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Revisiting magnetic field effects in homogeneous medium and bio-mimicking environments with emphasis on acridine derivatives. J INDIAN CHEM SOC 2021. [DOI: 10.1016/j.jics.2021.100057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Duran-Giner N, Carlotti B, Clementi C, Elisei F, Encinas S, Miranda MA. Transient absorption spectroscopic studies on 4-nitroquinoline N-oxide: From femtoseconds to microseconds timescale. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 216:265-272. [PMID: 30904634 DOI: 10.1016/j.saa.2019.02.105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 02/22/2019] [Accepted: 02/25/2019] [Indexed: 06/09/2023]
Abstract
The singlet excited state of 4-nitroquinoline N-oxide (1NQNO*) has been characterized by different spectroscopic techniques, combining transient absorption with steady state and time-resolved emission spectroscopy. The energy of 1NQNO* has been established as 255 kJ/mol from the fluorescence spectrum, whereas its lifetime has been found to be 10 ps in the femto-laser flash photolysis (LFP) experiments, where a characteristic S1Sn absorption band with maximum centered at 425 nm is observed. In a first stage, the triplet excited state of NQNO (3NQNO*) has also been characterized by emission spectroscopy in solid matrix, at low temperature. Thus, from the steady-state phosphorescence spectrum the triplet energy has been estimated as 183 kJ/mol, whereas the setup with time resolution has allowed us to determine the phosphorescence lifetime as 3 ms. Formation of 3NQNO* by intersystem crossing in solution at room temperature, has been monitored by femto-LFP, which shows the appearance of a band with maximum at 560 nm (T1-Tn). It increases with the decreasing intensity of its precursor 425 nm (S1Sn) band, giving rise to an isosbestic point at 500 nm. The characterization of 3NQNO* has been completed by nano-LFP, using xanthone as photosensitizer and oxygen as well as β-carotene as quenchers. In addition, quenching of 3NQNO* by electron donors (DABCO) is also observed in aprotic solvents, leading to the radical anion of NQNO (-NQNO). If there is a proton source in the medium (Et3N as electron donor or MeCN:H2O/4:1 as solvent system) protonation of the radical anion results in formation of the neutral radical of NQNO (NQNOH). In general, all processes are slower in protic solvents because of the solvation sphere. Overall, this information provides a deeper insight into the formation and behavior of excited states and radical ionic species derived from the title molecule NQNO.
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Affiliation(s)
- Neus Duran-Giner
- Chemistry Department, Instituto de Tecnologia Quimica, Universitat Politècnica de València, Avda de los Naranjos s/n, 46022 Valencia, Spain
| | - Benedetta Carlotti
- Department of Chemistry, Biology and Biotechnology, Università degli Studi di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Catia Clementi
- Department of Chemistry, Biology and Biotechnology, Università degli Studi di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Fausto Elisei
- Department of Chemistry, Biology and Biotechnology, Università degli Studi di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Susana Encinas
- Chemistry Department, Instituto de Tecnologia Quimica, Universitat Politècnica de València, Avda de los Naranjos s/n, 46022 Valencia, Spain.
| | - Miguel A Miranda
- Chemistry Department, Instituto de Tecnologia Quimica, Universitat Politècnica de València, Avda de los Naranjos s/n, 46022 Valencia, Spain.
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Chakraborty B, Sengupta C, Pal U, Basu S. Acridone in a biological nanocavity: detailed spectroscopic and docking analyses of probing both the tryptophan residues of bovine serum albumin. NEW J CHEM 2017. [DOI: 10.1039/c7nj02454a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
AD initially gets hooked to Trp 212 housed in domain IIA, inducing conformational changes in the protein and paving the way for the ligand to reach Trp 134 located in domain IB.
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Affiliation(s)
| | | | - Uttam Pal
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
| | - Samita Basu
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
- Homi Bhaba National Institute
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Chakraborty B, Mitra P, Basu S. Spectroscopic exploration of drug–protein interaction: a study highlighting the dependence of the magnetic field effect on inter-radical separation distance formed during photoinduced electron transfer. RSC Adv 2015. [DOI: 10.1039/c5ra13575c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The magnetic field effect can be used as a “spectroscopic ruler” to assess inter-radical separation distances in photoinduced electron transfer.
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Affiliation(s)
| | - Piyali Mitra
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
| | - Samita Basu
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
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Chakraborty B, Roy AS, Dasgupta S, Basu S. Magnetic Field Effect Corroborated with Docking Study to Explore Photoinduced Electron Transfer in Drug−Protein Interaction. J Phys Chem A 2010; 114:13313-25. [DOI: 10.1021/jp109604a] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Brotati Chakraborty
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata-700064, India, and Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India
| | - Atanu Singha Roy
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata-700064, India, and Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India
| | - Swagata Dasgupta
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata-700064, India, and Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India
| | - Samita Basu
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata-700064, India, and Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India
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Banerjee M, Maiti S, Kundu I, Chakrabarti A, Basu S. Simultaneous Occurrence of Energy Transfer and Photoinduced Electron Transfer in Interactions of Hen Egg White Lysozyme with 4-Nitroquinoline-1-Oxide. Photochem Photobiol 2010; 86:1237-46. [DOI: 10.1111/j.1751-1097.2010.00811.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dey D, Pramanik NR, Basu S. Exploring the Mechanism of Electron Transfer between DNA and a Ternary Copper Complex. J Phys Chem B 2009; 113:8689-94. [DOI: 10.1021/jp810778b] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Debarati Dey
- Department of Chemistry & Environment, Heritage Institute of Technology, Chowbaga Road, Anandapur, P.O. East Kolkata Township, Kolkata 700107, India; Department of Chemistry, Chandernagar Government College, Chandernagar, India; and Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
| | - Nikhil R. Pramanik
- Department of Chemistry & Environment, Heritage Institute of Technology, Chowbaga Road, Anandapur, P.O. East Kolkata Township, Kolkata 700107, India; Department of Chemistry, Chandernagar Government College, Chandernagar, India; and Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
| | - Samita Basu
- Department of Chemistry & Environment, Heritage Institute of Technology, Chowbaga Road, Anandapur, P.O. East Kolkata Township, Kolkata 700107, India; Department of Chemistry, Chandernagar Government College, Chandernagar, India; and Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
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Das D, Nath DN. Photoreaction of Thioxanthone with Indolic and Phenolic Derivatives of Biological Relevance: Magnetic Field Effect Study. J Phys Chem A 2008; 112:11619-26. [DOI: 10.1021/jp806880s] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Doyel Das
- Department of Physical Chemistry Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Deb Narayan Nath
- Department of Physical Chemistry Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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