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Ganaie A, Iftikhar K. Theoretical Modeling (Sparkle RM1 and PM7) and Crystal Structures of the Luminescent Dinuclear Sm(III) and Eu(III) Complexes of 6,6,7,7,8,8,8- Heptafluoro-2,2-dimethyl-3,5-octanedione and 2,3-Bis(2-pyridyl)pyrazine: Determination of Individual Spectroscopic Parameters for Two Unique Eu 3+ Sites. ACS OMEGA 2021; 6:21207-21226. [PMID: 34471726 PMCID: PMC8387994 DOI: 10.1021/acsomega.0c05976] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 06/14/2021] [Indexed: 06/13/2023]
Abstract
Heteroleptic homo dinuclear complexes [Sm(fod)3(μ-bpp)Sm(fod)3] and [Eu(fod)3(μ-bpp)Eu(fod)3] and their diamagnetic analogue [Lu(fod)3(μ-bpp)Lu(fod)3] (fod is the anion of 6,6,7,7,8,8,8- heptafluoro-2,2-dimethyl-3,5-octanedione (Hfod) and bpp is 2,3-bis(2-pyridyl)pyrazine) are synthesized and thoroughly characterized. The lanthanum gave a 1:1 adduct of La(fod)3 and bpp with the molecular formula of [La(fod)3bpp]. The 1H NMR and 1H-1H COSY spectra of the complexes were used to assign the proton resonances. In the case of paramagnetic Sm3+ and Eu3+ complexes, the methine (of the fod moiety) and the bpp resonances are shifted in the opposite direction and the paramagnetic shifts are dipolar in nature, which decrease with increasing distance of the proton from the metal ion. The single-crystal X-ray analyses reveal that the complexes (Sm3+ and Eu3+) are dinuclear and crystallize in the triclinic P1 space group. Each metal in a given complex is eight coordinate by coordinating with six oxygen atoms of three fod moieties and two nitrogen atoms of the bpp. Of the two metal centers, in a given complex, one has a distorted square antiprism arrangement and the other acquires a distorted dodecahedron geometry. The Sparkle RM1 and PM7 optimized structures of the complexes are also presented and compared with the crystal structure. Theoretically observed bond distances are in excellent agreement with the experimental values, and the RMS deviations for the optimized structures are 2.878, 2.217, 2.564, and 2.675 Å. The photophysical properties of Sm3+ and Eu3+ complexes are investigated in different solvents, solid, and PMMA-doped thin hybrid films. The spectroscopic parameters (the Judd-Ofelt intensity parameters, radiative parameters, and intrinsic quantum yield) of each Eu3+ sites are calculated using the overlap polyhedra method. The theoretically obtained parameters are close to the experimental results. The lifetime of the excited state is 38.74 μs for Sm3+ and 713.62 μs for the Eu3+ complex in the solid state.
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Abbas Z, Singh P, Dasari S, Sivakumar S, Patra AK. Luminescent EuIIIand TbIIIbimetallic complexes of N,N′-heterocyclic bases and tolfenamic acid: structures, photophysical aspects and biological activity. NEW J CHEM 2020. [DOI: 10.1039/d0nj03261a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The isostructural bimetallic luminescent EuIIIand TbIIIdimers containing N,N′-heterocyclic bases and tolfenamic acid as a bridging ligands were evaluated for their structures, cellular imaging capability and photocytotoxicity.
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Affiliation(s)
- Zafar Abbas
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Prerana Singh
- Department of Chemical Engineering
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
- Department of Biological Sciences and Bioengineering
| | - Srikanth Dasari
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Sri Sivakumar
- Department of Chemical Engineering
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Ashis K. Patra
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
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de Souza KM, de Carvalho LP, da Silva JA, Longo RL. On the structures of dinuclear symmetric lanthanide complexes and the selectivity towards heterodinuclear complexes based on molecular modeling. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.05.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ilmi R, Ganaie AB, Iftikhar K. 1H NMR of paramagnetic Lanthanide(III) complexes of trifluoroacetylacetone and 2,2′-Bipyridyl and 4f-4f absorption studies. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.07.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Bao G, Wong KL, Jin D, Tanner PA. A stoichiometric terbium-europium dyad molecular thermometer: energy transfer properties. LIGHT, SCIENCE & APPLICATIONS 2018; 7:96. [PMID: 30510692 PMCID: PMC6258678 DOI: 10.1038/s41377-018-0097-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 10/02/2018] [Accepted: 10/24/2018] [Indexed: 05/02/2023]
Abstract
The optical thermometer has shown great promise for use in the fields of aeronautical engineering, environmental monitoring and medical diagnosis. Self-referencing lanthanide thermo-probes distinguish themselves because of their accuracy, calibration, photostability, and temporal dimension of signal. However, the use of conventional lanthanide-doped materials is limited by their poor reproducibility, random distance between energy transfer pairs and interference by energy migration, thereby restricting their utility. Herein, a strategy for synthesizing hetero-dinuclear complexes that comprise chemically similar lanthanides is introduced in which a pair of thermosensitive dinuclear complexes, cycTb-phEu and cycEu-phTb, were synthesized. Their structures were geometrically optimized with an internuclear distance of approximately 10.6Å. The sensitive linear temperature-dependent luminescent intensity ratios of europium and terbium emission over a wide temperature range (50-298K and 10-200K, respectively) and their temporal dimension responses indicate that both dinuclear complexes can act as excellent self-referencing thermometers. The energy transfer from Tb3+ to Eu3+ is thermally activated, with the most important pathway involving the 7F1 Eu3+ J-multiplet at room temperature. The energy transfer from the antenna to Eu3+ was simulated, and it was found that the most important ligand contributions to the rate come from transfers to the Eu3+ upper states rather than direct ligand-metal transfer to 5D1 or 5D0. As the first molecular-based thermometer with clear validation of the metal ratio and a fixed distance between the metal pairs, these dinuclear complexes can be used as new materials for temperature sensing and can provide a new platform for understanding the energy transfer between lanthanide ions.
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Affiliation(s)
- Guochen Bao
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR People’s Republic of China
- Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, NSW 2007 Australia
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007 Australia
| | - Ka-Leung Wong
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR People’s Republic of China
| | - Dayong Jin
- Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, NSW 2007 Australia
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007 Australia
| | - Peter A. Tanner
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR People’s Republic of China
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Structure elucidation by sparkle/RM1, effect of lanthanide contraction and photophysical properties of lanthanide(III) trifluoroacetylacetonate complexes with 1,10-phenanthroline. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2016.03.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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7
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Yu W, Schramm F, Pineda EM, Lan Y, Fuhr O, Chen J, Isshiki H, Wernsdorfer W, Wulfhekel W, Ruben M. Single-molecule magnet behavior in 2,2'-bipyrimidine-bridged dilanthanide complexes. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:126-37. [PMID: 26925361 PMCID: PMC4734418 DOI: 10.3762/bjnano.7.15] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 01/08/2016] [Indexed: 06/05/2023]
Abstract
A series of 2,2'-bipyrimidine-bridged dinuclear lanthanide complexes with the general formula [Ln(tmhd)3]2bpm (tmhd = 2,2,6,6-tetramethyl-3,5-heptanedionate, bpm = 2,2'-bipyrimidine, Ln = Gd(III), 1; Tb(III), 2; Dy(III), 3; Ho(III), 4 and Er(III), 5) has been synthesized and characterized. Sublimation of [Tb(tmhd)3]2bpm onto a Au(111) surface leads to the formation of a homogeneous film with hexagonal pattern, which was studied by scanning tunneling microscopy (STM). The bulk magnetic properties of all complexes have been studied comprehensively. The dynamic magnetic behavior of the Dy(III) and Er(III) compounds clearly exhibits single molecule magnet (SMM) characteristics with an energy barrier of 97 and 25 K, respectively. Moreover, micro-SQUID measurements on single crystals confirm their SMM behavior with the presence of hysteresis loops.
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Affiliation(s)
- Wen Yu
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Frank Schramm
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Eufemio Moreno Pineda
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Yanhua Lan
- Université Grenoble Alpes / CNRS, Institut NEEL, 25 rue des Martyrs, F-38000 Grenoble, France
| | - Olaf Fuhr
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Jinjie Chen
- Physikalisches Institut (PI), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany
| | - Hironari Isshiki
- Physikalisches Institut (PI), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany
| | - Wolfgang Wernsdorfer
- Université Grenoble Alpes / CNRS, Institut NEEL, 25 rue des Martyrs, F-38000 Grenoble, France
| | - Wulf Wulfhekel
- Physikalisches Institut (PI), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany
| | - Mario Ruben
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
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Dar WA, Iftikhar K. Phase controlled colour tuning of samarium and europium complexes and excellent photostability of their PVA encapsulated materials. Structural elucidation, photophysical parameters and the energy transfer mechanism in the Eu3+ complex by Sparkle/PM3 calculations. Dalton Trans 2016; 45:8956-71. [DOI: 10.1039/c6dt00549g] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Luminescence and photostability of new Sm and Eu complexes and those of their thin hybrid films have been investigated and discussed.
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Affiliation(s)
- Wakeel Ahmed Dar
- Lanthanide Research Laboratory
- Department of Chemistry
- Jamia Millia Islamia
- New Delhi 110 025
- India
| | - K. Iftikhar
- Lanthanide Research Laboratory
- Department of Chemistry
- Jamia Millia Islamia
- New Delhi 110 025
- India
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Martín-Ramos P, Pereira LCJ, Coutinho JT, Koprowiak F, Bolvin H, Lavín V, Martín IR, Martín-Gil J, Silva MR. Structure, luminescence and magnetic properties of an erbium(iii) β-diketonate homodinuclear complex. NEW J CHEM 2016. [DOI: 10.1039/c6nj01598k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photoluminescence properties and field-induced single-molecule-magnetic behavior of a novel erbium(iii) β-diketonate homodinuclear complex, [Er2(nd)6(μ-bpm)] (nd = 2,4-nonanedione and bpm = 2,2′-bipyrimidine), are presented.
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Affiliation(s)
- P. Martín-Ramos
- EPSH
- Universidad de Zaragoza
- Carretera de Cuarte s/n
- Huesca
- Spain
| | - L. C. J. Pereira
- C2TN
- DECN
- Instituto Superior Técnico
- Universidade de Lisboa
- 2695-066 Bobadela LRS
| | - J. T. Coutinho
- C2TN
- DECN
- Instituto Superior Técnico
- Universidade de Lisboa
- 2695-066 Bobadela LRS
| | - F. Koprowiak
- Laboratoire de Chimie et Physique Quantiques
- Université Toulouse III
- 31062 Toulouse
- France
| | - H. Bolvin
- Laboratoire de Chimie et Physique Quantiques
- Université Toulouse III
- 31062 Toulouse
- France
| | - V. Lavín
- Departamento de Física and MALTA Consolider Team
- Universidad de La Laguna
- E-38206 San Cristóbal de La Laguna
- Santa Cruz de Tenerife
- Spain
| | - I. R. Martín
- Departamento de Física and MALTA Consolider Team
- Universidad de La Laguna
- E-38206 San Cristóbal de La Laguna
- Santa Cruz de Tenerife
- Spain
| | - J. Martín-Gil
- Advanced Materials Laboratory
- ETSIIAA
- Universidad de Valladolid
- Palencia
- Spain
| | - M. Ramos Silva
- CFisUC
- Department of Physics
- Universidade de Coimbra
- Rua Larga
- P-3004-516 Coimbra
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Optical emission studies of new europium and terbium dinuclear complexes with trifluoroacetylacetone and bridging bipyrimidine. Fast radiation and high emission quantum yield. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.07.046] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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11
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Martín-Ramos P, Ramos Silva M, Lahoz F, Martín I, Chamorro-Posada P, Eusebio M, Lavín V, Martín-Gil J. Highly fluorinated erbium(III) complexes for emission in the C-band. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.07.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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