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卟啉镍的电子结构及三阶非线性光学性质 总被引:1,自引:1,他引:1
用INDO/SDCI法研完了卟啉镍的电子结构、UV光谱和三阶非线性光学系数γ,发现该化合物中镍离子对γ的贡献很小,而卟啉环对γ的贡献则是主要的,且三阶非线性极化系数随配体共轭键数目的增加成指数增长. 相似文献
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具有非线性光学性质(NLO)的“推拉”型结构分子由于在光学通讯、电光器件和激光扫描等光电子领域中具有潜在的应用价值,近十几年已被广泛研究。这类分子的典型结构为D-π-A(D为电子给体,A为电子受体,π为共轭体系),容易发生分子内的电荷转移而具有大的分子超极化率,有机分子的结构与二阶非线性光学性质(SHG)的相关性在理论和实验方面已有研究,但不同取代位置的电子受体对SHG垢影响的报道则较少。 相似文献
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金属有机骨架(MOFs)材料因其可设计的结构以及灵活可控的配位模式,在三阶非线性光学(NLO)领域引起了广泛的关注。与液体分散状态相比,MOFs在固体状态下的三阶NLO性能更为重要,这不仅可以深入了解MOFs本身所固有的光学性能,还有助于实现MOFs在光学器件中的实际应用。然而,由于散射的存在和透光率的限制,单独的MOFs材料难以直接实现固体状态下的三阶NLO性能研究,将MOFs制备成具有较好光学透过性的薄膜是研究其NLO性能最为可行的一种策略。MOFs薄膜不仅很好地继承了MOFs所固有的三阶NLO性能,而且还结合了薄膜的高透光率以及灵活的机械性能。基于此,本文分析总结了MOFs薄膜的制备方法及其NLO性能研究方面的相关工作,并根据目前MOFs薄膜在三阶NLO性能方面的研究现状对其未来发展予以了展望。 相似文献
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金属有机骨架(MOFs)材料因其可设计的结构以及灵活可控的配位模式,在三阶非线性光学(NLO)领域引起了广泛的关注。与液体分散状态相比,MOFs在固体状态下的三阶NLO性能更为重要,这不仅可以深入了解MOFs本身所固有的光学性能,还有助于实现MOFs在光学器件中的实际应用。然而,由于散射的存在和透光率的限制,单独的MOFs材料难以直接实现固体状态下的三阶NLO性能研究,将MOFs制备成具有较好光学透过性的薄膜是研究其NLO性能最为可行的一种策略。MOFs薄膜不仅很好地继承了MOFs所固有的三阶NLO性能,而且还结合了薄膜的高透光率以及灵活的机械性能。基于此,本文分析总结了MOFs薄膜的制备方法及其NLO性能研究方面的相关工作,并根据目前MOFs薄膜在三阶NLO性能方面的研究现状对其未来发展予以了展望。 相似文献
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Yuzhen Zhao Zhenhua Li Qing Li Yang Zhao Ruijuan Yao Cheng Ma Yongming Zhang Dong Wang 《Molecules (Basel, Switzerland)》2022,27(15)
A high-yielding click reaction was used to synthesize a series of highly conjugated, symmetrical, as well as asymmetrical compounds with a benzene core. Cyclic voltammetry and ultraviolet/visible absorption spectroscopy were carried out, and proved that the side groups of the benzene derivatives played an important role in the energy gaps, and affected the third-order non-linear optical response. The maximum absorption wavelength of the series of benzene derivatives showed an obvious red-shift. Moreover, the addition of resilient electron-withdrawing groups significantly narrowed the energy levels as compared with precursors. The third-order nonlinear properties of this benzene derivative were tested by the Z-scan technique. The expected properties of this series of molecules were obtained, and it was found that the series of molecules undergoes a transition from reverse saturable absorption to saturable absorption, which has certain reference significance for a nonlinear optical field. 相似文献
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以氯化4-甲基-N-9-亚甲基蒽吡啶盐为原料,合成了一种新型的苯乙烯吡啶盐,通过红外、核磁共振氢谱、碳谱、电喷雾质谱、单晶X射线衍射等测试技术对化合物的结构进行了表征。单晶X射线衍射结果表明,该化合物属于单斜晶系,空间群为P21/c,晶胞参数a=1.255 7(1)nm,b=1.539(1)nm,c=2.220 2(8)nm,β=101.099(1)°,V=4.210 5(4)nm3,Z=4,Dc=1.159 g/cm3。用1 064 nm皮秒脉冲激光研究其三阶非线性光学特性,双光子吸收系数β=0.028 cm/GW,吸收截面为σ=8.68×10-48cm4.s.photon-1,表明目标化合物具有良好的三阶非线性光学性质。 相似文献
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N‐Annulated Perylene‐Substituted and Fused Porphyrin Dimers with Intense Near‐Infrared One‐Photon and Two‐Photon Absorption 下载免费PDF全文
Dr. Jie Luo Sangsu Lee Minjung Son Dr. Bin Zheng Prof. Kuo‐Wei Huang Qingbiao Qi Wangdong Zeng Dr. Gongqiang Li Prof. Dongho Kim Prof. Jishan Wu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(9):3708-3715
Fusion of two N‐annulated perylene (NP) units with a fused porphyrin dimer along the S0–S1 electronic transition moment axis has resulted in new near‐infrared (NIR) dyes 1 a / 1 b with very intense absorption (ε>1.3×105 M ?1 cm?1) beyond 1250 nm. Both compounds displayed moderate NIR fluorescence with fluorescence quantum yields of 4.4×10?6 and 6.0×10?6 for 1 a and 1 b , respectively. The NP‐substituted porphyrin dimers 2 a / 2 b have also been obtained by controlled oxidative coupling and cyclodehydrogenation, and they showed superimposed absorptions of the fused porphyrin dimer and the NP chromophore. The excited‐state dynamics of all of these compounds have been studied by femtosecond transient absorption measurements, which revealed porphyrin dimer‐like behaviour. These new chromophores also exhibited good nonlinear optical susceptibility with large two‐photon absorption cross‐sections in the NIR region due to extended π‐conjugation. Time‐dependent density functional theory calculations have been performed to aid our understanding of their electronic structures and absorption spectra. 相似文献
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合成了一个新的双光子吸收聚合引发剂,9-乙基-3-{2-[4-(2-吡啶基-4-乙烯基)-苯基]-乙烯基}-9氢咔唑 (EPVPVC),用1H NMR谱、13C NMR谱和元素分析进行了表征.测试了紫外吸收光谱、单光子荧光光谱、单光子荧光寿命、单光子荧光量子产率和双光子荧光光谱.量化计算结果表明,EPVPVC的双光子吸收截面为56.6×10-50 cm4·s·photon-1.在780 nm的飞秒脉冲激光激发下,EPVPVC发出较强的上转换荧光,荧光峰位于536 nm.用EPVPVC做引发剂,加入丙烯酸酯型齐聚物(cN120C80),在脉冲宽度为200 fs,重复频率为76 MHz,中心波长为780 nm 飞秒脉冲激光下,制作了一个三维周期性微结构.在理论计算的基础上,定性地探讨了其可能的聚合机理. 相似文献
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0IntroductionThereiscurrentlyintenseresearchinterestinde-velopingnewnonlinearmaterialswithhighthird-ordernonlinearopticaleffectsduetotheirpotentialapplica-tionsinanumberofimportanttechnologiesincludingopticalpowerlimitingforsensorprotection,opticalswitches,allopticalsignalprocessingandopticalcom-puting犤1~3犦.Metalcomplexeswithplanar,π-conjugatedtetradentateorbidentateligandareofparticularinterestbecausetheycontainbothelectronsthatarefreetomovewithintheπextendedsystemoftheligand… 相似文献
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He-Di Yang Mao-Yin Ran Wen-Bo Wei Prof. Xin-Tao Wu Prof. Hua Lin Prof. Qi-Long Zhu 《化学:亚洲杂志》2021,16(21):3299-3310
Infrared (IR) nonlinear optical (NLO) materials are the core devices to realize IR laser output, which are of vital importance in civilian and military fields. Non-centrosymmetric chalcogenide and pnictide compounds have already been widely accepted as favorable systems for IR-NLO materials. Compared to the extensively investigated IR-NLO chalcogenides during the past few decades, the research of non-centrosymmetric phosphides as IR-NLO materials is relatively scarce. In this frontier article, the recent progress of pnictides as emerging IR-NLO candidates has been highlighted based on the perspective of new crystal exploration. These IR-NLO pnictides recently reported were divided into three groups from binary to quaternary according to their chemical compositions. The synthetic methods, structural chemistry, and structure-activity relationships are analyzed and summarized in detail. Finally, current problems and the future development of this field are also proposed. 相似文献
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合成了反式-4-[N-(乙氧基羰基-4"-硝基苯基)-N'-乙基氨基]-4'-(二甲基氨 基)二苯乙烯(DMANHAS)和三个新有机化合物。用核磁、红外以及元素分析进行了表 征。测试了紫外吸收光谱、单光子荧光光谱和双光子荧光光谱。在800nm的飞秒脉 冲激光激发下,反式-4-(N-羟乙基-N'-乙基氨基)-4'-(二甲基氨基)二苯乙烯 (DMAHAS)和反式-4-(N-羟乙基-N'-乙基氨基)-4'-(二乙基氨基)二苯乙烯(DEAHAS) 均发出较强的蓝紫色上转换荧光,荧光峰分别位于436和440nm,而DMANHAS和反式- 4-[N-(乙氧基羰基-4"-硝基苯基)-N'-乙基氨基]-4'-(二乙基氨基)二苯乙烯 (DEANHAS)没有荧光。 相似文献
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Kutsenko A. S. Maloletov S. M. Kuchmii S. Ya. Lyakhovetskii V. R. Volkov V. I. 《Theoretical and Experimental Chemistry》2002,38(3):173-178
High third-order nonlinear optical susceptibility ((3)(;, –,)=3.4·10 –16 m2/V2) in the visible spectral range may be achieved in PVA composites with narrow-gap PbS semiconductor nanocrystals with a large exciton diameter. 相似文献
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Chen Cao Shu-Jin Bao Dr. Xiao-Yan Tang Ze-Ming Xu Chun-Yan Ni Prof. Dr. Jian-Ping Lang 《化学:亚洲杂志》2021,16(18):2674-2680
Reactions of (NH4)2WS4 with CuCN, CuCN/1,2-bis(4-pyridyl)propane (bppa) or [Cu(MeCN)4]PF6/bppa under different reaction conditions afforded a set of two- or three-dimensional W/Cu/S cluster-based coordination polymers including {[Et4N]2[WS4Cu4(μ-CN)2(μ-I)2]}n ( 1 ), [WS4Cu4(μ-CN)2(bppa)2]n ( 2 ) and {[WS4Cu4(bppa)4](PF6)2}n ( 3 ), respectively. Compound 2 can be readily formed from reaction of 1 with bppa under solvothermal conditions. Compounds 1 and 2 feature two-dimensional networks with a “sql” topology, while 3 possesses a two-fold interpenetrated three-dimensional net with a rare “reo” topology. Compounds 1 – 3 in DMF exhibited different third-order nonlinear optical responses, and they all showed a reverse saturable absorption while 2 held a strong self-focusing effect. 相似文献