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Akmal MH, Kalashgrani MY, Mousavi SM, Rahmanian V, Sharma N, Gholami A, Althomali RH, Rahman MM, Chiang WH. Recent advances in synergistic use of GQD-based hydrogels for bioimaging and drug delivery in cancer treatment. J Mater Chem B 2024; 12:5039-5060. [PMID: 38716622 DOI: 10.1039/d4tb00024b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Graphene quantum dot (GQD) integration into hydrogel matrices has become a viable approach for improving drug delivery and bioimaging in cancer treatment in recent years. Due to their distinct physicochemical characteristics, graphene quantum dots (GQDs) have attracted interest as adaptable nanomaterials for use in biomedicine. When incorporated into hydrogel frameworks, these nanomaterials exhibit enhanced stability, biocompatibility, and responsiveness to external stimuli. The synergistic pairing of hydrogels with GQDs has created new opportunities to tackle the problems related to drug delivery and bioimaging in cancer treatment. Bioimaging plays a pivotal role in the early detection and monitoring of cancer. GQD-based hydrogels, with their excellent photoluminescence properties, offer a superior platform for high-resolution imaging. The tunable fluorescence characteristics of GQDs enable real-time visualization of biological processes, facilitating the precise diagnosis and monitoring of cancer progression. Moreover, the drug delivery landscape has been significantly transformed by GQD-based hydrogels. Because hydrogels are porous, therapeutic compounds may be placed into them and released in a controlled environment. The large surface area and distinct interactions of graphene quantum dots (GQDs) with medicinal molecules boost loading capacity and release dynamics, ultimately improving therapeutic efficacy. Moreover, GQD-based hydrogels' stimulus-responsiveness allows for on-demand medication release, which minimizes adverse effects and improves therapeutic outcomes. The ability of GQD-based hydrogels to specifically target certain cancer cells makes them notable. Functionalizing GQDs with targeting ligands minimizes off-target effects and delivers therapeutic payloads to cancer cells selectively. Combined with imaging capabilities, this tailored drug delivery creates a theranostic platform for customized cancer treatment. In this study, the most recent advancements in the synergistic use of GQD-based hydrogels are reviewed, with particular attention to the potential revolution these materials might bring to the area of cancer theranostics.
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Affiliation(s)
- Muhammad Hussnain Akmal
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taiwan.
| | | | - Seyyed Mojtaba Mousavi
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taiwan.
| | - Vahid Rahmanian
- Department of Mechanical Engineering, Université du Québec à Trois-Rivières, Drummondville, QC, Canada
| | - Neha Sharma
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taiwan.
| | - Ahmad Gholami
- Biotechnology Research Center, Shiraz University of Medical Science, Shiraz, Iran
| | - Raed H Althomali
- Department of Chemistry, College of Art and Science, Prince Sattam bin Abdulaziz University, Wadi Al-Dawasir 11991, Al Kharj, Saudi Arabia
| | - Mohammed M Rahman
- Center of Excellence for Advanced Materials Research (CEAMR) & Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, 21589, P.O. Box 80203, Saudi Arabia.
| | - Wei-Hung Chiang
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taiwan.
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2
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Arimura S, Matsumoto I, Sekiya R, Haino T. Intermediate Color Emission via Nanographenes with Organic Fluorophores. Angew Chem Int Ed Engl 2024; 63:e202315508. [PMID: 38191241 DOI: 10.1002/anie.202315508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/19/2023] [Accepted: 01/05/2024] [Indexed: 01/10/2024]
Abstract
Photoluminescence (PL) color can be tuned by mixing fluorophores emitting the three primary colors in an appropriate ratio. When color tuning is achieved on a single substrate, we can simplify device structures. We demonstrated that nanographenes (NGs), which are graphene fragments with a size of tens of nanometers, could be utilized as carriers of fluorophores. The addition of red- and blue-light-emitting fluorophores on the edge successfully reproduced the purple light. The relative PL intensities of the fluorophores could be regulated by the excitation wavelength, enabling multicolor emission between blue and red light. Owing to the triphenylamine units of the fluorophores, the NGs showed PL enhancement due to aggregation. This characteristic was valuable for the fabrication of solid polymer materials. Specifically, the functionalized NGs can be dispersed into polyvinylidene difluoride. The resultant polymer films emitted red, blue, and purple color. Our study demonstrated the potential applicability of NGs for fluorophore carriers capable of reproducing intermediate colors of light.
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Affiliation(s)
- Saki Arimura
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ikuya Matsumoto
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
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3
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Ramírez-Barroso S, Romeo-Gella F, Fernández-García JM, Feng S, Martínez-Fernández L, García-Fresnadillo D, Corral I, Martín N, Wannemacher R. Curved Nanographenes: Multiple Emission, Thermally Activated Delayed Fluorescence, and Non-Radiative Decay. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2212064. [PMID: 37094332 DOI: 10.1002/adma.202212064] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 03/31/2023] [Indexed: 05/03/2023]
Abstract
The intriguing and rich photophysical properties of three curved nanographenes (CNG 6, 7, and 8) are investigated by time-resolved and temperature-dependent photoluminescence (PL) spectroscopy. CNG 7 and 8 exhibit dual fluorescence, as well as dual phosphorescence at low temperature in the main PL bands. In addition, hot bands are detected in fluorescence as well as phosphorescence, and, in the narrow temperature range of 100-140 K, thermally activated delayed fluorescence (TADF) with lifetimes on the millisecond time-scale is observed. These findings are rationalized by quantum-chemical simulations, which predict a single minimum of the S1 potential of CNG 6, but two S1 minima for CNG 7 and CNG 8, with considerable geometric reorganization between them, in agreement with the experimental findings. Additionally, a higher-lying S2 minimum close to S1 is optimized for the three CNG, from where emission is also possible due to thermal activation and, hence, non-Kasha behavior. The presence of higher-lying dark triplet states close to the S1 minima provides mechanistic evidence for the TADF phenomena observed. Non-radiative decay of the T1 state appears to be thermally activated with activation energies of roughly 100 meV and leads to disappearance of phosphorescence and TADF at T > 140 K.
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Affiliation(s)
- Sergio Ramírez-Barroso
- Department of Organic Chemistry, Faculty of Chemical Sciences, Complutense University of Madrid, Avenida Complutense s/n, Madrid, 28040, Spain
- Imdea Nanoscience, C/ Faraday 9, Cantoblanco, Madrid, 28049, Spain
| | | | - Jesús M Fernández-García
- Department of Organic Chemistry, Faculty of Chemical Sciences, Complutense University of Madrid, Avenida Complutense s/n, Madrid, 28040, Spain
| | - Siyang Feng
- Imdea Nanoscience, C/ Faraday 9, Cantoblanco, Madrid, 28049, Spain
| | - Lara Martínez-Fernández
- Department of Chemistry, Universidad Autónoma de Madrid, Madrid, 28049, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, 28049, Spain
| | - David García-Fresnadillo
- Department of Organic Chemistry, Faculty of Chemical Sciences, Complutense University of Madrid, Avenida Complutense s/n, Madrid, 28040, Spain
| | - Inés Corral
- Department of Chemistry, Universidad Autónoma de Madrid, Madrid, 28049, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, 28049, Spain
| | - Nazario Martín
- Department of Organic Chemistry, Faculty of Chemical Sciences, Complutense University of Madrid, Avenida Complutense s/n, Madrid, 28040, Spain
- Imdea Nanoscience, C/ Faraday 9, Cantoblanco, Madrid, 28049, Spain
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4
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Kalluri A, Dharmadhikari B, Debnath D, Patra P, Kumar CV. Advances in Structural Modifications and Properties of Graphene Quantum Dots for Biomedical Applications. ACS OMEGA 2023; 8:21358-21376. [PMID: 37360447 PMCID: PMC10286289 DOI: 10.1021/acsomega.2c08183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Accepted: 05/19/2023] [Indexed: 06/28/2023]
Abstract
Graphene quantum dots (GQDs) are carbon-based, zero-dimensional nanomaterials and unique due to their astonishing optical, electronic, chemical, and biological properties. Chemical, photochemical, and biochemical properties of GQDs are intensely being explored for bioimaging, biosensing, and drug delivery. The synthesis of GQDs by top-down and bottom-up approaches, their chemical functionalization, bandgap engineering, and biomedical applications are reviewed here. Current challenges and future perspectives of GQDs are also presented.
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Affiliation(s)
- Ankarao Kalluri
- Department
of Material Science, Department of Chemistry, and Department of Molecular and Cell
Biology, University of Connecticut, Storrs, Connecticut 06269, USA
| | - Bhushan Dharmadhikari
- Department
of Electrical and Computer Engineering and Technology, Minnesota State University, Mankato, Minnesota 56001, USA
| | - Debika Debnath
- Department of Biomedical Engineering and Department of
Mechanical Engineering, University of Bridgeport, Bridgeport, Connecticut 06604, USA
| | - Prabir Patra
- Department of Biomedical Engineering and Department of
Mechanical Engineering, University of Bridgeport, Bridgeport, Connecticut 06604, USA
| | - Challa Vijaya Kumar
- Department
of Material Science, Department of Chemistry, and Department of Molecular and Cell
Biology, University of Connecticut, Storrs, Connecticut 06269, USA
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Takahashi S, Sekiya R, Haino T. Computational Studies on the Structures of Nanographenes with Various Edge Functionalities. Chemphyschem 2023; 24:e202200465. [PMID: 36377417 DOI: 10.1002/cphc.202200465] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 11/12/2022] [Indexed: 11/16/2022]
Abstract
Computational studies have often been carried out on hydrogen-terminated nanographenes (NGs). These structures are, however, far from those deduced from experimental observations, which have suggested armchair edges with two carboxy groups on the edges as dominant. We conducted computational studies on NGs consisting of C42 , C60 , C78 , C96 , C142 , and C174 carbon atoms with hydrogen, carboxy, and N-methyl imide-terminated armchair edges. DFT calculations inform distorted basal planes and similar HOMO-LUMO gaps, indicating that the edge oxidation and functionalization do not very influence the electronic structure. Comparison of observed UV-vis spectra of carboxy- and N-octadecyl chain terminated NGs with calculated spectra of model NGs informs the contribution of π-π* transitions on the basal plane to the absorptions in the visible region. A dimeric structure of NG and octadecyl-installed NG demonstrate that both the distorted basal planes and the steric contacts among the functional groups widen the surface-to-surface distance thereby allowing the invasion of solvent molecules between the surfaces. This picture is consistent with the improved solubility of edge-modified NGs.
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Affiliation(s)
- Shusaku Takahashi
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan.,International Institute for Sustainability with Knotted Chiral Meta Matter (SKCM2), Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
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6
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Cu-THQ-EFG Composite for Highly Selective Electrochemical CO 2 Reduction to Formate at Low Overpotentials. Polymers (Basel) 2022; 14:polym14235112. [PMID: 36501512 PMCID: PMC9737261 DOI: 10.3390/polym14235112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/14/2022] [Accepted: 11/21/2022] [Indexed: 11/27/2022] Open
Abstract
Metal organic framework (MOFs) are promising materials for electrocatalysis. However, the active sites of bulk MOFs crystal normally cannot be fully utilized because of the slow reagent penetration of pores and blockage of active sites. Herein, we report a facile way to deposit copper-benzoquinoid (Cu-THQ) on the edge-functionalized graphene (EFG) which prevented material's aggregation. EFG used as a substrate provides higher electrical conductivity and stability in water than previously utilized graphene oxide (GO). Besides, the plate-like morphology of EFG proved to be more beneficial to support the MOF, because of the functional groups on its edge regions and much lower resistance compared to the sheet GO. Therefore, EFG can boost the resultant material's catalytic activity for CO2 electroreduction (CO2RR). Furthermore, Cu-THQ exhibits high selectivity for formate formation in CO2RR. Representing as the only CO2 reduced liquid product, formate can be separated from gaseous products and further extracted from the electrolyte for practical use. The electrocatalytic results of Cu-THQ-EFG indicate the composite exhibits a higher current density of -3 mA/cm2 and faradaic efficiency of -0.25 V vs. RHE, corresponding to 50 mV of overpotential. Moreover, it features a less negative on-set potential of -0.22 V vs. RHE, which is close to the equilibrium potential of CO2RR (-0.2 V vs. RHE) and is 0.16 V more positive than the on-set potential of Cu-THQ-GO (-0.38 V vs. RHE).
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7
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Takahashi S, Sekiya R, Haino T. Metal Nanoparticles on Lipophilic Nanographenes. Angew Chem Int Ed Engl 2022; 61:e202205514. [DOI: 10.1002/anie.202205514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Shusaku Takahashi
- Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima, 739-8526 Japan
| | - Ryo Sekiya
- Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima, 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima, 739-8526 Japan
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8
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Takahashi S, Sekiya R, Haino T. Metal Nanoparticles on Lipophilic Nanographenes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shusaku Takahashi
- Hiroshima Daigaku Chemistry 1-3-1 Kagamiyama 739-8526 HIgashi-Hiroshima JAPAN
| | - Ryo Sekiya
- Hiroshima Daigaku - Higashihiroshima Campus: Hiroshima Daigaku Chemistry 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima JAPAN
| | - Takeharu Haino
- Hiroshima Daigaku - Higashihiroshima Campus: Hiroshima Daigaku Department of Chemistry 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima JAPAN
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9
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Sekiya R, Haino T. Integration of Nanographenes and Organic Chemistry - Toward Nanographene-based Two-Dimensional Materials. Chemphyschem 2022; 23:e202200311. [PMID: 35650010 DOI: 10.1002/cphc.202200311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Indexed: 11/06/2022]
Abstract
Graphene and its relatives have received considerable attention from the fields of physics and chemistry since the isolation of pristine graphene sheets. Nanographenes (NGs) are graphene fragments that are a few to tens of nanometers in diameter. Compared to graphene and its relatives, such as graphene oxides, NGs can be handled more easily, and their large π surface and oxygen functional groups on the edge allow postsynthetic modifications. The study of NGs is gradually shifting from the development of synthetic procedures to postsynthetic modification. From the structural point of view, NGs can be regarded as two-dimensional carbon polymers. Their unique structures and affinity for organic molecules make NGs excellent scaffolds for two-dimensional materials, which are now an important topic in organic and polymer chemistry. In this conceptual article, we introduce the position of NGs from the perspective of two-dimensional substances and briefly summarize both the structural features of NGs and the effects of functionalization on their physical properties. These are valuable when producing reasonable strategies for their postsynthetic modifications.
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Affiliation(s)
- Ryo Sekiya
- Hiroshima Daigaku - Higashihiroshima Campus: Hiroshima Daigaku, chemistry, JAPAN
| | - Takeharu Haino
- Hiroshima Daigaku - Higashihiroshima Campus: Hiroshima Daigaku, Department of Chemistry, 1-3-1 Kagamiyama, 739-8526, Higashi-Hiroshima, JAPAN
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10
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Ricci A, Cataldi A, Zara S, Gallorini M. Graphene-Oxide-Enriched Biomaterials: A Focus on Osteo and Chondroinductive Properties and Immunomodulation. MATERIALS 2022; 15:ma15062229. [PMID: 35329679 PMCID: PMC8955105 DOI: 10.3390/ma15062229] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 02/28/2022] [Accepted: 03/14/2022] [Indexed: 11/16/2022]
Abstract
Due to its exceptional physical properties, such as high electronic conductivity, good thermal stability, excellent mechanical strength, and chemical versatility, graphene has sparked a lot of interest in the scientific community for various applications. It has therefore been employed as an antibacterial agent, in photothermal therapy (PTT) and biosensors, in gene delivery systems, and in tissue engineering for regenerative purposes. Since it was first discovered in 1947, different graphene derivatives have been synthetized from pristine graphene. The most adaptable derivate is graphene oxide (GO). Owing to different functional groups, the amphiphilic structure of GO can interact with cells and exogenous or endogenous growth/differentiation factors, allowing cell adhesion, growth, and differentiation. When GO is used as a coating for scaffolds and nanomaterials, it has been found to enhance bone, chondrogenic, cardiac, neuronal, and skin regeneration. This review focuses on the applications of graphene-based materials, in particular GO, as a coating for scaffolds in bone and chondrogenic tissue engineering and summarizes the most recent findings. Moreover, novel developments on the immunomodulatory properties of GO are reported.
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11
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Fernández-García JM, Izquierdo-García P, Buendía M, Filippone S, Martín N. Synthetic chiral molecular nanographenes: the key figure of the racemization barrier. Chem Commun (Camb) 2022; 58:2634-2645. [PMID: 35139140 DOI: 10.1039/d1cc06561k] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Chirality is one of the most intriguing concepts of chemistry, involving living systems and, more recently, materials science. In particular, the bottom-up synthesis of molecular nanographenes endowed with one or several chiral elements is a current challenge for the chemical community. The wilful introduction of defects in the sp2 honeycomb lattice of molecular nanographenes allows the preparation of chiral molecules with tuned band-gaps and chiroptical properties. There are two requirements that a system must fulfill to be chiral: (i) lack of inversion elements (planes or inversion centres) and (ii) to be configurationally stable. The first condition is inherently established by the symmetry group of the structure, however, the limit between conformational and configurational isomers is not totally clear. In this feature article, the chirality and dynamics of synthetic molecular nanographenes, with special emphasis on their racemization barriers and, therefore, the stability of their chiroptical properties are discussed. The general features of nanographenes and their bottom-up synthesis, including the main defects inducing chirality in molecular nanographenes are firstly discussed. In this regard, the most common topological defects of molecular NGs as well as the main techniques used for determining their energy barriers are presented. Then, the manuscript is structured according to the dynamics of molecular nanographenes, classifying them in four main groups, depending on their respective isomerization barriers, as flexible, detectable, isolable and rigid nanographenes. In these sections, the different strategies used to increase the isomerization barrier of chiral molecular nanographenes that lead to configurationally stable nanographenes with defined chiroptical properties are discussed.
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Affiliation(s)
- Jesús M Fernández-García
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.
| | - Patricia Izquierdo-García
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.
| | - Manuel Buendía
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.
| | - Salvatore Filippone
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.
| | - Nazario Martín
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain. .,IMDEA-Nanociencia, C/Faraday, 9, Campus de Cantoblanco, 28049 Madrid, Spain
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12
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Mützel C, Farrell JM, Shoyama K, Würthner F. 12b,24b‐Diborahexabenzo[
a
,
c
,
fg
,
l
,
n
,
qr
]pentacene: A Low‐LUMO Boron‐Doped Polycyclic Aromatic Hydrocarbon. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202115746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Carina Mützel
- Institut für Organische Chemie Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Jeffrey M. Farrell
- Institut für Organische Chemie Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Kazutaka Shoyama
- Institut für Organische Chemie Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Frank Würthner
- Institut für Organische Chemie Universität Würzburg Am Hubland 97074 Würzburg Germany
- Center for Nanosystems Chemistry (CNC) Universität Würzburg Theodor-Boveri-Weg 97074 Würzburg Germany
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13
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Sekiya R, Haino T. Nanographene - A Scaffold of Two-Dimensional Materials. CHEM REC 2021; 22:e202100257. [PMID: 34962042 DOI: 10.1002/tcr.202100257] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 12/03/2021] [Indexed: 11/07/2022]
Abstract
Substances can be divided into 0D to 3D species based on the number of repeating units (atom, ion, and molecule) and their arrangements in space (point, linear, layer, and solid). Discrete substances belong to 0D species, polymers are examples of 1D species, and molecular crystals are 3D species. Most of the substances belong to one of these species. On the other hand, those categorized into 2D species wherein the repeating units organize a layer are less explored. 2D species have a surface and edges. The incorporation of these structural features into a molecular design can realize multifunctionalized systems that are difficult to achieve by conventional organic synthesis. The development of 2D species is, therefore, the frontier of organic, inorganic, and polymer chemistry. Nanographenes (NGs) are suitable scaffolds for realizing 2D species due to several factors, such as chemical stability and oxygen-containing functional groups on the surface and on the edge, allowing postsynthetic modifications. Our group has utilized NGs with tens of nanometers in diameters for developing 2D species. Carboxy groups on the edge enable us to install various substituents into NGs, offering NG-based functional materials. These studies demonstrate that the integration of NGs with organic chemistry can widen the scope of their applications other than optical materials that are a main application of NGs. We introduce our recent studies on the development of NG-based functional materials realized by postsynthetic modifications. We hope that this account will contribute to the development of the chemistry of 2D species.
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Affiliation(s)
- Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
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14
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Mützel C, Farrell JM, Shoyama K, Würthner F. 12b,24b-Dibora-hexabenzo-[a,c,fg,l,n,qr]-pentacene: A Low-LUMO Boron-Doped Polycyclic Aromatic Hydrocarbon. Angew Chem Int Ed Engl 2021; 61:e202115746. [PMID: 34914168 PMCID: PMC9305547 DOI: 10.1002/anie.202115746] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Indexed: 11/09/2022]
Abstract
Herein we devise and execute a new synthesis of a pristine boron-doped nanographene. Our target boron-doped nanographene was designed based on DFT calculations to possess a low LUMO energy level and deep red visible range absorption derived from its precise geometry and B-doping arrangement. Our synthesis of this target, a doubly B-doped hexabenzopentacene ( B 2 -HBP ), employs six net C-H borylations of an alkene, comprising consecutive hydroboration/electrophilic borylation/dehydrogenation and BBr 3 /AlCl 3 /2,6-dichloropyridine-mediated C-H borylation steps. As predicted by our calculations, B 2 -HBP absorbs strongly in the visible region and emits in the NIR up to 1150 nm in o-dichlorobenzene solutions. Furthermore, B 2 -HBP possess a very low LUMO level, showing two reversible reductions at -1.00 V and -1.17 V vs Fc + /Fc. Our methodology is surprisingly selective despite its implementation of unfunctionalized precursors and offers a new approach to the synthesis of pristine B-doped polycyclic aromatic hydrocarbons.
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Affiliation(s)
- Carina Mützel
- Universität Würzburg: Julius-Maximilians-Universitat Wurzburg, Chemistry, GERMANY
| | - Jeffrey M Farrell
- Universität Würzburg: Julius-Maximilians-Universitat Wurzburg, Chemistry, GERMANY
| | - Kazutaka Shoyama
- Universität Würzburg: Julius-Maximilians-Universitat Wurzburg, Chemistry, GERMANY
| | - Frank Würthner
- Julius-Maximilians-Universitat Wurzburg Fakultat fur Chemie und Pharmazie, Chemistry, Am Hubland, 97074, Würzburg, GERMANY
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15
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Matsumoto I, Sekiya R, Haino T. Nanographenes from Distinct Carbon Sources. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20200381] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ikuya Matsumoto
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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16
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Nishitani S, Sekiya R, Matsumoto I, Haino T. Blueish-white-light-emitting Nanographenes Developed by Pd-catalyzed Suzuki-Miyaura Cross Coupling Reactions. CHEM LETT 2021. [DOI: 10.1246/cl.200844] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Shohei Nishitani
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Ikuya Matsumoto
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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