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Koli M, Gupta S, Chakraborty S, Ghosh A, Ghosh R, Wadawale AP, Ghanty TK, Patro BS, Mula S. Design and Synthesis of BODIPY-Hetero[5]helicenes as Heavy-Atom-Free Triplet Photosensitizers for Photodynamic Therapy of Cancer. Chemistry 2023; 29:e202301605. [PMID: 37314387 DOI: 10.1002/chem.202301605] [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: 05/20/2023] [Revised: 06/13/2023] [Accepted: 06/14/2023] [Indexed: 06/15/2023]
Abstract
Designing heavy-atom-free triplet photosensitizers (PSs) is a challenge for the efficient photodynamic therapy (PDT) of cancer. Helicenes are twisted polycyclic aromatic hydrocarbons (PAHs) with an efficient intersystem crossing (ISC) that is proportional to their twisting angle. But their difficult syntheses and weak absorption profile in the visible spectral region restrict their use as heavy-atom-free triplet PSs for PDT. On the other hand, boron-containing PAHs, BODIPYs are highly recognized for their outstanding optical properties. However, planar BODIPY dyes has low ISC and thus they are not very effective as PDT agents. We have designed and synthesized fused compounds containing both BODIPY and hetero[5]helicene structures to develop red-shifted chromophores with efficient ISC. One of the pyrrole units of the BODIPY core was also replaced by a thiazole unit to further enhance the triplet conversion. All the fused compounds have helical structure, and their twisting angles are also increased by substitutions at the boron centre. The helical structures of the BODIPY-hetero[5]helicenes were confirmed by X-ray crystallography and DFT structure optimization. The designed BODIPY-hetero[5]helicenes showed superior optical properties and high ISC with respect to [5]helicene. Interestingly their ISC efficiencies increase proportionally with their twisting angles. This is the first report on the relationship between the twisting angle and the ISC efficiency in twisted BODIPY-based compounds. Theoretical calculations showed that energy gap of the S1 and T1 states decreases in BODIPY-hetero[5]helicene as compared to planar BODIPY. This enhances the ISC rate in BODIPY-hetero[5]helicene, which is responsible for their high generation of singlet oxygen. Finally, their potential applications as PDT agents were investigated, and one BODIPY-hetero[5]helicene showed efficient cancer cell killing upon photo-exposure. This new design strategy will be very useful for the future development of heavy-atom-free PDT agents.
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Affiliation(s)
- Mrunesh Koli
- Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India
| | - Sonali Gupta
- Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India
| | - Saikat Chakraborty
- Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Ayan Ghosh
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Rajib Ghosh
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - A P Wadawale
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Tapan K Ghanty
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India
- Bio-Science Group, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Birija S Patro
- Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India
| | - Soumyaditya Mula
- Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India
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Wang D, Wang X, Zhou S, Gu P, Zhu X, Wang C, Zhang Q. Evolution of BODIPY as triplet photosensitizers from homogeneous to heterogeneous: The strategies of functionalization to various forms and their recent applications. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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Surface regulation by bifunctional BODIPY to fabricate stable CsPbBr3 for multi-layered optical anti-counterfeiting. J Colloid Interface Sci 2023; 629:63-72. [DOI: 10.1016/j.jcis.2022.08.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 08/10/2022] [Accepted: 08/19/2022] [Indexed: 11/20/2022]
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Shivran N, Koiry SP, Kushwah N, Chauhan AK, Aswal DK, Chattopadhyay S, Mula S. Effect of Alkyl Chain Length on Current‐Voltage Characteristics of BODIPY Molecules Deposited on Si(n
++
) Substrates. ChemistrySelect 2022. [DOI: 10.1002/slct.202203711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Neelam Shivran
- Bio-Organic Division Bhabha Atomic Research Centre 400085 Mumbai India
| | - Shankar P. Koiry
- Technical Physics Division Bhabha Atomic Research Centre 400085 Mumbai India
- Homi Bhabha National Institute Anushakti Nagar 400094 Mumbai India
| | - Nisha Kushwah
- Chemistry Division Bhabha Atomic Research Centre 400085 Mumbai India
| | - Anil K. Chauhan
- Technical Physics Division Bhabha Atomic Research Centre 400085 Mumbai India
- Homi Bhabha National Institute Anushakti Nagar 400094 Mumbai India
| | - Dinesh K. Aswal
- Homi Bhabha National Institute Anushakti Nagar 400094 Mumbai India
- Health, Safety and Environment Group Bhabha Atomic Research Centre 400085 Mumbai India
| | | | - Soumyaditya Mula
- Bio-Organic Division Bhabha Atomic Research Centre 400085 Mumbai India
- Homi Bhabha National Institute Anushakti Nagar 400094 Mumbai India
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Gillet A, Cher S, Tassé M, Blon T, Alves S, Izzet G, Chaudret B, Proust A, Demont P, Volatron F, Tricard S. Polarizability is a key parameter for molecular electronics. NANOSCALE HORIZONS 2021; 6:271-276. [PMID: 33507203 DOI: 10.1039/d0nh00583e] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Identifying descriptors that govern charge transport in molecular electronics is of prime importance for the elaboration of devices. The effects of molecule characteristics, such as size, bulkiness or charge, have been widely reported. Herein, we show that the molecule polarizability can be a crucial parameter to consider. To this end, platinum nanoparticle self-assemblies (PtNP SAs) are synthesized in solution, including a series of polyoxometalates (POMs). The charge of the POM unit can be modified according to the nature of the central heteroatom while keeping its size constant. POM hybrids that display remote terminal thiol functions strongly anchor the PtNP surface to form robust SAs. IV curves, recorded by conductive AFM, show a decrease in Coulomb blockade as the dielectric constant of the POMs increases. In this system, charge transport across molecular junctions can be interpreted as variations in polarizability, which is directly related to the dielectric constant.
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Affiliation(s)
- Angélique Gillet
- Laboratoire de Physique et Chimie des Nano-Objets, INSA, CNRS, Université de Toulouse, Toulouse, France.
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