刘永军
从事功能材料和天然药物化学方面的研究工作。
个性化签名
- 姓名:刘永军
- 目前身份:
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- 学位:
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学术头衔:
博士生导师, 中科院“百人计划”入选者
- 职称:-
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学科领域:
物理化学
- 研究兴趣:从事功能材料和天然药物化学方面的研究工作。
刘永军,男,1964年10月出生,山东省淄博市人,研究员。2001年7月毕业于山东大学化学与化工学院,获理学博士学位。2001年11月至2004年7月在加拿大Simon Fraser University 从事博士后研究。2004年7月回国后,任山东大学化学与化工学院教授,目前从事功能材料和天然药物化学方面的研究工作,2007年入选中国科学院“百人计划”。在国内外重要学术刊物上发表论文70余篇,2001年获山东大学未来之星奖学金;1998年山东省教委科技进步三等奖;1996山东省教委科技进步三等奖;1994年获山东省教委科技进步二等奖。
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878
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成果阅读
367
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成果数
7
刘永军, Yong-Jun Liu, Damien M. Waugh, and Hua-Zhong Yua)
Appl. Phys. Lett., Vol. 81, No.26, 23 December 2002,-0001,():
-1年11月30日
The electrical properties of hydrogen-terminated silicon (H-Si) surfaces were investigated by the assembly and testing of reliable and reproducible mercury-silicon junctions. When a H-Si surface is exposed to air under ambient conditions, the current density-bias voltage curve of the thus formed mercury-silicon junction initially maintains ohmic characteristics for a period of 8-12 h and then evolves to diode behavior. The current density substantially decreases, but can be recovered to a certain extent upon sonication in organic solvents. In agreement with infrared spectroscopic results, organic contamination of H-Si is suggested to play an important role in the transition of the electrical properties.
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刘永军, Ying LIU, Yu Hong GENG, Yong Jun LIU, *, Cheng Bu LIU
Chinese Chemical Letters Vol. 13, No.1, pp 45-48, 2002,-0001,():
-1年11月30日
The structures of several recently reported organometallic NLO chromophores, (thiophene) manganese tricarbonyl cations, were fully optimized at the DFT non-local (GGA) level. The calculated results show that the fragments 2-SC4H3CH=CHC6H4-R in these organometallic chromophores are not planar with dihedral angles of 42.2~59.8° between two aromatic rings, which are different from those of uncoordinated counterparts. Based on the DFT geometry optimization, the second-order nonlinear optical polarizabilities were calculated by using RPA method. The calculated results indicate that incorporation of Mn(CO)+ 3 unit with thiophene leads to a substantial increase in the second-order polarizability (β).
Organometallic chromophore,, nonlinear optical properties,, DFT method,, ZINDO,, (, thiophene), manganese tricarbonyl cation.,
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刘永军, Yongjun Liua, b, *, Ying Liub, Dongju Zhanga, Haiquan Hua, Chengbu Liua
Journal of Molecular Structure 570(2001)43-51,-0001,():
-1年11月30日
On the basis of the ZINDO program, we have designed a program to calculate the second-order nonlinear polarizabilitiesβlike, β0 andβµaccording to the sum-over-states (SOS) expression. A series of new 4-(dicyanomethylene)-2-methyl-6-(p-dithyla-mino-styryl)-4H-pyran (DCM) derivatives were designed and their electron spectra and nonlinear optical properties were studied. It is proposed that these compounds possess two important excited states close to each other in energy, both contri-buting to hyperpolarizability in an additive fashion; 4-(dicyanomethylene)-2,6-bis-(p-donor-styryl)-4H-pyran derivatives aremore nonlinear than 4-(dicyanomethylene)-2,6-bis-(p-donor-phenyl)-azo-4H-pyran derivatives. The high nonlinearities, good thermal stability and high transparency make them attractive candidates for second-order nonlinear applications such as electro-optic modulators and frequency doublers. © 2001 Elsevier Science B.V. All rights reserved.
Heterocyclic rings, (, Dicyanomethylene), -pyran derivatives, Second-order polarizability, Nonlinear optical properties, ZINDO-SOS
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刘永军, Yu-fang Zhoua'b'*, Yong-jun Liuc, Xian Zhaoa, Min-hu Jianga
Journal of Molecular Structure (Theochem) 545(2001)61-65,-0001,():
-1年11月30日
Based on DCM structure moiety, we have designed a series of symmetric (dicyanomethylene)-pyran derivatives in which benzene rings were replaced by thiophene rings. Their two-photon absorption (TPA) properties were studied by using a combination of intermediate neglect of differential overlap Hamiltonian with the configuration interaction technique combined with sum-over-states expression. The calculated results show that the TPA cross-sections are sensitive to molecular structure. The electron excessivity of heterocycle and double-bridge effect on TPA cross-sections is discussed.© 2001 Elsevier Science B.V. All rights reserved.
Organic chromophores, Optical properties, Two-photon properties, INDO/, CI, SOS
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刘永军, Yongjun Liua, b, *, Dongju Zhanga, Haiquan Hua, Chengbu Liua
Journal of Molecular Structure (Theochem) 545(2001)97-103,-0001,():
-1年11月30日
AM1 semiempirical calculation method was used to study the structures and electronic properties of N-methyl-2-(21-thiophene)-pyrrolo[3,4]C60 (MTPC) and N-methyl-pyrrolo[3,4]C60 (MPC). Geometry ptimization results indicate that MTPC possesses eight stable isomers (four pairs of enantiomers), nd among which, MTPC-1A, MTPC-3A, MTPC-1B, MTPC-3B correspond to the lowest total energies and they have larger dipole moments. The frontier molecular orbitals of C60 moiety dictated that of MTPC and MPC. For MTPC and MPC, there exists stronger intramolecular electron transfer, with C60 moiety as the electron acceptor while thiophene and pyrrolidine part are electron donors. Compared with that of N-methyl-pyrroloβ,4]C60 (MPC), the C60 moiety of MTPC isomers possesses less net charge. Based on the AM1 geometry optimiza-tion, the electronic spectra and second-order nonlinear optical polarizabilities (β) of MTPC and MPC were calculated by using INDO/SCI method combined with sum-over-states (SOS) expression. The calculated results reveal that there exist weak absorption peaks above 400 nm for MTPC and MPC. The thiophene-containing molecule (MTPC) exhibits good optical nonlinearity with the β values slightly less than that of MPC. For MTPC, β values vary with different isomers. When electron donor such as amino connected with thiophene, β values increase by one factor.
C60 derivatives, Electronic spectra, Second-order nonlinear optical properties, AM l, INDO/, SCI
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【期刊论文】氮杂联苯乙烯系列衍生物的二阶非线性光学性质的理论研究
刘永军, , 刘英, 赵显, 刘成卜
高等学校化学学报,2001,22(6):1016~1018,-0001,():
-1年11月30日
On the basis of ZINDO program, we have desig ned aprogram to calculate the nonlinear seco nd-order polarizabilit iesβijβk andβu according to the SOS equation. The second-order nonlinear optical properties of diazadistyrene derivatives were studied. The calculated result s reveal that the introduction of py rimidine does not inf luence the transpar ency but givea rise to large values of β. For the corresponding stilbene derivatives, the effect of the location of py rimidine on the values of βis greater.
氮杂联苯乙烯系列衍生物, 二阶非线性光学性质, ZINDO-SOS
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【期刊论文】Magentic coupling mechanism in singly bridged binuclear systemsx
刘永军, Haiquan Hua, b, Dongju Zhanga, Yongjun Liua, Chengbu Liua, *
Chemical Physics Letters 340(2001)370-375,-0001,():
-1年11月30日
The magnetic coupling mechanism in HHeH and OFe2CI2-6 systems has been investigated using the density functional theory with the broken symmetry approach. The approximately linear relationship between the coupling constant and the square of the energy difference of the singly occupied molecular obitals(MOs) can be expected for the slight change of structural parameters. By analyzing the magnetic interaction one conclusion has been drawn that the © -like interaction between the magnetic centers and bridging atom plays an important role in the magnetic coupling.
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