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Borrisov B, Tsvetkov M, Zahariev T, Elenkova D, Morgenstern B, Dimov D, Kukeva R, Trendafilova N, Georgieva I. Effect of Pyrrolidinedithiocarbamate Ligand on the Luminescence Properties of Heteroligand Samarium and Europium Complexes: Experimental and Theoretical Study. Inorg Chem 2024; 63:13840-13864. [PMID: 38996195 DOI: 10.1021/acs.inorgchem.4c00134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2024]
Abstract
The photophysical properties of two isostructural heteroligand lanthanide complexes of general formula Ln(pdtc)3(phen) (pdtc = pyrrolidinedithiocarbamate anion, phen = 1,10-phenanthroline), Ln = Sm3+ (1), Eu3+ (2)) were studied in solid state and dichloromethane (DCM) solution. The two lanthanide complexes were investigated by experimental techniques for structural (single-crystal X-ray diffraction analysis of 1, powder XRD, TG-DTA) and spectroscopic [electron paramagnetic resonance (EPR), infrared (IR), ultraviolet-visible (UV-vis), photoluminescence (PL)] characterization. DFT/TDDFT/ωB97xD and multireference SA-CASSCF/NEVPT2 calculations with perturbative spin-orbit coupling corrections were applied to construct the Jablonski energy diagrams and to discuss the excited state energy transfer mechanism with competing excited state processes and possible sensitized mechanism of metal-centered emission. The first excited state (S1) involved in the excited state energy transfer L(antenna)-to-Ln was predicted to have interligand (pdtc-to-phen) charge transfer character in contrast to the previously predicted ligand-to-metal charge transfer character. The theoretical consideration showed similar relaxation paths and luminescence quenching channels and appropriate Donor*(phen)-Acceptor*(Ln3+) energy gap for 1 and 2. The experimental measurements in the solid state, however, showed efficient luminescence and good ability to convert UV to visible light only for the Sm(pdtc)3(phen) complex. The minor emission of 2 was explained by partial reduction of Eu3+, confirmed by EPR and calculated electron density distribution data.
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Affiliation(s)
- Boris Borrisov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 11, Acad. G. Bonchev str., 1113 Sofia, Bulgaria
| | - Martin Tsvetkov
- Faculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, 1 James Bourchier blvd., 1164 Sofia, Bulgaria
| | - Tsvetan Zahariev
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 11, Acad. G. Bonchev str., 1113 Sofia, Bulgaria
| | - Denitsa Elenkova
- Faculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, 1 James Bourchier blvd., 1164 Sofia, Bulgaria
| | - Bernd Morgenstern
- Inorganic Solid State Chemistry, Saarland University, Campus Geb. C4 1, 66123 Saarbrücken, Germany
| | - Deyan Dimov
- Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 109, Acad. G. Bonchev str., 1113 Sofia, Bulgaria
| | - Rositsa Kukeva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 11, Acad. G. Bonchev str., 1113 Sofia, Bulgaria
| | - Natasha Trendafilova
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 11, Acad. G. Bonchev str., 1113 Sofia, Bulgaria
| | - Ivelina Georgieva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 11, Acad. G. Bonchev str., 1113 Sofia, Bulgaria
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Malik S, Jakhar K, Singh D, Hooda A, Redhu S, Dalal S, Aggarwal V, Kumar S, Malik RS, Kumar P. Optimizing white light emission in Dy(iii) complexes: impact of energy transfer from mono and bidentate ligands on luminescence. RSC Adv 2024; 14:22642-22655. [PMID: 39027040 PMCID: PMC11255562 DOI: 10.1039/d4ra03897e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Accepted: 07/11/2024] [Indexed: 07/20/2024] Open
Abstract
Complexes of dysprosium(iii) ions with 1,1,1,5,5,5-hexafluoro-2,4-pentanedione featuring various mono and bi-dentate neutral ligands have been prepared and thoroughly investigated. The synthesized complexes exhibit an octa-coordinated environment, achieved by stoichiometrically combining organic ligands and Dy(iii) ions. This octa-coordination environment of Dy(iii) ion was confirmed by FT-IR spectroscopy, thermogravimetry and elemental analysis. Near-white light (NWL) is emitted when complexes were exposed to UV radiation, indicating a significant flow of energy from the sensitizing moieties towards the Dy(iii) ion. This NWL emission might have resulted due to a balance between the intensities corresponding to emission peaks at 480 nm (blue) and 575 nm (yellow) in Dy1-Dy3. Emission spectra recorded at different excitation wavelength were utilized to study the tunability of CIE color coordinates. In addition to their high thermal stability, the complexes display bipolar paramagnetic shifts in their NMR spectra. The 4F9/2 → 6H13/2 transition, contributing ∼62% of the total emission, stands out as a promising candidate for laser amplification due to its dominance in the emission spectra. Additionally, NWL emission observed in a solid Dy(iii) complex opens intriguing possibilities for its application in next-generation white-light emitting devices.
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Affiliation(s)
- Sofia Malik
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 Haryana India
| | - Komal Jakhar
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 Haryana India
| | - Devender Singh
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 Haryana India
| | - Anjli Hooda
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 Haryana India
| | - Sonia Redhu
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 Haryana India
| | - Swati Dalal
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 Haryana India
| | - Vandana Aggarwal
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 Haryana India
| | - Sumit Kumar
- Department of Chemistry, DCR University of Science & Technology Murthal 131039 Haryana India
| | - Rajender Singh Malik
- Department of Chemistry, DCR University of Science & Technology Murthal 131039 Haryana India
| | - Parvin Kumar
- Department of Chemistry, Kurukshetra University Kurukshetra 136119 Haryana India
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Malik S, Jakhar K, Singh D, Dalal S, Hooda A, Nehra K, Kumar S, Malik RS, Kumar P. Exploring the role of neutral ligands in modulating the photoluminescence of samarium complexes with 1,1,1,5,5,5-hexafluoro-2,4-pentanedione. LUMINESCENCE 2024; 39:e4810. [PMID: 38965929 DOI: 10.1002/bio.4810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 04/13/2024] [Accepted: 06/10/2024] [Indexed: 07/06/2024]
Abstract
Four eight-coordinated luminescent samarium complexes of type [Sm(hfpd)3L2] and [Sm(hfpd)3L'] [where hfpd = 1,1,1,5,5,5-Hexafluoro-2,4-pentanedione L = tri-octyl-phosphine oxide (TOPO) and L' = 1,10-phenanthroline (phen), neocuproine (neoc) and bathocuproine (bathoc) were synthesized via a stoichiometrically controlled approach. This allows for precise control over the stoichiometry of the complexes, leading to reproducible properties. This investigation focuses on understanding the impact of secondary ligands on the luminescent properties of these complexes. Infrared (IR) spectra provided information about the molecular structures, whereas 1H and 13C nuclear magnetic resonance (NMR) spectra confirmed these structural details along with the coordination of ligands to trivalent Sm ion. The UV-vis spectra revealed the molar absorption coefficient and absorption bands associated with the hfpd ligand and photoluminescence (PL) spectroscopy demonstrated intense orange-red emission (648 nm relative to 4G5/2 → 6H9/2) from the complexes. The Commission Internationale de l'Éclairage (CIE) triangles indicated that the complexes emitted warm orange red light with color coordinates (x, y) ranging from (0.62, 0.36) to (0.40, 0.27). The investigation of the band gap as well as color parameters confirms the utility of these complexes in displays and LEDs.
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Affiliation(s)
- Sofia Malik
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Komal Jakhar
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Devender Singh
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Swati Dalal
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Anjli Hooda
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Kapeesha Nehra
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Sumit Kumar
- Department of Chemistry, DCR University of Science & Technology, Murthal, India
| | | | - Parvin Kumar
- Department of Chemistry, Kurukshetra University Kurukshetra, Thanesar, India
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Hooda A, Singh D, Nehra K, Dalal A, Kumar S, Malik RS, Rathi B, Kumar P. Luminescent Tb(III) complexes with Lewis bases for displays: Synthesis and spectral investigation. INORG CHEM COMMUN 2023. [DOI: 10.1016/j.inoche.2023.110583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
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Hooda A, Singh D, Dalal A, Nehra K, Kumar S, Malik RS, Kumar R, Kumar P. Optical, electrochemical and photophysical analyses of heteroleptic luminescent Ln(iii) complexes for lighting applications. RSC Adv 2023; 13:9033-9045. [PMID: 36950083 PMCID: PMC10025952 DOI: 10.1039/d3ra00214d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 03/10/2023] [Indexed: 03/24/2023] Open
Abstract
A series of lanthanide complexes have been synthesized with fluorinated 1,3-diketones and heteroaromatic ancillary moieties. Spectroscopic studies reveal the attachment of the respective lanthanide ion to the oxygen site of β-diketone and nitrogen site of auxiliary moieties. The conducting behavior of the complexes is proposed by their optical energy gaps which lie in the range of semiconductors. The emission profiles of the lanthanide complexes demonstrate red and green luminescence owing to the distinctive transitions of Sm3+ and Tb3+ ions, respectively. Energy transfer via antenna effect clearly reveals the effective transfer of energy from the chromophoric moiety to the Ln3+ ion. The prepared conducting and luminescent Ln(iii) complexes might be employed as the emitting component in designing OLEDs.
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Affiliation(s)
- Anjli Hooda
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 India
| | - Devender Singh
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 India
| | - Anuj Dalal
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 India
| | - Kapeesha Nehra
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 India
| | - Sumit Kumar
- Department of Chemistry, DCR University of Science & Technology Murthal Haryana 131039 India
| | - Rajender Singh Malik
- Department of Chemistry, DCR University of Science & Technology Murthal Haryana 131039 India
| | - Ramesh Kumar
- Department of Chemistry, Kurukshetra University Kurukshetra 136119 Haryana India
| | - Parvin Kumar
- Department of Chemistry, Kurukshetra University Kurukshetra 136119 Haryana India
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Hooda A, Singh D, Dalal A, Nehra K, Kumar S, Singh Malik R, Kumar R, Kumar P. Preparation, Spectral and Judd Ofelt Analyses of Luminous Octa-coordinated Europium (III) Complexes. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
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Photophysical Characteristics of Eu(III) 1,3-diketonates with substituted 1,10-phenanthroline auxiliary moieties: Experimental and Theoretical Approach. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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Luminous lanthanide diketonates: Review on synthesis and optoelectronic characterizations. Inorganica Chim Acta 2023. [DOI: 10.1016/j.ica.2023.121406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Nehra K, Dalal A, Hooda A, Saini RK, Singh D, Kumar S, Malik RS, Kumar R, Kumar P. Synthesis of green emissive terbium(III) complexes for displays: Optical, electrochemical and photoluminescent analysis. LUMINESCENCE 2023; 38:56-63. [PMID: 36511827 DOI: 10.1002/bio.4423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/31/2022] [Accepted: 12/06/2022] [Indexed: 12/15/2022]
Abstract
A series of heteroleptic terbium(III) complexes with fluorinated 2-thenoyltrifluoroacetone (TTFA) and other heteroaromatic units have been synthesized. The developed heteroleptic complexes were inspected via elemental study, cyclic voltammetry, thermal analysis and spectroscopic investigations. Optical band-gap data proposed the conducting property of prepared complexes. The photoluminescence emission profiles illustrated peaks based on terbium(III) cation (Tb3+ ) positioned at ~617, 586, 546 and 491 nm, imputed to 5 D4 to 7 FJ (J = 3,4,5,6) transitions separately. Most intense peak at 546 nm corresponding to 5 D4 → 7 F5 transition is accountable for the green emissive character of developed complexes. The luminous character of complexes reveals the sensitization of Tb3+ by ligands. Color parameters further corroborates the green emanation of Tb3+ complexes. The photometric characteristics of complexes recommended their usages in designing display devices.
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Affiliation(s)
- Kapeesha Nehra
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Anuj Dalal
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Anjli Hooda
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Raman Kumar Saini
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Devender Singh
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Sumit Kumar
- Department of Chemistry, DCR University of Science & Technology, Murthal, India
| | | | - Ramesh Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra, India
| | - Parvin Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra, India
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Dalal A, Hooda A, Nehra K, Singh D, Kumar S, Malik RS, Kumar P. Effect of substituted 2,2′-bipyridine derivatives on luminescence characteristics of green emissive terbium complexes: Spectroscopic and optical analysis. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133343] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Hooda A, Dalal A, Nehra K, Kumar P, Singh D, Kumar S, Malik RS, Kumar R, Kumar P. Mononuclear luminous β-diketonate Ln (III) complexes with heteroaromatic auxiliary ligands: Synthesis and luminescent characteristics. LUMINESCENCE 2022; 37:1921-1931. [PMID: 36044585 DOI: 10.1002/bio.4376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 06/29/2022] [Accepted: 06/29/2022] [Indexed: 11/12/2022]
Abstract
A series of lanthanide (samarium and terbium) β-diketonates with heteroaromatic auxiliary ligands have been synthesized. The prepared complexes were characterized through electrochemical, thermal and spectroscopic analyses. Infrared analysis reveals the binding of respective metal ion to oxygen and nitrogen atoms of diketone and ancillary ligands respectively. TG/DTG profiles provide thermal information and specify the high thermal stability of the prepared complexes. The complexes exhibit the sharp and structured Ln-based emission in visible region upon irradiation in UV range. Photophysical analysis demonstrated the green and orange-red emission due to the respective characteristic transitions of Tb3+ and Sm3+ ions. Photophysical properties affirm the luminous behavior of synthesized complexes. These luminous lanthanide complexes could be used as emitting material in designing OLEDs.
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Affiliation(s)
- Anjli Hooda
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Anuj Dalal
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Kapeesha Nehra
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Pawan Kumar
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Devender Singh
- Department of Chemistry, Maharshi Dayanand University, Rohtak, India
| | - Sumit Kumar
- Department of Chemistry, DCR University of Science & Technology, Murthal, Haryana, India
| | - Rajender Singh Malik
- Department of Chemistry, DCR University of Science & Technology, Murthal, Haryana, India
| | - Ramesh Kumar
- Department of Chemistry, Kurukshetra University Kurukshetra, Haryana, India
| | - Parvin Kumar
- Department of Chemistry, Kurukshetra University Kurukshetra, Haryana, India
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Dalal A, Nehra K, Hooda A, Bhagwan S, Kumar Saini R, Singh D, Kumar S. Luminescent heteroleptic samarium (III) complexes: Synthesis, optical and photophysical investigation. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109620] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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