BODIPY

BODIPY
BODIPY (unsubstituted)
Names
Preferred IUPAC name
5,5-Difluoro-5H-4λ5-dipyrrolo[1,2-c:2′,1′-f][1,3,2]diazaborinin-4-ylium-5-uide
Other names
Dipyrrometheneboron difluoride
Identifiers
3D model (JSmol)
8139995
ChEBI
ChEMBL
ChemSpider
  • InChI=1S/C9H7BF2N2/c11-10(12)13-5-1-3-8(13)7-9-4-2-6-14(9)10/h1-7H
    Key: GUHHEAYOTAJBPT-UHFFFAOYSA-N
  • [B-]1(N2C=CC=C2C=C3[N+]1=CC=C3)(F)F
Properties
C9H7BF2N2
Molar mass 191.98 g/mol
Appearance red crystalline solid[1]
Melting point 450 °C[1]
Solubility methanol, dichloromethane[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Samples of halogenated BODIPY dyes in ambient lighting and fluorescing under UV

BODIPY is the technical common name of a chemical compound with formula C
9H
7BN
2F
2, whose molecule consists of a boron difluoride group BF
2 joined to a dipyrromethene group C
9H
7N
2; specifically, the compound 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene in the IUPAC nomenclature.[1] The common name is an abbreviation for "boron-dipyrromethene". It is a red crystalline solid, stable at ambient temperature, soluble in methanol.[1]

The compound itself was isolated only in 2009,[2][1][3] but many derivatives—formally obtained by replacing one or more hydrogen atoms by other functional groups—have been known since 1968, and comprise the important class of BODIPY dyes.[4] These organoboron compounds have attracted much interest as fluorescent dyes and markers in biological research.[1]

Structure

In its crystalline solid form, the core BODIPY is almost, but not entirely, planar and symmetrical; except for the two fluorine atoms, that lie on the perpendicular bisecting plane.[1] Its bonding can be explained by assuming a formal negative charge on the boron atom, and a formal positive charge on one of the nitrogen atoms.

Synthesis

BODIPY and its derivatives can be obtained by reacting the corresponding 2,2'-dipyrromethene derivatives with boron trifluoride-diethyl ether complex (BF
3·(C
2H
5)
2O) in the presence of triethylamine or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).[1] The difficulty of the synthesis was due to instability of the usual dipyrromethene precursor, rather than of BODIPY itself.[1][5]

The dipyrromethene precursors are accessed from a suitable pyrrole derivatives by several methods. Normally, one alpha-position in employed pyrroles is substituted and the other is free. Condensation of such pyrrole, often available from Knorr pyrrole synthesis, with an aromatic aldehyde in the presence of trifluoroacetic acid gives dipyrromethane, which is oxidized to dipyrromethene using a quinone oxidant such as DDQ[1] or p-chloranil.[6]

Alternatively, dipyrromethenes are prepared by treating a pyrrole with an activated carboxylic acid derivative, usually an acyl chloride. Unsymmetrical dipyrromethenes can be obtained by condensing pyrroles with 2-acylpyrroles. Intermediate dipyrromethanes may be isolated and purified, but isolation of dipyrromethenes is usually compromised by their instability.

Derivatives

IUPAC atom numbering for substitutions on the BODIPY core. Positions 3 and 5 are also commonly called "α"; 1,2,6,7 are called "β"; and 8 is called "meso". Note that the numbering does not match the numbering on the parent 2,2'-dipyrromethene molecule.[7]
Molecular structure of 1,3,5,7-tetramethyl-8-phenyl-substituted BODIPY.[8]

The BODIPY core has a rich derivative chemistry due to the high tolerance for substitutions in the pyrrole and aldehyde (or acyl chloride) starting materials.[5]

Hydrogen atoms at the 2 and 6 positions of the cyclic core can be displaced by halogen atoms using succinimide reagents such as NCS, NBS and NIS - which allows for further post-functionalisation through palladium coupling reactions with boronate esters, tin reagents etc.[5]

The two fluorine atoms on the boron atom can be replaced, during or after synthesis, by other strong nucleophilic reagents, such as lithiated alkyne or aryl species,[5] chlorine,[6] methoxy,[6] or a divalent "strap".[9] The reaction is catalysed by BBr3 or SnCl4.[10]

Fluorescence

BODIPY and many of its derivatives have received attention recently for being fluorescent dyes with unique properties. They strongly absorb UV-radiation and re-emit it in very narrow frequency spreads, with high quantum yields, mostly at wavelengths below 600 nm. They are relatively insensitive to the polarity and pH of their environment and are reasonably stable to physiological conditions. Small modifications to their structures enable tuning of their fluorescence characteristics.[7] BODIPY dyes are relatively chemically inert. Fluorescence is quenched in a solution, which limits application. This problem has been handled by synthesizing asymmetric boron complexes and replacing the fluorine groups with phenyl groups.

The unsubstituted BODIPY has a broad absorption band, from about 420 to 520 nm (peaking at 503 nm) and a broad emission band from about 480 to 580 nm (peaking at 512 nm), with a fluorescence lifetime of 7.2 ns. Its fluorescence quantum yield is near 1, greater than that of substituted BODIPY dyes and comparable to those of rhodamine and fluorescein, but fluorescence is lost above 50 °C.[2]

BODIPY dyes are notable for their uniquely small Stokes shift, high, environment-independent fluorescence quantum yields, often approaching 100% even in water, sharp excitation and emission peaks contributing to overall brightness, and high solubility in many organic solvents. The combination of these qualities makes BODIPY fluorophores promising for imaging applications. The position of the absorption and emission bands remain almost unchanged in solvents of different polarity as the change of permanent dipole moment upon excitation is small.

Potential applications

The advantages of BODIPY are their low photodegradation, low toxicity and polarity, high biocompatibility, charge neutrality, and high fluorescence quantum yield, all of which make BODIPY effective markers.[11][12] BODIPY conjugates are widely studied as potential sensors and for labelling biobjects (e.g. cell organelles) [13][14][15][16] by exploiting its highly tunable optoelectronic properties.[17][18] [19][20][21][22][23]

Numerous BODIPY derivatives are being investigated as electroactive species for single-substance redox flow batteries. [24] In recent years, BODIPY derivatives are also being explored as photosensitizers for applications in photodynamic therapy[25] and photocatalysis.[26]



References

  1. ^ a b c d e f g h i j k K. Tram; H. Yan; H. A. Jenkins; S. Vassiliev; D. Bruce (2009). "The synthesis and crystal structure of unsubstituted 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)". Dyes and Pigments. 82 (3): 392–395. doi:10.1016/j.dyepig.2009.03.001.
  2. ^ a b A. Schmitt; B. Hinkeldey; M. Wild; G. Jung (2009). "Synthesis of the Core Compound of the BODIPY Dye Class: 4,4′-Difluoro-4-bora-(3a,4a)-diaza-s-indacene". J. Fluoresc. 19 (4): 755–759. doi:10.1007/s10895-008-0446-7. PMID 19067126. S2CID 7012021.
  3. ^ I. J. Arroyo; R. Hu; G. Merino; B. Z. Tang; E. Peña-Cabrera (2009). "The Smallest and One of the Brightest. Efficient Preparation and Optical Description of the Parent Borondipyrromethene System". J. Org. Chem. 74 (15): 5719–22. doi:10.1021/jo901014w. PMID 19572588.
  4. ^ Alfred Treibs und Franz-Heinrich Kreuzer. Difluorboryl-Komplexe von Di- und Tripyrrylmethenen. Justus Liebigs Annalen der Chemie 1968, 718 (1): 208-223. doi: 10.1002/jlac.19687180119
  5. ^ a b c d Burgess, Kevin (October 2007). "BODIPY Dyes and Their Derivatives: Syntheses and Spectroscopic Properties". Chemical Reviews. 107 (11): 4891–4932. doi:10.1021/cr078381n. PMID 17924696.
  6. ^ a b c Groves, Brandon R.; Crawford, Sarah M.; Lundrigan, Travis; Matta, Chérif F.; Sowlati-Hashjin, Shahin; Thompson, Alison (2013). "Synthesis and characterisation of the unsubstituted dipyrrin and 4,4-dichloro-4-bora-3a,4a-diaza-s-indacene: Improved synthesis and functionalisation of the simplest BODIPY framework". Chem. Commun. 49 (8): 816–818. doi:10.1039/c2cc37480c. PMID 23235887.
  7. ^ a b Aurore Loudet and Kevin Burgess (2007): "BODIPY dyes and their derivatives:  Syntheses and spectroscopic properties". Chemical Reviews, volume 107, issue 11, pages 4891–4932. doi:10.1021/cr078381n
  8. ^ Zhong-Hua Pan; Geng-Geng Luo; Jing-Wei Zhou; Jiu-Xu Xia; Kai Fang; Rui-Bo Wu (2014). "A simple BODIPY-aniline-based fluorescent chemosensor as multiple logic operations for the detection of pH and CO2 gas". Dalton Transactions. 43 (22): 8499–507. doi:10.1039/C4DT00395K. PMID 24756338.
  9. ^ Stachelek, Patrycja; Alsimaree, Abdulrahman A.; Alnoman, Rua B.; Harriman, Anthony; Knight, Julian G. (2017-03-16). "Thermally-Activated, Delayed Fluorescence in O,B,O- and N,B,O-Strapped Boron Dipyrromethene Derivatives". The Journal of Physical Chemistry A. 121 (10): 2096–2107. Bibcode:2017JPCA..121.2096S. doi:10.1021/acs.jpca.6b11131. ISSN 1089-5639. PMID 28245114.
  10. ^ Sirbu, Dumitru; Benniston, Andrew C.; Harriman, Anthony (2017-04-07). "One-Pot Synthesis of a Mono-O,B,N-strapped BODIPY Derivative Displaying Bright Fluorescence in the Solid State". Organic Letters. 19 (7): 1626–1629. doi:10.1021/acs.orglett.7b00435. ISSN 1523-7060. PMID 28319396.
  11. ^ Lu, Hua; Mack, John; Yang, Yongchao; Shen, Zhen (2014). "Structural modification strategies for the rational design of red/NIR region BODIPYs". Chem. Soc. Rev. 43 (13): 4778–4823. doi:10.1039/C4CS00030G. ISSN 0306-0012. PMID 24733589.
  12. ^ Wang, Dongchuan; Fan, Jiangli; Gao, Xinqin; Wang, Bingshuai; Sun, Shiguo; Peng, Xiaojun (2009-10-16). "Carboxyl BODIPY Dyes from Bicarboxylic Anhydrides: One-Pot Preparation, Spectral Properties, Photostability, and Biolabeling". The Journal of Organic Chemistry. 74 (20): 7675–7683. doi:10.1021/jo901149y. ISSN 0022-3263. PMID 19772337.
  13. ^ Perronet, K.; Bouyer, P.; Westbrook, N.; Soler, N.; Fourmy, D.; Yoshizawa, S. (November 2007). "Single molecule fluorescence detection of BODIPY-FL molecules for monitoring protein synthesis". Journal of Luminescence. 127 (1): 264–268. Bibcode:2007JLum..127..264P. doi:10.1016/j.jlumin.2007.02.051.
  14. ^ Cooper, Mark S.; Szeto, Daniel P.; Sommers-Herivel, Greg; Topczewski, Jacek; Solnica-Krezel, Lila; Kang, Hee-Chol; Johnson, Iain; Kimelman, David (February 2005). "Visualizing morphogenesis in transgenic zebrafish embryos using BODIPY TR methyl ester dye as a vital counterstain for GFP". Developmental Dynamics. 232 (2): 359–368. doi:10.1002/dvdy.20252. ISSN 1058-8388. PMID 15614774.
  15. ^ Guseva, Galina B.; Antina, Elena V.; Berezin, Mikhail B.; Ksenofontov, Alexander A.; Bocharov, Pavel S.; Smirnova, Anastassia S.; Pavelyev, Roman S.; Gilfanov, Ilmir R.; Pestova, Svetlana V.; Izmest'ev, Evgeny S.; Rubtsova, Svetlana A.; Kayumov, Airat R.; Kiselev, Sergei V.; Azizova, Zulfiya R.; Ostolopovskaya, Olga V. (March 2022). "Conjugate of meso-carboxysubstituted-BODIPY with thioterpenoid as an effective fluorescent probe: Synthesis, structure, spectral characteristics, and molecular docking". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 268: 120638. Bibcode:2022AcSpA.26820638G. doi:10.1016/j.saa.2021.120638. PMID 34840052. S2CID 244408920.
  16. ^ Kaufman, Nichole E. M.; Meng, Qianli; Griffin, Kaitlin E.; Singh, Sitanshu S.; Dahal, Achyut; Zhou, Zehua; Fronczek, Frank R.; Mathis, J. Michael; Jois, Seetharama D.; Vicente, M. Graça H. (2019-04-11). "Synthesis, Characterization, and Evaluation of Near-IR Boron Dipyrromethene Bioconjugates for Labeling of Adenocarcinomas by Selectively Targeting the Epidermal Growth Factor Receptor". Journal of Medicinal Chemistry. 62 (7): 3323–3335. doi:10.1021/acs.jmedchem.8b01746. ISSN 0022-2623. PMC 6693348. PMID 30835998.
  17. ^ Sirbu, Dumitru; Luli, Saimir; Leslie, Jack; Oakley, Fiona; Benniston, Andrew C. (2019-05-17). "Enhanced in vivo Optical Imaging of the Inflammatory Response to Acute Liver Injury in C57BL/6 Mice Using a Highly Bright Near-Infrared BODIPY Dye". ChemMedChem. 14 (10): 995–999. doi:10.1002/cmdc.201900181. ISSN 1860-7179. PMID 30920173. S2CID 85544665.
  18. ^ Kowada, Toshiyuki; Maeda, Hiroki; Kikuchi, Kazuya (2015). "BODIPY-based probes for the fluorescence imaging of biomolecules in living cells". Chemical Society Reviews. 44 (14): 4953–4972. doi:10.1039/C5CS00030K. PMID 25801415.
  19. ^ Ni, Yong; Wu, Jishan (2014). "Far-red and near infrared BODIPY dyes: Synthesis and applications for fluorescent pH probes and bio-imaging". Organic & Biomolecular Chemistry. 12 (23): 3774–91. doi:10.1039/c3ob42554a. PMID 24781214.
  20. ^ Abrahamse, Heidi; Hamblin, Michael R. (2016). "New photosensitizers for photodynamic therapy". Biochemical Journal. 473 (4): 347–364. doi:10.1042/BJ20150942. PMC 4811612. PMID 26862179.
  21. ^ Lu, Hua; Mack, John; Yang, Yongchao; Shen, Zhen (2014). "Structural modification strategies for the rational design of red/NIR region BODIPYs". Chem. Soc. Rev. 43 (13): 4778–4823. doi:10.1039/C4CS00030G. PMID 24733589.
  22. ^ Roncali, Jean (2009). "Molecular Bulk Heterojunctions: An Emerging Approach to Organic Solar Cells". Accounts of Chemical Research. 42 (11): 1719–1730. doi:10.1021/ar900041b. PMID 19580313.
  23. ^ Kim, Ha Na; Ren, Wen Xiu; Kim, Jong Seung; Yoon, Juyoung (2012). "Fluorescent and colorimetric sensors for detection of lead, cadmium, and mercury ions". Chem. Soc. Rev. 41 (8): 3210–3244. doi:10.1039/C1CS15245A. PMID 22184584.
  24. ^ Kosswattaarachchi, Anjula M.; Friedman, Alan E.; Cook, Timothy R. (2016). "Characterization of a BODIPY Dye as an Active Species for Redox Flow Batteries". ChemSusChem. 9 (23): 3317–3323. Bibcode:2016ChSCh...9.3317K. doi:10.1002/cssc.201601104. PMID 27863048.
  25. ^ Turksoy, Abdurrahman; Yildiz, Deniz; Akkaya, Engin U. (2019-01-15). "Photosensitization and controlled photosensitization with BODIPY dyes". Coordination Chemistry Reviews. Novel and Smart Photosensitizers from Molecule to Nanoparticle. 379: 47–64. doi:10.1016/j.ccr.2017.09.029. hdl:11693/52868. ISSN 0010-8545. S2CID 104018445.
  26. ^ De Bonfils, Paul; Péault, Louis; Nun, Pierrick; Coeffard, Vincent (2021-03-26). "State of the Art of Bodipy-Based Photocatalysts in Organic Synthesis". European Journal of Organic Chemistry. 2021 (12): 1809–1824. doi:10.1002/ejoc.202001446. ISSN 1434-193X. S2CID 233683967.

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