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Dangi V, Kandhal J, Gupta A, Baral M, Kanungo BK. Pyrogallol-based dipodal optical probe as new smart analytical tool for sustainable detection of cobalt in biosystem. Methods 2023; 220:79-89. [PMID: 37956725 DOI: 10.1016/j.ymeth.2023.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/07/2023] [Accepted: 11/10/2023] [Indexed: 11/15/2023] Open
Abstract
The present research focuses on the micro-level detection of cobalt ions in biological and environmental samples using a new probe. The probe is a multifunctional symmetrical dipodal molecule with two pyrogallol binding units attached to the malonate scaffold through a propylene spacer. It was synthesized and characterized by 1H NMR, 13C NMR, IR, electronic spectroscopy, and mass spectrometry. The molecule's binding, thermodynamic, and photophysical properties are also described. The designed probe demonstrates an excellent sensing ability for Co(II) based on the ESIPT "OFF-ON" fluorescence mechanism. The experiments explore the high selectivity of the ligand for cobalt sensing over a wide range of metal ions of biological and environmental importance. The fluorescence intensity shows a linear response to Co(II) in 5-100 μM concentration with a detection limit of 8.75 x 10-5 and a 2.65-fold enhancement in the intensity. These results establish its potential application as a fluorescence sensor. The probe is also employed as a colorimetric sensor for the qualitative determination of cobalt ions in DMSO solution. The interesting behavior of the probe motivated us further to study its coordination properties with divalent cobalt in solution. The pre-organized assembly with an appropriate cavity size favors the ligand for an efficient Co(II) encapsulation by coordinating through imine-Ns and aromatic ring-Os donors, giving high formation constants.
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Affiliation(s)
- Vijay Dangi
- Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana 136119, India
| | - Jyoti Kandhal
- Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana 136119, India
| | - Amit Gupta
- Department of Chemistry, Dronacharya Govt. College, Gurgaon 122001, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana 136119, India.
| | - B K Kanungo
- Department of Chemistry, Sant Longowal Insititute of Engineering & Technology, Punjab, India
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Dash D, Baral M, Kanungo BK. Development of a Flexible Tripodal Hydroxypyridinone Ligand with Cyclohexane Framework: Complexation, Solution Thermodynamics, Spectroscopic and DFT Studies. ChemistrySelect 2021. [DOI: 10.1002/slct.202102962] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dibyajit Dash
- Department of Chemistry Sant Longowal Institute of Engineering and Technology Longowal Punjab 148106 India
| | - Minati Baral
- Department of Chemistry National Institute of Technology Kurukshetra Haryana 136119 India
| | - Bikram K Kanungo
- Department of Chemistry Sant Longowal Institute of Engineering and Technology Longowal Punjab 148106 India
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Akbar R, Baral M, Kanungo BK. Spectroscopic, photophysical, solution thermodynamics and computational study of europium and terbium complexes with a flexible quinolinol-based symmetric tripodal chelator. Spectrochim Acta A Mol Biomol Spectrosc 2021; 247:119124. [PMID: 33161269 DOI: 10.1016/j.saa.2020.119124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/14/2020] [Accepted: 10/16/2020] [Indexed: 06/11/2023]
Abstract
Coordination behaviour and photonic properties of a flexible tripodal multidentate ligand, 5,5',5''-(Cyclohexane-1,3,5-triyltris(oxy))tris(methylene)triquinolin-8-ol (CYTOM5OX), with Eu and Tb ions were explored through potentiometric, UV-visible and fluorescence spectrophotometric methods. The interaction of tripod towards the lanthanides has been examined for thermodynamic equilibrium, photophysical behavior, and time-resolved luminescence measurements. Besides, a theoretically empirical method followed by quantum mechanical treatment of these chelates has also been summarized. A noticeable change in the electronic spectra of these complexes disclose CYTOM5OX as a pH-sensitive optical sensor for lanthanides detection; also, a strong green fluorescence allows simultaneous sensing in the visible region in a competitive medium. The intense fluorescence intermittently gets quenched under acidic and basic conditions due to photoinduced intramolecular electron transfer from the excited 8-hydroxyquinoline (8-HQ) moiety to the metal ion. The thermodynamically stable Ln3+ complexes in aqueous solution show stability constants in the range log β110 = 33-35 and pLn3+ in the range of 21-22. The hydration number that was predicted by the coordination scan was substantiated by lifetime measurements reveal presence of coordinated water molecules in Eu(CYTOM5OX) and Tb(CYTOM5OX) complexes. Theoretical spectra were also calculated by ZINDO/s methodology at single excitations (CIS) level on PM7 as sparkle energy-minimized geometries.
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Affiliation(s)
- Rifat Akbar
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab 148106, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology Kurukshetra, Haryana 136119, India
| | - B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab 148106, India.
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Shendge P, Sharma S, Baral M, Patel A, Parekh S, Kanungo BK. Synthesis, characterization and application of molecular hammock and pincer type complexes. PHOSPHORUS SULFUR 2021. [DOI: 10.1080/10426507.2020.1825431] [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: 10/23/2022]
Affiliation(s)
- Pratidnya Shendge
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana, India
| | - Shailza Sharma
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana, India
| | - Apurva Patel
- Deparment of Biotechnology, Veer Narmad South, Gujrat University, Surat, Gujarat, India
| | - Smita Parekh
- Deparment of Biotechnology, Veer Narmad South, Gujrat University, Surat, Gujarat, India
| | - B. K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab, India
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Dash D, Baral M, Kanungo B. Synthesis of a new tetradentate chelator with 1-Hydoroxy-2(1H)-pyridinone (HOPO) as chelating unit: Interaction with Fe (III), solution thermodynamics and DFT studies. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128796] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Dangi V, Baral M, Kanungo BK. Photophysical Studies of a Catechol Based Polyfunctional Dipodal Chelator: Application for Optical Probe for Selective Detection of Fe(III). J Fluoresc 2020; 30:1131-1149. [PMID: 32648173 DOI: 10.1007/s10895-020-02583-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 05/11/2020] [Accepted: 06/30/2020] [Indexed: 10/23/2022]
Abstract
A novel catechol based dipodal fluorescent chelator N,N'-bis[3-[(E)-(2,3-dihydroxyphenyl)methyleneamino]propyl]propanediamide(MPC), has been developed and its photophysical behaviour was studied by experimental (UV-VIS and fluorescence) and DFT method. The design of the molecule has been inspired from the naturally occurring siderophore enterobactin, a catechol based chelator with amide linkage, that shows an excellent binding efficiency towards Fe(III). The dipodal molecule (MPC) presented here, carries two catechol pendant binding moieties linked to the malonate central unit through propylene spacers by amide linkage. MPC showed good selectivity for Fe(III) at 10-4 M concentration in aqueous medium amongst the biologically and environmentally important metal ions chosen viz., Na(I), K(I), Al(III), Cr(III), Fe(III), Fe(II), Co(II), Ni(II), Cu(II), and Zn(II), by demonstrating a remarkable quenching in the fluorescent emission from 262 a.u. to 55 a.u. at λmax = 477 nm. Also, the pre-organized assembled ligand favored an efficient Fe (III) encapsulation through coordination by imine nitrogen and catecholate oxygen donors. High formation constant (log β = 31.3) for 1:1 metal-ligand complex evaluated by both potentiometric and spectrophotometric methods, established the strong binding efficiency of the ligand for Fe(III) metal ion. The binding stoichiometry in the complex was also confirmed from Stern -Volmer and Hill Plot analysis. Further investigation on the emission behavior of MPC in a completely DMSO system explored its suitability for extensive applications in the areas such as, metallurgy, material science, iron contamination remedial in the materials etc.. DFT studies suggest that the ligand displays a U-shaped geometry with a parallel π-stacking and the hydrogen bond between two arms. The experimental infrared, electronic, fluorescence, 1H nmr, 13C nmr spectra were correlated with the theoretical results. The nature of electronic transitions were identified from the TDDFT calculation. The ligand forms a hexa-coordinated complex with six Fe-O bonds extending an orthorhombic geometry due distortion from a regular octahedron.
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Affiliation(s)
- Vijay Dangi
- Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana, 136119, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana, 136119, India.
| | - B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, 148106, India
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Dangi V, Baral M, Kanungo B. Study on the Development of a Cyclohexane Based Tripodal Molecular Device as "OFF-ON-OFF" pH Sensor and Fluorescent Iron Sensor. CURR ANAL CHEM 2020. [DOI: 10.2174/1573411015666190314154126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Iron is an essential transition metal which is indispensable for life processes
like oxygen transport and metabolism, electron transfer etc. However, misregulated iron is responsible
for disease like anemia, hemochromatosis, Alzheimer’s and Parkinson’s disease. In order to encounter
these diseases, a better understanding is needed of its role in misregulation. Fluorescent iron
sensors could help provide this information. The new chemosensor developed by linking a cyclohexane
unit with three 8-hydroxyquinoline provides selective detection of iron in numerous biological
and environmental samples.
Methods:
The Uv-visible and fluorescence spectroscopy in combination with pH measurements will
mainly be used for the study. Theoretical studies at DFT level will be used to validate the method
and explain the theory behind the experiments.
Results:
The study of electronic spectra of the chelator, HQCC, reveals the appearance of a band at
262 nm along with a weak band at 335 nm due to π- π* and n- π* transitions respectively. Upon excitation
with 335 nm, the ligand fluoresces at 388 nm wavelength. The intensity of the emission was
affected in presence of metal ions, with maximum deviation for Fe(III). Selectivity studies showed
that Fe(III) is more selective as compared to the biologically relevant metal ions viz., Al(III), Fe(III),
Cr(III), Co(II), Fe(II), Ni(II), Zn(II), Cu(II), Mn(II) and Pb(II). pH dependent studies implied that the
fluorescence intensity was highest at pH ~8.0, whereas maximum quenching for iron-HQCC system
was observed at pH 7.4. The binding studies from the B-H plot confirms the formation of 1:1 complex
with association constant of 5.95 × 106. The results obtained from experiments were in agreement
with that obtained from the DFT and TD-DFT studies.
Conclusion:
A novel tripodal chelator based on 8-hydroxyquinoline and symmetric cyclohexane
scaffold was successfully developed. In addition to the excellence of the ligand to be employed as a
promising sensitive fluorescent probe for easy detection of Fe3+ions at the physiological pH with
very low concentration (7.5 x 10-5 molL-1), the new ligand can be used as an OFF-ON-OFF pH sensor.
Fe(III) encapsulation along with 1:1 ML-complexation formation have been established. Theoretical
studies confirm a d-PET mechanism for the fluorescence quenching. DFT studies revealed
that the neutral form of the ligand is less reactive than its protonated or the deprotonated form.
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Affiliation(s)
- Vijay Dangi
- Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana-136119, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana-136119, India
| | - B.K. Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal-148106, India
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Baral M, Kanungo BK. Experimental and theoretical studies on structure, bonding and luminescence properties of Eu(III) and Tb(III) complexes of a new macrocyclic based 8HQ ligand. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1605064] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Minati Baral
- Department of Chemistry, National Institute of Technology Kurukshetra, Haryana, India
| | - B. K. Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, India
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Baral M, Kanungo B, Moore P. Synthesis of cis, cis-1,3,5-trisubstituted cyclohexane based chelators with polyfunctional pendant arms. Journal of Chemical Research 2019. [DOI: 10.3184/0308234053431149] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Some novel organic compounds of the type: cis, cis-1,3,5-tris(X)cyclohexane, where X= –CONH(CH2)2NH2, –CONH(CH2)3NH2, –CONH(CH2)2NCH –C6H4OH, CONH(CH2)3NCHC6H4OH, which are expected to function as potential polydentate chelators have been synthesised from 1,3,5-benzenetricarboxylic acid through multi-steps reactions. 1,3,5-benzenetricarboxylic acid was reduced to cis, cis-1,3,5-tris(ethylcarboxylate)cyclohexane, which on reaction with excess of 1,2-diaminoethane and 1,2-diaminopropane afforded two new compounds. Condensation of the obtained derivatives with three equivalents of salicylaldehyde resulted the formation of two new Schiff base compounds. All the compounds were characterised by a combination of elemental analysis, mass, IR, UV-Vis, 1H NMR and 13C NMR spectroscopy.
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Affiliation(s)
- Minati Baral
- Department of Chemistry, Sant Harchand Singh Longowal Central Institute of Engineering & Technology Longowal, Punjab, India
| | - B.K. Kanungo
- Department of Chemistry, Sant Harchand Singh Longowal Central Institute of Engineering & Technology Longowal, Punjab, India
| | - Peter Moore
- Department of Chemistry, Sant Harchand Singh Longowal Central Institute of Engineering & Technology Longowal, Punjab, India
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Akbar R, Baral M, Kanungo BK. Synthesis, thermodynamic, photophysical and DFT studies of some trivalent metal chelates of a hexadentate tripodal hydroxyquinolinate-based ligand. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1430362] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Rifat Akbar
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology Kurukshetra, Haryana, India
| | - B. K. Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, India
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Rohini R, Baral M, Kanungo BK. Comparative studies of the electronic, binding and photophysical properties of a new nona-dentate hemi-cage tripodal HQ pendant trizaza-macrocycle with unfilled, half-filled and completely filled lanthanide ions. NEW J CHEM 2018. [DOI: 10.1039/c8nj02217h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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
The present paper describes the comparative studies of the electronic, photophysical and binding properties of a new C3-symmetric polydentate ligand and its complexes with 4f0, 4f7, and 4f14 metal ions (La3+, Gd3+, and Lu3+).
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Affiliation(s)
- Rohini Rohini
- Department of Chemistry
- Sant Longowal Institute of Engineering & Technology
- Longowal
- India
| | - Minati Baral
- Department of Chemistry
- National Institute of Technology Kurukshetra
- India
| | - B. K. Kanungo
- Department of Chemistry
- Sant Longowal Institute of Engineering & Technology
- Longowal
- India
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Akbar R, Baral M, Kanungo BK. Photoluminescence and Coordination Behaviour of Lanthanide Complexes of Tris (Aminomethyl)Ethane-5-Oxine in Aqueous Solution. J Fluoresc 2016; 27:89-103. [PMID: 27704235 DOI: 10.1007/s10895-016-1937-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 07/17/2016] [Accepted: 09/12/2016] [Indexed: 10/20/2022]
Abstract
Photophysical properties of a multidentate tripodal ligand, 5,5'-(2-(((8-hydroxyquinolin-5-yl) methylamino)methyl)-2-methylpropane-1,3-diyl) bis (azanediyl)bis (methylene)diquinolin-8-ol, (TAME5OX), with La3+ and Er3+ ions have been examined for photonics applications. The change in behavior in electronic spectra of these complexes reveals the use of TAME5OX as a sensitive optical pH based sensor to detect Ln3+ ions whereas indication of strong green fluorescence allows simultaneous sensing within the visible region in competitive medium. The intense fluorescence intermittently gets quenched under acidic and basic conditions due to photoinduced intramolecular electron transfer from the excited 8-hydroxyquinoline (8-HQ) moiety to the metal ion. This renders these compounds the OFF-ON-OFF type of pH-dependent fluorescent sensor. The thermodynamic stability and coordination behaviour of the chelator with the said lanthanide ions have also been probed by potentiometric, UV - visible and fluorescence spectrophotometric method. TAME5OX forms protonated complex [Ln (H4L)]4+ below pH ~4.0 which sequentially deprotonates through one proton process with increase of pH. The stability constants of neutral complexes have been determined to be in the range log β110 = 32-34 and pLn in the range of 14-20, indicating TAME5OX is a good synthetic lanthanide chelator. Theoretical spectra were also calculated by ZINDO/s methodology at single excitations (CIS) level on PM7 as sparkle energy-minimized geometries.
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Affiliation(s)
- Rifat Akbar
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab, 148106, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology Kurukshetra, Haryana, 136119, India
| | - B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab, 148106, India.
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Baral M, Gupta A, Kanungo BK. Development of a C₃-symmetric benzohydroxamate tripod: Trimetallic complexation with Fe(III), Cr(III) and Al(III). Spectrochim Acta A Mol Biomol Spectrosc 2016; 162:6-15. [PMID: 26970809 DOI: 10.1016/j.saa.2016.02.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Revised: 01/26/2016] [Accepted: 02/28/2016] [Indexed: 06/05/2023]
Abstract
The design, synthesis and physicochemical characterization of a C3-symmetry Benzene-1,3,5-tricarbonylhydroxamate tripod, noted here as BTHA, are described. The chelator was built from a benzene as an anchor, symmetrically extended by three hydroxamate as ligating moieties, each bearing O, O donor sites. A combination of absorption spectrophotometry, potentiometry and theoretical investigations are used to explore the complexation behavior of the ligand with some trivalent metal ions: Fe(III), Cr(III), and Al(III). Three protonation constants were calculated for the ligand in a pH range of 2-11 in a highly aqueous medium (9:1 H2O: DMSO). A high rigidity in the molecular structure restricts the formation of 1:1 (M/L) metal encapsulation but shows a high binding efficiency for a 3:1 metal ligand stoichiometry giving formation constant (in β unit) 28.73, 26.13 and 19.69 for [M3L]; M=Fe(III), Al(III) and Cr(III) respectively, and may be considered as an efficient Fe-carrier. The spectrophotometric study reveals of interesting electronic transitions occurred during the complexation. BTHA exhibits a peak at 238 nm in acidic pH and with the increase of pH, a new peak appeared at 270 nm. A substantial shifting in both of the peaks in presence of the metal ions implicates a s coordination between ligand and metal ions. Moreover, complexation of BTHA with iron shows three distinct colors, violet, reddish orange and yellow in different pH, enables the ligand to be considered for the use as colorimetric sensor.
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Affiliation(s)
- Minati Baral
- Department of Chemistry, National Institute of Engineering and Technology Kurukshetra, Haryana 136119, India.
| | - Amit Gupta
- Department of Chemistry, National Institute of Engineering and Technology Kurukshetra, Haryana 136119, India
| | - B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering and Technology, Longowal, Punjab 148106, India
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Rohini R, Baral M, Kanungo BK. Excimer formation and dual fluorescence emission of a hydroxyquinoline based macrocyclic tripod: existence of intra and intermolecular π-stacking. RSC Adv 2016. [DOI: 10.1039/c6ra22809g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The excited state reaction of 1,4,7-tris-(5-methylene-8-hydroxyquinoline)-1,4,7-triazacyclononane was studied in solution. The intramolecular-π-stacked tripod shows pH-dependent eximer emission and dual fluorescence due to intermolecular π-stacking.
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Affiliation(s)
- Rohini Rohini
- Department of Chemistry
- Sant Longowal Institute of Engineering & Technology
- Longowal
- India
| | - Minati Baral
- Department of Chemistry
- National Institute of Technology Kurukshetra
- India
| | - B. K. Kanungo
- Department of Chemistry
- Sant Longowal Institute of Engineering & Technology
- Longowal
- India
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Kaur K, Baral M. Ability of two novel α-amino acid-based tridentate ligands to complex Fe3+ in solution. Res Chem Intermed 2015. [DOI: 10.1007/s11164-014-1689-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kanta Bera R, K. Sahoo S, Baral M, Kanungo BK. New Potentiometric Iron(III)-selective Electrode Based on a Tris(Aminophenolate) as a Sensing Molecule. CURR ANAL CHEM 2015. [DOI: 10.2174/1573411011666150403225603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Akbar R, Baral M, Kanungo BK. TAME5OX, abiotic siderophore analogue to enterobactin involving 8-hydroxyquinoline subunits: thermodynamic and photophysical studies. Spectrochim Acta A Mol Biomol Spectrosc 2015; 142:246-259. [PMID: 25703371 DOI: 10.1016/j.saa.2015.01.104] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 01/12/2015] [Accepted: 01/30/2015] [Indexed: 06/04/2023]
Abstract
The synthesis, thermodynamic and photophysical properties of trivalent metal complexes of biomimetic nonadentate analogue, 5,5'-(2-(((8-hydroxyquinolin-5-yl)methylamino)methyl)-2-methylpropane-1,3-diyl)bis(azanediyl)bis(methylene)diquinolin-8-ol (TAME5OX), have been described. Combination of absorption and emission spectrophotometry, potentiometry, electrospray mass spectrometry, IR, and theoretical investigation were used to fully characterize metal (Fe(+3), Al(+3) and Cr(+3)) chelates of TAME5OX. In solution, TAME5OX forms protonated complexes [M(H3L)](3+) below pH 3.4, which consecutively deprotonates through one to three-proton processes with rise of pH. The formation constants (Logβ11n) of neutral complexes formed at or above physiological pH, have been determined to be 30.18, 23.27 and 22.02 with pM values of 31.16, 18.07 and 18.12 for Fe(+3), Al(+3) and Cr(+3) ions, respectively, calculated at pH 7.4, indicating TAME5OX is a powerful among synthetic metal chelator. The results clearly demonstrate that the ligand in a tripodal orchestration firmly binds these ions over wide pH range and forms distorted octahedral complexes. The binding and the coordination event could be monitored from absorption and fluorescence spectroscopy. The high thermodynamic stability in water at physiological pH of ferric complex of TAME5OX indicates that these complexes are resistant to hydrolysis and therefore are well suited for the development of device for applications as probes. The ligand displays high sensitive fluorescence enhancement to Al(3+) at pH 7.4, in water. Moreover, TAME5OX can distinguish Al(3+) from Fe(3+) and Cr(3+) via two different sensing mechanisms: photoinduced electron transfer (PET) for Al(3+) and internal charge transfer (ICT) for Fe(3+) and Cr(3+). Density functional theory was employed for optimization and evaluation of vibrational modes, NBO analysis, excitation and emission properties of the different species of metal complexes observed by solution studies.
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Affiliation(s)
- Rifat Akbar
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab 148106, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology Kurukshetra, Haryana 136119, India
| | - B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab 148106, India.
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Bera RK, Baral M, Sahoo SK, Kanungo BK. Spectroscopic, potentiometric and theoretical studies of novel imino-phenolate chelators for Fe(III). Spectrochim Acta A Mol Biomol Spectrosc 2015; 134:165-172. [PMID: 25011043 DOI: 10.1016/j.saa.2014.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 05/25/2014] [Accepted: 06/03/2014] [Indexed: 06/03/2023]
Abstract
The present study was targeted to explore the binding properties of two strong chelators for Fe(III) based on tripodal-iminophenolate moiety. Complexation behavior of the tripodal systems cis-cis cyclohexane-1,3,5-tricarboxylic acid tris-({2-[(2-hydroxy-benzylidene)-amino]-ethyl}-amide (CYCOENSAL, L(1)) and cis-cis cyclohexane-1,3,5-tricarboxylic acid tris-({3-[(2-hydroxy-benzylidene)-amino]-propyl}-amide (CYCOPNSAL, L(2)) is described. Three protonation constants obtained are assigned for three hydroxyl groups of aromatic ring were employed for the evaluation of the formation constants of the metal complexes. Both ligands liberate three protons each forming monomeric complexes of type FeLH3, FeLH2, FeLH and FeL (L=L(1) and L(2)). The first species FeLH3 depicted at low pH, where the ligands were coordinated through three imine nitrogen and other species form subsequently from FeLH3 in steps upon deprotonation and coordination of the phenolic oxygen giving encapsulated tris(phenolate) complexes. The probable structures of the metal complexes formed in solution were proposed through molecular modeling calculations. L(2) was observed to be highly selective towards Fe(III) as compared to L(1).
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Affiliation(s)
- Rati Kanta Bera
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal 148106, Punjab, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana 136119, India
| | - Suban K Sahoo
- Department of Applied Chemistry, S.V. National Institute of Technology (SVNIT), Surat, Gujrat, India
| | - B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal 148106, Punjab, India.
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Akbar R, Baral M, Kanungo BK. Design, synthesis and photophysical properties of 8-hydroxyquinoline-functionalized tripodal molecular switch as a highly selective sequential pH sensor in aqueous solution. RSC Adv 2015. [DOI: 10.1039/c4ra16345a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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] Open
Abstract
TAME5OX can act as a good candidate with potential applications in chemical and biological fields. Fluorescence reduction due to ESIPT between protonated NH+ ∼ –OH and deprotonated N ∼ –O− forms was proven by DFT calculation.
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Affiliation(s)
- Rifat Akbar
- Department of Chemistry
- Sant Longowal Institute of Engineering & Technology
- Longowal
- India
| | - Minati Baral
- Department of Chemistry
- National Institute of Technology Kurukshetra
- India
| | - B. K. Kanungo
- Department of Chemistry
- Sant Longowal Institute of Engineering & Technology
- Longowal
- India
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Akbar R, Baral M, Kanungo BK. Experimental and theoretical approach of photophysical properties of lanthanum(III) and erbium(III) complexes of tris(methoxymethyl)-5-oxine podant. Spectrochim Acta A Mol Biomol Spectrosc 2014; 129:365-376. [PMID: 24747862 DOI: 10.1016/j.saa.2014.03.045] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 03/12/2014] [Accepted: 03/21/2014] [Indexed: 06/03/2023]
Abstract
With the aim of evaluating the coordination behavior of a novel polydentate tripodal ligand, 5-[[3-[(8-hydroxy-5-quinolyl)methoxy]-2-[(8-hydroxy-5-quinolyl)methoxymethyl]-2-methyl propoxy]methyl]quinolin-8-ol (TMOM5OX), towards La(III) and Er(III) metal ions, the detailed investigations of photophysical properties by theoritical and experimental (potentiometric, UV-visible and fluorescence spectrophotometry) methods were carried out. TMOM5OX has been found to form protonated complex [Ln(H4L)](4+) (Ln=La or Er) below pH 3.8, which consecutively deprotonates through one-proton processes with rise of pH. The formation constants (logβ) of neutral complexes have been determined to be 36.42 (LaL) and 35.76, 37.62 (for ErL and ErL2, respectively) and the pLn (pLn=-log[Ln(3+)]) values of 24.6 and 27.1 for La(III) and Er(III) ions, respectively, calculated at pH 7.4, indicating TMOM5OX is a good lanthanide synthetic chelator. The absorption spectroscopy of these complexes show marked spectral variations due to characteristic lanthanide transitions, which support the use of TMOM5OX as a sensitive optical pH based sensor to detect Ln(III) metal ions in biological systems. In addition, these complexes have also been shown to exhibit strong green fluorescence allowing simultaneous sensing within the visible region under physiological pH in competitive medium for both La(III) and Er(III) ions. The intense fluorescence from these compounds were revealed to intermittently get quenched under acidic and basic conditions due to the photoinduced intramolecular electron transfer from excited 8-hydroxyquinoline (8-HQ) moiety to metal ion, just an opposite process. This renders these compounds the OFF-ON-OFF type of pH-dependent fluorescent sensors. The complexes coordination geometries were optimized using the sparkle/PM6 model and the theoretical spectrophotometric studies were carried out in order to validate the experimental findings, based on ZINDO/S methodology at configuration interaction with single excitations (CIS) level. These results clearly attest for the efficacy of the theoretical models employed in all calculations and create new interesting possibilities for the design in-silico of novel and highly efficient lanthanide-organic frameworks.
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Affiliation(s)
- Rifat Akbar
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab 148106, India
| | - Minati Baral
- Department of Chemistry, National Institute of Technology Kurukshetra, Haryana 136119, India
| | - B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal, Punjab 148106, India.
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Akbar R, Baral M, Kanungo B. The influence of europium(III) and terbium(III) on the electronic system of impudent tripodal ligand: Binding, spectrophotometric and theoretical investigations. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.04.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Sahoo SK, Bera RK, Kanungo BK, Baral M. Spectroscopic and pH-metric studies on the complexation of a novel tripodal amine-phenol ligand towards Al(III), Ga(III) and In(III). Spectrochim Acta A Mol Biomol Spectrosc 2012; 89:322-328. [PMID: 22286053 DOI: 10.1016/j.saa.2011.12.049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 12/09/2011] [Accepted: 12/21/2011] [Indexed: 05/31/2023]
Abstract
The aqueous coordination chemistry of a newly synthesized tripodal amine-phenol ligand, cis,cis-1,3,5-tris{(2-hydroxybenzyl)aminomethyl}cyclohexane (THAC) towards H+, Al3+, Ga3+ and In3+ ions have been investigated in aqueous medium of 0.1 M KCl ionic strength and 25±1 °C by potentiometric and spectrophotometric methods. Three protonation constants assigned to phenolic hydroxyl groups were determined and were used as input data to evaluate the formation constants of the metal complexes. The ligand formed various monomeric metal complex species MLH3, MLH2, MLH, ML and MLH(-1) with Ga(III) and In(III); MLH3, ML and MLH(-1) with Al(III). The calculated stability constants followed the order Ga(III)>In(III)>Al(III), and their pM values at physiological condition were found to be higher than the corresponding transferrin complexes.
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Affiliation(s)
- Suban K Sahoo
- Department of Applied Chemistry, S. V. National Institute of Technology, Surat 395 007, Gujarat, India.
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Bera RK, Sahoo SK, Baral M, Kanungo B. A Novel Iron(III) Selective Membrane Electrode Containing a Tripodal Polycatacholamine as Sensor. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.10.3592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kanungo BK, Baral M, Bera RK, Sahoo SK. A new dioxotetraamine ligand derived from binicotinic acid: synthesis, coordination, and fluorescence behaviour towards divalent transition metal ions. Monatsh Chem 2010. [DOI: 10.1007/s00706-009-0235-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kanungo BK, Baral M, Sahoo SK, Muthu SE. Synthesis, spectroscopic and theoretical studies of two novel tripodal imine-phenol ligands and their complexation with Fe(III). Spectrochim Acta A Mol Biomol Spectrosc 2009; 74:544-552. [PMID: 19713149 DOI: 10.1016/j.saa.2009.06.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 06/24/2009] [Accepted: 06/30/2009] [Indexed: 05/28/2023]
Abstract
Two novel tripodal imine-phenol ligands, cis,cis-1,3,5-tris{(2-hydroxybenzilidene)aminomethyl}cyclohexane (TMACHSAL, L(1)) and of cis,cis-1,3,5-tris{[(2-hydroxyphenyl)ethylidene]aminomethyl}cyclohexane (Me(3)-TMACHSAL, L(2)) have been synthesized and characterized by elemental analyses and various spectral (UV-vis, IR and (1)H and (13)C NMR) data. The complexation reactions of the ligands with H(+) and Fe(III) were investigated by potentiometric and spectrophotometric methods at an ionic strength of 0.1M KCl and 25 +/- 1 degrees C in aqueous medium. Three protonation constants each for ligands L(1) and L(2) were determined and were used as input data to evaluate the formation constants of the metal complexes. Formations of metal complexes of the types FeLH(3), FeLH(2), FeLH, FeL and FeLH(-1) were depicted in solution. Experimental evidences suggested for a formation of tris(iminophenolate) type metal complex by the ligands. The ligand L(1) showed higher affinity towards iron(III) than L(2). The pFe value related to L(1) (pFe = 20.14) is approximately four units higher than L(2) (pFe = 16.41) at pH = 7.4. The structures of the metal complexes were proposed through the molecular mechanics calculation using MM3 force field followed by semi-empirical PM3 method.
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Affiliation(s)
- B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology (Deemed to-be University), Longowal 148106, Punjab, India.
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Sahoo SK, Baral M. Dioxotetraamines derived molecular and supramolecular devices. Journal of Photochemistry and Photobiology C: Photochemistry Reviews 2009. [DOI: 10.1016/j.jphotochemrev.2008.11.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kanungo BK, Sahoo SK, Baral M. Spectroscopic, potentiometric and theoretical studies on the binding properties of a novel tripodal polycatechol-imine ligand towards iron(III). Spectrochim Acta A Mol Biomol Spectrosc 2008; 71:1452-1460. [PMID: 18603469 DOI: 10.1016/j.saa.2008.05.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Revised: 04/28/2008] [Accepted: 05/06/2008] [Indexed: 05/26/2023]
Abstract
A novel multidentate tripodal ligand, cis,cis-1,3,5-tris[(2,3-dihydroxybenzylidene)aminomethyl]cyclohexane (TDBAC, L) containing one catechol unit in each arms of a tripodal amine, cis,cis-1,3,5-tris(aminomethyl)cyclohexane was investigated as a chelator for iron(III) through potentiometric and spectrophotometric methods in an aqueous medium of 0.1N ionic strength and 25+/-1 degrees C as well as in ethanol by continuous variation method. From pH metric in water, three protonation constants characterized for the three-hydroxyl groups of the catechol units at ortho were used as input data to evaluate the stability constants of the complexes. Formation of monomeric complexes FeLH3, FeLH2, FeLH and FeL were depicted. In ethanol, formation of complexes FeL, Fe2L and Fe3L were characterized. Structures of the complexes were explained by using the experimental evidences and predicted through molecular modeling calculations. The ligand showed potential to coordinate iron(III) through three imine nitrogens and three catecholic oxygens at ortho to form a tris(iminocatecholate) type complex.
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Affiliation(s)
- B K Kanungo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Deemed to-be University, Longowal 148106, India.
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Sahoo SK, Muthu SE, Baral M, Kanungo BK. Potentiometric and spectrophotometric study of a new dipodal ligand N,N'-bis{2-[(2-hydroxybenzylidine)amino]ethyl}malonamide with Co(II), Ni(II), Cu(II) and Zn(II). Spectrochim Acta A Mol Biomol Spectrosc 2006; 63:574-86. [PMID: 16024268 DOI: 10.1016/j.saa.2005.06.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2005] [Revised: 05/18/2005] [Accepted: 06/04/2005] [Indexed: 05/03/2023]
Abstract
A new dipodal ligand, N,N'-bis{2-[(2-hydroxybenzylidine)amino]ethyl}malonamide (BHAEM) was synthesized by Schiff base condensation of N,N'-bis(2-aminoethyl)malonamide with two equivalent of salicylaldehyde and characterized on the basis of elemental analyses and various spectral (UV-vis, IR, (1)H NMR and (13)C NMR) data. The complexation reaction of the ligand with H(+), Co(II), Ni(II), Cu(II) and Zn(II) in solution was investigated by spectrophotometric and potentiometric method. Two protonation constants of BHAEM assigned for two hydroxyl groups of aromatic ring were determined and its hydrolysis mechanism was proposed through potentiometric result. In presence of metal ions, BHAEM shows different coordination properties. All metal ions form ML type complex where the ligand coordinates to the metal ion through two N-amine and two O-phenolate groups. In addition, Ni(II) and Cu(II) form additional complex species of the type MLH(-1) and MLH(-2), respectively due to ionization of amide protons. The molecular geometry of BHAEM was examined theoretically using the molecular mechanics MM3 force field followed by semi-empirical PM3 method and various spectral data UV-vis, IR and (1)H NMR were calculated from the energy-minimized structure applying semi-empirical ZINDO, PM3 and TNDO/2 method, respectively and compared with the experimental data. The probable structure of metal complexes in solution were proposed through calculated minimum strain energy by applying molecular mechanics MM(+) force field coupled with molecular dynamics simulation. Further the proposed structure of Cu(BHAEM) was refined through semi-empirical AM1/d method.
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Affiliation(s)
- Suban K Sahoo
- Department of Chemistry, Sant Longowal Institute of Engineering & Technology, Longowal 148106, Punjab, India
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Kanungo B, Baral M, Kaur M. Ternary complexes of some trivalent lanthanides with trans-1,2-cyclohexylene-dinitrilotetraacetate and camphorate ion. J Inorg Biochem 1995. [DOI: 10.1016/0162-0134(95)97230-n] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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