方奇
分子基光电功能材料的设计与合成、结构与性质的研究
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- 姓名:方奇
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学术头衔:
博士生导师,
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学科领域:
材料科学
- 研究兴趣:分子基光电功能材料的设计与合成、结构与性质的研究
方奇,男,山东大学晶体材料国家重点实验室教授,博士生导师。1956年3月生于北京,1982年毕业于山西大学化学系,1992年获南京大学无机化学专业博士学位。 从事材料化学和晶体学方面的教学和研究, 当前致力于分子基光电功能材料的设计与合成、结构与性质的研究。例如:非线性光功能分子的设计与合成,分子基半导体、导体和超导体的分子合成和晶体制备。
承担国家重点基础研究发展规划(973计划)一项,国家自然科学基金4项,教育部博士点基金2项,教育部高校骨干教师资助计划一项,山东省优秀中青年科研基金一项。先后获得山东省科技进步二等奖(首位)和 山东省自然科学一等奖(首位),并获得山东省有突出贡献的中青年专家的荣誉称号。培养博士10名,硕士3名,获山东省优秀博士论文奖一次,主笔或指导发表SCI论文百余篇,出版了47万字的著作《晶体学原理》。
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17
【期刊论文】Synthesis, structure, and conductivity of molecular conductor (PyEt)[Ni(dmit)2]2
方奇, FANG Qi, , XU Wen, LEI Hong, XUE Gang, CHEN Hongyu, XU Cuiying, JIA Chunyang & ZHANG Deqing
Vol. 46 No.6 SCIENCE IN CHINA (Series B) December 2003,-0001,():
-1年11月30日
A new electrical conductive crystal PyEt[Ni(dmit)2]2 (dmit=4,5-dimercapto-1,3-dithiole-2-thione) has been synthesized and its X-ray structure has been determined to be in monoclinic system, C2/c space group. In PyEt[Ni(dmit)2]2 crystal, the conducting component [Ni(dmit)2]0.5− is face-to-face packed forming molecular column along the c-direction, and these molecular columns are then side-by-side extended along the a-direction forming a kind of two-dimensional conducting sheet on (010). The measured conductivity at room temperature along a certain direction on (010) plane is 10 S cm−1. From 282 to 269 K, the crystal shows metallic behavior but changes to semiconductor below 269 K. Based on the measured crystal structure and calculated band structure, this conductor-semiconductor phase transformation can be primarily interpreted: The metallic conductivity is corresponding to the uniform molecular column and the atomic-lattice-chain structure of Ni chain, while the semi-conductive behavior to staggered molecular column and the atomic-zigzag-chain structure of Ni chain.
molecular conductor,, synthesis,, crystal structure,, energy band,, conductivity.,
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【期刊论文】Organic and Semiorganic Nonlinear Optical Materials**
方奇, By Min-hua Jiang* and Qi Fang
Adv. Mater. 1999, 11, No.13,-0001,():
-1年11月30日
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【期刊论文】Structure and electrical conductivity of BEDT-TTF/HgCl PTCE
方奇, Liu Zhi a, Fang Qi a, ), Yu Wen-Tao a, Chen Shen-Hao b, Jiang Min-Hua a, Zhang Bin c, Zhang Jin-Biao c, Zhu Dao-Ben c
Synthetic Metals 114(2000)243-250,-0001,():
-1年11月30日
A new BEDT-TTF BEDT-TTFsBis ethylenedithio.tetrathiafulvalene.-based cation radical salt BEDT-TTF.2HgCl3PTCE TCEs 1,1,2-trichloroethane.was synthesized by using oxidative electro-crystallization at a constant current. Its structure was determined by four-circle X-ray diffraction method. The crystal belongs to monoclinic system, C2 space group with the unit cell parameters of as39.236 (5). A°, bs6.676 (1) A°, cs14.881 (3). A°, bs95.58 2.0, Vs3879.4 12. A°(3), Zs4. The structure shows that the BEDT-TTF radicals are stacked to form columns along the c-axis and arranged side-by-side to form one-dimensional uniform chains along the b-axis. The one-dimensional polymer HgCl3.nny, together with neutral TCE molecules, is also along the b-axis. Cationic BEDT-TTF sheets and anionic HgCly3 sheets are sandwiched along the a-axis. The room temperature resistivity of the single crystal was measured to be 3.33 VPm on the bc-plane. Its resistivity–temperature curve demonstrates a semiconductor behavior with an activation energy of 0.308 eV.
BEDT-TTF salt, Electro-crystallization, Crystal structure, Conductivity
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方奇, FANG Qi , LEI Hong , CUI Yuezhi , HUANG Zhenli , XUE Gang , YU Wen-tao
Science in China Ser. B Chemistry 1(2005)1-7,-0001,():
-1年11月30日
Three s-triazine derivatives have been synthesized and their structures been de-termined. These are Compound I: 2,4-Dimethyl-6-(p-N, N-dimethylaminostyryl)-s-triazine (ab-breviated to NMe-1), Compound II: 2, 4-Dimethyl-6-(p-N, N-diethylaminostyryl)-s-triazine (to NEt-1), and Compound III: 2-Methyl-4, 6-bis(p-N, N-dimethylaminostyryl)-s-triazine (NMe-2). NMe-1 and NEt-1 molecules belong to the D-π-A type with a one-dimensional charge-transfer character. NMe-1 crystallize to centrosymmetric 1P space group, while NEt-1 to non-centro- sym- metric polar Cc space group with all of the molecular charge-transfer axes taking the same orientation. Under the irradiation of 1064 nm fundamental laser, NEt-1 powder crystals radiate a 2-order harmonic light with an intensity 46.8 times that of urea. The Λ typed NMe-2 molecule, which has a two-dimensional charge-transfer character, crystallize to polar P21 space group. Its powder crystals exhibit a 2-order harmonic intensity 46.2 times that of urea. The quantum chemical calculations and tensor analyses have been carried out to reveal the dependence of the macro 2-order nonlinear optical (NLO) efficiency on the micro 2-order NLO coefficients (β) and on the crystalline packing styles.
s-triazine derivatives, synthesis, structure, SHG intensities of crystals, β values of molecules
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方奇, Zhi-Qiang Liu, Qi Fang, * Du-Xia Cao, Dong Wang, and Gui-Bao Xu
Inorganic Chemistry Communications 7(2004)1157-1160,-0001,():
-1年11月30日
Three new A-π-A-type compounds with trivalent boron, protected by two mesityl groups, as electron acceptor have been synthesized and investigated together with their two diphenylamino-ended D-ð-D analogues. These boranes exhibit large two-photon absorption cross sections and high fluorescence quantum yields.
Palladium complex, Synthesis, X-ray crystal structure, Conductivity
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【期刊论文】Synthesis and characterization of highly conducting PyH[Pd(dmit)2]2 crystal
方奇, Qi Fang a, b, *, Wen Xu a, Hong Lei c, Cui-Ying Xu d, Bin Zhang d, Dao-Ben Zhu d
Inorganic Chemistry Communications 7(2004)1157-1160,-0001,():
-1年11月30日
A new molecular conductor PyH[Pd(dmit)2]2 (PyH=pyridinium, dmit=2-thioxo-1,3-dithiole-4,5-dithiolato) has been synthesized and structurally investigated. The room temperature conductivity at a certain direction on (001) plane was measured to be as high as a 2
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方奇
,-0001,():
-1年11月30日
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方奇, Du Xia Cao, Zhi Qiang Liu, Qi Fang *, Gui Bao Xu, Gang Xue, Guo Qun Liu, Wen Tao Yu
Journal of Organometallic Chemistry 689(2004)2201-2206,-0001,():
-1年11月30日
Several donor-p-donor (D-p-D), acceptor-p-acceptor (A-p-A), and donor-p-acceptor (D-p-A) types of organic compounds with fluorene as p bridge and dimesitylboryl group as electron acceptor, which show strong two-photon excited blue fluorescence, have been synthesized and structurally investigated. The symmetric A-p-A type of compound exhibits the shortest wavelength of twophoton excited fluorescence (TPEF) at λem=405 nm under the excitation of λex=730nm; the unsymmetric D-p-A type of compound with diphenylamino as donor exhibits the most intense TPEF at blue region (λem=484 nm) with a two-photon absorption cross-section of 425GM under λex=800nm.
Dimesitylboryl, Two-photon excited fluorescence, X-ray structure
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方奇, Yue-zhi Cui, a, b Qi Fang, *a, c Zhen-li Huang, d Gang Xue, a Gui-bao Xua and Wen-tao Yua
J. Mater. Chem., 2004, 14, 2443-2449,-0001,():
-1年11月30日
three-branched octupolar compound, 2,4,6-tris[2-(4-N,N-diethylamino)phenylethenyl]-1,3,5-s-triazine (compound III), as well as its one-and two-branched analogues (compounds I and II respectively) have been synthesized. The structures of I and II have been determined by X-ray diffraction. The linear and nonlinear spectra of these compounds regularly vary: (1) the spectral positions (lmax values) of the linear absorption, the single-photon excited fluorescence (SPEF) and the two-photon excited fluorescence (TPEF) show regular redshifts when the branch number increases from 1 to 3; (2) the spectral intensities, including the linear absorbance emax and the two-photon absorption cross-section s, the SPEF and the TPEF intensities are all increased significantly when going from I to III. The values of emax/MW and s/MW (of compounds I, II and III) vary with the ratios of 1.0: 1.3: 1.7 and 1.0: 1.4: 1.3, respectively. All the photophysical data indicate that by incorporating more branches into the triazine ring, the linear and nonlinear optical responses have been significantly enhanced, and that the spectral behaviour of II is closer to that of III, while more different from that of I. The single-branched compound I crystallizes in the noncentrosymmetric polar space group Cc. Its crystalline powder sample shows remarkable macro second-order nonlinear response with a SHG intensity of 46.8 times that of urea under a fundamental picosecond Nd: YAG laser beam (1064 nm). An important factor of such a large SHG intensity is that all the molecular dipoles take the same-oriented packing style that makes the crystal maximally polarized, fulfilling the optimization in the sense of crystal engineering.
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方奇, Yan Ren, a Qi Fang, *a Wen-Tao Yu, a Hong Lei, a Yu-Peng Tian, a Min-Hua Jiang, a Qing-Chuan Yang b and Thomas C. W. Mak b
J. Mater. Chem., 2000, 10, 2025-2030,-0001,():
-1年11月30日
We have synthesized two new organic salts, trans-4-[p-(N-hydroxyethyl-N-methylamino)styryl]-Nmethylpyridinium toluene-p-sulfonate (abbreviated as HMASPS) and trans-4-[p-(N-hydroxyethyl-Nethylamino) styryl]-N-methylpyridinium toluene-p-sulfonate (abbreviated as HEASPS). X-Ray iffraction analyses reveal that HMASPS crystal belongs to the P21/n space group, with water olecules co-crystallized in the crystal and forming the monohydrate with the formula of C17H21N2Oz?C7H7O3S2?H2O, while HEASPS belongs to the P1
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