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Delano F, Deshapriya S, Demir S. Guanidinate Yttrium Complexes Containing Bipyridyl and Bis(benzimidazolyl) Radicals. Inorg Chem 2024; 63:9659-9669. [PMID: 38569134 PMCID: PMC11134503 DOI: 10.1021/acs.inorgchem.4c00006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Revised: 02/26/2024] [Accepted: 03/06/2024] [Indexed: 04/05/2024]
Abstract
Ancillary ligand scaffolds that sufficiently stabilize a metal ion to allow its coordination to an open-shell ligand are scarce, yet their development is essential for next-generation spin-based materials with topical applications in quantum information science. To this end, a synthetic challenge must be met: devising molecules that enable the binding of a redox-active ligand through facile displacement and clean removal of a weakly coordinating anion. Here, we probe the accessibility of unprecedented radical-containing rare-earth guanidinate complexes by combining our recently discovered yttrium tetraphenylborate complex [{(Me3Si)2NC(NiPr)2}2Y][(μ-η6-Ph)(BPh3)] with the redox-active ligands 2,2'-bipyridine (bpy) and 2,2'-bis(benzimidazole) (Bbim), respectively, under reductive conditions. Our endeavor resulted in the first evidence of guanidinate complexes that contain radicals, namely, a mononuclear bipyridyl radical complex, {(Me3Si)2NC(NiPr)2}2Y(bpy•) (1), and a dinuclear bis(benzimidazolyl) radical-bridged complex, [K(crypt-222)][{(Me3Si)2NC(NiPr)2}2Y]2(μ-Bbim•) (2'). The latter was achieved by an in situ reduction of [{(Me3Si)2NC(NiPr)2}2Y]2(μ-Bbim) (2), which was isolated from a salt metathesis reaction. 1 and 2 were characterized by X-ray crystallography and IR and UV-vis spectroscopy. Variable-temperature electron paramagnetic resonance spectroscopy was applied to gain insight into the distribution of unpaired spin density on 1 and 2'. Density functional theory calculations were conducted on 1 and 2' to elucidate further their electronic structures. The redox activity of 1 and 2' was also probed by electrochemical methods.
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Affiliation(s)
| | | | - Selvan Demir
- Department of Chemistry, Michigan
State University (MSU), 578 South Shaw Lane, East Lansing, Michigan 48824, United States
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2
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Ganaie AB, Iftikhar K. Structure, optical absorption and NIR-Photoluminescence of ternary Neodymium (III) complexes with fluorinated β-diketone and heterocyclic Lewis bases. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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4
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Facile Solvent-Free Mechanochemical Synthesis of UI3 and Lanthanoid Iodides. CHEMISTRY 2022. [DOI: 10.3390/chemistry4040108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Lewis base-free lanthanoid (Ln) and actinoid (An) iodides are difficult to obtain, as standard protocols describe syntheses in solutions of donor solvents which are ultimately hard to remove. We have now established a mechanochemical approach towards the synthesis of Lewis base-free f-block metal iodides with excellent yields. In particular, we describe herein the synthesis of EuI2 as an example of a divalent lanthanoid iodide, of CeI3 as an example of a trivalent lanthanoid iodide, and of UI3 as the most important actinoid iodide. Each can be obtained in high yield with minimal work-up, presenting the most efficient and simple synthetic route to access these materials to date.
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6
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Chappidi DY, Gordon MN, Ashberry HM, Huang J, Labedis BM, Cooper RE, Cooper BJ, Carta V, Skrabalak SE, Dunbar KR, Fatila EM. Mechanochemical Syntheses of Ln(hfac) 3(H 2O) x (Ln = La-Sm, Tb): Isolation of 10-, 9-, and 8-Coordinate Ln(hfac) n Complexes. Inorg Chem 2022; 61:12197-12206. [PMID: 35892174 PMCID: PMC9374134 DOI: 10.1021/acs.inorgchem.2c01274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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Volatile lanthanide coordination complexes are critical
to the
generation of new optical and magnetic materials. One of the most
common precursors for preparing volatile lanthanide complexes is the
hydrate with the general formula Ln(hfac)3(H2O)x (x = 3 for La-Nd, x = 2 for Sm) (hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato).
We have investigated the synthesis of Ln(hfac)3(H2O)x using more environmentally sustainable
mechanochemical approaches. Characterization of the products using
Fourier transform infrared spectroscopy, nuclear magnetic resonance
spectroscopy, elemental analysis, and powder X-ray diffraction shows
substantial differences in product distribution between methods. The
mechanochemical synthesis of the hydrate complexes leads to a variety
of coordination compounds including the expected hydrate product,
the known retro-Claisen impurity, and hydrated protonated Hhfac ligand
depending on the technique employed. Surprisingly, 10-coordinate complexes
of the form Na2Ln(hfac)5·3H2O for Ln = La-Nd were also isolated from reactions using a mortar
and pestle. The electrostatic bonding of lanthanide coordination complexes
is a challenge for obtaining reproducible reactions and clean products.
The reproducibility issues are most acute for the large, early lanthanides
whereas for the mid to late lanthanides, reproducibility in terms
of product distribution and yield is less of an issue because of their
smaller size and greater charge to radius ratio. Ball milling increases
reproducibility in terms of generating the desired Ln(hfac)3(H2O)x along with hydrated
Hhfac (tetraol) and free Hhfac products. The results illustrate the
dynamic behavior of lanthanide complexes in solution and the solid
state as well as the structural diversity available to the early lanthanides. Mechanochemical reactions to prepare
Ln(hfac)3(H2O)x (Ln
= La-Sm, Tb) complexes
are used to illustrate the highly variable coordination chemistry
of the early lanthanides compared to the mid-lanthanides. Using either
a mortar and pestle or ball mill results in unexpected products and
different product distributions. An open mortar and pestle can yield
10-coordinate pentakis-hfac complexes of La, Ce, Pr, and Nd, whereas
ball milling consistently results in Ln(hfac)3(H2O)x complexes with volatile Hhfac and
hydrated Hhfac·2H2O (tetraol) that can be removed
by vacuum.
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Affiliation(s)
- Deepthi Y Chappidi
- Department of Chemistry and Physics, Louisiana Tech University, 1 Adams Blvd., Ruston, Louisiana 71272, United States
| | - Matthew N Gordon
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, Indiana 47405, United States
| | - Hannah M Ashberry
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, Indiana 47405, United States
| | - Junjie Huang
- Department of Chemistry, Texas A & M University, College Station, Texas 77842, United States
| | - Bruce M Labedis
- Department of Chemistry and Physics, Louisiana Tech University, 1 Adams Blvd., Ruston, Louisiana 71272, United States
| | - Riley E Cooper
- Department of Chemistry and Physics, Louisiana Tech University, 1 Adams Blvd., Ruston, Louisiana 71272, United States
| | - Brandon J Cooper
- Department of Chemistry and Physics, Louisiana Tech University, 1 Adams Blvd., Ruston, Louisiana 71272, United States
| | - Veronica Carta
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, Indiana 47405, United States
| | - Sara E Skrabalak
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, Indiana 47405, United States
| | - Kim R Dunbar
- Department of Chemistry, Texas A & M University, College Station, Texas 77842, United States
| | - Elisabeth M Fatila
- Department of Chemistry and Physics, Louisiana Tech University, 1 Adams Blvd., Ruston, Louisiana 71272, United States
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7
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Pells JA, Guan D, Leznoff DB. Heterobimetallic Ln(III)‐Containing Materials Based on One‐Dimensional Aurophilic Chains of Gold(I) Dithiolate Dimers and Their Vapochromic Response to DMF. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jefferson A. Pells
- Department of Chemistry Simon Fraser University 8888 University Dr., Burnaby British Columbia V5A 1S6 Canada
| | - David Guan
- Department of Chemistry Simon Fraser University 8888 University Dr., Burnaby British Columbia V5A 1S6 Canada
| | - Daniel B. Leznoff
- Department of Chemistry Simon Fraser University 8888 University Dr., Burnaby British Columbia V5A 1S6 Canada
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8
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Bashir Ganaie A, Iftikhar K. Stoichiometrically controlled synthesis and comparative study of photoluminescence of seven and eight coordinate complexes of Sm3+, Eu3+ and Tb3+ based on 6,6,7,7,8,8,8- heptafluoro-2,2-dimethyl-3,5-octanedione (Hfod) and imidazole. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2021.113715] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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9
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Structural Characterization, Magnetic and Luminescent Properties of Praseodymium(III)-4,4,4-Trifluoro-1-(2-Naphthyl)Butane-1,3-Dionato(1-) Complexes. CRYSTALS 2021. [DOI: 10.3390/cryst11020179] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Four new Pr(III) mononuclear complexes of formula [Pr(ntfa)3(MeOH)2] (1), [Pr(ntfa)3(bipy)2] (2), [Pr(ntfa)3(4,4′-Mt2bipy)] (3) and [Pr(ntfa)3(5,5′-Me2bipy)] (4), where ntfa = 4,4,4-trifuoro-1-(naphthalen-2-yl)butane-1,3-dionato(1-), 5,5′-Me2bipy = 5,5′-dimethyl-2,2′-dipyridine, 4,4′-Mt2bipy = 4,4′-dimethoxy-2,2′-dipyridine, have been synthesized and structurally characterized. The complexes display the coordination numbers 8 for 1, 3 and 4, and 10 for 2. Magnetic measurements of complexes 1–4 were consistent with a magnetically uncoupled Pr3+ ion in the 3H4 ground state. The solid state luminescence studies showed that the ancillary chelating bipyridyl ligands in the 2–4 complexes greatly enhance the luminescence emission in the visible and NIR regions through efficient energy transfer from the ligands to the central Pr3+ ion; behaving as “antenna” ligands.
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Vicente R, Tubau À, Speed S, Mautner FA, Bierbaumer F, Fischer RC, Massoud SS. Slow magnetic relaxation and luminescence properties in neodymium( iii)-4,4,4-trifluoro-1-(2-naphthyl)butane-1,3-dionato complexes incorporating bipyridyl ligands. NEW J CHEM 2021. [DOI: 10.1039/d1nj02583j] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A new series of eight-coordinated Nd(iii) complexes derived from 4,4,4-trifluoro-1-(naphthalen-2-yl)butane-1,3-dionate and bi-pyridyl ligands revealed multifunctional molecular materials as photoluminescent single-molecule magnets (SMMs).
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Affiliation(s)
- Ramon Vicente
- Departament de Química Inorgànica i Orgànica
- Universitat de Barcelona
- E-31321 Barcelona
- Spain
| | - Ànnia Tubau
- Departament de Química Inorgànica i Orgànica
- Universitat de Barcelona
- E-31321 Barcelona
- Spain
| | - Saskia Speed
- Departament de Química Inorgànica i Orgànica
- Universitat de Barcelona
- E-31321 Barcelona
- Spain
| | - Franz A. Mautner
- Institut für Physikalische and Theoretische Chemie
- Technische Universität Graz
- A-8010 Graz
- Austria
| | - Florian Bierbaumer
- Institut für Physikalische and Theoretische Chemie
- Technische Universität Graz
- A-8010 Graz
- Austria
| | - Roland C. Fischer
- Institut für Anorganische Chemie
- Technische Universität Graz
- A-8010 Graz
- Austria
| | - Salah S. Massoud
- Department of Chemistry
- University of Louisiana at Lafayette
- Lafayette
- USA
- Department of Chemistry
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11
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Li H, Famulari A, Xin L, Zhou H, Zhang P, Guo F. Stoichiometry mechanosynthesis and interconversion of metal salts containing [CuCl 3(H 2O)] − and [Cu 2Cl 8] 4−. CrystEngComm 2019. [DOI: 10.1039/c9ce00911f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The mechanochemical interconversion of two salts was achieved by the addition of an appropriate amount of one of the corresponding components (HL or CuCl2·2H2O), and the progress of dynamic interconversion was revealed by PXRD, fluorescence and Raman spectroscopy.
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Affiliation(s)
- Haitao Li
- College of Chemistry
- Liaoning University
- Shenyang
- China
| | - Antonino Famulari
- Dipartimento di Chimica Materiali e Ingegneria Chimca. “Giulio Natta”
- Politecnico di Milano
- 20131 Milan
- Italy
| | - Lianxin Xin
- College of Chemistry
- Liaoning University
- Shenyang
- China
| | - Hongjian Zhou
- College of Chemistry
- Liaoning University
- Shenyang
- China
| | - Peng Zhang
- College of Chemistry
- Liaoning University
- Shenyang
- China
| | - Fang Guo
- College of Chemistry
- Liaoning University
- Shenyang
- China
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