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Salerno EV, Eliseeva SV, Petoud S, Pecoraro VL. Tuning white light emission using single-component tetrachroic Dy 3+ metallacrowns: the role of chromophoric building blocks. Chem Sci 2024; 15:8019-8030. [PMID: 38817571 PMCID: PMC11134414 DOI: 10.1039/d4sc00389f] [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: 01/17/2024] [Accepted: 04/19/2024] [Indexed: 06/01/2024] Open
Abstract
White light production is of major importance for ambient lighting and technological displays. White light can be obtained by several types of materials and their combinations, but single component emitters remain rare and desirable towards thinner devices that are, therefore, easier to control and that require fewer manufacturing steps. We have designed a series of dysprosium(iii)-based luminescent metallacrowns (MCs) to achieve this goal. The synthesized MCs possess three main structural types LnGa4(L')4(L'')4 (type A), Ln2Ga8(L')8(L''')4 (type B) and LnGa8(L')8(OH)4 (type C) (H3L', HL'' and H2L''' derivatives of salicylhydroxamic, benzoic and isophthalic acids, respectively). The advantage of these MCs is that, within each structural type, the nature of the organic building blocks does not affect the symmetry around Dy3+. By detailed studies of the photophysical properties of these Dy3+-based MCs, we have demonstrated that CIE coordinates can be tuned from warm to neutral to cold white by (i) defining the symmetry about Dy3+, and (ii) choosing appropriate chromophoric building blocks. These organic building blocks, without altering the coordination geometry around Dy3+, influence the total emission profile through changing the probability of different energy transfer processes including the 3T1 ← Dy3+* energy back transfer and/or by generating ligand-centered fluorescence in the blue range. This work opens new perspectives for the creation of white light emitting devices using single component tetrachroic molecular compounds.
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Affiliation(s)
- Elvin V Salerno
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan Ann Arbor Michigan 48109 USA
| | - Svetlana V Eliseeva
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans F-45071 Orléans Cedex 2 France
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans F-45071 Orléans Cedex 2 France
| | - Vincent L Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan Ann Arbor Michigan 48109 USA
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2
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Shen Y, Qu TB, Zhang XY, Chen FY, Liu BQ, Zhang JW. Six nickel-lanthanoid heterometallic complexes based on 2,5-dichlorobenzoate and phen: Syntheses, structures and magnetic properties. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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3
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Salerno EV, Carneiro Neto AN, Eliseeva SV, Hernández-Rodríguez MA, Lutter JC, Lathion T, Kampf JW, Petoud S, Carlos LD, Pecoraro VL. Tunable Optical Molecular Thermometers Based on Metallacrowns. J Am Chem Soc 2022; 144:18259-18271. [PMID: 36173924 DOI: 10.1021/jacs.2c04821] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The effect of ligands' energy levels on thermal dependence of lanthanide emission was examined to create new molecular nanothermometers. A series of Ln2Ga8L8'L8″ metallacrowns (shorthand Ln2L8'), where Ln = Gd3+, Tb3+, or Sm3+ (H3L' = salicylhydroxamic acid (H3shi), 5-methylsalicylhydroxamic acid (H3mshi), 5-methoxysalicylhydroxamic acid (H3moshi), and 3-hydroxy-2-naphthohydroxamic acid (H3nha)) and H2L″ = isophthalic acid (H2iph), was synthesized and characterized. Within the series, ligand-centered singlet state (S1) energy levels ranged from 23,300 to 27,800 cm-1, while triplet (T1) energy levels ranged from 18,150 to 21,980 cm-1. We demonstrated that the difference between T1 levels and relevant energies of the excited 4G5/2 level of Sm3+ (17,800 cm-1) and 5D4 level of Tb3+ (20,400 cm-1) is the major parameter controlling thermal dependence of the emission intensity via the back energy transfer mechanism. However, when the energy difference between S1 and T1 levels is small (below 3760 cm-1), the S1 → T1 intersystem crossing (and its reverse, S1 ← T1) mechanism contributes to the thermal behavior of metallacrowns. Both mechanisms affect Ln3+-centered room-temperature quantum yields with values ranging from 2.07(6)% to 31.2(2)% for Tb2L8' and from 0.0267(7)% to 2.27(5)% for Sm2L8'. The maximal thermal dependence varies over a wide thermal range (ca. 150-350 K) based on energy gaps between relevant ligand-based and lanthanide-based electronic states. By mixing Tb2moshi8' with Sm2moshi8' in a 1:1 ratio, an optical thermometer with a relative thermal sensitivity larger than 3%/K at 225 K was created. Other temperature ranges are also accessible with this approach.
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Affiliation(s)
- Elvin V Salerno
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Albano N Carneiro Neto
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro Campus de Santiago, Aveiro 3810-193, Portugal
| | - Svetlana V Eliseeva
- Centre de Biophysique Moléculaire CNRS UPR 4301, 45071 Orléans Cedex 2, France
| | - Miguel A Hernández-Rodríguez
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro Campus de Santiago, Aveiro 3810-193, Portugal
| | - Jacob C Lutter
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Timothée Lathion
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jeff W Kampf
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire CNRS UPR 4301, 45071 Orléans Cedex 2, France
| | - Luis D Carlos
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro Campus de Santiago, Aveiro 3810-193, Portugal
| | - Vincent L Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
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4
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Luminescent Metal Complexes for Bioassays in the Near-Infrared (NIR) Region. Top Curr Chem (Cham) 2022; 380:31. [PMID: 35715540 DOI: 10.1007/s41061-022-00386-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 05/14/2022] [Indexed: 10/18/2022]
Abstract
Near-infrared (NIR, 700-1700 nm) luminescent imaging is an emerging bioimaging technology with low photon scattering, minimal autofluorescence, deep tissue penetration, and high spatiotemporal resolution that has shown fascinating promise for NIR imaging-guided theranostics. In recent progress, NIR luminescent metal complexes have attracted substantially increased research attention owing to their intrinsic merits, including small size, anti-photobleaching, long lifetime, and metal-centered NIR emission. In the past decade, scientists have contributed to the advancement of NIR metal complexes involving efforts to improve photophysical properties, biocompatibility, specificity, pharmacokinetics, in vivo visualization, and attempts to exploit new ligand platforms. Herein, we summarize recent progress and provide future perspectives for NIR metal complexes, including d-block transition metals and f-block lanthanides (Ln) as NIR optical molecular probes for bioassays.
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5
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Eliseeva SV, Travis JR, Nagy SG, Smihosky AM, Foley CM, Kauffman AC, Zaleski CM, Petoud S. Visible and near-infrared emitting heterotrimetallic lanthanide-aluminum-sodium 12-metallacrown-4 compounds: discrete monomers and dimers. Dalton Trans 2022; 51:5989-5996. [PMID: 35352078 DOI: 10.1039/d1dt04277g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The luminescence properties of two types of heterotrimetallic aluminum-lanthanide-sodium 12-metallacrown-4 compounds are presented here, LnNa(ben)4[12-MCAl(III)N(shi)-4] (LnAl4Na) and {LnNa[12-MCAl(III)N(shi)-4]}2(iph)4 (Ln2Al8Na2), where Ln = GdIII, TbIII, ErIII, and YbIII, MC is metallacrown, ben- is benzoate, shi3- is salicylhydroximate, and iph2- is isophthalate. The aluminum-lanthanide-sodium metallacrowns formed with benzoate are discrete monomers while, upon replacement of the benzoate with the dicarboxylate isophthalate, two individual metallacrowns can be joined to form a dimer. In the solid state, the terbium version of each structure type displays emission in the visible region, and the erbium and ytterbium complexes emit in the near-infrared. The luminescence lifetimes (τobs) and quantum yields have been collected under ligand excitation (QLLn) for both LnAl4Na monomers and Ln2Al8Na2 dimers. Several of these values tend to be shorter (luminescence lifetimes) and smaller (quantum yields) than the corresponding values recorded for the structurally similar gallium-lanthanide monomer and dimer 12-MC-4 molecules. However, the quantum yield value recorded for the visible emitting Tb2Al8Na2 dimer, 43.9%, is the highest value observed in the solid state to date for a TbIII based metallacrown.
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Affiliation(s)
- Svetlana V Eliseeva
- Centre de Biophysique Moléculaire, CNRS UPR 4301, 45071 Orléans Cedex 2, France.
| | - Jordan R Travis
- Department of Chemistry and Biochemistry, Shippensburg University, 1871 Old Main Dr., Shippensburg, PA 17257, USA.
| | - Sarah G Nagy
- Department of Chemistry and Biochemistry, Shippensburg University, 1871 Old Main Dr., Shippensburg, PA 17257, USA.
| | - Alyssa M Smihosky
- Department of Chemistry and Biochemistry, Shippensburg University, 1871 Old Main Dr., Shippensburg, PA 17257, USA.
| | - Collin M Foley
- Department of Chemistry and Biochemistry, Shippensburg University, 1871 Old Main Dr., Shippensburg, PA 17257, USA.
| | - Abigail C Kauffman
- Department of Chemistry and Biochemistry, Shippensburg University, 1871 Old Main Dr., Shippensburg, PA 17257, USA.
| | - Curtis M Zaleski
- Department of Chemistry and Biochemistry, Shippensburg University, 1871 Old Main Dr., Shippensburg, PA 17257, USA.
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, CNRS UPR 4301, 45071 Orléans Cedex 2, France.
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Yao H, Calvez G, Daiguebonne C, Suffren Y, Bernot K, Roisnel T, Guillou O. Synthesis, Crystal Structure, and Luminescence Properties of the Iso-Reticular Series of Lanthanide Coordination Polymers Synthesized from Hexa-Lanthanide Molecular Precursors. Inorg Chem 2022; 61:4895-4908. [PMID: 35289618 DOI: 10.1021/acs.inorgchem.1c03654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Microwave-assisted reactions in DMSO, between a hexa-lanthanide octahedral complex ([Ln6(μ6-O)(μ3-OH)8(NO3)6(H2O)12·2NO3·2H2O] with Ln = Nd-Yb plus Y) and either 3-halogenobenzoic acid (hereafter symbolized by 3-xbH with x = f or c for fluoro or chloro, respectively) or 4-halogenobenzoic acid (hereafter symbolized by 4-xbH with x = f, c, or b for fluoro, chloro, or bromo, respectively), lead to 1D lanthanide coordination polymers. These coordination polymers are almost iso-reticular. The crystal structure is described on the basis of the coordination polymer with chemical formula [Tb(4-fb)3(DMSO)(H2O)2·DMSO]∞ obtained from 4-fluorobenzoic acid (4-fbH) and the Tb3+-based octahedral complex: It crystallizes in the triclinic system, space group P1̅ (n°2), with the following cell parameters: a = 9.8561(9) Å, b = 10.5636(9) Å, c = 15.1288(15) Å, α = 100.840(3)°, β = 95.552(3)°, γ = 110.482(3)°, V = 1426.4(3) Å3, and Z = 2. It can be described on the basis of 1D molecular chains. Luminescence properties of the Tb and Eu derivatives have been measured and compared vs the halogeno-function and its position (meta or para). Some molecular alloys have also been prepared to estimate the strength of the intermetallic energy transfers. To confirm that the hexa-nuclear complexes (and not the halogenated ligand) have a structuring effect for the formation of the straight chain-like molecular motif, another coordination polymer with chemical formula [Tb(4-npa)3DMSO·DMSO·H2O]∞ where 4-npaH symbolizes 4-nitro-phenyl-acetic acid has been prepared. It crystallizes in the triclinic system, space group P1̅ (n°2) with the following cell parameters: a = 7.8784(8) Å, b = 14.8719(16) Å, c = 15.2753(17) Å, α = 73.612(4)°, β = 86.406(4)°, γ = 83.104(4)°, V = 1703.8(3) Å3, and Z = 2. Its crystal structure can be described on the basis of a molecular motif that is similar to the one observed in the five previous crystal structures which confirms the structuring effect of the hexa-nuclear complexes.
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Affiliation(s)
- Haiyun Yao
- Univ Rennes, INSA Rennes, CNRS UMR 6226 "Institut des Sciences Chimiques de Rennes", 35708 Rennes, France
| | - Guillaume Calvez
- Univ Rennes, INSA Rennes, CNRS UMR 6226 "Institut des Sciences Chimiques de Rennes", 35708 Rennes, France
| | - Carole Daiguebonne
- Univ Rennes, INSA Rennes, CNRS UMR 6226 "Institut des Sciences Chimiques de Rennes", 35708 Rennes, France
| | - Yan Suffren
- Univ Rennes, INSA Rennes, CNRS UMR 6226 "Institut des Sciences Chimiques de Rennes", 35708 Rennes, France
| | - Kevin Bernot
- Univ Rennes, INSA Rennes, CNRS UMR 6226 "Institut des Sciences Chimiques de Rennes", 35708 Rennes, France.,Institut Universitaire de France, 1 rue Descartes, 75005 Paris, France
| | - Thierry Roisnel
- Univ Rennes, INSA Rennes, CNRS UMR 6226 "Institut des Sciences Chimiques de Rennes", 35708 Rennes, France
| | - Olivier Guillou
- Univ Rennes, INSA Rennes, CNRS UMR 6226 "Institut des Sciences Chimiques de Rennes", 35708 Rennes, France
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7
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Willauer AR, Douair I, Chauvin AS, Fadaei-Tirani F, Bünzli JCG, Maron L, Mazzanti M. Structure, reactivity and luminescence studies of triphenylsiloxide complexes of tetravalent lanthanides. Chem Sci 2022; 13:681-691. [PMID: 35173932 PMCID: PMC8769062 DOI: 10.1039/d1sc05517h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 12/15/2021] [Indexed: 12/03/2022] Open
Abstract
Among the 14 lanthanide elements (Ce–Lu), until recently, the tetravalent oxidation state was readily accessible in solution only for cerium while Pr(iv), Nd(iv), Dy(iv) and Tb(iv) had only been detected in the solid state. The triphenylsiloxide ligand recently allowed the isolation of molecular complexes of Tb(iv) and Pr(iv) providing an unique opportunity of investigating the luminescent properties of Ln(iv) ions. Here we have expanded the coordination studies of the triphenylsiloxide ligand with Ln(iii) and Ln(iv) ions and we report the first observed luminescence emission spectra of Pr(iv) complexes which are assigned to a ligand-based emission on the basis of the measured lifetime and computational studies. Binding of the ligand to the Pr(iv) ion leads to an unprecedented large shift of the ligand triplet state which is relevant for future applications in materials science. The first observed luminescence emission spectra of Pr(iv) complexes are assigned to a ligand-based emission. Binding of the triphenylsiloxide ligand to the Pr(iv) ion leads to an unprecedented large red shift of its triplet state.![]()
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Affiliation(s)
- Aurélien R Willauer
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Iskander Douair
- Laboratoire de Physique et Chimie des Nano-objets, Institut National des Sciences Appliquées 31077 Toulouse France
| | - Anne-Sophie Chauvin
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Farzaneh Fadaei-Tirani
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Jean-Claude G Bünzli
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland .,Department of Biomedical Engineering, Southern University of Science and Technology (SUSTech) Shenzhen China
| | - Laurent Maron
- Laboratoire de Physique et Chimie des Nano-objets, Institut National des Sciences Appliquées 31077 Toulouse France
| | - Marinella Mazzanti
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
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Korshunov VM, Metlin MT, Ambrozevich SA, Golovanov IS, Gontcharenko VE, Selyukov AS, Taydakov IV. Impact of ligand-centered excited states on luminescence sensitization in Pr 3+ complexes with β-diketones. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 260:119863. [PMID: 34030034 DOI: 10.1016/j.saa.2021.119863] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 03/17/2021] [Accepted: 04/18/2021] [Indexed: 06/12/2023]
Abstract
In this study, two novel Pr3+ complexes with different 1,3-diketonate ligands were synthesized and investigated. To study the effect of the ancillary ligand on the energy transfer mechanisms in the complexes, a phenanthroline ligand was introduced. To take into account the influence of the ligand environment composed of different ligands on the energy transfer and relaxation processes, we compared the synthesized compounds with a similar complex containing the phenanthroline ligand. The spectroscopic studies in the visible and near-infrared spectral regions were supplemented with DFT and TD-DFT calculations. We found two ligand-to-ligand charge transfer (LLCT) states, with one state corresponding to energy transfer between 1,3-diketones and the other - to energy transfer from the 1,3-diketone to the phenanthroline motif. It was demonstrated that optical excitation via the latter channel leads to a fourfold increase in the luminescence quantum yield as compared with excitation via the π-π∗ transitions in 1,3-diketones. Moreover, both LLCT states provide sensitization of the Pr3+ luminescence involving the 3P0 and 3P1 levels.
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Affiliation(s)
- V M Korshunov
- P.N.Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninsky Prospect, 119991 Moscow, Russia; Bauman Moscow State Technical University, 5/1 2-ya Baumanskaya Str., 105005 Moscow, Russia.
| | - M T Metlin
- P.N.Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninsky Prospect, 119991 Moscow, Russia; Bauman Moscow State Technical University, 5/1 2-ya Baumanskaya Str., 105005 Moscow, Russia
| | - S A Ambrozevich
- P.N.Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninsky Prospect, 119991 Moscow, Russia
| | - I S Golovanov
- N.D.Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991 Moscow, Russia
| | | | - A S Selyukov
- P.N.Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninsky Prospect, 119991 Moscow, Russia
| | - I V Taydakov
- P.N.Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninsky Prospect, 119991 Moscow, Russia; Plekhanov Russian University of Economics, Stremyanny lane, 36, 117997 Moscow, Russia.
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Paiva FF, Ferreira LA, Rosa IM, da Silva RM, Sigoli F, Cambraia Alves O, Garcia F, Guedes GP, Marinho MV. Heterobimetallic metallacrown of EuIIICuII5 with 5-methyl-2-pyrazinehydroxamic acid: Synthesis, crystal structure, magnetism, and the influence of CuII ions on the photoluminescent properties. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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10
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Passadis SS, Hadjithoma S, Siafarika P, Kalampounias AG, Keramidas AD, Miras HN, Kabanos TA. Synthesis, Structural and Physicochemical Characterization of a Titanium(IV) Compound with the Hydroxamate Ligand N,2-Dihydroxybenzamide. Molecules 2021; 26:5588. [PMID: 34577059 PMCID: PMC8465426 DOI: 10.3390/molecules26185588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 11/17/2022] Open
Abstract
The siderophore organic ligand N,2-dihydroxybenzamide (H2dihybe) incorporates the hydroxamate group, in addition to the phenoxy group in the ortho-position and reveals a very rich coordination chemistry with potential applications in medicine, materials, and physical sciences. The reaction of H2dihybe with TiCl4 in methyl alcohol and KOH yielded the tetranuclear titanium oxo-cluster (TOC) [TiIV4(μ-O)2(HOCH3)4(μ-Hdihybe)4(Hdihybe)4]Cl4∙10H2O∙12CH3OH (1). The titanium compound was characterized by single-crystal X-ray structure analysis, ESI-MS, 13C, and 1H NMR spectroscopy, solid-state and solution UV-Vis, IR vibrational, and luminescence spectroscopies and molecular orbital calculations. The inorganic core Ti4(μ-O)2 of 1 constitutes a rare structural motif for discrete TiIV4 oxo-clusters. High-resolution ESI-MS studies of 1 in methyl alcohol revealed the presence of isotopic distribution patterns which can be attributed to the tetranuclear clusters containing the inorganic core {Ti4(μ-O)2}. Solid-state IR spectroscopy of 1 showed the presence of an intense band at ~800 cm-1 which is absent in the spectrum of the H2dihybe and was attributed to the high-energy ν(Ti2-μ-O) stretching mode. The ν(C=O) in 1 is red-shifted by ~10 cm-1, while the ν(N-O) is blue-shifted by ~20 cm-1 in comparison to H2dihybe. Density Functional Theory (DFT) calculations reveal that in the experimental and theoretically predicted IR absorbance spectra of the ligand and Ti-complex, the main bands observed in the experimental spectra are also present in the calculated spectra supporting the proposed structural model. 1H and 13C NMR solution (CD3OD) studies of 1 reveal that it retains its integrity in CD3OD. The observed NMR changes upon addition of base to a CD3OD solution of 1, are due to an acid-base equilibrium and not a change in the TiIV coordination environment while the decrease in the complex's lability is due to the improved electron-donating properties which arise from the ligand deprotonation. Luminescence spectroscopic studies of 1 in solution reveal a dual narrow luminescence at different excitation wavelengths. The TOC 1 exhibits a band-gap of 1.98 eV which renders it a promising candidate for photocatalytic investigations.
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Affiliation(s)
- Stamatis S. Passadis
- Section of Inorganic and Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece;
| | - Sofia Hadjithoma
- Department of Chemistry, University of Cyprus, Nicosia 2109, Cyprus;
| | - Panagiota Siafarika
- Physical Chemistry Laboratory, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece;
| | - Angelos G. Kalampounias
- Physical Chemistry Laboratory, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece;
- Institute of Materials Science and Computing, University Research Center of Ioannina (URCI), 45110 Ioannina, Greece
| | | | | | - Themistoklis A. Kabanos
- Section of Inorganic and Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece;
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11
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Ma H, Zhou Y, Gao T, Li H, Yan P. The role of ancillary ligand on regulating photoluminescence properties of Eu(III) helicates. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120495] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Salerno EV, Kampf JW, Pecoraro VL, Mallah T. Magnetic properties of two Gd IIIFe III4 metallacrowns and strategies for optimizing the magnetocaloric effect of this topology. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00207d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Two Gd3+ [12-MCFeIII(N)shi-4] metallacrowns are analyzed for magnetic properties, and calculations concerning the magnetic exchange parameters of this topology are considered.
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Affiliation(s)
- Elvin V. Salerno
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | - Jeff W. Kampf
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | - Vincent L. Pecoraro
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- CNRS
- Université Paris-Saclay
- 91405 Orsay Cedex
- France
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