Covalent Organic Framework for Efficient Two-Photon Absorption

Zhang, Liang; Zhou, Yi; Jia, Mei; He, Yaohua; Hu, Wei; Liu, Qi; Li, Jing; Xu, Xiaohui; Wang, Chao; Carlsson, Anna; Lazar, Sorin; Meingast, Arno; Ma, Yangmin; Xu, Jun; Wen, Wen; Liu, Zhihong; Cheng, Jun; Deng, Hexiang

doi:10.1016/j.matt.2020.01.019

Cited by 81 publications

(81 citation statements)

References 33 publications

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“…Impressively, it can be applied to elucidate the crystal structures of COFs even at lowresolution 3D ED data. Although the ED technique has been rapidly developed over the past decade and contributes to solving many crystal structures of nanometer-sized crystals including MOFs and COFs, 67,68 it remains challenging. 60 First of all, most of the COF structures solved by ED analysis either contain heavy atoms 63 in the form of metalated building blocks or adopt multi-fold interpenetration, 62 both of which would increase the resolution of ED measurements.…”

Section: Structure Determinations By 3d Electron Diffractionmentioning

confidence: 99%

Reticular design and crystal structure determination of covalent organic frameworks

Nguyen

2021

Chem. Sci.

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Section: Structure Determinations By 3d Electron Diffractionmentioning

confidence: 99%

Reticular design and crystal structure determination of covalent organic frameworks

Nguyen

2021

Chem. Sci.

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“…Deng group reported a synthetic protocal to construct efficient two‐photon absorption (2PA) COFs materials with molecular chromophores as building blocks. [ 107 ] Based on building units of aldehyde‐terminated triarylamine linkers and p ‐phenylenediamine, six imine COFs were synthesized. Interestingly, one of these COFs (COF‐606) shows high increase of two‐photon axtion cross‐section (2PACS), which is 110 times higher than its building molecule.…”

Section: Electron Diffraction Tomographymentioning

confidence: 99%

“…The serrated packing with a 1/8 offset between adjacent layers of COF‐606 was confirmed by STEM imaging using iDPC method (Figure 11G). [ 107 ]…”

Section: Hrtem Imagingmentioning

confidence: 99%

Unravelling Crystal Structures of Covalent Organic Frameworks by Electron Diffraction Tomography

Sun

Wei

et al. 2020

Chin. J. Chem.

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Featuring the art of covalent chemistry on 2D and 3D with molecular precision, covalent organic frameworks (COFs) have attracted immense interests from inorganic, organic, polymer, materials and energy chemistry. However, due to the synthetic challenge of “crystallization problem”, structural determination of COFs has been the bottle‐neck in speeding up their discovery and design, as well as building up their structure‐ property relation. Electron diffraction tomography (EDT) has been developed to determine crystal structures of COFs with only sub‐micrometer sized single crystals, which enabled the ab initio determination of crystal structure, molecular connectivity, pore metrics, and host‐guest interaction at the atomic level. In this review, we summarized the recent developments of EDT for addressing challenges in structure determinations of such e‐beam sensitive, organic porous crystals, covering comprehensively automatic data collection, low dose, cryogenic protocols, structural solution method, powder X‐ray diffraction refinement, and high‐resolution transmission electron microscopy (HRTEM) imaging techniques. We do believe the EDT will propel this field into the new era of COF chemistry with atomic precision, and we envision the wide application of artificial intelligence will promote the structural determination and particle analysis of COFs and related materials.

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“…[132][133][134] The macroscopic optical properties of organic porous materials are determined by the molecular dipoles, and the spatial arrangement of the molecular dipoles in the structure is critical. [135,136] As one of the most prominent NLO effects, two-photon absorption (TPA) is a process in which two or more photons are simultaneously absorbed by a material under the irradiation of a high-intensity laser beam. [137] TPA has been applied in many fields including optoelectronic communication, data storage, biomedicine, etc.…”

Section: Purely Organic Porous Materials For Third-order Nlomentioning

confidence: 99%

“…They found that the two photon action cross-section values of these COFs increased by 16 to 110 times compared to their corresponding monomers, and they proved the ordered arrangement of molecular chromophores is a key chemical approach to achieving high TPA performance of materials. [136] Two-photon fluorescent, as an important third-order NLO effect characterized by a strong penetration and high resolution, [144] is highly promising for biological imaging application. [145][146][147] Wang et al reported the COF-based hybrid probes prepared via Schiff-base condensation (Figure 4a), [56] which combined the advantages of COFs and small-molecule probes.…”

Section: Purely Organic Porous Materials For Third-order Nlomentioning

confidence: 99%

Crystalline Porous Materials for Nonlinear Optics

Shi

Han

et al. 2021

Small

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metal chalcogenides, [17,18] graphdiyne, [19][20][21] etc.) and perovskites [22][23][24][25][26] have been in a state of vigorous development and rapid advances for applications in optoelectronics, catalysis, energy conversion, due to their autologous admirable chemistry and physics characteristics. [27,28] Porous materials, a scientifically evolving and functionally compelling class of solid compounds with well-defined pore structures, such as metal-organic frameworks (MOFs), covalent organic frameworks (COFs), and polyoxometalates (POMs), have attracted broad research interest because of their wide applications in many fields including, but not limited to, adsorption, separation, catalysis, and photovoltaics. [29][30][31][32] Through fine control over the organic units to create predesigned skeletons, an exceptionally large set of materials with unique porous structures and remarkable properties have been developed. [33,34] MOFs, also known as coordination polymers or coordination networks, are one class of crystalline porous materials prepared by the self-assembly of metal ions or clusters with organic ligands. [35] They have drawn tremendous research interest for their customizable chemical structures along with unique chemical and physical properties, [36][37][38][39][40][41] which guarantee their wide applications as adsorption and separation, catalysts, magnetic, and light emitting materials. [36,[42][43][44][45] The use of appropriate ligands with optimized electronic push-pull structures, the degree of conjugation in the system and the encapsulation of guest molecules with different properties are some of the effective strategies to enhance the linear and nonlinear optical properties of the MOFs materials. [46][47][48] COFs, constructed from organic moltifs linking through strong covalent bonding, are a kind of crystalline porous materials in which the atoms of organic units are precisely integrated to create periodic frameworks and nanopores. [49,50] Although the thermal stability and crystallinity of COFs are lower than MOFs, they have received wide attention due to their low density, large surface area and strong ππ stacking. [51][52][53][54] It has been appreciated that the applications of COFs materials in third-order NLO such as two-photon fluorescence have been well developed in recent years. [55][56][57] Similar to MOFs and COFs, POMs formed by the coordination of early transition metals and oxygen atoms are a class of crystalline porous materials with unique structures and properties for their exceptional crystallinity and high stability. [58] POMs are intrinsically electron deficient, and their electronaccepting capability in combination with highly delocalized π-conjugated systems is particularly promising for producing NLO materials. [59,60] The structure of all the crystalline porous Crystalline porous materials have been extensively explored for wide applications in many fields including nonlinear optics (NLO) for frequency doubling, two-photon absorption/emission, optical limiting effect,...

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Covalent Organic Framework for Efficient Two-Photon Absorption

Cited by 81 publications

References 33 publications

Reticular design and crystal structure determination of covalent organic frameworks

Reticular design and crystal structure determination of covalent organic frameworks

Unravelling Crystal Structures of Covalent Organic Frameworks by Electron Diffraction Tomography

Crystalline Porous Materials for Nonlinear Optics

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