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Implications of Nitrogen Doping on Geometrical and Electronic Structure of the Fullerene dimers

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Chinese Journal of Chemistry 2021年第1期39卷 93-98页

作者： Yin Su Zuo-Chang Chen Han-Rui Tian Yun-Yan Xu Qianyan Zhang Su-Yuan Xie Lan-Sun Zheng State Key Lab for Physical Chemistry of Solid Surfaces iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005China

Because of its unsaturated bonds,C_(60) is susceptible to polymerize into *** implications of nitrogen doping on the geometrical and electronic structure of C_(60) dimers have been ambiguous for years.A quarter-centur... 详细信息

关键词： Fullerenes dimers Structure elucidation Density functional calculations Crystallographic structure

Protective effects of lipoic acid-niacin dimers against blue light-induced oxidative damage to retinal pigment epithelium cells

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International Journal of Ophthalmology(English edition) 2019年第8期12卷 1262-1271页

作者： Xiu-Lan Zou Yong-Zhen Yu Hong-Hua Yu Guan-Feng Wang Rong-Biao Pi Zhe Xu Chu Zhang Wen-Jie Zhou Dan-Dan Li Xuan-Ge Chen Yu-Ping Zou Department of Ophthalmology General Hospital of SouthernTheatre Command of PLAGuangzhou510010GuangdongProvinceChina Department of Ophthalmology Guangdong ProvincialPeople’s HospitalGuangzhou510000Guangdong ProvinceChina Department of Ophthalmology Third Affiliated Hospitalof Guangzhou Medical UniversityGuangzhou510000Guangdong ProvinceChina School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhou510000Guangdong ProvinceChina Department of Ophthalmology the First Affiliated HospitalGuangdong Pharmaceutical UniversityGuangzhou510000Guangdong ProvinceChina Zhongshan Ophthalmic Centre of Sun Yat-sen University Guangzhou510000Guangdong ProvinceChina

AIM: To evaluate the protective effects of lipoic acid-niacin(N2 L) dimers against blue light(BL)-induced oxidative damage to human retinal pigment epithelium(hRPE) cells in ***: h RPE cells were divided into a control group(CG), a BL group, an N2 L plus BL irradiation group, an α-lipoic acid(ALA) plus BL group, an ALA-only group, and an N2 L-only group. hRPE cellular viability was detected by performing 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium(MTT) bromide assays, and apoptosis was evaluated by annexin-V-PE/7-AAD staining followed by flow cytometry. Ultrastructural changes in subcellular organelles were observed by transmission electron microscopy. Reactive oxygen species formation was assayed by flow cytometry. The expression levels of the apoptosis-related proteins BCL-2 associated X protein(BAX), B-cell leukmia/lymphoma 2(BCL-2), and caspase-3 were quantified by Western blot ***: BL exposure with a light density of 4±0.5 mW/cm2 exceeding 6 h caused hRPE toxicity, whereas treatment with a high dose of N2 L(100 mol/L) or ALA(150 mol/L) maintained cell viability at control levels. BL exposure caused vacuole-like degeneration, mitochondrial swelling, and reduced microvillus formation;however, a high dose of N2 L or ALA maintained the ultrastructure of hRPE cells and their organelles. High doses of N2 L and ALA also protected hRPE cells from BL-induced apoptosis, which was confirmed by Western blot analysis: BCL-2 expression significantly increased, while BAX and caspase-3 expression slightly decreased compared to the ***: High-dose N2 L treatment(>100 mol/L) can reduce oxidative damage in degenerating hRPE cells exposed to BL with an efficacy similar to ALA.

关键词： lipoic acid-niacin dimers retinal pigment epithelium cell lipoic acid oxidative stress reactive oxygen species apoptosis

Synthesis and photochromism of dimers of 4,5- diaryl-2-(2,5-dimethylthiophen-3-yl)imidazolyl

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Chinese Journal of Chemistry 1997年第6期15卷 553-555页

作者： Bai, JQ Han, XC Wang, YM Meng, JB Nankai Univ Dept Chem Tianjin 300071 Peoples R China

4,5-Diphenyl, 4,5-di(4-methylphenyl), 4,5-di(4-methoxyphenyl)-2-(2,5-dimethylthiophen-3-yl)imidazoles were synthesized. Oxidation of the obtained imidazoles with potassium ferricyanide in water-alcohol solution of alkali gave the corresponding dimers. The structures were characterized by IR, H-1 NMR, mass spectroscopy and elemental analysis. The dimers showed photochromism in solution on irradiation.

关键词： synthesis imidazoles dimers photochromism

Photophysical Properties of Perylenetetracarboxylic Diimide dimers with Slipped “Face-to-Face” Stacked Structure and Different Bay Substitutions

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Journal of Materials Science and Chemical Engineering 2016年第6期4卷 1-8页

作者： Heyuan Liu Xiyou Li College of Science China University of petroleum (East China) Qingdao China

A series of perylenetetracarboxylic diimides (PDIs) dimers with slipped “face-to-face” stacked structure and different substituents at the bay positions have been synthesized and the molecular structures are characterized by 1H NMR, MALDI-TOF and elemental analysis. And different substituents at the bay positions of the PDI ring bring about various steric hindrances. These different steric hindrances have caused significant differences on the absorption and emission spectra. The correlation between the photophysical properties and the molecular structure is discussed.

关键词： Slip-Stacked dimers PDI Photophysical-Properties

A post-cyclotetramerization strategy towards novel binuclear phthalocyanine dimers

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A post-cyclotetramerization strategy towards novel binuclear...

d-limonene prevents ultraviolet irradiation:Induced cyclobutane pyrimidine dimers in Skh1 mouse skin

中国化学会第八届全国配位化学会议

作者： Kang Wang Houhe Pan Jianzhuang Jiang Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials Department of Chemistry University of Science and Technology Beijing

It is well known that investigation over the functionalities of n-conjugated phthalocyanine oligomers towards applications has been retarded due to the lack of effective pathway for their synthesis and isolation,which in turn resulted in only limited number of n-conjugated phthalocyanine dimeric/trimeric species reported thus *** a result,developing new synthesis strategy besides cyclotetramerization towards new type of n-conjugated phthalocyanine oligomers becomes highly desired in this ***,a new and efficient post-cyclotetramerization strategy was developed for the synthesis of binuclear phthalocyanine dimers for the first time,resulting in the isolation and characterization of unprecedented type of binuclear phthalocyanine dimeric compounds sharing one common pyrazine moiety in an unexpected good yield as high as 72%,paving a new way towards novel conjugated oligomeric phthalocyanine derivatives with various application potentials.

关键词： phthalocyanine dimers post-cyclotetramerization synthesis

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World Journal of Dermatology 2014年第3期3卷 64-72页

作者： Ahmed N Uddin Feng Wu Ivica Labuda Kam-Meng Tchou-Wong Fredric J Burns Department of Environmental Medicine New York University School of Medicine Tuxedo NY 10987 United States

AIM: To establish whether d-limonene can protect against induction of cyclobutane pyrimidine dimers(CPDs) and sunburn in ultraviolet irradiation(UVR) irradiated mouse skin. METHODS: The d-limonene was given in 4 daily oral 20 μL aliquots at different concentrations as follows: 100%, 10% or 1% in liponate and 100% liponate as control. One day after the final d-limonene treatment, the mice were anesthetized with i.p. sodium pentobarbital and placed in boxes to allow a rectangular(2 cm × 4 cm) region of dorsal skin to be irradiated with a single, ultraviolet radiation dose of 1.5 kJ /m2. Skin samples from UVR irradiated area were obtained at 5 min after UVR exposure for CPD detection, at 6 d after UVR exposure, skin samples were obtained for in situ analysis for N-myc downstream regulating gene 1(NDRG1)(a stress response gene), proliferating cell nuclear antigen(PCNA)(an S-phase marker) and filaggrin(a barrier integrity gene). Based on immunohistochemistry staining, the number of CPD, NDRG1 and PCNA positive cells, as well as unstained cells was counted in 3 different individually selected areas and percentage of positive cells was established. RESULTS: CPD reduction occurred as follows: liponate only-none; 1% d-limonene-54.3% reduction of CPDs; 10% d-limonene-73.4% reduction of CPDs; 100% d-limonene-86.1% reduction of CPDs, the latter equivalent to a UV dose of only 0.21 k J/m2. Sunburn was also dose-dependently reduced by d-limonene. The NDRG1 protein was strongly induced by UVR(70.0% ± 10.4% positive cells), but 1% d-limonene reduced the response to 64.6% ± 9.2%, 10% d-limonene reduced the response to 16.2% ± 3.4% and 100% d-limonene reduced the response to 6.3% ± 1.7%. Similarly, PCNA was 52.4% ± 9.9% positive in UVR exposed skin, and 1% d-limonene reduced it to 42.9% ± 8.1%, 10% d-limonene reduced it to 36.2% ± 6.7% and 100% d-limonene reduce it to 13.8% ± 3.4%. NDRG1 and PCNA were increased by d-limonene or UVR separately, but combined they produced less than eit

关键词： Sunburn Ultraviolet irradiation d-limonene Cyclobutane pyrimidine dimers N-myc downstream regulating gene 1 Proliferating cell nuclear antigen

Transport of nanodimers through chemical microchip

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Communications in Theoretical Physics 2020年第1期72卷 130-134页

作者： Shun Zhan Ru-Fei Cui Li-Yan Qiao Jiang-Xing Chen Department of Physics Hangzhou Dianzi UniversityHangzhou310018China Department of Physics Zhejiang UniversityHangzhou310018China

We propose a new microfluid chip for transporting micro and nano *** device consists of chemical stripe pathways full of fuel species,which can be realized in experiments by chemical surface reactions that form spatiotemporal patterns.A mesoscopic model is constructed to simulate the transport dynamics of nanodimers passing through the *** is found that the increases of the volume fraction and radius of the dimer both decrease the first reach time although the underlying mechanisms are different:the volume fraction affects the probability of touching and entering the chip while the radius determines the self-propulsion within the *** transport efficiency is influenced by the size of the particles.

关键词： microchip catalytically sphere dimers chemical pathway multiparticle collision dynamics transport

Ab initio configuration interaction study of the ground and low-lying excited states of ZnCd

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Chinese Optics Letters 2007年第4期5卷 187-190页

作者：高峰杨传路董永绵 Department of Physics Ludong University

The multi-reference configuration interaction （MRCI） electronic energy calculations have been carried out on the ground state （X^1∑） as well as three low-lying excited states （3^∑, 1^∏, 3^∏） of ZnCd dimer. Potential energy curves （PECs） are therefore generated and fitted to the analytical potential energy functions （APEFs） using the Murrel-Sorbie （MS） potential function. Based on the PECs, the vibrational levels of each state are determined by solving Schroedinger equation of nuclear motion, and corresponding spectroscopic parameters are accurately calculated using the APEFs. The present values of spectroscopic parameters including equilibrium positions and dissociation energies are compared with other theoretical reports available at present.

关键词： Calculations dimers Ground state Potential energy functions Schrodinger equation

Spin Dynamics of Supramolecular Dimer [Mn4]2 Interacting With a Spin-polarized Electron

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Chinese Physics Letters 2004年第4期21卷 598-600页

作者：张国锋高迎芳殷雯梁九卿严启伟 StateKeyLaboratoryofMagnetism InstituteofPhysicsandCenterforCondensedMatterPhysicsChineseAcademyofSciencesBeijing100080 InstituteofTheoreticalPhysics ShanxiUniversityTaiyuan030006

A new family of the supramolecular antiferromagnetically exchange-coupled dimer of single-molecules magnets, [Mn4]2, really behave as a quantum mechanical coupled system and can be used for quantum computation [Tiron et al (2003) Phys. Rev. Lett. 91 227203]. We study the time evolution of [Mn4]2 dimer interacting with an injected electron by solving the time-dependent Schrodinger equations. We find that the variations of [Mn4]2 dimer magnetization and the electron spin crucially depend on the exchange interaction strength. Time evolution of the entanglement between the injected electron and supramolecular dimer [Mn4]2 is evaluated. It is observed that entanglement oscillates in time and is closely related to the spin variation of injected electron. From these characteristics the technique for the reversing and read-out of supramolecular dimer [Mn4]2 spin states is suggested.

关键词： ELECTRON INJECTION Entanglement reversing spin dynamics supramolecular injected Electrons New families single molecule dimers