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Debsharma K, Dey S, Ghosh SJ, Maity S, Sinha C. Synthesis of benzimidazole derivatives via reaction between aromatic amines and aldehydes: Structure determination and theoretical insights. J INDIAN CHEM SOC 2023. [DOI: 10.1016/j.jics.2023.100878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Dey S, Paul S, Debsharma K, Sinha C. A highly emissive Zn(II)-pyridyl-benzimidazolyl-phenolato-based chemosensor: detection of H 2PO 4-via "use" and "throw" device fabrication. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:5282-5292. [PMID: 34726675 DOI: 10.1039/d1ay01575c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
2-Ethoxy-6-[1-(phenyl-pyridin-2-yl-methyl)-1H-benzoimidazol-2-yl]-phenol (HL) selectively serves as a sensitive 'turn on' Zn2+ sensor in 9 : 1 (v/v) DMSO/H2O (HEPES buffer, pH = 7.4) medium in the presence of sixteen other cations at the limit of detection (LOD) of 3.2 nM. The strong blue emission of the complex, {[Zn(L1)OAc]} (HL1 = benzimidazolyl ring-opening structure of HL) (λem, 461 nm), is quenched by H2PO4- in the presence of eighteen other anions and the LOD is 0.238 μM. The emission of the complex is due to restricted intramolecular rotation (RIR) followed by chelation-enhanced fluorescence (CHEF). The quenching of the emission of [Zn(L1)OAc] by H2PO4- (in the presence of other PVs (inorganic and biological) as well as additional anions) is due to the 'turn off' fluorescence via the demetallation and release of the nonfluorescent ligand, HL, and [Zn(H2PO4)]+. An INHIBIT logic gate memory circuit of the probe HL was devised with Zn2+ and H2PO4- as two consecutive inputs. The percentage of H2PO4- recovery was excellent and was obtained from distilled, tap, and drinking water sources. The bright blue emission of [Zn(L1)OAc] further triggered the fabrication of ready-made portable thin films of the Zn-complex, which executed a cost-effective 'on-site' solid-state contact mode detection of H2PO4- with selectivity at the picogram level (10.97 pg cm-2) by monitoring the intensities of quenched spots under UV light upon varying the analyte concentration from 10-8 to 10-3 M. Finally, taking advantage of reversible fluorescence switching, a simple and definite ion-responsive security feature was successfully embedded into a "use" and "throw" solution-coated paper strip of the Zn(II)-pyridyl-benzimidazolyl-phenolato-based chemosensor, which efficiently detected H2PO4- in water by a successive 'ON-OFF' fluorescence switching-driven security activity without any exhaustion of the emission phenomenon.
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Affiliation(s)
- Sunanda Dey
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India.
- Department of Chemistry, Mrinalini Datta Mahavidyapith, Birati, Kolkata 700051, India
| | - Sukanya Paul
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India.
| | - Kingshuk Debsharma
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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Dey S, Maity S, Purkait R, Pal K, Ghosh P, Jana K, Sinha C. X-ray structure of two Schiff bases: TURN-ON sensing of Fe 3+ and Al 3+ in the HepG2 cell line. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:5485-5495. [PMID: 33150343 DOI: 10.1039/d0ay01090a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The efficiency of the fluorescence sensitivity of a sensor may be tuned by the modulation of the steric and electronic parameters in the structure. In this study, the thiophenyl Schiff base (E)-N1-(phenyl(pyridin-2-yl)methyl)-N2-(thiophen-2-ylmethylene)benzene-1,2-diamine (HL') exhibited very high selectivity and a sensitive fluorescence enhancement towards Fe3+ with violet emission (λem, 385 nm; LOD, 3.8 nM). On the other hand, the naphthyl Schiff base (E)-1-(((2-((phenyl(pyridin-2-yl)methyl)amino)phenyl)imino)methyl)naphthalen-2-ol (H2L'') exhibited fluorescence sensitivity towards Al3+, showing blue emission (λem, 502 nm; LOD, 3.3 nM) in H2O (HEPES buffer, pH 7.4) medium. The emission enhancement of HL' upon binding to Fe3+ may be considered to be due to the restriction of intramolecular rotation, while the selectivity of H2L'' towards Al3+ may be due to the turn on emission through the restriction of excited state intramolecular proton transfer (ESIPT) and the introduction of chelation enhanced fluorescence (CHEF). Furthermore, DFT computation supported the sensing strategy and the probes were applied for intracellular detection of Fe3+ and Al3+ in HepG2 cell lines.
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Affiliation(s)
- Sunanda Dey
- Department of Chemistry, Jadavpur University, Kolkata-700032, India.
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Parvathi EVK, Pinapati SR, Tamminana R, Rudraraju RR. Iron‐Promoted Synthesis of (2‐Oxy/Thio)benzothiazole. ChemistrySelect 2020. [DOI: 10.1002/slct.202003747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | | | - Ramana Tamminana
- Department of Chemistry GITAM Deemed to be University 562163 Bengaluru India
| | - Ramesh raju Rudraraju
- Department of Chemistry Acharya Nagarjuna University, Nagarjuna Nagar Guntur AP 522510 India
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Thapa P, Palacios PM, Tran T, Pierce BS, Foss FW. 1,2-Disubstituted Benzimidazoles by the Iron Catalyzed Cross-Dehydrogenative Coupling of Isomeric o-Phenylenediamine Substrates. J Org Chem 2020; 85:1991-2009. [PMID: 31928002 DOI: 10.1021/acs.joc.9b02714] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Benzimidazoles are common in nature, medicines, and materials. Numerous strategies for preparing 2-arylbenzimidazoles exist. In this work, 1,2-disubstituted benzimidazoles were prepared from various mono- and disubstituted ortho-phenylenediamines (OPD) by iron-catalyzed oxidative coupling. Specifically, O2 and FeCl3·6H2O catalyzed the cross-dehydrogenative coupling and aromatization of diarylmethyl and dialkyl benzimidazole precursors. N,N'-Disubstituted-OPD substrates were significantly more reactive than their N,N-disubstituted isomers, which appears to be relative to their propensity for complexation and charge transfer with Fe3+. The reaction also converted N-monosubstituted OPD substrates to 2-substituted benzimidazoles; however, electron-poor substrates produce 1,2-disubstituted benzimidazoles by intermolecular imino-transfer. Kinetic, reagent, and spectroscopic (UV-vis and EPR) studies suggest a mechanism involving metal-substrate complexation, charge transfer, and aerobic turnover, involving high-valent Fe(IV) intermediates. Overall, comparative strategies for the relatively sustainable and efficient synthesis of 1,2-disubstituted benzimidazoles are demonstrated.
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Affiliation(s)
- Pawan Thapa
- Department of Chemistry and Biochemistry , The University of Texas Arlington , Arlington , Texas 76019-0065 , United States
| | - Philip M Palacios
- Department of Chemistry and Biochemistry , The University of Texas Arlington , Arlington , Texas 76019-0065 , United States
| | - Tam Tran
- Department of Chemistry and Biochemistry , The University of Texas Arlington , Arlington , Texas 76019-0065 , United States
| | - Brad S Pierce
- Department of Chemistry and Biochemistry , The University of Alabama , Tuscaloosa , Alabama 35487 , United States
| | - Frank W Foss
- Department of Chemistry and Biochemistry , The University of Texas Arlington , Arlington , Texas 76019-0065 , United States
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Dey S, Maity S, Pal K, Jana K, Sinha C. The oxidative dehydrogenation of a coumarinyl scaffold with copper ion and metal ion detection in human liver cancer cells (HepG2). Dalton Trans 2019; 48:17818-17830. [PMID: 31774094 DOI: 10.1039/c9dt03870a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
An unsymmetrical o-phenylenediamine derivative, L (7-hydroxy-4-methyl-8-(1-(phenyl- (pyridin-2-yl)methyl)-1H-benzo[d]imidazol-2-yl)-2H-chromen-2-one), has been synthesized from (E)-N1-(phenyl(pyridine-2-yl)methylene)benzene-1,2-diamine with 7-hydroxy-4-methyl-2-oxo-2H-chromene-8-carbaldehyde and characterized by X-ray, IR, 1H NMR and ESI-MS spectral analyses. The X-ray structure shows L as a cyclic benzimidazole derivative, but it undergoes ring-opening upon reaction with transition metal ions. L is non-emissive in 9 : 1 (v/v) EtOH/H2O (HEPES buffer, pH 7.4) but becomes highly fluorescent upon Zn2+ coordination, and the emissive Zn(ii) complex undergoes transmetallation in the presence of Cu2+ ions specifically, followed by amine to imine oxidation, i.e. an oxidative dehydrogenation (OD) reaction -(2e + 2H+) occurs. The transmetallation of Zn2+ from the complex by Cu2+ (CuCl2) separated the non-emissive X-ray diffractable crystal of [Cu(L'')Cl] (L'' = amine oxidized form of L). A square pyramidal [Cu(L'')][ClO4] complex was also isolated from the reaction of L with Cu(CH3CN)4(ClO4) in the presence of air, and in this complex the amine is also oxidized to the imine. Here, copper ions in the presence of air play an important role in the OD reaction of L as determined by EPR and cyclic voltammetry studies. The ligand, L, is used for Zn2+ ion recovery from a municipally supplied water sample. A paper strip detection kit for Zn2+ and Cu2+ is designed using L. The ligand is also used for intracellular Zn2+ detection in a human liver cancer cell line (HepG2).
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Affiliation(s)
- Sunanda Dey
- Department of Chemistry, Jadavpur University, Kolkata-700032, India.
| | - Suvendu Maity
- Department of Chemistry, Jadavpur University, Kolkata-700032, India.
| | - Kunal Pal
- Department of Life Science and Biotechnology, Jadavpur University, Kolkata-700032, India and Division of Molecular Medicine, Bose Institute, Kolkata-700056, India
| | - Kuladip Jana
- Division of Molecular Medicine, Bose Institute, Kolkata-700056, India
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Purkait S, Aullón G, Zangrando E, Chakraborty P. Group 12 metal complexes of (2-piperazine-1-yl-ethyl)-pyridin-2-yl-methylene-amine: rare participation of terminal piperazine N in coordination leads to structural diversity. Dalton Trans 2017; 46:2184-2195. [DOI: 10.1039/c6dt04578b] [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
Changing from 3d10–4d10–5d10 in presence of a Schiff-base ligand we obtained complexes having different nuclearities with participation of piperazine nitrogen. DFT analysis confirms coordination environment around metal centre.
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Affiliation(s)
| | - Gabriel Aullón
- Departament de Química Inorganica and Institut de Química Teorica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Ennio Zangrando
- Department of Chemical and Pharmaceutical Sciences
- University of Trieste
- 34127 Trieste
- Italy
| | - Prateeti Chakraborty
- Department of Chemistry
- School of Basic Sciences and Research
- Sharda University
- Greater Noida
- India
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Chaudhuri S, Bera S, Biswas MK, Roy AS, Weyhermüller T, Ghosh P. Oxidovanadium(iv), oxidomolybdenum(vi) and cobalt(iii) complexes of o-phenylenediamine derivatives: oxidative dehydrogenation and photoluminescence. Inorg Chem Front 2014. [DOI: 10.1039/c3qi00103b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Oxidovanadium(iv), cis-dioxidomolybdenum(vi) amide complexes and cobalt(iii) imine complex of an o-phenylenediamine derivatives are reported.
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Affiliation(s)
| | - Sachinath Bera
- Department of Chemistry
- R. K. Mission Residential College
- Kolkata-700103, India
| | - Manas Kumar Biswas
- Department of Chemistry
- R. K. Mission Residential College
- Kolkata-700103, India
| | - Amit Saha Roy
- Department of Chemistry
- R. K. Mission Residential College
- Kolkata-700103, India
| | - Thomas Weyhermüller
- Max-Planck Institute for Chemical Energy Conversion
- Mülheim an der Ruhr, Germany
| | - Prasanta Ghosh
- Department of Chemistry
- R. K. Mission Residential College
- Kolkata-700103, India
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