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Glatz J, Jiménez JR, Godeffroy L, von Bardeleben HJ, Fillaud L, Maisonhaute E, Li Y, Chamoreau LM, Lescouëzec R. Enlightening the Alkali Ion Role in the Photomagnetic Effect of FeCo Prussian Blue Analogues. J Am Chem Soc 2022; 144:10888-10901. [PMID: 35675503 DOI: 10.1021/jacs.2c03421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
FeCo Prussian blue analogues of general formula AxCoy[Fe(CN)6]z are responsive, non-stoichiometric materials whose magnetic and optical properties can be reversibly switched by light irradiation. However, elucidating the critical influence of the inserted alkali ion, A+, on the material's properties remains complicated due to their complex local structure. Here, by investigating soluble A ⊂ [Fe4-Co4] cyanido cubes (A = K, Rb, and Cs), both accurate structural and electronic information could be obtained. First, X-ray diffraction analyses reveal distinct interactions between the inserted A+ ions and the {Fe4-Co4} box, which impacts the structural distortion in the cubic framework. These distortions vanish, and a displacement of the small K+ ion from a corner toward the center is observed, as a cobalt corner CoIIHS is oxidized to CoIIILS. Second, cyclic voltammetry experiments performed at variable temperatures show distinct splitting of the CoIIHS ⇔ CoIIILS peak potentials for the different A+ cations, which can be qualitatively linked to different thermodynamic (standard potentials) and kinetic (energy barriers) parameters associated with the structural reorganization accompanying this redox-coupled spin state change. Moreover, for the first time, photomagnetism was investigated in frozen solution to avoid effects of intermolecular interactions. The results show that the metastable state is stabilized following the trend K > Rb > Cs. The outcome of these studies suggests that the interaction of the inserted alkali ions with the cyanide cage and the structural changes accompanying the electron transfer impact the stability of the photoinduced state and the relaxation temperature: the smaller the cation, the higher the structural reorganization and the associated energy barrier, and the more stable the metastable state.
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Affiliation(s)
- Jana Glatz
- Institut Parisien de Chimie Moléculaire, CNRS UMR 8232, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
| | - Juan-Ramón Jiménez
- Institut Parisien de Chimie Moléculaire, CNRS UMR 8232, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
| | - Louis Godeffroy
- Laboratoire Interface et Systèmes Electrochimiques, CNRS UMR 8235, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
| | - Hans Jurgen von Bardeleben
- Institut des Nanosciences de Paris, CNRS UMR 7588, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
| | - Laure Fillaud
- Laboratoire Interface et Systèmes Electrochimiques, CNRS UMR 8235, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
| | - Emmanuel Maisonhaute
- Laboratoire Interface et Systèmes Electrochimiques, CNRS UMR 8235, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
| | - Yanling Li
- Institut Parisien de Chimie Moléculaire, CNRS UMR 8232, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
| | - Lise-Marie Chamoreau
- Institut Parisien de Chimie Moléculaire, CNRS UMR 8232, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
| | - Rodrigue Lescouëzec
- Institut Parisien de Chimie Moléculaire, CNRS UMR 8232, Sorbonne Université, 4 place Jussieu, F-75252 Paris cedex 5, France
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2
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Kühne IA, Ozarowski A, Sultan A, Esien K, Carter AB, Wix P, Casey A, Heerah-Booluck M, Keene TD, Müller-Bunz H, Felton S, Hill S, Morgan GG. Homochiral Mn 3+ Spin-Crossover Complexes: A Structural and Spectroscopic Study. Inorg Chem 2022; 61:3458-3471. [PMID: 35175771 PMCID: PMC8889584 DOI: 10.1021/acs.inorgchem.1c03379] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Structural, magnetic,
and spectroscopic data on a Mn3+ spin-crossover complex
with Schiff base ligand 4-OMe-Sal2323, isolated in crystal
lattices with five different counteranions,
are reported. Complexes of [Mn(4-OMe-Sal2323)]X where X
= ClO4– (1), BF4– (2), NO3– (3), Br– (4), and I– (5) crystallize isotypically in the chiral
orthorhombic space group P21212 with a range of spin state preferences for the [Mn(4-OMe-Sal2323)]+ complex cation over the temperature range
5–300 K. Complexes 1 and 2 are high-spin,
complex 4 undergoes a gradual and complete thermal spin
crossover, while complexes 3 and 5 show
stepped crossovers with different ratios of spin triplet and quintet
forms in the intermediate temperature range. High-field electron paramagnetic
resonance was used to measure the zero-field splitting parameters
associated with the spin triplet and quintet states at temperatures
below 10 K for complexes 4 and 2 with respective
values: DS=1 = +23.38(1) cm–1, ES=1 = +2.79(1) cm–1,
and DS=2 =
+6.9(3) cm–1, with a distribution of E parameters for the S = 2 state. Solid-state circular
dichroism (CD) spectra on high-spin complex 1 at room
temperature reveal a 2:1 ratio of enantiomers in the chiral conglomerate,
and solution CD measurements on the same sample in methanol show that
it is stable toward racemization. Solid-state UV–vis absorption
spectra on high-spin complex 1 and mixed S = 1/S = 2 sample 5 reveal different
intensities at higher energies, in line with the different electronic
composition. The statistical prevalence of homochiral crystallization
of [Mn(4-OMe-Sal2323)]+ in five lattices with
different achiral counterions suggests that the chirality may be directed
by the 4-OMe-Sal2323 ligand. Zero-field
splitting parameters of the spin triplet and
quintet forms of a spin-crossover Mn3+ complex stabilized
in lattices with different counterions are measured by high-field
electron paramagnetic resonance at different frequencies. The homochiral
crystallization of the enantiopure Δ or Λ forms of the
chelate complex, despite the use of achiral anions, is attributed
to the steric influence of the ligand substituent.
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Affiliation(s)
- Irina A Kühne
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland.,FZU - Institute of Physics - Czech Academy of Sciences, Na Slovance 1999/2, Prague 8 182 21, Czech Republic
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Aizuddin Sultan
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Kane Esien
- School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, United Kingdom
| | - Anthony B Carter
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Paul Wix
- School of Chemistry & CRANN Institute & AMBER Centre, Trinity College Dublin, University of Dublin, College Green, Dublin 2, Ireland
| | - Aoife Casey
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | | | - Tony D Keene
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Helge Müller-Bunz
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Solveig Felton
- School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, United Kingdom
| | - Stephen Hill
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States.,Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Grace G Morgan
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland
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3
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Sundaresan S, Kühne IA, Evesson C, Harris MM, Fitzpatrick AJ, Ahmed A, Müller-Bunz H, Morgan GG. Compressed Jahn-Teller octahedra and spin quintet-triplet switching in coordinatively elastic manganese(III) complexes. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115386] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Hattori H, May JA. Direct bromination and iodination of the trispyrazolyl borate ligand in TpRu(nbd)Cl and the effect of Tp4−X ligands on redox potentials and catalysis. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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5
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Barker A, Kelly CT, Kühne IA, Hill S, Krzystek J, Wix P, Esien K, Felton S, Müller-Bunz H, Morgan GG. Spin state solvomorphism in a series of rare S = 1 manganese(iii) complexes. Dalton Trans 2019; 48:15560-15566. [PMID: 31342029 DOI: 10.1039/c9dt02476j] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Structural, magnetic and spectroscopic data of four complex salts, [Mn(napsal2323)]NTf2, 1,[Mn(napsal2323)]ClO4, 2, [Mn(napsal2323)]BF4, 3 and [Mn(napsal2323)]NO3, 4, of the [Mn(napsal2323)]+ complex cation indicate that the Mn3+ ion is stabilized in the rare S = 1 spin triplet form in this ligand sphere. Zero-field splitting values of D = +19.6 cm-1 and |E| = 2.02 cm-1 for complex 1 were obtained by High Field Electron Paramagnetic Resonance (HFEPR) measurements conducted over a range of frequencies. Structural and magnetic data also indicate that co-crystallization of complexes 2 and 3 with 0.5 equivalents of ethanol yields the high spin S = 2 forms of the perchlorate and tetrafluoroborate solvates [Mn(napsal2323)]ClO4·0.5(C2H5OH), 2·0.5EtOH and [Mn(napsal2323)]BF4·0.5(C2H5OH), 3·0.5EtOH.
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Affiliation(s)
- Andrew Barker
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland.
| | - Conor T Kelly
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland.
| | - Irina A Kühne
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland.
| | - Stephen Hill
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA and Department of Physics, Florida State University, Tallahassee, FL 32306, USA
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - Paul Wix
- School of Chemistry & CRANN Institute, Trinity College Dublin, University of Dublin, College Green, Dublin 2, Ireland
| | - Kane Esien
- Centre for Nanostructured Media (CNM), School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK
| | - Solveig Felton
- Centre for Nanostructured Media (CNM), School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK
| | - Helge Müller-Bunz
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland.
| | - Grace G Morgan
- School of Chemistry, University College Dublin (UCD), Belfield, Dublin 4, Ireland.
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6
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Cheng J, Wang L, Wang P, Deng L. High-Oxidation-State 3d Metal (Ti-Cu) Complexes with N-Heterocyclic Carbene Ligation. Chem Rev 2018; 118:9930-9987. [PMID: 30011189 DOI: 10.1021/acs.chemrev.8b00096] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
High-oxidation-state 3d metal species have found a wide range of applications in modern synthetic chemistry and materials science. They are also implicated as key reactive species in biological reactions. These applications have thus prompted explorations of their formation, structure, and properties. While the traditional wisdom regarding these species was gained mainly from complexes supported by nitrogen- and oxygen-donor ligands, recent studies with N-heterocyclic carbenes (NHCs), which are widely used for the preparation of low-oxidation-state transition metal complexes in organometallic chemistry, have led to the preparation of a large variety of isolable high-oxidation-state 3d metal complexes with NHC ligation. Since the first report in this area in the 1990s, isolable complexes of this type have been reported for titanium(IV), vanadium(IV,V), chromium(IV,V), manganese(IV,V), iron(III,IV,V), cobalt(III,IV,V), nickel(IV), and copper(II). With the aim of providing an overview of this intriguing field, this Review summarizes our current understanding of the synthetic methods, structure and spectroscopic features, reactivity, and catalytic applications of high-oxidation-state 3d metal NHC complexes of titanium to copper. In addition to this progress, factors affecting the stability and reactivity of high-oxidation-state 3d metal NHC species are also presented, as well as perspectives on future efforts.
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Affiliation(s)
- Jun Cheng
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry , University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , People's Republic of China
| | - Lijun Wang
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry , University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , People's Republic of China
| | - Peng Wang
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry , University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , People's Republic of China
| | - Liang Deng
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry , University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , People's Republic of China
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7
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Kurahashi T. Drastic Redox Shift and Electronic Structural Changes of a Manganese(III)-Salen Oxidation Catalyst upon Reaction with Hydroxide and Cyanide Ion. Inorg Chem 2018; 57:1066-1078. [DOI: 10.1021/acs.inorgchem.7b02474] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takuya Kurahashi
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki, Aichi 444-8787, Japan
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8
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Pflock S, Beyer A, Müller L, Burzlaff N. Homoleptic, di- and trivalent transition metal complexes with monoanionic N,N,O-heteroscorpionate ligands: Potential redox mediators for dye-sensitized solar cells? Polyhedron 2017. [DOI: 10.1016/j.poly.2016.08.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Garnier D, Jiménez JR, Li Y, von Bardeleben J, Journaux Y, Augenstein T, Moos EMB, Gamer MT, Breher F, Lescouëzec R. K⊂{[Fe II(Tp)(CN) 3] 4[Co III( pzTp)] 3[Co II( pzTp)]}: a neutral soluble model complex of photomagnetic Prussian blue analogues. Chem Sci 2016; 7:4825-4831. [PMID: 30155130 PMCID: PMC6014070 DOI: 10.1039/c6sc01435f] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 05/13/2016] [Indexed: 11/25/2022] Open
Abstract
Straightforward access to a new cyanide-bridged {Fe4Co4} "molecular box" containing a potassium ion, namely K⊂{[FeII(Tp)(CN)3]4[CoIII(pzTp)]3[CoII(pzTp)]} (1) (with Tp and pzTp = tris- and tetrakis(pyrazolyl)borate, respectively), is provided, alongside its full characterisation. A detailed analysis of the molecular structure (X-ray diffraction, mass spectrometry, NMR spectroscopy) and electronic properties (EPR spectroscopy, SQUID magnetometry, UV/Vis spectroscopy, cyclic voltammetry) reveals that 1 shows slow magnetic relaxation and a remarkable photomagnetic effect at low temperature which is reminiscent of some FeCo Prussian Blue Analogues (PBAs), and is ascribed to a photo-induced electron transfer. However, in contrast with these inorganic polymers, the overall neutral compound 1 is soluble and remarkably stable in organic solvents such as CH2Cl2. Moreover, 1 shows interesting redox versatility, with electrochemical experiments revealing the possible access to six stable redox states.
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Affiliation(s)
- D Garnier
- Institute of Inorganic Chemistry , Karlsruhe Institute of Technology (KIT) , Engesserstr. 15, Geb. 30.45 , D-76131 Karlsruhe , Germany .
- Institut Parisien de Chimie Moléculaire - CNRS UMR 8232 , UPMC - Paris 6 , Sorbonne Universités , 4 place Jussieu , F-75252 Paris cedex 05 , France .
| | - J-R Jiménez
- Institut Parisien de Chimie Moléculaire - CNRS UMR 8232 , UPMC - Paris 6 , Sorbonne Universités , 4 place Jussieu , F-75252 Paris cedex 05 , France .
| | - Y Li
- Institut Parisien de Chimie Moléculaire - CNRS UMR 8232 , UPMC - Paris 6 , Sorbonne Universités , 4 place Jussieu , F-75252 Paris cedex 05 , France .
| | - J von Bardeleben
- Institut des Nanosciences de Paris - CNRS UMR 7588 , UPMC - Paris 6 , Sorbonne Universités , 4 place Jussieu , F-75252 Paris cedex 05 , France
| | - Y Journaux
- Institut Parisien de Chimie Moléculaire - CNRS UMR 8232 , UPMC - Paris 6 , Sorbonne Universités , 4 place Jussieu , F-75252 Paris cedex 05 , France .
| | - T Augenstein
- Institute of Inorganic Chemistry , Karlsruhe Institute of Technology (KIT) , Engesserstr. 15, Geb. 30.45 , D-76131 Karlsruhe , Germany .
| | - E M B Moos
- Institute of Inorganic Chemistry , Karlsruhe Institute of Technology (KIT) , Engesserstr. 15, Geb. 30.45 , D-76131 Karlsruhe , Germany .
| | - M T Gamer
- Institute of Inorganic Chemistry , Karlsruhe Institute of Technology (KIT) , Engesserstr. 15, Geb. 30.45 , D-76131 Karlsruhe , Germany .
| | - F Breher
- Institute of Inorganic Chemistry , Karlsruhe Institute of Technology (KIT) , Engesserstr. 15, Geb. 30.45 , D-76131 Karlsruhe , Germany .
| | - R Lescouëzec
- Institut Parisien de Chimie Moléculaire - CNRS UMR 8232 , UPMC - Paris 6 , Sorbonne Universités , 4 place Jussieu , F-75252 Paris cedex 05 , France .
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10
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Jeong SY, Lalancette RA, Lin H, Lupinska P, Shipman PO, John A, Sheridan JB, Jäkle F. “Third-Generation”-Type Functional Tris(2-pyridyl)borate Ligands and Their Transition-Metal Complexes. Inorg Chem 2016; 55:3605-15. [DOI: 10.1021/acs.inorgchem.6b00124] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- So Yi Jeong
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Roger A. Lalancette
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Huina Lin
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Patrycja Lupinska
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Patrick O. Shipman
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Alexandra John
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - John B. Sheridan
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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11
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Pawar GM, Sheridan JB, Jäkle F. Pyridylborates as a New Type of Robust Scorpionate Ligand: From Metal Complexes to Polymeric Materials. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501373] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gajanan M. Pawar
- Department of Chemistry; Rutgers University Newark; 73 Warren Street 07102 Newark New Jersey United States
| | - John B. Sheridan
- Department of Chemistry; Rutgers University Newark; 73 Warren Street 07102 Newark New Jersey United States
| | - Frieder Jäkle
- Department of Chemistry; Rutgers University Newark; 73 Warren Street 07102 Newark New Jersey United States
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12
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Gardinier JR, Treleven AR, Meise KJ, Lindeman SV. Accessing spin-crossover behaviour in iron(ii) complexes of N-confused scorpionate ligands. Dalton Trans 2016; 45:12639-43. [DOI: 10.1039/c6dt01898j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Scorpionates with a dislocated pyrazolyl have been prepared on a large scale to allow new variations in iron(ii) spin-crossover materials.
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Affiliation(s)
| | - Alex R. Treleven
- Department of Chemistry
- Marquette University
- Milwaukee
- USA 53201-1881
| | - Kristin J. Meise
- Department of Chemistry
- Marquette University
- Milwaukee
- USA 53201-1881
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13
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Mlateček M, Dostál L, Růžičková Z, Honzíček J, Holubová J, Erben M. The first scorpionate ligand based on diazaphosphole. Dalton Trans 2015; 44:20242-53. [PMID: 26537349 DOI: 10.1039/c5dt03589a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of PhBCl2 with 1H-1,2,4-λ(3)-diazaphosphole in the presence of NEt3 gives a new scorpionate ligand, phenyl-tris(1,2,4-diazaphospholyl)borate (PhTdap). The coordination behaviour of this ligand toward transition and non-transition metals has been comprehensively studied. In the thallium(I) complex, Tl(PhTdap), κ(2)-N,N bonding supported with intramolecular η(3)-phenyl coordination has been observed in the solid state. Tl(PhTdap) also shows unusual intermolecular π-interactions between five-membered diazaphosphole rings and the thallium atom giving infinite molecular chains in the crystal. In the square planar complex [Pd(C,N-C6H4CH2NMe2)(PhTdap)], κ(2)-bonded scorpionate has been detected in both solution and in the solid state. For other studied compounds with the central metal ion Ti(IV), Mo(II), Mn(I), Fe(II), Ru(II), Co(II), Co(III), Ni(II) and Cd(II), the κ(3)-N,N,N coordination pattern was observed. Electronic properties of PhTdap and its ligand-field strength were elucidated from UV-Vis spectra of transition-metal species. The CH/P replacement on going from tris(pyrazolyl)borate to the ligand PhTdap causes a slight increase in electronic density rendered to the central metal atom. The following order of ligand-field strength has been established: HB(3,5-Me2pz)3 < PhB(pz)3 < HB(1,2,4-triazolyl) < HB(pz)3 < PhB(1,2,4-triazolyl) < PhTdap. The crystal structures of ten metal complexes bearing the new ligand are reported. The possibility of PhTdap coordination through the phosphorus atom is also briefly discussed.
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Affiliation(s)
- Martin Mlateček
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, Czech Republic
| | - Libor Dostál
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, Czech Republic
| | - Jan Honzíček
- Institute of Chemistry and Technology of Macromolecular Materials, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic.
| | - Jana Holubová
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, Czech Republic
| | - Milan Erben
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, Czech Republic
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14
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Hewage JS, Wanniarachchi S, Morin TJ, Liddle BJ, Banaszynski M, Lindeman SV, Bennett B, Gardinier JR. Homoleptic nickel(II) complexes of redox-tunable pincer-type ligands. Inorg Chem 2014; 53:10070-84. [PMID: 25222027 PMCID: PMC5047063 DOI: 10.1021/ic500657e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Different synthetic methods have been developed to prepare eight new redox-active pincer-type ligands, H(X,Y), that have pyrazol-1-yl flanking donors attached to an ortho-position of each ring of a diarylamine anchor and that have different groups, X and Y, at the para-aryl positions. Together with four previously known H(X,Y) ligands, a series of 12 Ni(X,Y)2 complexes were prepared in high yields by a simple one-pot reaction. Six of the 12 derivatives were characterized by single-crystal X-ray diffraction, which showed tetragonally distorted hexacoordinate nickel(II) centers. The nickel(II) complexes exhibit two quasi-reversible one-electron oxidation waves in their cyclic voltammograms, with half-wave potentials that varied over a remarkable 700 mV range with the average of the Hammett σ(p) parameters of the para-aryl X, Y groups. The one- and two-electron oxidized derivatives [Ni(Me,Me)2](BF4)n (n = 1, 2) were prepared synthetically, were characterized by X-band EPR, electronic spectroscopy, and single-crystal X-ray diffraction (for n = 2), and were studied computationally by DFT methods. The dioxidized complex, [Ni(Me,Me)2](BF4)2, is an S = 2 species, with nickel(II) bound to two ligand radicals. The mono-oxidized complex [Ni(Me,Me)2](BF4), prepared by comproportionation, is best described as nickel(II) with one ligand centered radical. Neither the mono- nor the dioxidized derivative shows any substantial electronic coupling between the metal and their bound ligand radicals because of the orthogonal nature of their magnetic orbitals. On the other hand, weak electronic communication occurs between ligands in the mono-oxidized complex as evident from the intervalence charge transfer (IVCT) transition found in the near-IR absorption spectrum. Band shape analysis of the IVCT transition allowed comparisons of the strength of the electronic interaction with that in the related, previously known, Robin-Day class II mixed valence complex, [Ga(Me,Me)2](2+).
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Affiliation(s)
- Jeewantha S. Hewage
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
| | - Sarath Wanniarachchi
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
| | - Tyler J. Morin
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
| | - Brendan J. Liddle
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
| | - Megan Banaszynski
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
| | - Sergey V. Lindeman
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
| | - Brian Bennett
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, United States
| | - James R. Gardinier
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
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Gruden-Pavlović M, Stepanović S, Perić M, Güell M, Swart M. A density functional study of the spin state energetics of polypyrazolylborato complexes of first-row transition metals. Phys Chem Chem Phys 2014; 16:14514-22. [DOI: 10.1039/c3cp55488k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Harb C, Kravtsov P, Choudhuri M, Sirianni ER, Yap GPA, Lever ABP, Crutchley RJ. Phenylcyanamidoruthenium scorpionate complexes. Inorg Chem 2013; 52:1621-30. [PMID: 23339541 DOI: 10.1021/ic302535h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nine [Ru(Tp)(dppe)L] complexes, where Tp is hydrotris(pyrazol-1-yl)borate, dppe is ethylenebis(diphenylphosphine), and L is (4-nitrophenyl)cyanamide (NO(2)pcyd(-)), (2-chlorophenyl)cyanamide (2-Clpcyd(-)), (3-chlorophenyl)cyanamide (3-Clpcyd(-)), (2,4-dichlorophenyl)cyanamide (2,4-Cl(2)pcyd(-)), (2,3-dichlorophenyl)cyanamide (2,3-Cl(2)pcyd(-)), (2,5-dichlorophenyl)cyanamide (2,5-Cl(2)pcyd(-)), (2,4,5-trichlorophenyl)cyanamide (2,4,5-Cl(3)pcyd(-)), (2,3,5,6-tetrachlorophenyl)cyanamide (2,3,5,6-Cl(4)pcyd(-)), and (pentachlorophenyl)cyanamide (Cl(5)pcyd(-)), and the dinuclear complex [{Ru(Tp)(dppe)}(2)(μ-adpc)], where adpc(2-) is azo-4,4-diphenylcyanamide, have been prepared and characterized. The crystal structures of [Ru(Tp)(dppe)(Cl(5)pcyd)] and [{Ru(Tp)(dppe)}(2)(μ-adpc)] reveal the Ru(II) ion to occupy a pseudooctahedral coordination sphere in which the cyanamide ligand coordinates to Ru(II) by its terminal nitrogen atom. For both complexes, the cyanamide ligands are planar, indicating significant π mixing between the cyanamide and phenyl moieties as well as the azo group in the case of adpc(2-). The optical spectra of the nominally ruthenium(III) species [Ru(Tp)(dppe)L](+) were obtained through spectroelectrochemistry measurements and showed an intense near-IR absorption band. Time-dependent density functional theory calculations of these species revealed that oxidation of the ruthenium(II) species led to species where partial oxidation of the cyanamide ligand had occurred, indicative of noninnocent character for these ligands. The spin densities reveal that while the 3-Clpycd species has substantial Ru(II)(3-Clpycd(0)) character, the Cl(5)pycd species is a much more localized ruthenium(III) complex of the Cl(5)pycd monoanion. Some bond order and charge distribution data are derived for these ruthenium(III) species. The near-IR band is assigned as a quite complex mixture of d-d, 4d(π) to L(NCN) MLCT, and L(NCN) to Ru 4d LMCT with even a scorpionate ligand component. Spectroelectrochemistry was also performed on [{Ru(Tp)(dppe)}(2)(μ-adpc)] to generate the mixed-valence state. The intense intervalence transition that is observed in the near-IR is very similar to that previously reported for [{Ru(trpy)(bpy)}(2)(μ-adpc)](2+), where trpy is 2,2':6',2"-terpyridine and bpy is 2,2'-bipyridine, and by analogy identifies [{Ru(Tp)(dppe)}(2)(μ-adpc)](+) as a delocalized mixed-valence complex.
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Affiliation(s)
- Carmen Harb
- Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada
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17
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Forshaw AP, Smith JM, Ozarowski A, Krzystek J, Smirnov D, Zvyagin SA, Harris TD, Karunadasa HI, Zadrozny JM, Schnegg A, Holldack K, Jackson TA, Alamiri A, Barnes DM, Telser J. Low-Spin Hexacoordinate Mn(III): Synthesis and Spectroscopic Investigation of Homoleptic Tris(pyrazolyl)borate and Tris(carbene)borate Complexes. Inorg Chem 2012; 52:144-59. [DOI: 10.1021/ic301630d] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adam P. Forshaw
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, United
States
| | - Jeremy M. Smith
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, United
States
| | - Andrew Ozarowski
- National High Magnetic
Field Laboratory (NHMFL), Florida State University, Tallahassee, Florida 32310, United States
| | - J. Krzystek
- National High Magnetic
Field Laboratory (NHMFL), Florida State University, Tallahassee, Florida 32310, United States
| | - Dmitry Smirnov
- National High Magnetic
Field Laboratory (NHMFL), Florida State University, Tallahassee, Florida 32310, United States
| | - S. A. Zvyagin
- Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314
Dresden, Germany
| | - T. David Harris
- Department
of Chemistry, Northwestern University,
Evanston, Illinois 60208, United States
| | | | - Joseph M. Zadrozny
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Alexander Schnegg
- Helmholtz-Zentrum für Materialien
und Energie, Institut für Silizium-Photovoltaik, D-12489 Berlin, Germany
| | - Karsten Holldack
- Helmholtz-Zentrum für Materialien und Energie, Institut für Methoden und Instrumente der Forschung mit Synchrotronstrahlung, D-12489 Berlin, Germany
| | - Timothy A. Jackson
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Ahmad Alamiri
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United
States
| | - Diane M. Barnes
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United
States
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United
States
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18
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Liang S, Wang H, Deb T, Petersen JL, Yee GT, Jensen MP. Structural and Spectroscopic Trends in a Series of Half-Sandwich Scorpionate Complexes. Inorg Chem 2012; 51:12707-19. [DOI: 10.1021/ic301409s] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Shengwen Liang
- Department of Chemistry and
Biochemistry, Ohio University, Athens,
Ohio 45701, United States
| | - Haoshuang Wang
- Department of Chemistry and
Biochemistry, Ohio University, Athens,
Ohio 45701, United States
| | - Tapash Deb
- Department of Chemistry and
Biochemistry, Ohio University, Athens,
Ohio 45701, United States
| | - Jeffrey L. Petersen
- C. Eugene Bennett Department
of Chemistry, West Virginia University,
Morgantown, West Virginia 26506, United States
| | - Gordon T. Yee
- Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg,
Virginia 24061, United States
| | - Michael P. Jensen
- Department of Chemistry and
Biochemistry, Ohio University, Athens,
Ohio 45701, United States
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19
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Redox coupled-spin crossover in cobalt β-diketonate complexes: Structural, electrochemical and computational studies. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.05.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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20
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Chen F, Wang GF, Li YZ, Chen XT, Xue ZL. Syntheses, structures and electrochemical properties of homoleptic ruthenium(III) and osmium(III) complexes bearing two tris(carbene)borate ligands. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2012.04.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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Qin Y, Shipman PO, Jäkle F. Self-Assembly of Borane End-Functionalized Polystyrene Through Tris(1-pyrazolyl)borate (Tp) Iron(II) Linkages. Macromol Rapid Commun 2012; 33:562-7. [DOI: 10.1002/marc.201100628] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 12/19/2011] [Indexed: 11/05/2022]
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22
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Hughes TF, Friesner RA. Development of Accurate DFT Methods for Computing Redox Potentials of Transition Metal Complexes: Results for Model Complexes and Application to Cytochrome P450. J Chem Theory Comput 2012; 8:442-59. [DOI: 10.1021/ct2006693] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas F. Hughes
- Department of Chemistry,
Columbia University, New York,
New York 10027, United States
| | - Richard A. Friesner
- Department of Chemistry,
Columbia University, New York,
New York 10027, United States
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23
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Cui C, Lalancette RA, Jäkle F. The elusive tripodal tris(2-pyridyl)borate ligand: a strongly coordinating tetraarylborate. Chem Commun (Camb) 2012; 48:6930-2. [DOI: 10.1039/c2cc33059h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Wang GF, Song XJ, Chen F, Li YZ, Chen XT, Xue ZL. Formation of stable iron/cobalt NHC complexes via unexpected ring opening and in situ generation of a tridentate ligand. Dalton Trans 2012; 41:10919-22. [DOI: 10.1039/c2dt30894k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Tang M, Li D, Mallik UP, Zhang YZ, Clérac R, Yee GT, Whangbo MH, Mungalimane A, Holmes SM. Synthesis and characterization of di- and trivalent pyrazolylborate β-diketonates and cyanometalates. Inorg Chem 2011; 50:5153-64. [PMID: 21520919 DOI: 10.1021/ic200464t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The syntheses, structures, and magnetic properties of a series of di- and trivalent hydridotris(3,5-dimethylpyrazol-1-yl)borate (Tp*) cyanomanganates are described. Treatment of tris(acetylacetonate)manganese(III) [Mn(acac)(3)] with KTp* and tetra(ethyl)ammonium cyanide affords [NEt(4)][(Tp*)Mn(II)(κ(2)-acac)(CN)] (1), as the first monocyanomanganate(II) complex; attempted oxidation of 1 with iodine affords {(Tp*)Mn(II)(κ(2)-acac(3-CN))}(n) (2) as a one-dimensional chain and bimetallic {[NEt(4)][(Tp*)Mn(II)(κ(2)-acac(3-CN))](2)(μ-CN) (3) as the major and minor products, respectively. A fourth complex, [NEt(4)][(Tp*)Mn(II)(η(2)-acac(3-CN))(η(1)-NC-acac)] (4), is obtained via treatment of Mn(acac(3-CN))(3) with KTp* and [NEt(4)]CN, while [NEt(4)](2)[Mn(II)(CN)(4)] (5) was prepared from manganese(II) trifluoromethanesulfonate and excess [NEt(4)]CN. Tricyanomanganate(III) complexes, [cat][(Tp*)Mn(III)(CN)(3)] [cat = NEt(4)(+), 7; PPN(+), 8], are prepared via sequential treatment of Mn(acac(3-CN))(3) with KTp*, followed by [NEt(4)]CN, or [cat](3)[Mn(III)(CN)(6)] with (Tp*)SnBu(2)Cl. Magnetic measurements indicate that 1, 2, and 4 contain isotropic Mn(II) (S = (5)/(2); g = 2.00) centers, and no long-range magnetic ordering is found above 1.8 K. Compounds 7 and 8 contain S = 1 Mn(III) centers that adopt singly degenerate spin ground states without orbital contributions to their magnetic moments.
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Affiliation(s)
- Minao Tang
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA
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26
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27
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Hatfield TL, Staples RJ, Pierce DT. Structure Change Associated with the [MII/III 1,4,7-Triazacyclononane-N,N′,N′′-triacetate (TCTA)]−/0 Electron Transfers (M = Mn, Fe, and Ni): Crystal Structure for [FeII(H2O)6][FeII(TCTA)]2. Inorg Chem 2010; 49:9312-20. [DOI: 10.1021/ic100933t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas L Hatfield
- Department of Chemistry, University of North Dakota, Grand Forks, North Dakota 58202, USA
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28
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Kuzu I, Krummenacher I, Hewitt I, Lan Y, Mereacre V, Powell AK, Höfer P, Harmer J, Breher F. Syntheses, Structures and Electronic Properties of Zwitterionic Iron(II) and Cobalt(II) Complexes Featuring Ambidentate Tris(pyrazolyl)methanide Ligands. Chemistry 2009; 15:4350-65. [DOI: 10.1002/chem.200802317] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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29
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Lord RL, Schultz FA, Baik MH. Spin Crossover-Coupled Electron Transfer of [M(tacn)2]3+/2+ Complexes (tacn = 1,4,7-Triazacyclononane; M = Cr, Mn, Fe, Co, Ni). J Am Chem Soc 2009; 131:6189-97. [DOI: 10.1021/ja809552p] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Richard L. Lord
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Chemical Biology, Indiana University Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46402
| | - Franklin A. Schultz
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Chemical Biology, Indiana University Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46402
| | - Mu-Hyun Baik
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Chemical Biology, Indiana University Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46402
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30
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Synthesis, Crystal Structures and Redox Properties of Mixed‐Sandwich Complexes of Ruthenium(II) with Cyclopentadienyl and Tris(pyrazolyl)methane Ligands. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200801112] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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Morin TJ, Bennett B, Lindeman SV, Gardinier JR. First-row transition-metal complexes of a new pentadentate ligand, alpha,alpha,alpha',alpha'-tetra(pyrazolyl)lutidine. Inorg Chem 2008; 47:7468-70. [PMID: 18681427 DOI: 10.1021/ic801093q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new pentadentate ligand, alpha,alpha,alpha',alpha'-tetra(pyrazolyl)lutidine, pz 4lut, has been prepared by a CoCl 2-catalyzed rearrangement reaction between 2,6-pyridinedicarboxaldehyde and dipyrazolylthione. The coordination chemistry with some divalent first-row transition metal (Mn, Fe, Co, Ni, Cu, and Zn) chlorides has been explored. The electronic properties indicate that the new kappa (5)N ligand is a slightly stronger-field donor to Ni (2+) and Co (2+) than a related pentadentate ligand with five pyridyl donors presumably because of greater interaction between the metal and axial pyridyl.
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Affiliation(s)
- Tyler J Morin
- Department of Chemistry, Marquette University, Milwaukee Wisconsin 53201-1881, USA
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33
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Chemistry Surrounding Group 7 Complexes that Possess Poly(pyrazolyl)borate Ligands. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2008. [DOI: 10.1016/s0065-3055(07)56002-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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34
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Forshaw AP, Bontchev RP, Smith JM. Oxidation of the Tris(carbene)borate Complex PhB(MeIm)3MnI(CO)3 to MnIV[PhB(MeIm)3]2(OTf)2. Inorg Chem 2007; 46:3792-4. [PMID: 17425307 DOI: 10.1021/ic070187w] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction of the tris(carbene)borate ligand PhB(MeIm)3- with [Mn(CO)3(tBuCN)Br]2 leads to the manganese(I) tricarbonyl complex PhB(MeIm)3Mn(CO)3. In contrast to related complexes that are air-stable, PhB(MeIm)3Mn(CO)3 is O2-sensitive and is converted to a homoleptic MnIV complex. IR and cyclic voltammetry measurements of these complexes establish the exceptionally strong donating nature of the tris(carbene)borate ligand.
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Affiliation(s)
- Adam P Forshaw
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA
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35
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Xing YH, Yuan HQ, Zhang BL, Zhang YH, Niu SY, Bai FY. Syntheses, solid-state structures and thermal analyses of M(Bp)2 (M=Cu, Ni) (Bp=H2B(pyrazolyl)2). J COORD CHEM 2007. [DOI: 10.1080/00958970600793828] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Yong Heng Xing
- a College of Chemistry and Chemical Engineering , Liaoning Normal University , Huanghe Road 850#, Dalian, China , 116029
| | - Hou Qun Yuan
- a College of Chemistry and Chemical Engineering , Liaoning Normal University , Huanghe Road 850#, Dalian, China , 116029
| | - Bao Li Zhang
- a College of Chemistry and Chemical Engineering , Liaoning Normal University , Huanghe Road 850#, Dalian, China , 116029
| | - Yuan Hong Zhang
- a College of Chemistry and Chemical Engineering , Liaoning Normal University , Huanghe Road 850#, Dalian, China , 116029
| | - Shu Yun Niu
- a College of Chemistry and Chemical Engineering , Liaoning Normal University , Huanghe Road 850#, Dalian, China , 116029
| | - Feng Ying Bai
- a College of Chemistry and Chemical Engineering , Liaoning Normal University , Huanghe Road 850#, Dalian, China , 116029
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36
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Nolet MC, Michaud A, Bain C, Zargarian D, Reber C. Allowed and Forbidden d-d Transitions in Poly(3,5-dimethylpyrazolyl)methane Complexes of Nickel(II)†. Photochem Photobiol 2006; 82:57-63. [PMID: 16180948 DOI: 10.1562/2005-06-28-ra-593] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Absorption spectra of four nickel(II) complexes with poly(pyrazolyl)methane ligands are presented in the NIR-VIS-UV region and the band system corresponding to the lowest-energy spin-allowed and spin-forbidden transitions is analyzed. A quantitative theoretical model involving coupled electronic states provides precise energies for the lowest-energy triplet and singlet excited states and allows comparisons between complexes with a variable number of nitrogen and oxygen ligator atoms. Singlet energies between 12,840 and 13,000 cm(-1) are determined for heteroleptic complexes. These energies are in an intermediate range between those for homoleptic complexes with either nitrogen or oxygen ligator atoms with singlet states at approximately 12,000 and 14,000 cm(-1), respectively. The new theoretical approach is compared to the traditional ligand-field parameters obtained from the maxima of the broad, spin-allowed absorption bands.
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37
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Jenkins DM, Peters JC. Spin-State Tuning at Pseudotetrahedral d7 Ions: Examining the Structural and Magnetic Phenomena of Four-Coordinate [BP3]CoII−X Systems. J Am Chem Soc 2005; 127:7148-65. [PMID: 15884957 DOI: 10.1021/ja045310m] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electronic structure, spin-state, and geometrical relationships for a series of pseudotetrahedral Co(II) aryloxide, siloxide, arylthiolate, and silylthiolate complexes supported by the tris(phosphino)borate [BP(3)] ligands [PhBP(3)] and [PhBP(i)()(Pr)(3)] ([PhB(CH(2)PPh(2))(3)](-) and [PhB(CH(2)P(i)()Pr(2))(3)](-), respectively) are described. Standard (1)H NMR, optical, electrochemical, and solution magnetic data, in addition to low-temperature EPR and variable temperature SQUID magnetization data, are presented for the new cobalt(II) complexes [PhBP(3)]CoOSiPh(3) (2), [PhBP(3)]CoO(4-(t)()Bu-Ph) (3), [PhBP(3)]CoO(C(6)F(5)) (4), [PhBP(3)]CoSPh (5), [PhBP(3)]CoS(2,6-Me(2)-Ph) (6), [PhBP(3)]CoS(2,4,6-(i)()Pr(3)-Ph) (7), [PhBP(3)]CoS(2,4,6-(t)()Bu(3)-Ph) (8), [PhBP(3)]CoSSiPh(3) (9), [PhBP(3)]CoOSi(4-NMe(2)-Ph)(3) (10), [PhBP(3)]CoOSi(4-CF(3)-Ph)(3) (11), [PhBP(3)]CoOCPh(3) (12), [PhBP(i)()(Pr)(3)]CoOSiPh(3) (14), and [PhBP(i)()(Pr)(3)]CoSSiPh(3) (15). The low-temperature solid-state crystal structures of 2, 3, 5-10, 12, and 15 are also described. These pseudotetrahedral cobalt(II) complexes are classified as featuring one of two limiting distortions, either umbrella or off-axis. Magnetic and spectroscopic data demonstrate that both S = (1)/(2) and S = (3)/(2) ground-state electronic configurations are accessible for the umbrella distorted structure type, depending on the nature of the X-type ligand, its denticity (eta(1) versus eta(3)), and the tripodal phosphine ligand employed. Off-axis distorted complexes populate an S = (1)/(2) ground-state exclusively. For those four-coordinate complexes that populate S = (1)/(2) ground states, X-ray data show two Co-P bond distances that are invariably shorter than a third Co-P bond. The pseudotetrahedral siloxides 2, 10, and 11 are exceptional in that they display gradual spin crossover in the solid state. The diamagnetic cobalt(III) complex {[PhBP(3)]CoOSiPh(3)}{BAr(4)} ({16}{BAr(4)}) (Ar = Ph or 3,5-(CF(3))(2)-C(6)H(3)) has also been prepared and structurally characterized. Accompanying electronic structure calculations (DFT) for complexes 2, 6, and {16}(+) support the notion of a close electronic structure relationship between these four-coordinate systems and octahedral, sandwich, and half-sandwich coordination complexes.
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Affiliation(s)
- David M Jenkins
- Division of Chemistry and Chemical Engineering, Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, CA 91125. USA
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38
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Onishi M, Kayano KH, Inada KI, Yamaguchi H, Nagaoka J, Arikawa Y, Takatani T. Syntheses, properties, and structural characteristics of several new [tetrakis(1-pyrazolyl)borato]samarium(III) complexes: comparative study of the B(pyrazolyl)4 and BH(pyrazolyl)3 ligation. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.06.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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39
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Coupled electron-transfer and spin-exchange reactions of metal–bis[tris(pyrazolyl)methane] complexes. Polyhedron 2004. [DOI: 10.1016/j.poly.2004.01.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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