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Maret PD, Sasikumar D, Sebastian E, Hariharan M. Symmetry-Breaking Charge Separation in a Chiral Bis(perylenediimide) Probed at Ensemble and Single-Molecule Levels. J Phys Chem Lett 2023; 14:8667-8675. [PMID: 37733055 DOI: 10.1021/acs.jpclett.3c01889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
Chiral molecular assemblies exhibiting symmetry-breaking charge separation (SB-CS) are potential candidates for the development of chiral organic semiconductors. Herein, we explore the excited-state dynamics of a helically chiral perylenediimide bichromophore (Cy-PDI2) exhibiting SB-CS at the ensemble and single-molecule levels. Solvent polarity-tunable interchromophoric excitonic coupling in chiral Cy-PDI2 facilitates the interplay of SB-CS and excimer formation in the ensemble domain. Analogous to the excited-state dynamics of Cy-PDI2 at the ensemble level, single-molecule fluorescence lifetime traces of Cy-PDI2 depicted long-lived off-states characteristic of the radical ion pair-mediated dark states. The discrete electron transfer and charge separation dynamics in Cy-PDI2 at the single-molecule level are governed by the distinct influence of the local environment. The present study aims at understanding the fundamental excited-state dynamics in chiral organic bichromophores for designing efficient chiral organic semiconductors and applications toward charge transport materials.
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Affiliation(s)
- Philip Daniel Maret
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala P.O., Vithura, Thiruvananthapuram, Kerala 695551, India
| | - Devika Sasikumar
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala P.O., Vithura, Thiruvananthapuram, Kerala 695551, India
| | - Ebin Sebastian
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala P.O., Vithura, Thiruvananthapuram, Kerala 695551, India
| | - Mahesh Hariharan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala P.O., Vithura, Thiruvananthapuram, Kerala 695551, India
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Zhao H, Takano Y, Sasikumar D, Miyatake Y, Biju V. Excitation‐Wavelength‐Dependent Functionalities of Temporally Controlled Sensing and Generation of Singlet Oxygen by a Photoexcited State Engineered Rhodamine 6G‐Anthracene Conjugate. Chemistry 2022; 28:e202202014. [DOI: 10.1002/chem.202202014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Hanjun Zhao
- Graduate School of Environmental Science Hokkaido University N10, W5 Sapporo 060-0810 Japan
| | - Yuta Takano
- Graduate School of Environmental Science Hokkaido University N10, W5 Sapporo 060-0810 Japan
- Research Institute for Electronic Science Hokkaido University N20, W10 Sapporo 001-0020 Japan
| | - Devika Sasikumar
- Graduate School of Environmental Science Hokkaido University N10, W5 Sapporo 060-0810 Japan
- Research Institute for Electronic Science Hokkaido University N20, W10 Sapporo 001-0020 Japan
| | - Yukiko Miyatake
- Department of Pathology Faculty of Medicine and Graduate School of Medicine Hokkaido University N15, W7 Sapporo 060-8638 Japan
| | - Vasudevanpillai Biju
- Graduate School of Environmental Science Hokkaido University N10, W5 Sapporo 060-0810 Japan
- Research Institute for Electronic Science Hokkaido University N20, W10 Sapporo 001-0020 Japan
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Jadhav SD, Sasikumar D, Hariharan M. Modulating singlet fission through interchromophoric rotation. Phys Chem Chem Phys 2022; 24:16193-16199. [PMID: 35749225 DOI: 10.1039/d2cp01116f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Singlet fission (SF) is a spin-allowed, exciton-multiplying phenomenon that can be utilized to improve the efficiency of organic solar cells. It is well-understood that SF is sensitive to the local crystal morphology and an appropriately balanced coupling is essential to facilitate efficient SF. In this study, we show how the interchromophoric rotation selectively modulates the interaction between the monomer frontier molecular orbitals, promoting both fast and exothermal SF. We evaluate the effective electronic coupling for SF (VSF), the square of which is proportional to the SF rate, and the effective energies of the Frenkel exciton (FE/S1S0) and triplet pair exciton (TT) in a terrylene dimer model. Optimal interplanar rotation of the chromophoric moieties in slip-stacked arrangements pulls the effective energy of the TT state below that of the FE state. Consequently, SF is favored over competing pathways such as excimer formation, thereby enhancing the overall triplet yield. This work represents a step towards improvising the molecular design guidelines for SF and understanding the importance of interchromophoric rotation over the conventional slip-stacked arrangements for achieving favorable intermolecular electronic coupling towards efficient SF.
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Affiliation(s)
- Sohan D Jadhav
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM), Vithura, Thiruvananthapuram, Kerala, 695551, India.
| | - Devika Sasikumar
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM), Vithura, Thiruvananthapuram, Kerala, 695551, India.
| | - Mahesh Hariharan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM), Vithura, Thiruvananthapuram, Kerala, 695551, India.
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Sasikumar D, Vinod K, Sunny J, Hariharan M. Exciton interactions in helical crystals of a hydrogen-bonded eumelanin monomer. Chem Sci 2022; 13:2331-2338. [PMID: 35310511 PMCID: PMC8864807 DOI: 10.1039/d1sc06755a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 01/19/2022] [Indexed: 12/04/2022] Open
Abstract
Eumelanin, a naturally occurring group of heterogeneous polymers/aggregates providing photoprotection to living organisms, consist of 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) building blocks. Despite their prevalence in the animal world, the structure and therefore the mechanism behind the photoprotective broadband absorption and non-radiative decay of eumelanin remain largely unknown. As a small step towards solving the incessant mystery, DHI is crystallized in a non-protic solvent environment to obtain DHI crystals having a helical packing motif. The present approach reflects the solitary directional effect of hydrogen bonds between the DHI chromophores for generating the crystalline assembly and filters out any involvement of the surrounding solvent environment. The DHI single crystals having an atypical chiral packing motif (P212121 Sohncke space group) incorporate enantiomeric zig-zag helical stacks arranged in a herringbone fashion with respect to each other. Each of the zig-zag helical stacks originates from a bifurcated hydrogen bonding interaction between the hydroxyl substituents in adjacent DHI chromophores which act as the backbone structure for the helical assembly. Fragment-based excited state analysis performed on the DHI crystalline assembly demonstrates exciton delocalization along the DHI units that connect each enantiomeric helical stack while, within each stack, the excitons remain localized. Fascinatingly, over the time evolution for generation of single-crystals of the DHI-monomer, mesoscopic double-helical crystals are formed, possibly attributed to the presence of covalently connected DHI trimers in chloroform solution. The oligomeric DHI (in line with the chemical disorder model) along with the characteristic crystalline packing observed for DHI provides insights into the broadband absorption feature exhibited by the chromophore. Single crystals of DHI monomer, a eumelanin precursor, adopt an atypical chiral packing arrangement incorporating enantiomeric zig-zag helical stacks while its covalently connected DHI trimer forms double-helical crystals in the mesoscopic scale.![]()
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Affiliation(s)
- Devika Sasikumar
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Kavya Vinod
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Jeswin Sunny
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Mahesh Hariharan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
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Abstract
Over the last several decades, exploring the pathways to access the triplet excited states of organic chromophores has been a stimulating area of research. Among the numerous photoinduced processes in organic chromophores, analysis of intersystem crossing (ISC) dynamics has received immense attention. The ISC process involves a spin-forbidden horizontal transition from an excited singlet state to a higher vibrational level of the isoenergetic triplet state. Generally, ISC necessitates a strong driving force from efficient spin-orbit coupling (SOC) between the singlet and triplet wavefunctions. The magnitude of SOC can be tuned by the substituent groups (e.g. heavy atoms, carbonyl moieties) or by the out-of-plane vibrational modes in the chromophores. Besides the SOC induced ISC pathway, triplet excited states are also realised in organic chromophores through singlet fission or via charge recombination. Accessing the triplet manifold in π-conjugated systems would also include a possible evolution to more aromatically stable configurations in the excited states, an emerging area that needs attention. In the aforesaid mechanisms, the molecular architecture and/or packing arrangement of the chromophores are vital for the effective population of triplet states. We, herein, present a collection of synthetic, spectroscopic and theoretical investigations that provide insights into the diverse pathways to access triplet excited states in organic chromophores. We believe this tutorial review would prove beneficial for researchers to achieve triplet excited states of organic chromophores for numerous biochemical and optoelectronic applications.
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Affiliation(s)
- Devika Sasikumar
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala P.O., Vithura, Thiruvananthapuram, Kerala 695551, India.
| | - Athira T John
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala P.O., Vithura, Thiruvananthapuram, Kerala 695551, India.
| | - Jeswin Sunny
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala P.O., Vithura, Thiruvananthapuram, Kerala 695551, India.
| | - Mahesh Hariharan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala P.O., Vithura, Thiruvananthapuram, Kerala 695551, India.
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Mohan A, Sasikumar D, Bhat V, Hariharan M. Frontispiece: Metastable Chiral Azobenzenes Stabilized in a Double Racemate. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/anie.202080862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Amalu Mohan
- School of chemistryIndian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Devika Sasikumar
- School of chemistryIndian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Vinayak Bhat
- School of chemistryIndian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Mahesh Hariharan
- School of chemistryIndian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
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Mohan A, Sasikumar D, Bhat V, Hariharan M. Frontispiz: Metastable Chiral Azobenzenes Stabilized in a Double Racemate. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202080862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Amalu Mohan
- School of chemistry Indian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Devika Sasikumar
- School of chemistry Indian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Vinayak Bhat
- School of chemistry Indian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Mahesh Hariharan
- School of chemistry Indian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
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8
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Mohan A, Sasikumar D, Bhat V, Hariharan M. Metastable Chiral Azobenzenes Stabilized in a Double Racemate. Angew Chem Int Ed Engl 2020; 59:3201-3208. [DOI: 10.1002/anie.201910687] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Amalu Mohan
- School of chemistryIndian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Devika Sasikumar
- School of chemistryIndian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Vinayak Bhat
- School of chemistryIndian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
| | - Mahesh Hariharan
- School of chemistryIndian institute of science education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P.O., Vithura Thiruvananthapuram Kerala 695551 India
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9
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Abstract
The conversion of solar energy to thermal, chemical, or electrical energy attracts great attention in chemistry and physics. There has been a considerable effort for the efficient extraction of photons throughout the entire solar spectrum. In this work light energy was efficiently harvested by using a long-lived betaine photogenerated from an acridinium-based electron donor-acceptor dyad. The photothermal energy-conversion efficiency of the dyad is significantly enhanced by simultaneous illumination with blue (420-440 nm) and yellow (>480 nm) light in comparison with the sum of the conversion efficiencies for individual illumination with blue or yellow light. The enhanced photothermal effect is due to the photogenerated betaine, which absorbs longer-wavelength light than the dyad, and thus the dyad-betaine combination is promising for efficient photothermal energy conversion. The mechanisms of betaine generation and energy conversion are discussed on the basis of steady-state and transient spectral measurements.
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Affiliation(s)
- Devika Sasikumar
- Graduate School of Environmental Science, Hokkaido University, N10, W5, Sapporo, 060-0810, Japan
| | - Yuta Takano
- Graduate School of Environmental Science, Hokkaido University, N10, W5, Sapporo, 060-0810, Japan.,Research Institute for Electronic Science, Hokkaido University, N20, W10, Sapporo, 001-0020, Japan
| | - Vasudevanpillai Biju
- Graduate School of Environmental Science, Hokkaido University, N10, W5, Sapporo, 060-0810, Japan.,Research Institute for Electronic Science, Hokkaido University, N20, W10, Sapporo, 001-0020, Japan
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Ambili RV, Sasikumar D, Hridya P, Hariharan M. Deciphering the Multifarious Charge-Transport Behaviour of Crystalline Propeller-Shaped Triphenylamine Analogues. Chemistry 2019; 25:1992-2002. [PMID: 30431197 DOI: 10.1002/chem.201804620] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 11/02/2018] [Indexed: 02/03/2023]
Abstract
A collection of para-substituted propeller-shaped triphenylamine (TPA) derivatives have been computationally investigated for charge-transport characteristics exhibited by the derivatives by using the Marcus-Hush formalism. The various substituents chosen herein, with features that range from electron withdrawing to electron donating in nature, play a key role in defining the reorganisation energy and electronic coupling properties of the TPA derivatives. The TPA moiety is expected to possess weak electronic coupling on the basis of poor orbital overlap upon aggregation, owing to the restriction imposed by the propeller shape of the TPA core. However, the substituent groups attached to the TPA core can significantly dictate the crystal-packing motif of the TPA derivatives, wherein the variety of noncovalent intermolecular interactions subsequently generated drive the packing arrangement and influence electronic coupling between the neighbouring orbitals. Intermolecular interactions in the crystalline architecture of TPA derivatives were probed by using Hirshfeld and quantum theory of atoms-in-molecules techniques. Furthermore, symmetry-adapted perturbation theory analysis of the TPA analogues has revealed that a periodic arrangement of energetically stable dimers with significant electronic coupling is essential to contribute high charge-carrier mobility to the overall crystal.
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Affiliation(s)
- R V Ambili
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P.O. Vithura, Thiruvananthapuram, Kerala, 69551, India
| | - Devika Sasikumar
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P.O. Vithura, Thiruvananthapuram, Kerala, 69551, India
| | - P Hridya
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P.O. Vithura, Thiruvananthapuram, Kerala, 69551, India
| | - Mahesh Hariharan
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P.O. Vithura, Thiruvananthapuram, Kerala, 69551, India
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Sasikumar D, Rajendran P. Identification of Uterine Fibroids using Enhanced Image Mining Techniques: Bio-Inspired Xenogenetic Based Extreme Learning Neural Network Classification with Improved Fireflies Hausdorff Distance. Curr Med Imaging 2018. [DOI: 10.2174/1573405613666170502104715] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- D. Sasikumar
- Department of Computer Science and Engineering, Knowledege Institute of Technology, Kiot Campus, Salem-637 504, Tamil Nadu, India
| | - P. Rajendran
- Department of Computer Science and Engineering, Knowledege Institute of Technology, Kiot Campus, Salem-637 504, Tamil Nadu, India
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Bhat V, Cogdell R, Crespo-Hernández CE, Datta A, De A, Haacke S, Helliwell J, Improta R, Joseph J, Karsili T, Kohler B, Krishnan R, L M, Lewis F, Mandal I, Markovitsi D, Mishra PP, Paul S, Periyasamy G, Pradeepkumar PI, Roy Chowdhury P, Sarangi M, Sasikumar D, Schapiro I, Schertler GFX, Schlichting I, Segarra-Martí J, Swaminathan R, V V, van Grondelle R, Varghese R, Venkatramani R. Photocrosslinking between nucleic acids and proteins: general discussion. Faraday Discuss 2018; 207:283-306. [DOI: 10.1039/c8fd90005a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rajagopal SK, K. N, Deb S, Bhat V, Sasikumar D, Sebastian E, Hariharan M. Extending the scope of the carbonyl facilitated triplet excited state towards visible light excitation. Phys Chem Chem Phys 2018; 20:19120-19128. [DOI: 10.1039/c8cp01023d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A series of extended π-conjugated benzophenone analogs was synthesized through a facile Lewis-acid catalyzed Friedel–Crafts reaction in order to exploit the integral triplet state properties of benzophenone.
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Affiliation(s)
- Shinaj K. Rajagopal
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM)
- Thiruvananthapuram 695551
- India
| | - Nagaraj K.
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM)
- Thiruvananthapuram 695551
- India
| | - Somadrita Deb
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM)
- Thiruvananthapuram 695551
- India
| | - Vinayak Bhat
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM)
- Thiruvananthapuram 695551
- India
| | - Devika Sasikumar
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM)
- Thiruvananthapuram 695551
- India
| | - Ebin Sebastian
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM)
- Thiruvananthapuram 695551
- India
| | - Mahesh Hariharan
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM)
- Thiruvananthapuram 695551
- India
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