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排序方式: 共有407条查询结果,搜索用时 31 毫秒
91.
92.
Xuefeng Lu Dongyue An Yi Han Ya Zou Yanjun Qiao Ning Zhang Dongdong Chang Jishan Wu Yunqi Liu 《Chemical science》2021,12(11):3952
A cyclopenta-fused macrocyclic tetraradicaloid, MC4-S, containing alternating phenanthrene (Phen) and dibenzo[b,d]thiophene (DBTh) units was synthesized and isolated in single-crystal form. Compared with its all-carbon isoelectronic structure, CPTP-M, the incorporation of two sulfur atoms leads to a smaller radical character and a larger singlet–triplet energy gap. X-ray crystallographic analysis reveals that the spin–spin coupling through the DBTh unit is stronger than that through the Phen moiety. In addition, the electron-rich sulfur atoms also raise the energies of both the HOMO and LUMO in MC4-S, but the overall optical and electronic energy gaps are close to that of the CPTP-M. MC4-S displays global anti-aromaticity according to the NMR measurements and theoretical calculations (NICS, ACID and 2D ICSS), with a 36π ring current circuit along the all-carbon periphery excluding the two sulphur atoms. Its dication becomes globally aromatic due to the existence of a dominant 34π-conjugation pathway. This study sheds some light on the effect of heteroatoms on the electronic properties of open-shell polyradicaloids.The first member of sulfur-heterocycloarene neutral tetraradicaloids, MC4-S, was synthesized in crystalline form, which displays strong global anti-aromaticity and unique properties. 相似文献
93.
对微量元素与恶性肿瘤关系的新认识 总被引:2,自引:0,他引:2
微量元素与恶性肿瘤关系是当前十分引人注目的研究课题.MEDLINE数据库显示.近5年中硒、锌、铜与肿瘤关系的文章最多.微量元素与恶性肿瘤相关性有三种可能,即微量元素的丰缺是恶性肿瘤的结果.是肿瘤发生的条件因素或病因.微量元素之间的关系相当复杂.既拮抗。又协同,微量元素的研究刚起步.取样和检测方法等均需标准化.其与恶性肿瘤的发生和发展的机理更需积极研究. 相似文献
94.
CaxSr1—xS:Bi,Tm,Cu和CaS:Eu荧光材料的研究 总被引:11,自引:0,他引:11
所作的一部分工作是对长余辉的荧光材料CaxSr1-xSBi,Tm,Cu(x=0,0.75,1)进行了研究.CaS和SrS两种基质材料高温互溶后,因为基质的晶体微结构上的变化引起Bi3+离子荧光效应的变化,即发光的发射波数发生改变.另一部分工作是对CaSEu加入陷阱机制后发光效应的研究.新的陷阱机制的引进,使得其余辉效应有较大的延长. 相似文献
95.
96.
Yanyong Wang Yiqiong Zhang Zhijuan Liu Chao Xie Shi Feng Dongdong Liu Prof. Mingfei Shao Prof. Shuangyin Wang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(21):5961-5965
Layered double hydroxides (LDHs) with two-dimensional lamellar structures show excellent electrocatalytic properties. However, the catalytic activity of LDHs needs to be further improved as the large lateral size and thickness of the bulk material limit the number of exposed active sites. However, the development of efficient strategies to exfoliate bulk LDHs into stable monolayer LDH nanosheets with more exposed active sites is very challenging. On the other hand, the intrinsic activity of monolayer LDH nanosheets can be tuned by surface engineering. Herein, we have exfoliated bulk CoFe LDHs into ultrathin LDH nanosheets through Ar plasma etching, which also resulted in the formation of multiple vacancies (including O, Co, and Fe vacancies) in the ultrathin 2D nanosheets. Owing to their ultrathin 2D structure, the LDH nanosheets expose a greater number of active sites, and the multiple vacancies significantly improve the intrinsic activity in the oxygen evolution reaction (OER). 相似文献
97.
98.
A scheme is proposed for generating quantum states of atomic ensemble. In this scheme, a beam of three-level atoms in the Λ configuration is trapped in a cavity, then squeezed vacuum state and squeezed coherent state of the atomic ensemble are prepared by choosing different initial states of the system. The scheme is based on the off-resonant interaction between the atom and cavities, so the high-level of the atom is eliminated adiabatically. 相似文献
99.
100.
Yuewei Zhang Dongdong Zhang Jinbei Wei Xiangchen Hong Yang Lu Deping Hu Guomeng Li Ziyang Liu Yang Chen Lian Duan 《Angewandte Chemie (International ed. in English)》2020,59(40):17499-17503
Pure green emitters are essential for realizing an ultrawide color gamut in next‐generation displays. Herein, by fusing the difficult‐to‐access aza‐aromatics onto B (boron)–N (nitrogen) skeleton, a hybridized multi‐resonance and charge transfer (HMCT) molecule AZA‐BN was successfully synthesized through an effective one‐shot multiple cyclization method. AZA‐BN shows pure green fluorescence with photoluminance quantum yield of 99.7 %. The corresponding green device exhibits a maximum external quantum efficiency and power efficiency of 28.2 % and 121.7 lm W?1, respectively, with a full width half maximum (FWHM) of merely 30 nm and Commission Internationale de l'Eclairage (CIE) coordinate y of 0.69, representing the purest green bottom‐emitting organic light‐emitting diode. 相似文献