLO absorption in DMSO solution and thin films. The NLO absorptive coefficients β(MKS) in solution are evaluated to be 1.01 × 10−10 m W−1 for 1, 0.42 × 10−10 m W−1 for 2 and 0.46 × 10−10 m W−1 for 3. The third-order NLO susceptibility χ(3) are calculated as 3.54 × 10−12 esu for 1, 1.47 × 10−12 esu for 2 and 1.61 × 10−12 esu for 3. Interestingly, three compounds show much stronger NLO absorption in thin films with absorptive coefficients β(MKS) 6.41 × 10−5 m W−1 for 1, 3.26 × 10−5 m W−1 for 2 and 0.39 × 10−5 m W−1 for 3. In addition, compound 2 exhibits strong self-focusing effects with γ 5.35 × 10−12 m2/W. The corresponding third-order NLO susceptibility χ(3) are calculated as 1.03 × 10−5, 0.56 × 10−5 and 0.063 × 10−5 esu, respectively. The composition of frontier orbitals of three compounds was investigated by using density functional theory (DFT). The influence of frontier orbitals on the third-order NLO properties was discussed.
Three 2D coordination polymers 1, 2 and 3 based on bis(imidazole) ligands and dicarboxylic ligands were reported, and they exhibits strong NLO effects in thin films with NLO susceptibility χ(3) 1.03 × 10−5, 0.56 × 10−5 and 0.063 × 10−5 esu, respectively.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 111, 17 June 2016, Pages 16–25