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Krämer K, Schmitz M, Kelm H, van Wüllen C, Krüger HJ. Unexpected Reduction of a Coordinated Diazapyridinophane Ligand Bound to Chromium(III) Ion Leading to Delocalization of the Unpaired Electron across Two Isolated Pyridine Units. Chemistry 2024; 30:e202301099. [PMID: 37903737 DOI: 10.1002/chem.202301099] [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: 04/06/2023] [Revised: 10/06/2023] [Accepted: 10/27/2023] [Indexed: 11/01/2023]
Abstract
In the tetraazamacrocyclic ligand N,N'-dimethyl-2,11-diaza-[3.3](2,6)pyridinophane (L-N4 Me2 ), the two pyridine units are separated from each other by sp3 -hybridized triatomic bridges. Such electronically isolated pyridine moieties are considerably less prone to reductions than di- or triimines. A detailed structural, magnetic, and spectroscopic investigation of the complexes [Cr(L-N4 Me2 )(OAc)2 ] and [Cr(L-N4 Me2 )(OAc)2 ](PF6 ), in combination with theoretical calculations, reveals that the reduced complex must be described as a chromium(III) ion coordinated to the anionic radical ligand (L-N4 Me2 )⋅- rather than a low-spin chromium(II) ion bound to closed-shell ligands. Thus, it is, to the best of our knowledge, only the second example of a stable and structurally characterized metal complex containing a reduced isolated pyridine unit. The stability is attributed to the delocalization of the unpaired electron across the two pyridine units, mediated by their interaction to the metal ion.
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Affiliation(s)
- Kristin Krämer
- RPTU Kaiserslautern-Landau, Department of Chemistry, Erwin-Schrödinger Straße 54, 67663, Kaiserslautern, Germany
| | - Markus Schmitz
- RPTU Kaiserslautern-Landau, Department of Chemistry, Erwin-Schrödinger Straße 54, 67663, Kaiserslautern, Germany
| | - Harald Kelm
- RPTU Kaiserslautern-Landau, Department of Chemistry, Erwin-Schrödinger Straße 54, 67663, Kaiserslautern, Germany
| | - Christoph van Wüllen
- RPTU Kaiserslautern-Landau, Department of Chemistry and Forschungszentrum OPTIMAS, Erwin-Schrödinger Straße 54, 67663, Kaiserslautern, Germany
| | - Hans-Jörg Krüger
- RPTU Kaiserslautern-Landau, Department of Chemistry, Erwin-Schrödinger Straße 54, 67663, Kaiserslautern, Germany
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2
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Fischer TE, Janetzki JT, M Zahir FZ, Gable RW, Starikova AA, Boskovic C. Tuning valence tautomerism in a family of dinuclear cobalt complexes incorporating a conjugated bridging bis(dioxolene) ligand with weak communication. Dalton Trans 2024. [PMID: 38236053 DOI: 10.1039/d3dt04162j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
Valence tautomerism (VT) involves the stimulated reversible intramolecular electron transfer between a redox-active metal and ligand. Dinuclear cobalt complexes bridged by bis(dioxolene) ligands can undergo thermally-induced VT with access to {CoIII-cat-cat-CoIII}, {CoIII-cat-SQ-CoII} and {CoII-SQ-SQ-CoII} states (cat2- = catecholate, SQ˙- = semiquinonate, CoIII refers to low spin CoIII, CoII refers to high spin CoII). The resulting potential for two-step VT interconversions offers increased functionality over mononuclear examples. In this study, the bis(dioxolene) ligand 3,3',4,4'-tetrahydroxy-5,5'-dimethoxy-benzaldazine (thMH4) was paired with Mentpa (tpa = tris(2-pyridylmethyl)amine, n = 0-3 corresponds to methylation at 6-position of the pyridine rings) to afford [{Co(Mentpa)}2(thM)](PF6)2 (1a, n = 0; 2a, n = 2; 3a, n = 3). Structural, magnetic susceptibility and spectroscopic data show that 1a and 3a remain in the temperature invariant {CoIII-cat-cat-CoIII} and {CoII-SQ-SQ-CoII} forms in the solid state, respectively. In contrast, 2a exhibits incomplete thermally-induced VT between these two tautomeric forms via the mixed {CoIII-cat-SQ-CoII} tautomer. In solution, room temperature electronic absorption spectra are consistent with the assignments from the solid-state, with VT observed only for 2a. From electrochemistry, the proximity of the two 1e--processes for the thMn- ligand indicates weak electronic communication between the two dioxolene units, supporting the potential for a two-step VT interconversion in thMn- containing complexes. Comparison of the redox potentials of the Co and thMn- processes suggests that only 2a has these processes in sufficient proximity to afford the thermally-induced VT observed experimentally. Density functional theory calculations are consistent with the prerequisite energy ordering for a two-step transition for 2a, and temperature invariant {CoIII-cat-cat-CoIII} and {CoII-SQ-SQ-CoII} states for 1a and 3a, respectively. This work presents the third example, and the first formally conjugated example, of a bridging bis(dioxolene) ligand that can afford two-step VT in a Co complex, suggesting new possibilities towards applications based on multistep switching.
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Affiliation(s)
- Tristan E Fischer
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
| | - Jett T Janetzki
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
| | - F Zahra M Zahir
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
| | - Robert W Gable
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
| | - Alyona A Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, 344090, Rostov-on-Don, Russian Federation
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
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3
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Janetzki JT, Chegerev MG, Gransbury GK, Gable RW, Clegg JK, Mulder RJ, Jameson GNL, Starikova AA, Boskovic C. Controlling Spin Crossover in a Family of Dinuclear Fe(III) Complexes via the Bis(catecholate) Bridging Ligand. Inorg Chem 2023; 62:15719-15735. [PMID: 37691232 DOI: 10.1021/acs.inorgchem.3c02598] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Spin crossover (SCO) complexes can reversibly switch between low spin (LS) and high spin (HS) states, affording possible applications in sensing, displays, and molecular electronics. Dinuclear SCO complexes with access to [LS-LS], [LS-HS], and [HS-HS] states may offer increased levels of functionality. The nature of the SCO interconversion in dinuclear complexes is influenced by the local electronic environment. We report the synthesis and characterization of [{FeIII(tpa)}2spiro](PF6)2 (1), [{FeIII(tpa)}2Br4spiro](PF6)2 (2), and [{FeIII(tpa)}2thea](PF6)2 (3) (tpa = tris(2-pyridylmethyl)amine, spiroH4 = 3,3,3',3'-tetramethyl-1,1'-spirobi(indan)-5,5',6,6'-tetraol, Br4spiroH4 = 3,3,3',3'-tetramethyl-1,1'-spirobi(indan)-4,4',7,7'-tetrabromo-5,5',6,6'-tetraol, theaH4 = 2,3,6,7-tetrahydroxy-9,10-dimethyl-9,10-dihydro-9,10-ethanoanthracene), utilizing non-conjugated bis(catecholate) bridging ligands. In the solid state, magnetic and structural analysis shows that 1 remains in the [HS-HS] state, while 2 and 3 undergo a partial SCO interconversion upon cooling from room temperature involving the mixed [LS-HS] state. In solution, all complexes undergo SCO from [HS-HS] at room temperature, via [LS-HS] to mixtures including [LS-LS] at 77 K, with the extent of SCO increasing in the order 1 < 2 < 3. Gas phase density functional theory calculations suggest a [LS-LS] ground state for all complexes, with the [LS-HS] and [HS-HS] states successively destabilized. The relative energy separations indicate that ligand field strength increases following spiro4- < Br4spiro4- < thea4-, consistent with solid-state magnetic and EPR behavior. All three complexes show stabilization of the [LS-HS] state in relation to the midpoint energy between [LS-LS] and [HS-HS]. The relative stability of the [LS-HS] state increases with increasing ligand field strength of the bis(catecholate) bridging ligand in the order 1 < 2 < 3. The bromo substituents of Br4spiro4- increase the ligand field strength relative to spiro4-, while the stronger ligand field provided by thea4- arises from extension of the overlapping π-orbital system across the two catecholate units. This study highlights how SCO behavior in dinuclear complexes can be modulated by the bridging ligand, providing useful insights for the design of molecules that can be interconverted between more than two states.
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Affiliation(s)
- Jett T Janetzki
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Maxim G Chegerev
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don 344090, Russian Federation
| | - Gemma K Gransbury
- Department of Chemistry, The University of Manchester, Manchester M13 9PL, U.K
| | - Robert W Gable
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Jack K Clegg
- University of Queensland, St Lucia, Queensland 4072, Australia
| | | | - Guy N L Jameson
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Alyona A Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don 344090, Russian Federation
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
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4
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Atkin AM, Giansiracusa MJ, Calvello S, Rousset E, Gable RW, Phonsri W, Murray KS, Howard JK, Soncini A, Mole RA, Boskovic C. Inelastic Neutron Scattering Measurement of the Ground State Tunneling Gap in Tb and Ho Analogues of a Dy Field-Induced Single-Molecule Magnet. Inorg Chem 2023; 62:1141-1155. [PMID: 36630675 DOI: 10.1021/acs.inorgchem.2c03457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Recent advances in single-molecule magnet (SMM) research have placed great value on interpretation of inelastic neutron scattering (INS) data for rare earth (RE)-containing SMMs. Here, we present the synthesis of several rare earth complexes where combined magnetic and INS studies have been performed, supported by ab initio calculations. The reaction of rare earth nitrate salts with 2,2'-bipyridine (2,2'-bpy) and tetrahalocatecholate (X4Cat2-, X = Br, Cl) ligands in methanol (MeOH) afforded two new families of compounds [RE(2,2'-bpy)2(X4Cat)(X4CatH)(MeOH)] (X = Br and RE = Y, Eu, Gd, Tb, Dy, Ho, Yb for 1-RE; X = Cl and RE = Y, Tb, Dy, Ho, and Yb for 2-RE). Addition of triethylamine (Et3N) to the reaction mixture delivered Et3NH[RE(2,2'-bpy)2(Br4Cat)2] (3-RE, RE = Er and Yb). Interestingly, cerium behaves differently to the rest of the series, generating (2,2'-bpyH)2[Ce(Br4Cat)3(2,2'-bpy)] (4-Ce) with tetravalent Ce(IV) in contrast to the trivalent metal ions in 1-3. The static magnetic properties of 1-RE (RE = Gd, Tb, Dy and Ho) were investigated in conjunction with INS measurements on 1-Y, 1-Tb, and 1-Ho to probe their ground state properties and any crystal field excitations. To facilitate interpretation of the INS spectra and provide insight into the magnetic behavior, ab initio calculations were performed using the single-crystal X-ray diffraction structural data of 1-RE (RE = Tb, Dy and Ho). The ab initio calculations indicate ground doublets dominated by the maximal angular momentum projection states of Kramers type for 1-Dy and Ising type for 1-Tb and 1-Ho. Dynamic magnetic susceptibility measurements indicate that 1-Dy exhibits slow magnetic relaxation in the presence of a small applied magnetic field mainly through Raman pathways. Inelastic neutron scattering spectra exhibit distinct transitions corresponding to crystal field-induced tunneling gaps between the pseudo-doublet ground state components for 1-Tb and 1-Ho, which is one of the first direct experimental measurements with INS of such tunneling transitions in a molecular nanomagnet. The power of high-resolution INS is demonstrated with evidence of two distinct tunneling gaps measurable for the two crystallographically unique Tb coordination environments observed in the single crystal X-ray structure.
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Affiliation(s)
- Aiden M Atkin
- School of Chemistry, University of Melbourne, Parkville, Victoria3010, Australia
| | | | - Simone Calvello
- School of Chemistry, University of Melbourne, Parkville, Victoria3010, Australia.,Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC2232, Australia
| | - Elodie Rousset
- School of Chemistry, University of Melbourne, Parkville, Victoria3010, Australia
| | - Robert W Gable
- School of Chemistry, University of Melbourne, Parkville, Victoria3010, Australia
| | - Wasinee Phonsri
- School of Chemistry, Monash University, Clayton, Victoria3168, Australia
| | - Keith S Murray
- School of Chemistry, Monash University, Clayton, Victoria3168, Australia
| | - James K Howard
- Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC2232, Australia
| | - Alessandro Soncini
- School of Chemistry, University of Melbourne, Parkville, Victoria3010, Australia
| | - Richard A Mole
- Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC2232, Australia
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Parkville, Victoria3010, Australia
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5
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He Y, Huang YY, Fu JH, Liu Y, Wu XT, Sheng TL. Influence of the electronic effect of an ancillary ligand on MMCT and LMCT in localized cyanide-bridged complexes containing non-innocent ligands. Dalton Trans 2022; 51:18099-18108. [DOI: 10.1039/d2dt03048a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
For bimetallic MV complexes with non-innocent ligands, the MMCT energy in the localized system decreases significantly while the LMCT energy in the delocalized moiety increases slightly as the electronic effect of ancillary ligands is enhanced.
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Affiliation(s)
- Yong He
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P.R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P.R. China
| | - Ying-Ying Huang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P.R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P.R. China
| | - Jin-Hui Fu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P.R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P.R. China
| | - Yang Liu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P.R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P.R. China
| | - Xin-Tao Wu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P.R. China
| | - Tian-Lu Sheng
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P.R. China
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6
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Panza N, Tseberlidis G, Caselli A, Vicente R. Recent progresses in the chemistry of 12-membered pyridine-containing tetraazamacrocycles: From synthesis to catalysis. Dalton Trans 2022; 51:10635-10657. [DOI: 10.1039/d2dt00597b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article provides an overview (non-comprehensive) on recent developments regarding pyridine-containing 12-membered tetraazamacrocycles with pyclen or Py2N2 backbones and their metal complexes from 2017 to the present. Firstly, the synthesis...
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7
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Starikov AG, Starikova AA, Chegerev MG, Aldoshin SM, Metelitsa AV, Minkin VI. Spin‐State‐Switching Rearrangements of Bis(dioxolene)‐Bridged CrCo Complexes: A DFT Study. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Andrey G. Starikov
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Alyona A. Starikova
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Maxim G. Chegerev
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Sergey M. Aldoshin
- Institute of Problems of Chemical Physics Russian Academy of Sciences 1 Acad. Semenov Avenue 142432 Chernogolovka Russian Federation
| | - Anatoly V. Metelitsa
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Vladimir I. Minkin
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
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8
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Pakulski P, Pinkowicz D. 1,2,5-Thiadiazole 1,1-dioxides and Their Radical Anions: Structure, Properties, Reactivity, and Potential Use in the Construction of Functional Molecular Materials. Molecules 2021; 26:4873. [PMID: 34443461 PMCID: PMC8400987 DOI: 10.3390/molecules26164873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/07/2021] [Accepted: 08/09/2021] [Indexed: 11/19/2022] Open
Abstract
This work provides a summary of the preparation, structure, reactivity, physicochemical properties, and main uses of 1,2,5-thiadiazole 1,1-dioxides in chemistry and material sciences. An overview of all currently known structures containing the 1,2,5-thiadiazole 1,1-dioxide motif (including the anions radical species) is provided according to the Cambridge Structural Database search. The analysis of the bond lengths typical for neutral and anion radical species is performed, providing a useful tool for unambiguous assessment of the valence state of the dioxothiadiazole-based compounds based solely on the structural data. Theoretical methodologies used in the literature to describe the dioxothiadiazoles are also shortly discussed, together with the typical 'fingerprint' of the dioxothiadiazole ring reported by means of various spectroscopic techniques (NMR, IR, UV-Vis). The second part describes the synthetic strategies leading to 1,2,5-thiadiazole 1,1-dioxides followed by the discussion of their electrochemistry and reactivity including mainly the chemical methods for the successful reduction of dioxothiadiazoles to their anion radical forms and the ability to form coordination compounds. Finally, the magnetic properties of dioxothiadiazole radical anions and the metal complexes involving dioxothiadiazoles as ligands are discussed, including simple alkali metal salts and d-block coordination compounds. The last section is a prospect of other uses of dioxothiadiazole-containing molecules reported in the literature followed by the perspectives and possible future research directions involving these compounds.
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Affiliation(s)
- Paweł Pakulski
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Dawid Pinkowicz
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
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9
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Arczyński M, Pinkowicz D. Influence of the Increasing Number of Organic Radicals on the Structural, Magnetic, and Electrochemical Properties of the Copper(II)-Dioxothiadiazole Family of Complexes. Inorg Chem 2020; 59:13489-13501. [PMID: 32907320 PMCID: PMC7509843 DOI: 10.1021/acs.inorgchem.0c01904] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Indexed: 01/17/2023]
Abstract
The preparation, structures, and electrochemical and magnetic properties supported by density functional theory (DFT) calculations of three new copper(II) compounds with [1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 1,1-dioxide (td) and its radical anion (td·-) are reported: {[CuIICl(td)](μ-Cl)2[CuIICl(td)]} (1), which incorporates only neutral td ligands; [CuIICl(td·-)(td)]·2MeCN (2), which comprises one neutral td and one radical td·-; and PPN[CuIICl(td·-)2]·2DMA (3), where CuII ions are coordinated by two radical anions td·- (DMA, dimethylacetamide; PPN+, the bis(triphenylphosphine)iminium cation). All three compounds show interesting paramagnetic behavior with low-temperature features indicating significant antiferromagnetic coupling. The magnetic properties of 1 are dominated by CuII···CuII interactions (JCuCu) mediated through the Cl- bridges, while the magnetic properties of 2 and 3 are governed mainly by the td·-···td·- (Jtdtd) and CuII-td·- (JCutd) exchange interactions. The structure of 2 features only two major magnetic coupling pathways enabling the fitting of experimental data with Jtdtd = -36.0(5) cm-1 and JCutd = -12.6(2) cm-1 only. Compound 3 exhibits a complex network of magnetic contacts. Attempt to approximate its magnetic behavior using only a local magnetic contacts model resulted in Jtdtd = -5.6(1) cm-1 and two JCutd constants, -12.4(2) and -22.6(4) cm-1. The experimental fitting is critically compared with the results of broken symmetry density functional theory (BS DFT) calculations for inter- and intramolecular contacts. More consistent results were obtained with the M06 functional as opposed to popular B3LYP, which encountered problems reproducing some of the experimental intermolecular exchange interactions. Electrochemical measurements of 2 and 3 in MeCN showed three reversible nearly overlapping redox peaks appearing in a narrow potential range of -600 to -100 mV vs Fc/Fc+. Small differences between the redox events suggest that such compounds may be good candidates for new switchable materials, where the electron transfer between the metal and the ligand center is triggered by temperature, pressure, or light (valence tautomerism).
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Affiliation(s)
- Mirosław Arczyński
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Dawid Pinkowicz
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
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10
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Gransbury GK, Livesay BN, Janetzki JT, Hay MA, Gable RW, Shores MP, Starikova A, Boskovic C. Understanding the Origin of One- or Two-Step Valence Tautomeric Transitions in Bis(dioxolene)-Bridged Dinuclear Cobalt Complexes. J Am Chem Soc 2020; 142:10692-10704. [DOI: 10.1021/jacs.0c01073] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Gemma K. Gransbury
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Brooke N. Livesay
- Department of Chemistry, Colorado State University, Fort Collins 80523, United States
| | - Jett T. Janetzki
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Moya A. Hay
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Robert W. Gable
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Matthew P. Shores
- Department of Chemistry, Colorado State University, Fort Collins 80523, United States
| | - Alyona Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russian Federation
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
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11
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Starikova AA, Chegerev MG, Starikov AG. Mononuclear Cobalt and Iron o-Quinone Complexes with Tetradentate N-Donor Bases: Structures and Properties. RUSS J COORD CHEM+ 2020. [DOI: 10.1134/s1070328420030070] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Wang JH, Dai JW, Li ZY, Yamashita M. Strong antiferromagnetic coupling of the cobalt(ii)–semiquinone radical in a dinuclear complex with 2,2′-bipyrimidine ligands. NEW J CHEM 2020. [DOI: 10.1039/d0nj00767f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new dinuclear cobalt(ii)–semiquinone radical complex was synthesised and displayed strong antiferromagnetic exchange coupling, having −90.25 cm−1 of a J value, between the cobalt(ii) centres and semiquinone radicals.
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Affiliation(s)
- Jin-Hua Wang
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- P. R. China
| | - Jing-Wei Dai
- State Key Laboratory of Medicinal Chemical Biology
- Nankai University
- Tianjin 300071
- P. R. China
| | - Zhao-Yang Li
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- P. R. China
| | - Masahiro Yamashita
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- P. R. China
- WPI-Advanced Institute for Materials Research (AIMR)
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13
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Abstract
Metal–ligand cooperative redox reactions and intramolecular group transfer of a P–P containing dicobalt(i) species are shown.
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Affiliation(s)
- Seji Kim
- Department of Chemistry
- KAIST
- Daejeon, 34141
- Republic of Korea
| | - Yunho Lee
- Department of Chemistry
- KAIST
- Daejeon, 34141
- Republic of Korea
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14
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Mörtel M, Seller M, Heinemann FW, Khusniyarov MM. A valence tautomeric cobalt-dioxolene complex with an anchoring group for prospective chemical grafting to metal oxides. Dalton Trans 2020; 49:17532-17536. [PMID: 33300528 DOI: 10.1039/d0dt03771k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Here, we synthesized a valence tautomeric cobalt-dioxolene complex featuring a protected anchoring group. At room temperature, the complex reveals a nearly pure low-spin-Co(iii)-catecholate state in the solid state, but a nearly pure high-spin-Co(ii)-semiquinonate state in toluene solution. Thermal switchability of the complex in solution and in the solid state is investigated.
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Affiliation(s)
- Max Mörtel
- Friedrich-Alexander University Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Egerlandstr. 1, 91058, Erlangen, Germany.
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15
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Heterospin magnetically active bimetallic Fe and Co complexes of aldiminato-functionalized catechol: a DFT study. Struct Chem 2019. [DOI: 10.1007/s11224-019-01463-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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16
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Cannelli O, Bacellar C, Ingle RA, Bohinc R, Kinschel D, Bauer B, Ferreira DS, Grolimund D, Mancini GF, Chergui M. Toward time-resolved laser T-jump/X-ray probe spectroscopy in aqueous solutions. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2019; 6:064303. [PMID: 31832487 PMCID: PMC6906120 DOI: 10.1063/1.5129626] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 11/13/2019] [Indexed: 06/10/2023]
Abstract
Most chemical and biochemical reactions in nature and in industrial processes are driven by thermal effects that bring the reactants above the energy barrier for reaction. In aqueous solutions, this process can also be triggered by the laser driven temperature jump (T-jump) method, in which the water vibrational (stretch, bend, or combination) modes are excited by a short laser pulse, leading to a temperature increase in the irradiated volume within a few picoseconds. The combination of the laser T-jump with X-ray spectroscopic probes would add element-specificity as well as sensitivity to the structure, the oxidation state, and the spin state of the intermediates of reactions. Here, we present preliminary results of a near infrared pump/X-ray absorption spectroscopy probe to study the ligand exchange of an octahedral aqueous Cobalt complex, which is known to pass through intermediate steps yielding tetrahedral chlorinated as final species. The structural changes of the chemical reaction are monitored with great sensitivity, even in the presence of a mild local increase in temperature. This work opens perspectives for the study of non-light-driven reactions using time-resolved X-ray spectroscopic methods.
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Affiliation(s)
- O Cannelli
- Laboratory of Ultrafast Spectroscopy, Lausanne Center for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - C Bacellar
- Laboratory of Ultrafast Spectroscopy, Lausanne Center for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - R A Ingle
- Laboratory of Ultrafast Spectroscopy, Lausanne Center for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - R Bohinc
- Laboratory of Femtochemistry-MicroXAS, Paul Scherrer Institut, 5232 PSI Villigen, Switzerland
| | - D Kinschel
- Laboratory of Ultrafast Spectroscopy, Lausanne Center for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - B Bauer
- Laboratory of Ultrafast Spectroscopy, Lausanne Center for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - D S Ferreira
- Laboratory of Femtochemistry-MicroXAS, Paul Scherrer Institut, 5232 PSI Villigen, Switzerland
| | - D Grolimund
- Laboratory of Femtochemistry-MicroXAS, Paul Scherrer Institut, 5232 PSI Villigen, Switzerland
| | - G F Mancini
- Laboratory of Ultrafast Spectroscopy, Lausanne Center for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - M Chergui
- Laboratory of Ultrafast Spectroscopy, Lausanne Center for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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17
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Starikova AA, Chegerev MG, Starikov AG, Minkin VI. Rational Design of Electronically Labile Dinuclear Fe and Co complexes with 1,10-Phenanthroline-5,6-Diimine: A DFT study. J Comput Chem 2019; 40:2284-2292. [PMID: 31228286 DOI: 10.1002/jcc.26005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 06/04/2019] [Accepted: 06/04/2019] [Indexed: 01/27/2023]
Abstract
A series of coordination compounds of redox-active 1,10-phenanthroline-5,6-diimine with CoII bis-diketonates and FeII dihydrobis(pyrazolyl)borates has been computationally designed by means of density functional theory (DFT UB3LYP*/6-311++G(d,p)) calculations of their electronic structure, energy characteristics, and magnetic properties. Four types of complexes differing by the nature and position of the terminal metal-centered fragments have been considered. The performed systematic calculations have revealed the systems capable of undergoing thermally initiated spin-state switching rearrangements, including those governed by the synchronized mechanisms of spin crossover and valence tautomerism. The predicted magnetic characteristics allow one to consider the dinuclear cobalt complexes and heterometallic Co/Fe compounds with 1,10-phenanthroline-5,6-diimine as building blocks for molecular and quantum electronics devices. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Alyona A Starikova
- Institute of Physical and Organic Chemistry at Southern Federal University, Stachka Avenue 194/2, Rostov-on-Don, Russian Federation, 344090
| | - Maxim G Chegerev
- Institute of Physical and Organic Chemistry at Southern Federal University, Stachka Avenue 194/2, Rostov-on-Don, Russian Federation, 344090
| | - Andrey G Starikov
- Institute of Physical and Organic Chemistry at Southern Federal University, Stachka Avenue 194/2, Rostov-on-Don, Russian Federation, 344090
| | - Vladimir I Minkin
- Institute of Physical and Organic Chemistry at Southern Federal University, Stachka Avenue 194/2, Rostov-on-Don, Russian Federation, 344090
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18
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Starikova AA, Metelitsa EA, Minkin VI. Binuclear Di-o-Quinone Cobalt Complexes with the Acene Linker: Quantum Chemical Study of the Structures and Magnetic Properties. RUSS J COORD CHEM+ 2019. [DOI: 10.1134/s1070328419060095] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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19
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Ryland ES, Zhang K, Vura-Weis J. Sub-100 fs Intersystem Crossing to a Metal-Centered Triplet in Ni(II)OEP Observed with M-Edge XANES. J Phys Chem A 2019; 123:5214-5222. [DOI: 10.1021/acs.jpca.9b03376] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Elizabeth S. Ryland
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Kaili Zhang
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Josh Vura-Weis
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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20
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Li B, Zhao YM, Kirchon A, Pang JD, Yang XY, Zhuang GL, Zhou HC. Unconventional Method for Fabricating Valence Tautomeric Materials: Integrating Redox Center within a Metal-Organic Framework. J Am Chem Soc 2019; 141:6822-6826. [PMID: 30986355 DOI: 10.1021/jacs.9b02375] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Due to the structural advantages displayed by Metal-Organic Frameworks (MOFs), integrating Valence Tautomerism (VT) systems within MOFs could be an effective strategy in order to break through the constraints of the traditional ones. Herein, we report the first successful integration of a VT system into a MOF termed VT-MOF-1. The structural characteristics of VT-MOF-1, such as dinuclear cobalt-catechol clusters and solvent-accessible pores, are both innovative and novel, potentially yielding new vitality within VT field. In addition, VT-MOF-1 exhibits specific behaviors responsive to temperature and different solvent molecules as n-butanol, tert-butanol, and isopropyl alcohol. The entropy values and configurations of the solvent molecules might be responsible for the tunable sensing behaviors.
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Affiliation(s)
- Bao Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , People's Republic of China.,Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Yu-Meng Zhao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , People's Republic of China
| | - Angelo Kirchon
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Jian-Dong Pang
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Xin-Yu Yang
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Gui-Lin Zhuang
- Institute of Industrial Catalysis, College of Chemical Engineering , Zhejiang University of Technology , Zhejiang 310023 , People's Republic of China
| | - Hong-Cai Zhou
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States.,Department of Materials Science and Engineering , Texas A&M University , College Station , Texas 77842 , United States
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21
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Tezgerevska T, Rousset E, Gable RW, Jameson GNL, Sañudo EC, Starikova A, Boskovic C. Valence tautomerism and spin crossover in pyridinophane–cobalt–dioxolene complexes: an experimental and computational study. Dalton Trans 2019; 48:11674-11689. [DOI: 10.1039/c9dt02372k] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Variation of alkyl substituents on pyridinophane ancillary ligands governs temperature-dependent valence tautomeric or spin crossover equilibria in a family of cobalt–dioxolene complexes.
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Affiliation(s)
| | - Elodie Rousset
- School of Chemistry
- University of Melbourne
- Melbourne
- Australia
| | - Robert W. Gable
- School of Chemistry
- University of Melbourne
- Melbourne
- Australia
| | | | - E. Carolina Sañudo
- Departament de Química Inorgànica i Orgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
- Institut de Nanociència i Nanotecnologia
| | - Alyona Starikova
- Institute of Physical and Organic Chemistry
- Southern Federal University
- 344090 Rostov on Don
- Russian Federation
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22
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Wolny JA, Schünemann V, Németh Z, Vankó G. Spectroscopic techniques to characterize the spin state: Vibrational, optical, Mössbauer, NMR, and X-ray spectroscopy. CR CHIM 2018. [DOI: 10.1016/j.crci.2018.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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23
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Starikova AA, Minkin VI. Adducts of transition metal complexes with redox-active ligands: the structure and spin-state-switching rearrangements. RUSSIAN CHEMICAL REVIEWS 2018. [DOI: 10.1070/rcr4837] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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Drath O, Boskovic C. Switchable cobalt coordination polymers: Spin crossover and valence tautomerism. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2017.11.025] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Li B, Wang XN, Kirchon A, Qin JS, Pang JD, Zhuang GL, Zhou HC. Sophisticated Construction of Electronically Labile Materials: A Neutral, Radical-Rich, Cobalt Valence Tautomeric Triangle. J Am Chem Soc 2018; 140:14581-14585. [DOI: 10.1021/jacs.8b09062] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Bao Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Xiao-Ning Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
| | - Angelo Kirchon
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Jun-Sheng Qin
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Jian-Dong Pang
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Gui-Lin Zhuang
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Zhejiang 310023, People’s Republic of China
| | - Hong-Cai Zhou
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77842, United States
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26
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Drath O, Gable RW, Boskovic C. Structural investigation of one- and two-dimensional coordination polymers based on cobalt-bis(dioxolene) units and 1-hydroxy-1,2,4,5-tetrakis(pyridin-4-yl)cyclohexane. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2018; 74:734-741. [PMID: 29870010 DOI: 10.1107/s205322961800671x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 05/02/2018] [Indexed: 11/10/2022]
Abstract
The combination of cobalt, 3,5-di-tert-butyldioxolene (3,5-dbdiox) and 1-hydroxy-1,2,4,5-tetrakis(pyridin-4-yl)cyclohexane (tpch) yields two coordination polymers with different connectivities, i.e. a one-dimensional zigzag chain and a two-dimensional sheet. Poly[[bis(3,5-di-tert-butylbenzene-1,2-diolato)bis(1,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-yl-3-olato)[μ4-1-hydroxy-1,2,4,5-tetrakis(pyridin-4-yl)cyclohexane]cobalt(III)]-ethanol-water 1/7/5], {[Co2(C14H20O2)4(C26H24N4O)]·7C2H5OH·5H2O}n or {[Co2(3,5-dbdiox)4(tpch)}·7EtOH·5H2O}n, is the second structurally characterized example of a two-dimensional coordination polymer based on linked {Co(3,5-dbdiox)2} units. Variable-temperature single-crystal X-ray diffraction studies suggest that catena-poly[[[(3,5-di-tert-butylbenzene-1,2-diolato)(1,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-yl-3-olato)cobalt(III)]-μ-1-hydroxy-1,2,4,5-tetrakis(pyridin-4-yl)cyclohexane]-ethanol-water (1/1/5)], {[Co(C14H20O2)2(C26H24N4O)]·C2H5OH·5H2O}n or {[Co(3,5-dbdiox)2(tpch)]·EtOH·5H2O}n, undergoes a temperature-induced valence tautomeric interconversion.
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Affiliation(s)
- Olga Drath
- School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Robert W Gable
- School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Colette Boskovic
- School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
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27
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Bäppler F, Zimmer M, Dietrich F, Grupe M, Wallesch M, Volz D, Bräse S, Gerhards M, Diller R. Photophysical dynamics of a binuclear Cu(i)-emitter on the fs to μs timescale, in solid phase and in solution. Phys Chem Chem Phys 2018; 19:29438-29448. [PMID: 29077123 DOI: 10.1039/c7cp05791a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding subtle aspects of photophysical behavior is the key to design and synthesize new and improved luminescent materials. We contribute to this with an in-depth photophysical characterization of the binuclear copper complex Cu(i)-NHetPHOS-tris-m-tolylphosphine (1), a member of a recently established emitter class for ultra-efficient, printed organic light-emitting diodes (OLEDs). To this end we studied 1 in solution and in solid form, i.e. neat film and KBr-pellet, by means of femtosecond time-resolved transient absorption/reflectivity, time-correlated single photon counting (TCSPC), and nanosecond time-resolved step-scan FTIR spectroscopy. Using these methods, we explore the photoinduced dynamics from ultrafast Franck-Condon state deactivation until the decay of the luminescent states. Upon photoexcitation, we observed multiexponential dynamics in both solution (e.g. acetonitrile 0.8 ps, 59 ps, 3 ns, 11-13 ns) and in solid state (e.g. neat film 0.3 ps, 35 ps, 670 ps, 0.5-1 μs, 3.5-4.5 μs) with four to five time-constants that significantly depend on the type of sample. Quantum chemical calculations at the DFT level in combination with step-scan vibrational spectroscopy provided structural information about the electronic ground state S0 and the lowest lying excited state T1, and show that the latter is populated within 1 μs after photoexcitation. We found thermally activated delayed fluorescence (TADF) for this complex, which has been suggested to be the cause for its high efficiency in printed OLED devices. The results suggest that non-radiative processes, lowering the luminescence quantum yield in solution, are active on the ns to μs timescale.
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Affiliation(s)
- F Bäppler
- Physics Department, TU Kaiserslautern, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany.
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28
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Wang P, Killian MM, Saber MR, Qiu T, Yap GPA, Popescu CV, Rosenthal J, Dunbar KR, Brunold TC, Riordan CG. Electronic, Magnetic, and Redox Properties and O 2 Reactivity of Iron(II) and Nickel(II) o-Semiquinonate Complexes of a Tris(thioether) Ligand: Uncovering the Intradiol Cleaving Reactivity of an Iron(II) o-Semiquinonate Complex. Inorg Chem 2017; 56:10481-10495. [PMID: 28809555 PMCID: PMC6200398 DOI: 10.1021/acs.inorgchem.7b01491] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The iron(II) semiquinonate character within the iron(III) catecholate species has been proposed by numerous studies to account for the O2 reactivity of intradiol catechol dioxygenases, but a well-characterized iron(II) semiquinonate species that exhibits intradiol cleaving reactivity has not yet been reported. In this study, a detailed electronic structure description of the first iron(II) o-semiquinonate complex, [PhTttBu]Fe(phenSQ) [PhTttBu = phenyltris(tert-butylthiomethyl)borate; phenSQ = 9,10-phenanthrenesemiquinonate; Wang et al. Chem. Commun. 2014, 50, 5871-5873], was generated through a combination of electronic and Mössbauer spectroscopies, SQUID magnetometry, and density functional theory (DFT) calculations. [PhTttBu]Fe(phenSQ) reacts with O2 to generate an intradiol cleavage product, diphenic anhydride, in 16% yield. To assess the dependence of the intradiol reactivity on the identity of the metal ion, the nickel analogue, [PhTttBu]Ni(phenSQ), and its derivative, [PhTttBu]Ni(3,5-DBSQ) (3,5-DBSQ = 3,5-di-tert-butyl-1,2-semiquinonate), were prepared and characterized by X-ray crystallography, mass spectrometry, 1H NMR and electronic spectroscopies, and SQUID magnetometry. DFT calculations, evaluated on the basis of the experimental data, support the electronic structure descriptions of [PhTttBu]Ni(phenSQ) and [PhTttBu]Ni(3,5-DBSQ) as high-spin nickel(II) complexes with antiferromagnetically coupled semiquinonate ligands. Unlike its iron counterpart, [PhTttBu]Ni(phenSQ) decomposes slowly in an O2 atmosphere to generate 14% phenanthrenequinone with a negligible amount of diphenic anhydride. [PhTttBu]Ni(3,5-DBSQ) does not react with O2. This dramatic effect of the metal-ion identity supports the hypothesis that a metal(III) alkylperoxo species serves as an intermediate in the intradiol cleaving reactions. The redox properties of all three complexes were probed using cyclic voltammetry and differential pulse voltammetry, which indicate an inner-sphere electron-transfer mechanism for the formation of phenanthrenequinone. The lack of O2 reactivity of [PhTttBu]Ni(3,5-DBSQ) can be rationalized by the high redox potential of the metal-ligated 3,5-DBSQ/3,5-DBQ couple.
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Affiliation(s)
- Peng Wang
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Michelle M. Killian
- Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Mohamed R. Saber
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Tian Qiu
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Glenn P. A. Yap
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Codrina V. Popescu
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Joel Rosenthal
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Kim R. Dunbar
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Thomas C. Brunold
- Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Charles G. Riordan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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29
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Schäfer B, Bauer T, Faus I, Wolny JA, Dahms F, Fuhr O, Lebedkin S, Wille HC, Schlage K, Chevalier K, Rupp F, Diller R, Schünemann V, Kappes MM, Ruben M. A luminescent Pt2Fe spin crossover complex. Dalton Trans 2017; 46:2289-2302. [DOI: 10.1039/c6dt04360g] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A heterotrinuclear luminescent [Pt2Fe] spin crossover (SCO) complex was developed, synthesized, and investigated.
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