The second-order nonlinear optical properties of thiophene S,S -dioxides derivatives were studied by using the ZINDO-SOS method. The computed results show that the thiophene S,S -dioxide derivatives exhibit larger sec...The second-order nonlinear optical properties of thiophene S,S -dioxides derivatives were studied by using the ZINDO-SOS method. The computed results show that the thiophene S,S -dioxide derivatives exhibit larger second-order polarizabilities than their thiophene precursors. In order to clarify the origin of the different NLO responses among these chromophores, their electron properties and frontier orbital properties were investigated as well. These thiophene S,S -dioxides derivatives are good candidates for their application in electro-optical device due to their high nonlinearities, good thermal and photo stabilities.展开更多
采用量子化学ab initio HF方法,在6-31G(d)基组水平卜,对水杨醛缩乙二胺类双席夫碱及其Ni配合物体系进行几何构型优化.以优化的稳定构型为基础,利用INDO/CI方法计算体系的电子光谱,同时用ZINDO-SOS方法给出该系列分子二阶(βij...采用量子化学ab initio HF方法,在6-31G(d)基组水平卜,对水杨醛缩乙二胺类双席夫碱及其Ni配合物体系进行几何构型优化.以优化的稳定构型为基础,利用INDO/CI方法计算体系的电子光谱,同时用ZINDO-SOS方法给出该系列分子二阶(βijk)和三阶(γijk)非线性光学系数.计算结果表明,共轭性增强有助于增大分子的二阶及三阶非线性光学系数,双席夫碱化合物1的β和γ值分别为35.54×10^-30和-1.20×10^-34 esu,而共轭桥为萘环的化合物4的β和γ值分别为54.22×10^-30和2.00×10^-34 esu,端部引入苯并环的化合物5的β和γ值增加幅度更大.对应的金属Ni(Ⅱ)配合物的β值增加较明显,为配体的1.7~10.8倍,γ值也有不同程度的增加.展开更多
The second-order nonlinear optical (NLO) properties of a series of benzothiazole derivatives were studied by use of the ZINDO-SOS method. These chromophores are formed by a donor-π-bridge-acceptor system, based on a ...The second-order nonlinear optical (NLO) properties of a series of benzothiazole derivatives were studied by use of the ZINDO-SOS method. These chromophores are formed by a donor-π-bridge-acceptor system, based on a nitro group connected with benzothiazole as the acceptor and a hydroxyl-functional amino group as the donor. For the purpose of comparison, we also designed molecules in which nitrobenzene is an acceptor. The calculation results indicate that benzothiazole derivatives exhibit larger second-order polarizabilities than nitrobenzene derivatives. In order to clarify the origin of the NLO response of these chromophores, their electron properties were investigated as well. The benzothiazole derivatives are good candidates for application in electro-optical device due to their high optical nonlinearities, good thermal and photonic stability.展开更多
The first hyperpolarizabilities of a series of novel azulenic-barbituric acid chromophores have been studied by using 12 excitation wavelengths, ranging from 900 to 1907 nm. The dispersion relation of the first hyperp...The first hyperpolarizabilities of a series of novel azulenic-barbituric acid chromophores have been studied by using 12 excitation wavelengths, ranging from 900 to 1907 nm. The dispersion relation of the first hyperpolariza-bilities of chromophores holds the same tendency as the experimental results. In addition, the static first hyperpo-larizability 0 of molecules was calculated by means of the Sum-Over-States (SOS) expression and the two-level formula respectively. The results show that these molecules possess large static first hyperpolarizabilities and the 0 value increases as the donor or acceptor strength enhances; the distorted degree of molecules has also an important influence on the 0 value.展开更多
The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been ...The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been calculated. The influences of molecular structure, donor, acceptor and the frequency of external field on β and γ, and the relationship between γ and the number of thiophene rings (i. e. conjugated chain length) have been studied using INDO/SCI methods combined with sum-overstate (SOS) formula. The calculated results show that γ is proportional to 2.69 power of the chain length of the conjugated molecular bonds when the length is not quite long.展开更多
We have theoretically investigated the one- and two-photon absorption properties of C60 and C70 using the ZINDO method. From the results it is suggested that the one-photon absorption spectra are in agreement with the...We have theoretically investigated the one- and two-photon absorption properties of C60 and C70 using the ZINDO method. From the results it is suggested that the one-photon absorption spectra are in agreement with the experimental observations. It is found that the maximum TPA cross section of C70 is more than twice that of C60, which is consistent with the experimental results. A notable point is that the TPA process of C60 is different from that of C70 as well as other ordinary conjugated molecules.展开更多
基金Supported by the National Natural Science Foundation of China(No. 2 98730 2 5 )
摘要The second-order nonlinear optical properties of thiophene S,S -dioxides derivatives were studied by using the ZINDO-SOS method. The computed results show that the thiophene S,S -dioxide derivatives exhibit larger second-order polarizabilities than their thiophene precursors. In order to clarify the origin of the different NLO responses among these chromophores, their electron properties and frontier orbital properties were investigated as well. These thiophene S,S -dioxides derivatives are good candidates for their application in electro-optical device due to their high nonlinearities, good thermal and photo stabilities.
摘要采用量子化学ab initio HF方法,在6-31G(d)基组水平卜,对水杨醛缩乙二胺类双席夫碱及其Ni配合物体系进行几何构型优化.以优化的稳定构型为基础,利用INDO/CI方法计算体系的电子光谱,同时用ZINDO-SOS方法给出该系列分子二阶(βijk)和三阶(γijk)非线性光学系数.计算结果表明,共轭性增强有助于增大分子的二阶及三阶非线性光学系数,双席夫碱化合物1的β和γ值分别为35.54×10^-30和-1.20×10^-34 esu,而共轭桥为萘环的化合物4的β和γ值分别为54.22×10^-30和2.00×10^-34 esu,端部引入苯并环的化合物5的β和γ值增加幅度更大.对应的金属Ni(Ⅱ)配合物的β值增加较明显,为配体的1.7~10.8倍,γ值也有不同程度的增加.
基金ProjectsupportedbytheNationalNaturalScienceFoundationofChina (No .2 99730 10 )andtheKeyLabofSupramolecularStructureandMate rialofJilinUniversity .
摘要The second-order nonlinear optical (NLO) properties of a series of benzothiazole derivatives were studied by use of the ZINDO-SOS method. These chromophores are formed by a donor-π-bridge-acceptor system, based on a nitro group connected with benzothiazole as the acceptor and a hydroxyl-functional amino group as the donor. For the purpose of comparison, we also designed molecules in which nitrobenzene is an acceptor. The calculation results indicate that benzothiazole derivatives exhibit larger second-order polarizabilities than nitrobenzene derivatives. In order to clarify the origin of the NLO response of these chromophores, their electron properties were investigated as well. The benzothiazole derivatives are good candidates for application in electro-optical device due to their high optical nonlinearities, good thermal and photonic stability.
基金the National Natural Science Foundation of China (Nos. 20273023 and 90101026) and the Kay Laboratory for Supramolecular Structure and Material of Ji
摘要The first hyperpolarizabilities of a series of novel azulenic-barbituric acid chromophores have been studied by using 12 excitation wavelengths, ranging from 900 to 1907 nm. The dispersion relation of the first hyperpolariza-bilities of chromophores holds the same tendency as the experimental results. In addition, the static first hyperpo-larizability 0 of molecules was calculated by means of the Sum-Over-States (SOS) expression and the two-level formula respectively. The results show that these molecules possess large static first hyperpolarizabilities and the 0 value increases as the donor or acceptor strength enhances; the distorted degree of molecules has also an important influence on the 0 value.
基金Project supported by the National Natural Science Foundation of China (No. 29890210)
摘要The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been calculated. The influences of molecular structure, donor, acceptor and the frequency of external field on β and γ, and the relationship between γ and the number of thiophene rings (i. e. conjugated chain length) have been studied using INDO/SCI methods combined with sum-overstate (SOS) formula. The calculated results show that γ is proportional to 2.69 power of the chain length of the conjugated molecular bonds when the length is not quite long.
基金Project supported by the National Natural Science Foundation of China (Nos. 20273023 90101026) and the Key Laboratory for Supramolecular Structure and Material of Jilin University.
摘要We have theoretically investigated the one- and two-photon absorption properties of C60 and C70 using the ZINDO method. From the results it is suggested that the one-photon absorption spectra are in agreement with the experimental observations. It is found that the maximum TPA cross section of C70 is more than twice that of C60, which is consistent with the experimental results. A notable point is that the TPA process of C60 is different from that of C70 as well as other ordinary conjugated molecules.