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Thanoon RD, Ibadi EA, Ahmad I, Alamir HTA, Alwan M, Hashim FS, Khaled DW, Alkhafaji AT, Asiri M, Alsaalamy A. Experimental and theoretical investigations of Erbium complex: DNA/BSA interaction, anticancer and antibacterial studies. Front Chem 2023; 11:1266520. [PMID: 37701051 PMCID: PMC10493310 DOI: 10.3389/fchem.2023.1266520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 08/14/2023] [Indexed: 09/14/2023] Open
Abstract
To assess the biological potential of an Er complex that contains a 2,2'-bipyridine ligand, various techniques such as multispectral and molecular modeling procedures were utilized to examine its DNA-binding ability, BSA binding affinity, antimicrobial effects, and anticancer properties. By analyzing fluorescent information and employing the vant' Hoff equation, important parameters such as the innate docking coefficient (Kb), Stern-Volmer coefficient (KSV), and thermodynamic properties including modifications in liberated energy (ΔG°), enthalpy (∆H°), and entropy (∆S°) were determined. The trial findings suggest that the compound can bind to DNA, primarily through groove binding. Additionally, the engagement between the Er compound and the protein BSA was examined using emission spectroscopy technique, revealing a powerful binding affinity between the compound and BSA. The Er complex binds to BSA primarily via hydrogen links and van der Waals forces, as indicated by the adverse values of ΔH° and ∆S°. Through a static quenching process, the complex significantly reduces the intrinsic fluorescence of BSA. Molecular binding calculations and rivalrous binding trials confirm that this compound dock to hydrophobic remains found in site III of BSA. Additionally, the Er complex demonstrates promising results in terms of its anticancer and antimicrobial activities based on screening tests.
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Affiliation(s)
- Raid D. Thanoon
- Department of Medical Biochemical Analysis, Cihan University-Erbil, Kurdistan Region, Iraq
| | - Emam Atiyah Ibadi
- Department of Pharmacy, Al-Mustaqbal University College, Babylon, Iraq
| | - Irfan Ahmad
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha, Saudi Arabia
| | | | - Marim Alwan
- Medical Lab Techniques, College of Medical Technology, Al-Farahidi University, Baghdad, Iraq
| | - Furqan S. Hashim
- Department of Medical Laboratories Technology, Al-Nisour University College, Baghdad, Iraq
| | | | | | - Mohammed Asiri
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha, Saudi Arabia
| | - Ali Alsaalamy
- College of Technical Engineering, Imam Ja’afar Al‐Sadiq University, Baghdad, Iraq
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Khatun R, Modak R, Islam ASM, Moni D, Sepay N, Mukherjee R, Das G, Murmu N, Ali M. Small Molecule Interactions with Biomacromolecules: DNA Binding Interactions of a Manganese(III) Schiff Base Complex with Potential Anticancer Activities. ACS APPLIED BIO MATERIALS 2023; 6:3176-3188. [PMID: 37548990 DOI: 10.1021/acsabm.3c00297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
A manganese(III) complex, [MnIII(L)(SCN)(enH)](NO3)·H2O (1•H2O) (H2L = 2-((E)-(2-((E)-2-hydroxy-3-methoxybenzylidene-amino)-ethyl-imino)methyl)-6-methoxyphenol), has been synthesized and characterized by single-crystal X-ray diffraction analysis. The interaction of 1•H2O with DNA was studied by monitoring the decrease in absorbance of the complex at λ = 324 nm with the increase in DNA concentration, providing an opportunity to determine the binding constant of the 1•H2O-ct-DNA complex as 5.63 × 103 M-1. Similarly, fluorescence titration was carried out by adding ct-DNA gradually and monitoring the increase in emission intensity at 453 nm on excitation at λex = 324 nm. A linear form of the Benesi-Hildebrand equation yields a binding constant of 4.40 × 103 M-1 at 25 °C, establishing the self-consistency of our results obtained from absorption and fluorescence titrations. The competitive displacement reactions of dyes like ethidium bromide, Hoechst, and DAPI (4',6-diamidine-2'-phenylindole dihydrochloride) from dye-ct-DNA conjugates by 1•H2O were analyzed, and the corresponding KSV values are 1.05 × 104, 1.25 × 104, and 1.35 × 104 M-1 and the Kapp values are 2.16 × 103, 8.34 × 103, and 9.0 × 103 M-1, from which it is difficult to infer the preference of groove binding over intercalation by these DNA trackers. However, the molecular docking experiments and viscosity measurement clearly indicate the preference for minor groove binding over intercalation, involving a change in Gibbs free energy of -8.56 kcal/mol. The 1•H2O complex was then evaluated for its anticancer potential in breast cancer MCF-7 cells, which severely abrogates the growth of the cells in both 2D and 3D mammospheres, indicating its promising application as an anticancer drug through a minor groove binding interaction with ct-DNA.
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Affiliation(s)
- Rousunara Khatun
- Department of Chemistry, Jadavpur University, 188, Raja S. C. Mullick Road, Kolkata, West Bengal 700 032, India
- Aliah University, ll-A/27, Action Area II, Newtown, Action Area II, Kolkata, West Bengal 700160, India
| | - Ritwik Modak
- Department of Chemistry, Manipal Academy of Higher Education, Manipal Institute of Technology Bengaluru, Manipal 560064, India
| | - Abu Saleh Musha Islam
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2B, Raja S.C. Mullick Road, Kolkata, West Bengal 700032, India
| | - Dolan Moni
- Department of Chemistry, Jadavpur University, 188, Raja S. C. Mullick Road, Kolkata, West Bengal 700 032, India
| | - Nayim Sepay
- Department of Chemistry, Lady Brabourne College, Kolkata, West Bengal 700 017, India
| | - Rimi Mukherjee
- Department of Signal Transduction and Biogenic Amines, Chittanranjan National Cancer Institute, 37, S.P. Mukherjee Road, Kolkata, West Bengal 700 026, India
| | - Gaurav Das
- Department of Signal Transduction and Biogenic Amines, Chittanranjan National Cancer Institute, 37, S.P. Mukherjee Road, Kolkata, West Bengal 700 026, India
| | - Nabendu Murmu
- Department of Signal Transduction and Biogenic Amines, Chittanranjan National Cancer Institute, 37, S.P. Mukherjee Road, Kolkata, West Bengal 700 026, India
| | - Mahammad Ali
- Department of Chemistry, Jadavpur University, 188, Raja S. C. Mullick Road, Kolkata, West Bengal 700 032, India
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Ansari AA, Muthumareeswaran M, Lv R. Coordination chemistry of the host matrices with dopant luminescent Ln3+ ion and their impact on luminescent properties. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214584] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Luminescent lanthanide nanocomposites in thermometry: Chemistry of dopant ions and host matrices. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214040] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Ansari AA, Parchur AK, Thorat ND, Chen G. New advances in pre-clinical diagnostic imaging perspectives of functionalized upconversion nanoparticle-based nanomedicine. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213971] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Ansari AA, Parchur AK, Labis JP, Shar MA, Khan A. Highly hydrophilic CaF2:Yb/Er upconversion nanoparticles: Structural, morphological, and optical properties. J Fluor Chem 2021. [DOI: 10.1016/j.jfluchem.2021.109820] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Asadpour S, Aramesh-Boroujeni Z, Jahani S. In vitro anticancer activity of parent and nano-encapsulated samarium(iii) complex towards antimicrobial activity studies and FS-DNA/BSA binding affinity. RSC Adv 2020; 10:31979-31990. [PMID: 35518188 PMCID: PMC9056537 DOI: 10.1039/d0ra05280a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 08/11/2020] [Indexed: 11/21/2022] Open
Abstract
Based on the potential anticancer properties of lanthanide complexes, the anticancer activity of the Sm(iii) complex containing a 2,2′-bipyridine ligand (bpy) and its interaction with FS-DNA (Fish-Salmon DNA) and BSA (Bovine Serum Albumin) were examined experimentally and by molecular docking in this paper. Absorption and fluorescence spectroscopic methods were used to define the thermodynamic parameters, binding constant (Kb), and the probable binding mechanism. It was concluded that the Sm complex interacts with FS-DNA through a minor groove with a Kb of 105 M−1. Also, the Kb for the BSA binding at 298 K was found to be 5.89 × 105 M−1, showing relatively a high tendency of the Sm complex to DNA and BSA. Besides, the Sm complex was docked to BSA and DNA by the autodock program. The results of the docking calculations were in good agreement with the experimental examinations. Additionally, the antifungal and antibacterial properties of this complex were investigated. The anticancer tests on the effect of the Sm complex, starch nano-encapsulation, and lipid nano-encapsulation in MCF-7 and A-549 cell lines were performed by the MTT method. It can be observed that the Sm complex and its nanocarriers presented a selective inhibitory effect on various cancer cell growths. The biological properties of the Sm-complex, such as its interaction with FS-DNA and BSA, anticancer, and antimicrobial activities were studied.![]()
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Affiliation(s)
- Saeid Asadpour
- Department of Chemistry
- Faculty of Sciences
- Shahrekord University
- Shahrekord 115
- Iran
| | - Zahra Aramesh-Boroujeni
- Department of Clinical Laboratory
- AlZahra Hospital
- Isfahan University of Medical Sciences
- Iran
- Young Researchers and Elite Club
| | - Shohreh Jahani
- Noncommunicable Diseases Research Center
- Bam University of Medical Sciences
- Bam
- Iran
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Jahani S, Noroozifar M, Khorasani-Motlagh M, Torkzadeh-Mahani M, Adeli-Sardou M. In vitro cytotoxicity studies of parent and nanoencapsulated Holmium-2,9-dimethyl-1,10-phenanthroline complex toward fish-salmon DNA-binding properties and antibacterial activity. J Biomol Struct Dyn 2019; 37:4437-4449. [DOI: 10.1080/07391102.2018.1557077] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Shohreh Jahani
- Nano Bioeletrochemistry Research Center, Bam University of Medical Sciences, Bam, Iran
| | - Meissam Noroozifar
- Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran
| | | | - Masoud Torkzadeh-Mahani
- Department of Biotechnology, Institute of Science, High Technology & Environmental Science, Graduate University of Advance Technology, Kerman, Iran
| | - Mahboubeh Adeli-Sardou
- Department of Biotechnology, Institute of Science, High Technology & Environmental Science, Graduate University of Advance Technology, Kerman, Iran
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Varam Y, Rajkumari L. Complexation studies of N′-[(1E)-1-phenylethylidene]isonicotinohydrazide: An aroylhydrazone Schiff base and lanthanides. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.11.098] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Gowda V, Sarma B, Öberg S, Telkki VV, Larsson AC, Lantto P, Antzutkin ON. Structure Elucidation of an Yttrium Diethyldithiocarbamato-Phenanthroline Complex by X-ray Crystallography, Solid-State NMR, and ab-initio Quantum Chemical Calculations. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600059] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Vasantha Gowda
- Chemistry of Interfaces; Division of Chemical Engineering; Luleå University of Technology; 97187 Luleå Sweden
- NMR Research Group; Faculty of Science, University of Oulu; P. O. Box 3000 90014 Oulu Finland
| | - Bipul Sarma
- Department of Chemical Sciences; Tezpur University; 784028 Tezpur Assam India
| | - Sven Öberg
- Engineering Sciences and Mathematics; Division of Material Science; Luleå University of Technology; 97187 Luleå Sweden
| | - Ville-Veikko Telkki
- NMR Research Group; Faculty of Science, University of Oulu; P. O. Box 3000 90014 Oulu Finland
| | - Anna-Carin Larsson
- Chemistry of Interfaces; Division of Chemical Engineering; Luleå University of Technology; 97187 Luleå Sweden
| | - Perttu Lantto
- NMR Research Group; Faculty of Science, University of Oulu; P. O. Box 3000 90014 Oulu Finland
| | - Oleg N. Antzutkin
- Chemistry of Interfaces; Division of Chemical Engineering; Luleå University of Technology; 97187 Luleå Sweden
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Jahani S, Khorasani-Motlagh M, Noroozifar M. DNA interaction of europium(III) complex containing 2,2′-bipyridine and its antimicrobial activity. J Biomol Struct Dyn 2015; 34:612-24. [DOI: 10.1080/07391102.2015.1048481] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Hatanaka M, Yabushita S. Mechanisms of f–f hypersensitive transition intensities of lanthanide trihalide molecules: a spin–orbit configuration interaction study. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1517-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ali I, Wani WA, Saleem K. Empirical Formulae to Molecular Structures of Metal Complexes by Molar Conductance. ACTA ACUST UNITED AC 2013. [DOI: 10.1080/15533174.2012.756898] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Imran Ali
- a Department of Chemistry, Jamia Millia Islamia (Central University) , New Delhi , India
| | - Waseem A. Wani
- a Department of Chemistry, Jamia Millia Islamia (Central University) , New Delhi , India
| | - Kishwar Saleem
- a Department of Chemistry, Jamia Millia Islamia (Central University) , New Delhi , India
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Ilmi R, Iftikhar K. Luminescent nine-coordinate lanthanide complexes derived from fluorinated β-diketone and 2,4,6-tris(2-pyridyl)-1,3,5-triazine. J COORD CHEM 2012. [DOI: 10.1080/00958972.2011.649737] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Rashid Ilmi
- a Department of Chemistry , Jamia Millia Islamia , New Delhi 110 025 , India
| | - K. Iftikhar
- a Department of Chemistry , Jamia Millia Islamia , New Delhi 110 025 , India
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Ansari AA. Paramagnetic NMR shift, spectroscopic and molecular modeling studies of lanthanide(III)-morin complexes. J COORD CHEM 2008. [DOI: 10.1080/00958970802178265] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Anees A. Ansari
- a National Physical Laboratory , Dr. K. S. Krishnan Marg, New Delhi, 110012, India
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Ansari AA. 1H NMR and spectroscopic studies of biologically active yttrium (III)-flavonoid complexes. MAIN GROUP CHEMISTRY 2008. [DOI: 10.1080/10241220802357139] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ansari AA. 1H NMR, spectroscopic and molecular modeling studies on paramagnetic lanthanide(III)-quercetin complexes. MAIN GROUP CHEMISTRY 2008. [DOI: 10.1080/10241220801890072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ansari AA. DFT and1H NMR molecular spectroscopic studies on biologically anti-oxidant active paramagnetic lanthanide(III)-chrysin complexes. MAIN GROUP CHEMISTRY 2008. [DOI: 10.1080/10241220801912637] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ansari AA, Hussain HA, Iftikhar K. Optical absorption spectroscopic studies on holmium(III) complexes with beta-diketone and heterocyclic amines: the environment effect on 4f-4f hypersensitive transitions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 68:1305-12. [PMID: 17419092 DOI: 10.1016/j.saa.2007.02.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2006] [Revised: 01/15/2007] [Accepted: 02/08/2007] [Indexed: 05/14/2023]
Abstract
The optical absorption spectra of [Ho(acac)(3)(H(2)O)(2)].H(2)O, [Ho(acac)(3)phen] and [Ho(acac)(3)bpy] (where acac is the anion of acetylacetone; phen is 1,10-phenanthroline and bpy is 2,2'-bipyridyl) complexes in the visible region, in a series of non-aqueous solvents (methanol, ethanol, isopropanol, chloroform, acetonitrile and pyridine.) have been analyzed. The largest intensity variation was observed in the (5)G(6)<--(5)I(8) (centered at 450 nm), and (5)G(5), (3)H(5), (3)H(6)<--(5)I(8) (centered at 360 nm) transition regions. The band shape and oscillator strength of the hypersensitive transitions display pronounced changes as compared to Ho(3+) aqua-ion. The band shapes of the hypersensitive transitions show remarkable changes on passing from aqueous solution to various non-aqueous solutions which is the result of change in the environment about the Ho(III) ion in the various solutions and suggests coordination of solvent molecule(s), in some cases. The results clearly show that among the solvents studied pyridine is the most effective in promoting the 4f-4f spectral intensity. It has been inferred from this study that 2,2'-bipyridyl is a stronger ligand for heavier lanthanides. A comparative account of hypersensitivity in the present complexes with those of other adducts of Ho(beta-diketoenolate)(3) with heterocyclic amines is discussed. The TGA analyses showed that the phen complex is thermally more stable over its bpy analogue.
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Affiliation(s)
- A A Ansari
- Department of Chemistry, Jamia Millia Islamia, New Delhi, India
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Ansari AA, Ahmed Z, Iftikhar K. Nuclear magnetic resonance and optical absorption spectroscopic studies on paramagnetic praseodymium(III) complexes with beta-diketone and heterocyclic amines. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 68:176-83. [PMID: 17267279 DOI: 10.1016/j.saa.2006.11.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2006] [Revised: 11/14/2006] [Accepted: 11/15/2006] [Indexed: 05/13/2023]
Abstract
The optical absorption spectra of [Pr(acac)(3)(H(2)O)(2)].H(2)O, [Pr(acac)(3)phen.H(2)O] and [Pr(acac)(3)bpy] (where acac is the anion of acetylacetone, phen is 1,10-phenanthroline and bpy is 2,2'-bipyridyl) have been analyzed in the visible region in a series of non-aqueous solvents (methanol, ethanol, isopropanol, chloroform, acetonitrile and pyridine). The complexes display four non-hypersensitive 4f-4f transitions ((3)P(2), (3)P(1)+(1)I(6), (3)P(0) and (1)D(2)) from the (3)H(4) ground state. The band shape of the transitions shows remarkable changes upon dissolving in different solvents. Distinctively different band shapes have been observed for phen and bpy complexes. The phen is more effective in producing changes and the splitting of the bands is more pronounced in phen complex since it is a stronger ligand and leads to stronger Pr-N(phen) bond. The splitting of the bands is indicative of partaking of f-orbitals in bonding. The NMR signals of heterocyclic amines have been shifted to high fields while the resonances due to acetylacetone moiety have moved to low fields which is the consequence of change in geometry of the complexes upon coordination of the heterocyclic amines and reflects the importance of geometric factor (3cos(2)theta-1) in changing sign of the shift and to a good approximation the shifts arise predominantly from the dipolar mechanism. The phen complexes have narrower line width than bpy complexes. The line broadening in the case of bpy complexes is suggestive of exchange between inter-converting forms. The bpy possesses some degree of rotational freedom about C(6)-C(6') bond and the two pyridine rings undergo scissoring motion with respect to each other.
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Affiliation(s)
- A A Ansari
- Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India
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Ansari AA, Irfanullah M, Iftikhar K. Optical absorption and NMR spectroscopic studies on paramagnetic neodymium(III) complexes with beta-diketone and heterocyclic amines. The environment effect on 4f-4f hypersensitive transitions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 67:1178-88. [PMID: 17158088 DOI: 10.1016/j.saa.2006.10.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2006] [Revised: 09/28/2006] [Accepted: 10/05/2006] [Indexed: 05/12/2023]
Abstract
The optical absorption spectra of [Nd(acac)3(H2O)2].H2O, [Nd(acac)3bpy] and [Nd(acac)3phen(H2O)2] (where acac=acetylacetone, bpy=2,2'-bipyridyl and phen=1,10-phenanthroline) complexes in the visible region, in a series of non-aqueous solvents (methanol, ethanol, isopropanol, chloroform, acetonitrile, pyridine, nitrobenzene and dimethylsulphoxide) have been analyzed. The transition 4G(5/2)<--4I(9/2) (Nd-VI) located near the middle of the visible region (17,500 cm(-1)) is hypersensitive. Its behavior is in sharp contrast to many other typically weak and consistently unvaried, normal 4f-4f transitions. The oscillator strength of this transition for the chelate as well as its adducts with phen and bpy in any of the solvent employed is larger than the oscillator strength of Nd3+ aqua-ion. It is most intense in pyridine for all the complexes studied and, therefore, pyridine is the most effective in promoting f-f spectral intensity. The band shape and oscillator strength of the hypersensitive transitions display pronounced changes as compared to Nd3+ aqua-ion. The band shapes of the hypersensitive transitions show remarkable changes on passing from aqueous solution to various non-aqueous solutions, which is the result of change in the environment about the Nd(III) ion in the various solutions and suggests change in the environment about the Nd(III) ion in the various solutions and suggests coordination of solvent molecule(s), in some cases. A comparative account of hypersensitivity in the present complexes with those of other adducts of Nd(beta-diketoenolate)3 with heterocyclic amines is discussed. The NMR signals of heterocyclic amines have been shifted to high fields while the resonances due to acetylacetone moiety have moved to low fields. The paramagnetic shift in the complexes is dipolar in nature.
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Affiliation(s)
- A A Ansari
- Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India
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Abu-Hussen AAA. Synthesis and spectroscopic studies on ternary bis-Schiff-base complexes having oxygen and/or nitrogen donors. J COORD CHEM 2007. [DOI: 10.1080/00958970500266230] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Azza A. A. Abu-Hussen
- a Department of Chemistry , Girl's College for Art, Science and Education , Ain Shams University , Cairo, Egypt
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