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Pawar SS, Ketkar RN, Gaware PB, Jagushte KU, Dhawne D, Save SN, Sharma S, Periyasamy G, Chimthanawala N, Sathaye S, Joshi SV, Sadhukhan N. Molybdenum-maltolate as a molybdopterin mimic for bioinspired oxidation reaction. Dalton Trans 2024; 53:5770-5774. [PMID: 38488043 DOI: 10.1039/d3dt04296k] [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: 03/27/2024]
Abstract
A novel cis-dioxomolybdenum(VI)-maltolate [MoO2(Mal)2] (1) is prepared as a stable molybdopterin model for the biomimetic catalysis of the oxidation of hypoxanthine in acetonitrile-water at room temperature. Compound 1 efficiently catalyzes the oxidation reaction of toluene, diphenylmethane, and styrene. Cyto- and oral-toxicity studies suggest its tremendous potential for application as a molybdenum supplement.
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Affiliation(s)
- Swapnil S Pawar
- Department of Speciality Chemicals Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India.
| | - Rohit N Ketkar
- Department of Speciality Chemicals Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India.
| | - Pranav B Gaware
- Department of Speciality Chemicals Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India.
| | - Kaustubh U Jagushte
- Department of Speciality Chemicals Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India.
| | - Divyani Dhawne
- Department of Speciality Chemicals Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India.
| | - Shreyada N Save
- Department of Biotechnology, Savitribai Phule Pune University, Ganeshkind Rd, Pune, Maharashtra - 411007, India
| | - Shilpy Sharma
- Department of Biotechnology, Savitribai Phule Pune University, Ganeshkind Rd, Pune, Maharashtra - 411007, India
| | - Ganga Periyasamy
- Department of Chemistry, Central College Campus, Bangalore University, Bangalore 560001, India
| | - Niyamat Chimthanawala
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India
| | - Sadhana Sathaye
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India
| | - Shreerang V Joshi
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India
| | - Nabanita Sadhukhan
- Department of Speciality Chemicals Technology, Institute of Chemical Technology, Mumbai, N.P. Marg, Matunga, Mumbai, Maharashtra - 400019, India.
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Jagushte KU, Sadhukhan N, Upadhyaya HP, Dutta Choudhury S. Dual Excited State Proton Transfer Pathways in the Bifunctional Photoacid 6-Amino-2-naphtol. J Phys Chem B 2023; 127:9788-9801. [PMID: 37924296 DOI: 10.1021/acs.jpcb.3c05519] [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: 11/06/2023]
Abstract
This study investigates the photoacidity and excited state proton transfer (ESPT) pathways of a bifunctional molecule, 6-amino-2-naphthol (6N2OH), using absorption, steady-state fluorescence, time-resolved fluorescence, and theoretical calculations. 6N2OH attains four different prototropic forms in the excited state (cation, neutral, anion, or zwitterion) depending on pH of the solution. Interestingly, ESPT at the OH site of the molecule can be controlled by the protonation state of the amino substituent. Conversion of the electron donating NH2 group to the electron withdrawing NH3+ group brings about a reduction of more than 7 pKa units for the deprotonation of OH in the excited state. Further, the position of the NH2 substituent on the naphthalene framework is found to play an important role in dictating the ESPT pathways of aminonaphthols. Unlike most aminonaphthol derivatives that undergo ESPT only at the OH site, akin to substituted naphthols, 6N2OH undergoes ESPT at both OH and NH3+ sites, indicating its similarity to substituted naphthols and substituted naphthylamines. ESPT at the NH3+ site resulting in cation ↔ neutral equilibrium of 6N2OH in the excited state is well-corroborated by comparative studies with another reference photoacid, 6-amino-2-methoxynaphthalene (6N2M). Correlation of the acidity constants of 6N2OH with the σp parameters according to the Hammett model reveals that while 6N2OH can be treated either as naphthol or as naphthylamine in the ground state, the structure-function correlation cannot be extrapolated directly in the excited state, thus highlighting the rich and complex photophysics of bifunctional photoacids.
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Affiliation(s)
- Kaustubh U Jagushte
- Department of Speciality Chemicals Technology, Institute of Chemical Technology, Matunga (E), Mumbai 400019, India
| | - Nabanita Sadhukhan
- Department of Speciality Chemicals Technology, Institute of Chemical Technology, Matunga (E), Mumbai 400019, India
| | - Hari P Upadhyaya
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
| | - Sharmistha Dutta Choudhury
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
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