Recent advances in cycloaddition of CO2 with epoxides: halogen-free catalysis and mechanistic insights

Jiaxin Li, Chengguang Yue, Wenhao Ji, Bangman Feng, Mei-Yan Wang, Xinbin Ma

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Front. Chem. Sci. Eng. ›› 2023, Vol. 17 ›› Issue (12) : 1879-1894. DOI: 10.1007/s11705-023-2354-4
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Recent advances in cycloaddition of CO2 with epoxides: halogen-free catalysis and mechanistic insights

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Abstract

The atom-economical cycloaddition of CO2 with epoxides to synthesize cyclic carbonates is a promising route for valuable utilization of CO2. Halogenide such as alkali metal halides and quaternary ammonium salt have been developed as the efficient catalysts. However, the spilled halogen causes equipment corrosion and affects the product purity. To address these concerns, the halogen-free cycloaddition of CO2 with epoxides has always been desired. In this review, we systematically discussed the halogen-free catalysis for cycloaddition of CO2 with epoxides from the mechanistic insights, aiming to promote the development of efficient halogen-free catalysts. Two types of catalysts, i.e., alternatives of halogen nucleophiles for epoxide activation, and bifunctional catalysts with Lewis acid-base sites for synergistic activation of CO2 and epoxides are summarized and emphasized. Specially, metal oxides as the potential halogen-free catalysts are highlighted due to their flexible acid-base sites for synergistic activation of CO2 and epoxides, facile preparation, and low cost.

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carbon dioxide / halogen-free catalysis / cyclic carbonate / mechanistic insight

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Jiaxin Li, Chengguang Yue, Wenhao Ji, Bangman Feng, Mei-Yan Wang, Xinbin Ma. Recent advances in cycloaddition of CO2 with epoxides: halogen-free catalysis and mechanistic insights. Front. Chem. Sci. Eng., 2023, 17(12): 1879‒1894 https://doi.org/10.1007/s11705-023-2354-4

References

[1]
Sakakura T, Choi J C, Yasuda H. Transformation of carbon dioxide. Chemical Reviews, 2007, 107(6): 2365–2387
CrossRef Google scholar
[2]
Sahoo P K, Zhang Y, Das S. CO2-promoted reactions: an emerging concept for the synthesis of fine chemicals and pharmaceuticals. ACS Catalysis, 2021, 11(6): 3414–3442
CrossRef Google scholar
[3]
Schilling W, Das S. CO2-catalyzed/promoted transformation of organic functional groups. Tetrahedron Letters, 2018, 59(43): 3821–3828
CrossRef Google scholar
[4]
Xu M T, Jupp A R, Stephan D W. Stoichiometric reactions of CO2 and indium-silylamides and catalytic synthesis of ureas. Angewandte Chemie International Edition, 2017, 56(45): 14277–14281
CrossRef Google scholar
[5]
Chen C, Zhu X R, Wen X J, Zhou Y Y, Zhou L, Li H, Tao L, Li Q L, Du S Q, Liu T T, Yan D, Xie C, Zou Y, Wang Y, Chen R, Huo J, Li Y, Cheng J, Su H, Zhao X, Cheng W, Liu Q, Lin H, Luo J, Chen J, Dong M, Cheng K, Li C, Wang S. Coupling N2 and CO2 in H2O to synthesize urea under ambient conditions. Nature Chemistry, 2020, 12(8): 717–724
CrossRef Google scholar
[6]
Hu J T, Yu L, Deng J, Wang Y, Cheng K, Ma C, Zhang Q H, Wen W, Yu S S, Pan Y, Yang J, Ma H, Qi F, Wang Y, Zheng Y, Chen M, Huang R, Zhang S, Zhao Z, Mao J, Meng X, Ji Q, Hou G, Han X, Bao X, Wang Y, Deng D. Sulfur vacancy-rich MoS2 as a catalyst for the hydrogenation of CO2 to methanol. Nature Catalysis, 2021, 4(3): 242–250
CrossRef Google scholar
[7]
Chang K, Wang T F, Chen J G G. Hydrogenation of CO2 to methanol over CuCeTiOx catalysts. Applied Catalysis B: Environmental, 2017, 206: 704–711
CrossRef Google scholar
[8]
Luo R C, Chen M, Zhou F R, Zhan J M, Deng Q, Yu Y, Zhang Y F, Xu W, Fang Y X. Synthesis of metalloporphyrin-based porous organic polymers and their functionalization for conversion of CO2 into cyclic carbonates: recent advances, opportunities and challenges. Journal of Materials Chemistry. A, Materials for Energy and Sustainability, 2021, 9(46): 25731–25749
CrossRef Google scholar
[9]
Liang J, Huang Y B, Cao R. Metal-organic frameworks and porous organic polymers for sustainable fixation of carbon dioxide into cyclic carbonates. Coordination Chemistry Reviews, 2019, 378: 32–65
CrossRef Google scholar
[10]
Lee K M, Jang J H, Balamurugan M, Kim J E, Jo Y I, Nam K T. Redox-neutral electrochemical conversion of CO2 to dimethyl carbonate. Nature Energy, 2021, 6(7): 733–741
CrossRef Google scholar
[11]
Schilling W, Das S. Transition metal-free synthesis of carbamates using CO2 as the carbon source. ChemSusChem, 2020, 13(23): 6246–6258
[12]
Cauwenbergh R, Goyal V, Maiti R, Natte K, Das S. Challenges and recent advancements in the transformation of CO2 into carboxylic acids: straightforward assembly with homogeneous 3d metals. Chemical Society Reviews, 2022, 51(22): 9371–9423
CrossRef Google scholar
[13]
Yeung C S. Photoredox catalysis as a strategy for CO2 incorporation: direct access to carboxylic acids from a renewable feedstock. Angewandte Chemie International Edition, 2019, 58(17): 5492–5502
CrossRef Google scholar
[14]
Cauwenbergh R, Das S. Photochemical reduction of carbon dioxide to formic acid. Green Chemistry, 2021, 23(7): 2553–2574
CrossRef Google scholar
[15]
Pradhan S, Das S. Recent advances on the carboxylations of C(sp3)–H bonds using CO2 as the carbon source. Synlett, 2023, 34(12): 1327–1342
CrossRef Google scholar
[16]
Lang X D, He L N. Green catalytic process for cyclic carbonate synthesis from carbon dioxide under mild conditions. Chemical Record (New York, N.Y.), 2016, 16(3): 1337–1352
CrossRef Google scholar
[17]
Schäffner B, Schaffner F, Verevkin S P, Borner A. Organic carbonates as solvents in synthesis and catalysis. Chemical Reviews, 2010, 110(8): 4554–4581
CrossRef Google scholar
[18]
Lawrenson S B, Arav R, North M. The greening of peptide synthesis. Green Chemistry, 2017, 19(7): 1685–1691
CrossRef Google scholar
[19]
Sathish M, Sreeram K J, Raghava Rao J, Unni Nair B. Cyclic carbonate: a recyclable medium for zero discharge tanning. ACS Sustainable Chemistry & Engineering, 2016, 4(3): 1032–1040
CrossRef Google scholar
[20]
Sakakura T, Kohno K. The synthesis of organic carbonates from carbon dioxide. Chemical Communications (Cambridge), 2009, 11(11): 1312–1330
CrossRef Google scholar
[21]
Wei X L, Xu W, Vijayakumar M, Cosimbescu L, Liu T B, Sprenkle V, Wang W. TEMPO-based catholyte for high-energy density nonaqueous redox flow batteries. Advanced Materials, 2014, 26(45): 7649–7653
CrossRef Google scholar
[22]
Besse V, Camara F, Voirin C, Auvergne R, Caillol S, Boutevin B. Synthesis and applications of unsaturated cyclocarbonates. Polymer Chemistry, 2013, 4(17): 4545–4561
CrossRef Google scholar
[23]
Khan A, Yang L, Xu J, Jin L Y, Zhang Y J. Palladium-catalyzed asymmetric decarboxylative cycloaddition of vinylethylene carbonates with michael acceptors: construction of vicinal quaternary stereocenters. Angewandte Chemie International Edition, 2014, 53(42): 11257–11260
CrossRef Google scholar
[24]
Guo W S, Gonzalez-Fabra J, Bandeira N A G, Bo C, Kleij A W. A metal-free synthesis of N-aryl carbamates under ambient conditions. Angewandte Chemie International Edition, 2015, 54(40): 11686–11690
CrossRef Google scholar
[25]
Liang S G, Liu H Z, Jiang T, Song J L, Yang G Y, Han B X. Highly efficient synthesis of cyclic carbonates from CO2 and epoxides over cellulose/KI. Chemical Communications (Cambridge), 2011, 47(7): 2131–2133
CrossRef Google scholar
[26]
Huang J W, Shi M. Chemical fixation of carbon dioxide by NaI/PPh3/PhOH. Journal of Organic Chemistry, 2003, 68(17): 6705–6709
CrossRef Google scholar
[27]
Barkakaty B, Morino K, Sudo A, Endo T. Amidine-mediated delivery of CO2 from gas phase to reaction system for highly efficient synthesis of cyclic carbonates from epoxides. Green Chemistry, 2010, 12(1): 42–44
CrossRef Google scholar
[28]
Hong M, Kim Y, Kim H, Cho H J, Baik M H, Kim Y. Scorpionate catalysts for coupling CO2 and epoxides to cyclic carbonates: a rational design approach for organocatalysts. Journal of Organic Chemistry, 2018, 83(16): 9370–9380
CrossRef Google scholar
[29]
Liu F S, Gu Y Q, Zhao P H, Gao J, Liu M S. Cooperative conversion of CO2 to cyclic carbonates in dual-ionic ammonium salts catalytic medium at ambient temperature. ACS Sustainable Chemistry & Engineering, 2019, 7(6): 5940–5945
CrossRef Google scholar
[30]
Ju H Y, Manju M D, Kim K H, Park S W, Park D W. Catalytic performance of quaternary ammonium salts in the reaction of butyl glycidyl ether and carbon dioxide. Journal of Industrial and Engineering Chemistry, 2008, 14(2): 157–160
CrossRef Google scholar
[31]
Jaiswal P, Varma M N. Catalytic performance of imidazolium based ILs in the reaction of 1,2-epoxyoctane and carbon dioxide: kinetic study. Journal of CO2 Utilization, 2016, 14: 93–97
[32]
Girard A L, Simon N, Zanatta M, Marmitt S, Goncalves P, Dupont J. Insights on recyclable catalytic system composed of task-specific ionic liquids for the chemical fixation of carbon dioxide. Green Chemistry, 2014, 16(5): 2815–2825
CrossRef Google scholar
[33]
Sun J, Han L J, Cheng W G, Wang J Q, Zhang X P, Zhang S J. Efficient acid-base bifunctional catalysts for the fixation of CO2 with epoxides under metal- and solvent-free conditions. ChemSusChem, 2011, 4(4): 502–507
CrossRef Google scholar
[34]
Zou B, Hu C W. Halogen-free processes for organic carbonate synthesis from CO2. Current Opinion in Green and Sustainable Chemistry, 2017, 3: 11–16
CrossRef Google scholar
[35]
Tong H Y, Qu Y Y, Li Z J, He J, Zou X, Zhou Y, Duan T, Liu B, Sun J, Guo K. Halide-free pyridinium saccharinate binary organocatalyst for the cycloaddition of CO2 into epoxides. Chemical Engineering Journal, 2022, 444: 135478
CrossRef Google scholar
[36]
Guo L P, Lamb K J, North M. Recent developments in organocatalysed transformations of epoxides and carbon dioxide into cyclic carbonates. Green Chemistry, 2021, 23(1): 77–118
CrossRef Google scholar
[37]
Shen Y M, Duan W L, Shi M. Phenol and organic bases co-catalyzed chemical fixation of carbon dioxide with terminal epoxides to form cyclic carbonates. Advanced Synthesis & Catalysis, 2003, 345(3): 337–340
CrossRef Google scholar
[38]
Shen Y M, Duan W L, Shi M. Chemical fixation of carbon dioxide catalyzed by binaphthyldiamino Zn, Cu, and Co salen-type complexes. Journal of Organic Chemistry, 2003, 68(4): 1559–1562
CrossRef Google scholar
[39]
Yue S, Qu H L, Song X X, Feng X N. Novel hydroxyl-functionalized ionic liquids as efficient catalysts for the conversion of CO2 into cyclic carbonates under metal/halogen/cocatalyst/solvent-free conditions. New Journal of Chemistry, 2022, 46(12): 5881–5888
CrossRef Google scholar
[40]
Kim Y, Ryu S, Cho W, Kim M, Park M H, Kim Y. Halide-free and bifunctional one-component catalysts for the coupling of carbon dioxide and epoxides. Inorganic Chemistry, 2019, 58(9): 5922–5931
CrossRef Google scholar
[41]
Sankar M, Ajithkumar T G, Sankar G, Manikandan P. Supported imidazole as heterogeneous catalyst for the synthesis of cyclic carbonates from epoxides and CO2. Catalysis Communications, 2015, 59: 201–205
CrossRef Google scholar
[42]
Zhou H, Zhang W Z, Liu C H, Qu J P, Lu X B. CO2 adducts of N-heterocyclic carbenes: thermal stability and catalytic activity toward the coupling of CO2 with epoxides. Journal of Organic Chemistry, 2008, 73(20): 8039–8044
CrossRef Google scholar
[43]
Kayaki Y, Yamamoto M, Ikariya T. N-Heterocyclic carbenes as efficient organocatalysts for CO2 fixation reactions. Angewandte Chemie International Edition, 2009, 48(23): 4194–4197
CrossRef Google scholar
[44]
Talapaneni S N, Buyukcakir O, Je S H, Srinivasan S, Seo Y, Polychronopoulou K, Coskun A. Nanoporous polymers incorporating sterically confined N-heterocyclic carbenes for simultaneous CO2 capture and conversion at ambient pressure. Chemistry of Materials, 2015, 27(19): 6818–6826
CrossRef Google scholar
[45]
Long G C, Wu D S, Pan H Y, Zhao T X, Hu X B. Imidazolium hydrogen carbonate ionic liquids: versatile organocatalysts for chemical conversion of CO2 into valuable chemicals. Journal of CO2 Utilization, 2020, 39: 101155
[46]
Zhou H, Wang G X, Zhang W Z, Lu X B. CO2 adducts of phosphorus ylides: highly active organocatalysts for carbon dioxide transformation. ACS Catalysis, 2015, 5(11): 6773–6779
CrossRef Google scholar
[47]
Tharun J, Roshan K R, Kathalikkattil A C, Kang D H, Ryu H M, Park D W. Natural amino acids/H2O as a metal- and halide-free catalyst system for the synthesis of propylene carbonate from propylene oxide and CO2 under moderate conditions. RSC Advances, 2014, 4(78): 41266–41270
CrossRef Google scholar
[48]
Sun J, Cheng W G, Yang Z F, Wang J Q, Xu T T, Xin J Y, Zhang S J. Superbase/cellulose: an environmentally benign catalyst for chemical fixation of carbon dioxide into cyclic carbonates. Green Chemistry, 2014, 16(6): 3071–3078
CrossRef Google scholar
[49]
Wu X, Chen C T, Guo Z Y, North M, Whitwood A C. Metal- and halide-free catalyst for the synthesis of cyclic carbonates from epoxides and carbon dioxide. ACS Catalysis, 2019, 9(3): 1895–1906
CrossRef Google scholar
[50]
Roshan K R, Kim B M, Kathalikkattil A C, Tharun J, Won Y S, Park D W. The unprecedented catalytic activity of alkanolamine CO2 scrubbers in the cycloaddition of CO2 and oxiranes: a DFT endorsed study. Chemical Communications (Cambridge), 2014, 50(89): 13664–13667
CrossRef Google scholar
[51]
Kim H G, Lim C S, Kim D W, Cho D H, Lee D K, Chung J S. Multifunctional alkanolamine as a catalyst for CO2 and propylene oxide cycloaddition. Molecular Catalysis, 2017, 438: 121–129
CrossRef Google scholar
[52]
Xu J, Gan Y L, Pei J J, Xue B. Metal-free catalytic conversion of CO2 into cyclic carbonate by hydroxyl-functionalized graphitic carbon nitride materials. Molecular Catalysis, 2020, 491: 110979
CrossRef Google scholar
[53]
Zhu J J, Diao T T, Wang W Y, Xu X L, Sun X Y, Carabineiro S A C, Zhao Z. Boron doped graphitic carbon nitride with acid-base duality for cycloaddition of carbon dioxide to epoxide under solvent-free condition. Applied Catalysis B: Environmental, 2017, 219: 92–100
CrossRef Google scholar
[54]
Chen A J, Chen C, Xiu Y H, Liu X R, Chen J Z, Guo L, Zhang R, Hou Z S. Niobate salts of organic base catalyzed chemical fixation of carbon dioxide with epoxides to form cyclic carbonates. Green Chemistry, 2015, 17(3): 1842–1852
CrossRef Google scholar
[55]
Wang Z, Li D, Chen S Q, Hu J Y, Gong Y X, Guo Y F, Deng T L. Ionic liquid [DBUH][BO2]: an excellent catalyst for chemical fixation of CO2 under mild conditions. New Journal of Chemistry, 2021, 45(10): 4611–4616
CrossRef Google scholar
[56]
Gong Y X, Li Y F, Hu J Y, Wang Z, Deng T L. Sulfur-containing amino acid-derived ionic liquid as a halogen-free catalyst for CO2 mild transformation into cyclic carbonates. New Journal of Chemistry, 2021, 45(41): 19215–19218
CrossRef Google scholar
[57]
Zhang F, Bulut S, Shen X J, Dong M H, Wang Y Y, Cheng X M, Liu H Z, Han B X. Halogen-free fixation of carbon dioxide into cyclic carbonates via bifunctional organocatalysts. Green Chemistry, 2021, 23(3): 1147–1153
CrossRef Google scholar
[58]
Férey G, Mellot-Draznieks C, Serre C, Millange F, Dutour J, Surble S, Margiolaki I. A chromium terephthalate-based solid with unusually large pore volumes and surface area. Science, 2005, 309(5743): 2040–2042
CrossRef Google scholar
[59]
Macias E E, Ratnasamy P, Carreon M A. Catalytic activity of metal organic framework Cu3(BTC)2 in the cycloaddition of CO2 to epichlorohydrin reaction. Catalysis Today, 2012, 198(1): 215–218
CrossRef Google scholar
[60]
Yang D A, Cho H Y, Kim J, Yang S T, Ahn W S. CO2 capture and conversion using Mg-MOF-74 prepared by a sonochemical method. Energy & Environmental Science, 2012, 5(4): 6465–6473
CrossRef Google scholar
[61]
Cho H Y, Yang D A, Kim J, Jeong S Y, Ahn W S. CO2 adsorption and catalytic application of Co-MOF-74 synthesized by microwave heating. Catalysis Today, 2012, 185(1): 35–40
CrossRef Google scholar
[62]
Kim J, Kim S N, Jang H G, Seo G, Ahn W S. CO2 cycloaddition of styrene oxide over MOF catalysts. Applied Catalysis A, General, 2013, 453: 175–180
CrossRef Google scholar
[63]
Han Y H, Zhou Z Y, Tian C B, Du S W. A dual-walled cage MOF as an efficient heterogeneous catalyst for the conversion of CO2 under mild and co-catalyst free conditions. Green Chemistry, 2016, 18(14): 4086–4091
CrossRef Google scholar
[64]
Miralda C M, Macias E E, Zhu M Q, Ratnasamy P, Carreon M A. Zeolitic imidazole framework-8 catalysts in the conversion of CO2 to chloropropene carbonate. ACS Catalysis, 2012, 2(1): 180–183
CrossRef Google scholar
[65]
Zhu M Q, Srinivas D, Bhogeswararao S, Ratnasamy P, Carreon M A. Catalytic activity of ZIF-8 in the synthesis of styrene carbonate from CO2 and styrene oxide. Catalysis Communications, 2013, 32: 36–40
CrossRef Google scholar
[66]
Xiang W L, Sun Z Y, Wu Y R, He L N, Liu C J. Enhanced cycloaddition of CO2 to epichlorohydrin over zeolitic imidazolate frameworks with mixed linkers under solventless and co-catalyst-free condition. Catalysis Today, 2020, 339: 337–343
CrossRef Google scholar
[67]
Yang L L, Yu L, Diao G Q, Sun M, Cheng G, Chen S Y. Zeolitic imidazolate framework-68 as an efficient heterogeneous catalyst for chemical fixation of carbon dioxide. Journal of Molecular Catalysis A Chemical, 2014, 392: 278–283
CrossRef Google scholar
[68]
Hwang G Y, Roshan R, Ryu H S, Jeong H M, Ravi S, Kim M I, Park D W. A highly efficient zeolitic imidazolate framework catalyst for the co-catalyst and solvent free synthesis of cyclic carbonates from CO2. Journal of CO2 Utilization, 2016, 15: 123–130
[69]
Mousavi B, Chaemchuen S, Moosavi B, Luo Z X, Gholampour N, Verpoort F. Zeolitic imidazole framework-67 as an efficient heterogeneous catalyst for the conversion of CO2 to cyclic carbonates. New Journal of Chemistry, 2016, 40(6): 5170–5176
CrossRef Google scholar
[70]
Kuruppathparambil R R, Babu R, Jeong H M, Hwang G Y, Jeong G S, Kim M I, Kim D W, Park D W. A solid solution zeolitic imidazolate framework as a room temperature efficient catalyst for the chemical fixation of CO2. Green Chemistry, 2016, 18(23): 6349–6356
CrossRef Google scholar
[71]
Bhanage B M, Fujita S, Ikushima Y, Arai M. Synthesis of dimethyl carbonate and glycols from carbon dioxide, epoxides, and methanol using heterogeneous basic metal oxide catalysts with high activity and selectivity. Applied Catalysis A, General, 2001, 219(1–2): 259–266
CrossRef Google scholar
[72]
Yano T, Matsui H, Koike T, Ishiguro H, Fujihara H, Yoshihara M, Maeshima T. Magnesium oxide-catalysed reaction of carbon dioxide with an epoxide with retention of stereochemistry. Chemical Communications (Cambridge), 1997, (12): 1129–1130
CrossRef Google scholar
[73]
Aresta M. Nb(V) compounds as epoxides carboxylation catalysts: the role of the solvent. Journal of Molecular Catalysis A Chemical, 2003, 204–205: 245–252
CrossRef Google scholar
[74]
Yamaguchi K, Ebitani K, Yoshida T, Yoshida H, Kaneda K. Mg-Al mixed oxides as highly active acid-base catalysts for cycloaddition of carbon dioxide to epoxides. Journal of the American Chemical Society, 1999, 121(18): 4526–4527
CrossRef Google scholar
[75]
Dai W L, Yin S F, Guo R, Luo S L, Du X, Au C T. Synthesis of propylene carbonate from carbon dioxide and propylene oxide using Zn-Mg-Al composite oxide as high-efficiency catalyst. Catalysis Letters, 2009, 136(1–2): 35–44
[76]
Adeleye A I, Patel D, Niyogi D, Saha B. Efficient and greener synthesis of propylene carbonate from carbon dioxide and propylene oxide. Industrial & Engineering Chemistry Research, 2014, 53(49): 18647–18657
CrossRef Google scholar
[77]
Gao J, Yue C G, Wang H, Li J X, Yao H, Wang M Y, Ma X B. CeO2-ZrO2 solid solution catalyzed and moderate acidic-basic sites dominated cycloaddition of CO2 with epoxides: halogen-free synthesis of cyclic carbonates. Catalysts, 2022, 12(6): 632
CrossRef Google scholar
[78]
Tambe P R, Yadav G D. Heterogeneous cycloaddition of styrene oxide with carbon dioxide for synthesis of styrene carbonate using reusable lanthanum-zirconium mixed oxide as catalyst. Clean Technologies and Environmental Policy, 2018, 20(2): 345–356
CrossRef Google scholar
[79]
Kulal N, Vasista V, Shanbhag G V. Identification and tuning of active sites in selected mixed metal oxide catalysts for cyclic carbonate synthesis from epoxides and CO2. Journal of CO2 Utilization, 2019, 33: 434–444
[80]
Rasal K B, Yadav G D, Koskinen R, Keiski R. Solventless synthesis of cyclic carbonates by direct utilization of CO2 using nanocrystalline lithium promoted magnesia. Molecular Catalysis, 2018, 451: 200–208
CrossRef Google scholar

Competing interests

The authors declare that they have no competing interests.

Acknowledgements

Financial support from the National Key R&D Program of China (Grant No. 2022YFB4101900), and National Natural Science Foundation of China (Grant Nos. 22278305 and U21B2096).

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