共查询到20条相似文献,搜索用时 15 毫秒
1.
Huapeng Liu Zhuoqun Lu Dr. Zuolun Zhang Prof. Dr. Yue Wang Prof. Dr. Hongyu Zhang 《Angewandte Chemie (International ed. in English)》2018,57(28):8448-8452
The study of elastic organic single crystals (EOSCs) has emerged as a cutting‐edge research of crystal engineering. Although a few EOSCs have been reported recently, those suitable for optical/optoelectronic applications have not been realized. Here, we report an elastic crystal of a Schiff base, (E)‐1‐(4‐(dimethylamino)phenyl)iminomethyl‐2‐hydroxyl‐naphthalene. The crystal is highly bendable under external stress and able to regain immediately its original straight shape when the stress is released. It displays bright orange–red emission with a high fluorescence quantum yield of 0.43. Intriguingly, it can serve as a low‐loss optical waveguide even at the highly bent state. Our result highlights the feature and utility of “elasticity” of organic crystals. 相似文献
2.
Dr. Jiang Peng Jiakun Bai Xiumian Cao Jieting He Prof. Weiqing Xu Dr. Junhui Jia 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(64):16036-16042
Elastic organic single crystals with light-emitting and multi-faceted bending properties are extremely rare. They have potential application in optical materials and have attracted the extensive attention of researchers. In this paper, we reported a structurally simple barbituric derivative DBDT , which was easily crystallized and gained long needle-like crystals (centimeter-scale) in DCM/CH3OH (v/v=2/8). Upon applying or removing the mechanical force, both the (100) and (040) faces of the needle-like crystal showed reversible bending behaviour, showing the nature of multi-faceted bending. The average hardness (H) and elastic modulus (E) were 0.28±0.01 GPa and 4.56±0.03 GPa for the (040) plane, respectively. Through the analysis of the single crystal data, it could be seen that the van der waals (C−H⋅⋅⋅π and C−H⋅⋅⋅C), H-bond (C−H⋅⋅⋅O) and π⋅⋅⋅π interactions between molecules were responsible for the generation of the crystal elasticity. Interestingly, elastic crystals exhibited optical waveguide characteristics in straight or bent state. The optical loss coefficients measured at 627 nm were 0.7 dBmm−1 (straight state) and 0.9 dBmm−1 (bent state), while the optical loss coefficient (α) were 1.5 dBmm−1 (straight state) and 1.8 dBmm−1 (bent state) at 567 nm. Notably, the elastic organic molecular crystal based on barbituric derivative could be used as the candidate for flexible optical devices. 相似文献
3.
Zhuoqun Lu Yuping Zhang Hao Liu Kaiqi Ye Wentao Liu Hongyu Zhang 《Angewandte Chemie (International ed. in English)》2020,59(11):4299-4303
Bendable (elastic and plastic) organic single crystals have been widely studied as emerging flexible materials with highly ordered packing structures. However, even though manifold bendable organic crystals have been recently reported, most of them bend in response to only one stimulus. Herein, we report an organic single crystal of (Z)‐4‐(1‐cyano‐2‐(4‐(dimethylamino)phenyl)vinyl)benzonitrile, which bends under external stress (physical process) and also hydrochloric acid atmosphere (chemical process). This observation indicates that a single organic crystal, whose structure has been optimized simultaneously at both the molecular and supramolecular levels, may display multiple crystal‐bending modes. Furthermore, the crystals exhibit bright orange‐yellow emission and can serve as an active low‐loss optical waveguide in both the straight and the bent state, which indicates a potential optical application. 相似文献
4.
Bin Liu Zhuoqun Lu Baolei Tang Hao Liu Huapeng Liu Prof. Dr. Zuolun Zhang Prof. Dr. Kaiqi Ye Prof. Dr. Hongyu Zhang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(51):23317-23321
With the increasing popularity and burgeoning progress of space technology, the development of ultralow-temperature flexible functional materials is a great challenge. Herein, we report a highly emissive organic crystal combining ultralow-temperature elasticity and self-waveguide properties (when a crystal is excited, it emits light from itself, which travels through the crystal to the other end) based on a simple single-benzene emitter. This crystal displayed excellent elastic bending ability in liquid nitrogen (LN). Preliminary experiments on optical waveguiding in the bent crystal demonstrated that the light generated by the crystal itself could be confined and propagated within the crystal body between 170 and −196 °C. These results not only suggest a guideline for designing functional organic crystals with ultralow-temperature elasticity but also expand the application region of flexible materials to extreme environments, such as space technology. 相似文献
5.
Dr. Mari Annadhasan Abhijeet R. Agrawal Surojit Bhunia Vuppu Vinay Pradeep Prof. Sanjio S. Zade Prof. C. Malla Reddy Prof. Rajadurai Chandrasekar 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(33):13956-13962
We present the one-dimensional optical-waveguiding crystal dithieno[3,2-a:2′,3′-c]phenazine with a high aspect ratio, high mechanical flexibility, and selective self-absorbance of the blue part of its fluorescence (FL). While macrocrystals exhibit elasticity, microcrystals deposited at a glass surface behave more like plastic crystals due to significant surface adherence, making them suitable for constructing photonic circuits via micromechanical operation with an atomic-force-microscopy cantilever tip. The flexible crystalline waveguides display optical-path-dependent FL signals at the output termini in both straight and bent configurations, making them appropriate for wavelength-division multiplexing technologies. A reconfigurable 2×2-directional coupler fabricated via micromanipulation by combining two arc-shaped crystals splits the optical signal via evanescent coupling and delivers the signals at two output terminals with different splitting ratios. The presented mechanical micromanipulation technique could also be effectively extended to other flexible crystals. 相似文献
6.
Mari Annadhasan Abhijeet R. Agrawal Surojit Bhunia Vuppu Vinay Pradeep Sanjio S. Zade C. Malla Reddy Rajadurai Chandrasekar 《Angewandte Chemie (International ed. in English)》2020,59(33):13852-13858
We present the one‐dimensional optical‐waveguiding crystal dithieno[3,2‐a:2′,3′‐c]phenazine with a high aspect ratio, high mechanical flexibility, and selective self‐absorbance of the blue part of its fluorescence (FL). While macrocrystals exhibit elasticity, microcrystals deposited at a glass surface behave more like plastic crystals due to significant surface adherence, making them suitable for constructing photonic circuits via micromechanical operation with an atomic‐force‐microscopy cantilever tip. The flexible crystalline waveguides display optical‐path‐dependent FL signals at the output termini in both straight and bent configurations, making them appropriate for wavelength‐division multiplexing technologies. A reconfigurable 2×2‐directional coupler fabricated via micromanipulation by combining two arc‐shaped crystals splits the optical signal via evanescent coupling and delivers the signals at two output terminals with different splitting ratios. The presented mechanical micromanipulation technique could also be effectively extended to other flexible crystals. 相似文献
7.
Wenyong Jia Qian Wang Prof. Huifang Shi Prof. Zhongfu An Prof. Wei Huang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(20):4437-4448
Ultralong organic phosphorescence (UOP) of metal-free organic materials has received considerable attention recently owing to their long-lived emission lifetimes, and the fact that they present an attractive alternative to persistent luminescence in inorganic phosphors. Enormous research effort has been devoted on improving UOP performance in metal-free organic phosphors by promoting the intersystem crossing (ISC) process and suppressing the non-radiative decay of triplet state excitons. This minireview summarizes the recent advances in the rational approaches for manipulating the UOP properties of small molecular crystals, such as phosphorescence lifetime, efficiency, and emission colors. Finally, the present challenges and future development of this field are proposed. This review will provide a guideline to rationally design more advanced metal-free organic phosphorescence materials for potential applications. 相似文献
8.
Dr. Soumyajit Ghosh Manish Kumar Mishra Sourabh B. Kadambi Prof. Upadrasta Ramamurty Prof. Gautam R. Desiraju 《Angewandte Chemie (International ed. in English)》2015,54(9):2674-2678
The intermolecular interactions and structural features in crystals of seven halogenated N‐benzylideneanilines (Schiff bases), all of which exhibit remarkable flexibility, were examined to identify the common packing features that are the raison d’être for the observed elasticity. The following two features, in part related, were identified as essential to obtain elastic organic crystals: 1) A multitude of weak and dispersive interactions, including halogen bonds, which may act as structural buffers for deformation through easy rupture and reformation during bending; and 2) corrugated packing patterns that would get interlocked and, in the process, prevent long‐range sliding of molecular planes. 相似文献
9.
Xiuhong Pan Linfeng Lan Liang Li Panče Naumov Hongyu Zhang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2024,136(15):e202320173
Organic single crystals quickly emerge as dense yet light and nearly defect-free media for emissive elements. Integration of functionalities and control over the emissive properties is currently being explored for a wide range of these materials to benchmark their performance against organic emissive materials diluted in powders or films. Here, we report mechanically flexible emissive chiral organic crystals capable of an unprecedented combination of fast, reversible, and low-fatigue responses. UV-excited single crystals of both enantiomers of the material, 4-chloro-2-(((1-phenylidene)imino)methyl)phenol, exhibit a drastic yet reversible change in the emission color from green to orange-yellow within a second and can be cycled at least 2000 times. The photoresponse was found to depend strongly on the excitation intensity and temperature. Combining chirality, mechanical compliance, rapid emission switching, multiple responses, and writability by UV light, this material provides a unique and versatile platform for developing organic crystal-based materials for on-demand signal transfer, information storage, and cryptography. 相似文献
10.
2D Organic Photonics: An Asymmetric Optical Waveguide in Self‐Assembled Halogen‐Bonded Cocrystals 下载免费PDF全文
Ming‐Peng Zhuo Yi‐Chen Tao Dr. Xue‐Dong Wang Dr. Yuchen Wu Dr. Shuo Chen Prof. Liang‐Sheng Liao Prof. Lei Jiang 《Angewandte Chemie (International ed. in English)》2018,57(35):11300-11304
Anisotropic organic molecular construction and packing are crucial for the optoelectronic properties of organic crystals. Two‐dimensional (2D) organic crystals with regular morphology and good photon confinement are potentially suitable for a chip‐scale planar photonics system. Herein, through the bottom‐up process, 2D halogen‐bonded DPEpe‐F4DIB cocrystals were fabricated that exhibit an asymmetric optical waveguide with the optical‐loss coefficients of RBackward=0.0346 dB μm?1 and RForward=0.0894 dB μm?1 along the [010] crystal direction, which can be attributed to the unidirectional total internal reflection caused by the anisotropic molecular packing mode. Based on this crystal direction‐oriented asymmetric photon transport, these as‐prepared 2D cocrystals have been demonstrated as a microscale optical logic gate with multiple input/out channels, which will offer potential applications as the 2D optical component for the integrated organic photonics. 相似文献
11.
Dr. Mari Annadhasan Dr. Durga Prasad Karothu Ragaverthini Chinnasamy Dr. Luca Catalano Dr. Ejaz Ahmed Dr. Soumyajit Ghosh Prof. Panče Naumov Prof. Rajadurai Chandrasekar 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(33):13925-13934
Flexible organic single crystals are evolving as new materials for optical waveguides that can be used for transfer of information in organic optoelectronic microcircuits. Integration in microelectronics of such crystalline waveguides requires downsizing and precise spatial control over their shape and size at the microscale, however that currently is not possible due to difficulties with manipulation of these small, brittle objects that are prone to cracking and disintegration. Here we demonstrate that atomic force microscopy (AFM) can be used to reshape, resize and relocate single-crystal microwaveguides in order to attain spatial control over their light output. Using an AFM cantilever tip, mechanically compliant acicular microcrystals of three N-benzylideneanilines were bent to an arbitrary angle, sliced out from a bundle into individual crystals, cut into shorter crystals of arbitrary length, and moved across and above a solid surface. When excited by using laser light, such bent microcrystals act as active optical microwaveguides that transduce their fluorescence, with the total intensity of transduced light being dependent on the optical path length. This micromanipulation of the crystal waveguides using AFM is non-invasive, and after bending their emissive spectral output remains unaltered. The approach reported here effectively overcomes the difficulties that are commonly encountered with reshaping and positioning of small delicate objects (the “thick fingers” problem), and can be applied to mechanically reconfigure organic optical waveguides in order to attain spatial control over their output in two and three dimensions in optical microcircuits. 相似文献
12.
Dr. Shotaro Hayashi Prof. Toshio Koizumi 《Angewandte Chemie (International ed. in English)》2016,55(8):2701-2704
An elastic organic crystal of a π‐conjugated molecule has been fabricated. A large fluorescent single crystal of 1,4‐bis[2‐(4‐methylthienyl)]‐2,3,5,6‐tetrafluorobenzene (over 1 cm long) exhibited a fibril lamella morphology based on slip‐stacked molecular wires, and it was found to be a remarkably elastic crystalline material. The straight crystal was capable of bending more than 180° under applied stress and then quickly reverted to its original shape upon relaxation. In addition, the fluorescence quantum yield of the crystal was about twice that of the compound in THF solution. Mechanical bending–relaxation resulted in reversible change of the morphology and fluorescence. This research offers a more general approach to flexible crystals as a promising new family of organic semiconducting materials. 相似文献
13.
Lǘ Zu-Shun 《结构化学》2009,28(10):1270-1274
Ce-doped lithium niobate (LiNbO3) single crystals were grown from the melts with various Li/Nb molar ratios (0.750, 0.850, 0.946, 1.100, 1.250 and 1.380) by Czochralski method, while doping concentration of Ce was 0.1 mol%. Infrared spectra (IR) and Ultraviolet-visible absorption spectra (UV) of the crystals were measured to investigate the location of Ce ions and defect structure in crystals. The writing time, erasing time, photorefractive sensitivity and dynamic range were measured by two-wave coupling equipment. The results showed that Ce takes the place of Li lattice site, and the LiNbO3 crystal grown from the melt with Li/Nb ratio of 1.250 is stoichiometric crystal, which has the best properties due to the synergistic effect of Ce ion and Li/Nb ratio. Also the influence of various Li/Nb ratios on the defect structure and optical properties of the crystal was reported. 相似文献
14.
Mari Annadhasan Durga Prasad Karothu Ragaverthini Chinnasamy Luca Catalano Ejaz Ahmed Soumyajit Ghosh Pan
e Naumov Rajadurai Chandrasekar 《Angewandte Chemie (International ed. in English)》2020,59(33):13821-13830
Flexible organic single crystals are evolving as new materials for optical waveguides that can be used for transfer of information in organic optoelectronic microcircuits. Integration in microelectronics of such crystalline waveguides requires downsizing and precise spatial control over their shape and size at the microscale, however that currently is not possible due to difficulties with manipulation of these small, brittle objects that are prone to cracking and disintegration. Here we demonstrate that atomic force microscopy (AFM) can be used to reshape, resize and relocate single‐crystal microwaveguides in order to attain spatial control over their light output. Using an AFM cantilever tip, mechanically compliant acicular microcrystals of three N‐benzylideneanilines were bent to an arbitrary angle, sliced out from a bundle into individual crystals, cut into shorter crystals of arbitrary length, and moved across and above a solid surface. When excited by using laser light, such bent microcrystals act as active optical microwaveguides that transduce their fluorescence, with the total intensity of transduced light being dependent on the optical path length. This micromanipulation of the crystal waveguides using AFM is non‐invasive, and after bending their emissive spectral output remains unaltered. The approach reported here effectively overcomes the difficulties that are commonly encountered with reshaping and positioning of small delicate objects (the “thick fingers” problem), and can be applied to mechanically reconfigure organic optical waveguides in order to attain spatial control over their output in two and three dimensions in optical microcircuits. 相似文献
15.
16.
Noriaki Nishiguchi Takafumi Kinuta Tomohiro Sato Dr. Yoko Nakano Hayato Tokutome Dr. Nobuo Tajima Prof. Dr. Michiya Fujiki Prof. Dr. Reiko Kuroda Prof. Dr. Yoshio Matsubara Dr. Yoshitane Imai 《化学:亚洲杂志》2012,7(2):360-366
The solid‐state chiral optical properties (circular dichroism and circularly polarized luminescence) of a 2‐naphthalenecarboxylic acid/amine supramolecular organic fluorophore can be controlled by changing the aryl unit of the chiral 1‐arylethylamine component of the molecule rather than altering the chirality of the 1‐arylethylamine itself. 相似文献
17.
18.
Dr. Biswajit Bhattacharya Dr. Debjit Roy Dr. Somnath Dey Anisha Puthuvakkal Surojit Bhunia Saikat Mondal Rituparno Chowdhury Dr. Manjima Bhattacharya Mrinal Mandal Dr. Kochunnoonny Manoj Prof. Prasun K. Mandal Prof. C. Malla Reddy 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(45):20050-20055
Single crystals of optoelectronic materials that respond to external stimuli, such as mechanical, light, or heat, are immensely attractive for next generation smart materials. Here we report single crystals of a green fluorescent protein (GFP) chromophore analogue with irreversible mechanical bending and associated unusual enhancement of the fluorescence, which is attributed to the strained molecular packing in the perturbed region. Soft crystalline materials with such fluorescence intensity modulations occurring in response to mechanical stimuli under ambient pressure conditions will have potential implications for the design of technologically relevant tunable fluorescent materials. 相似文献
19.
Dr. Einat Schur Dr. Elisa Nauha Dr. Matteo Lusi Prof. Joel Bernstein 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(4):1735-1742
Non‐stoichiometric molecular mixed crystals have potential as functional materials, the properties of which can be tailored by rationally changing their composition. The guidelines for their preparation were summarized over thirty years ago by Alexander Kitaigorodsky. Here those principles are revised in light of new studies on the acridine/phenazine system, and solvent‐assisted grinding is presented as a convenient synthetic procedure to afford a more homogeneous product than traditional solvent‐evaporation methods. Finally, the proposed prerequisite of crystal isostructurality/isomorphicity for the pure compounds, which seems to be violated in the present case, is discussed. 相似文献
20.
Wenlang Li Qiuyi Huang Zhu Mao Juan Zhao Huiyan Wu Junru Chen Zhan Yang Yang Li Zhiyong Yang Yi Zhang Matthew P. Aldred Zhenguo Chi 《Angewandte Chemie (International ed. in English)》2020,59(9):3739-3745
Soft luminescent materials are attractive for optoelectronic applications, however, switching dominant chromophores for property enrichment remains a challenge. Herein, we report the first case of a soft organic molecule (DOS) featuring selective expression of chromophores. In response to various external stimuli, different chromophores of DOS can take turns working through conformation changes, exhibiting full‐colour emissions peaking from 469 nm to 583 nm from ten individual single crystals. Dynamic triplet‐exciton behaviours including thermally activated delayed fluorescence (TADF), room‐temperature phosphorescence (RTP), mechanoluminescence (ML), and distinct mechano‐responsive luminescence (MRL) can all be realized. This novel designed DOS molecule provides a multifunctional platform for detection of volatile organic compounds (VOCs), multicolour dynamic displays, sensing, anticounterfeiting, and hopefully many others. 相似文献