Near-infrared photothermal conversion properties of carbazole-based cocrystals with different degrees of charge transfer

Shi, Peng; Liu, Xiaoxu; Dai, Xiaoling; Lu, Tong‐Bu; Chen, Jiamei

doi:10.1039/d2ce00523a

Cited by 11 publications

(20 citation statements)

References 27 publications

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Section: Resultsmentioning

confidence: 99%

“…We have obtained the value of charge transfer degree ρ of C2 from the calculated bond lengths of TCNQ. 31 Herein, the charge transfer ρ values of C1, C3 and C4 were also calculated using the same method. 32,33 The calculated values of charge transfer degree ρ of C1, C2, C3 and C4 are 0.03, 0.25, 0.07 and 0.13, respectively, which fall between those of the neutral and completely ionic species (Table S1 †).…”

Section: Crystal Structure Analysismentioning

confidence: 99%

“…In particular, the UV-vis profile of C2 is further red-shifted to 840 nm in the near-infrared region, which is consistent with the previous report. 31 This can be due to its significantly larger charge transfer degree relative to other cocrystals. Similar to the situation observed in the UV-vis absorption spectra, the reduced energy gap of the D-A cocrystals enables a pronounced bathochromic shift of the emission compared to their pristine materials.…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

“…It is noteworthy that the TCNQ cocrystals of DBF and 3,6-dichlorocarbazole 31 show totally different photophysical properties even though they have the same charge transfer degrees around 0.07. The former exhibits highly red shifted fluorescence while the latter is non-fluorescent.…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

“…7,7′,8,8′-Tetracyano-quinodimethane (TCNQ) is a representative electron acceptor due to its four -CN groups with strong electron withdrawing capacity and is often used to fabricate various charge transfer cocrystals toward tunable optoelectronic properties against the individual donors. 20,27,28 Although cocrystals of TCNQ with FR, CZ and DBT have been reported, [29][30][31] the charge transfer interactions and photophysics of them were not systematically investigated and compared.…”

Section: Introductionmentioning

confidence: 99%

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Section: Resultsmentioning

confidence: 99%

Section: Crystal Structure Analysismentioning

confidence: 99%

Section: Ft-ir Spectroscopymentioning

confidence: 99%

Section: Ft-ir Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photophysics of charge transfer cocrystals composed of fluorene and its heterocyclic analogues as donors and TCNQ as an acceptor

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Organic Photothermal Cocrystals: Rational Design, Controlled Synthesis, and Advanced Application

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Organic photothermal cocrystals, integrating the advantages of intrinsic organic cocrystals and the fascinating photothermal conversion ability, hold attracted considerable interest in both basic science and practical applications, involving photoacoustic imaging, seawater desalination, and photothermal therapy, and so on. However, these organic photothermal cocrystals currently suffer individual cases discovered step by step, as well as the deep and systemic investigation in the corresponding photothermal conversion mechanisms is rarely carried out, suggesting a huge challenge for their further developments. Therefore, it is urgently necessary to investigate and explore the rational design and synthesis of high‐performance organic photothermal cocrystals for future applications. This review first and systematically summarizes the organic photothermal cocrystal in terms of molecular classification, the photothermal conversion mechanism, and their corresponding applications. The timely interpretation of the cocrystal photothermal effect will provide broad prospects for the purposeful fabrication of excellent organic photothermal cocrystals toward great efficiency, low cost, and multifunctionality.

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Recent Advances of Organic Cocrystals in Emerging Cutting‐Edge Properties and Applications

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et al. 2024

Angewandte Chemie

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Organic cocrystals, representing one type of new functional materials, have gathered significant interest in various engineering areas. Owing to their diverse stacking modes, rich intermolecular interactions and abundant functional components, the physicochemical properties of organic cocrystals can be tailored to meet different requirements and exhibit novel characteristics. The past few years have witnessed the rapid development of organic cocrystals in both fundamental characteristics and various applications. Beyond the typical properties like ambipolarity, emission tuning ability, ferroelectricity, etc. that are previously well demonstrated, many novel impressive and cutting‐edge properties and applications of cocrystals also emerge and advance recently. Especially during the nearest five years, photothermal conversion, room‐temperature phosphorescence, thermally activated delay fluorescence, circularly polarized luminescence, organic solid‐state lasers, near‐infrared sensing, photocatalysis, batteries, and stimuli responses have been reported. In this minireview, these new properties are carefully summarized. Besides, some neoteric architecture and methodologies, such as host‐guest structures and machine learning‐based screening, are introduced. Finally, the potential future developments and expectations for organic cocrystals are discussed for further investigation on multiple functions and applications.

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Near-infrared photothermal conversion properties of carbazole-based cocrystals with different degrees of charge transfer

Abstract: Charge transfer cocrystals offer an opportunity to construct high performance organic photothermal materials. However, it is still challenging to modulate the degree of charge transfer of cocrystals to achieve rational...

Cited by 11 publications

References 27 publications

Photophysics of charge transfer cocrystals composed of fluorene and its heterocyclic analogues as donors and TCNQ as an acceptor

Photophysics of charge transfer cocrystals composed of fluorene and its heterocyclic analogues as donors and TCNQ as an acceptor

Organic Photothermal Cocrystals: Rational Design, Controlled Synthesis, and Advanced Application

Recent Advances of Organic Cocrystals in Emerging Cutting‐Edge Properties and Applications

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