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Schepper JDW, Orthaber A, Pammer F. Preparation of Structurally and Electronically Diverse N → B-Ladder Boranes by [2 + 2 + 2] Cycloaddition. J Org Chem 2021; 86:14767-14776. [PMID: 34613723 DOI: 10.1021/acs.joc.1c01402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the synthesis of a series of eight N → B-ladder boranes through cobalt-mediated cyclotrimerization of (2-cyanophenyl)-dimesitylborane with different dialkynes. The resulting tetracoordinate boranes show variable electrochemical and optical properties depending on the substitution pattern in the backbone of the coordinating pyridine-derivatives. While boranes containing alkyl-substituted pyridines show lower electron affinities than the known parent compound, boranes featuring π-extended pyridine derivatives show higher electron affinities in the range of acceptor substituted triarylboranes. All derivatives show larger Stokes shifts (8790-6920 cm-1) compared to the N → B-ladder borane coordinated by an unsubstituted pyridine.
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Affiliation(s)
- Jonas D W Schepper
- Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Andreas Orthaber
- Department of Chemistry, Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala, Sweden
| | - Frank Pammer
- Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany.,Helmholtz-Institut Ulm, Helmholtzstrasse 11, D-89081 Ulm, Germany
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2
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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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Braun CA, Ferguson MJ, Rivard E. Tellura(benzo)bithiophenes: Synthesis, Oligomerization, and Phosphorescence. Inorg Chem 2021; 60:2672-2679. [PMID: 33481578 DOI: 10.1021/acs.inorgchem.0c03559] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of planar π-extended Te-containing heteroacenes, termed tellura(benzo)bithiophenes, were synthesized. This new structural class of heterocycle features a tellurophene ring fused to a benzobithiophene unit with aromatic side groups (either -C6H4iPr or -C6H4OCH3) positioned at the 2- and 5-positions of the tellurophene moiety. Although attempts to enhance molecular rigidity and extend ring-framework π-delocalization in a cumenyl (-C6H4iPr)-capped tellura(benzo)bithiophene led to oxidation (and Te-C bond scission) to form a diene-one, the formation of an oligomeric tellura(benzo)bithiophene was possible via Kumada catalyst-transfer polycondensation (KCTP). Furthermore, one tellura(benzo)bithiophene derivative exhibits orange-red phosphorescence at room temperature in air when incorporated into a poly(methyl methacrylate) host; accompanying TD-DFT computations provided insight into a potential mechanism for the observed phosphorescence.
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Affiliation(s)
- Christina A Braun
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr., Edmonton, Alberta T6G 2G2, Canada
| | - Michael J Ferguson
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr., Edmonton, Alberta T6G 2G2, Canada
| | - Eric Rivard
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr., Edmonton, Alberta T6G 2G2, Canada
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Zhao T, Wang P, Ji M, Li S, Yang M, Pu X. Post-Synthetic Modification Research of Salan Titanium bis-Chelates via Sonogashira Reaction. ACTA CHIMICA SINICA 2021. [DOI: 10.6023/a21060282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Iron(II) Spin Crossover Complex with the 1,2,3-Triazole-Containing Linear Pentadentate Schiff-Base Ligand and the MeCN Monodentate Ligand. CRYSTALS 2019. [DOI: 10.3390/cryst9060276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A mononuclear iron(II) complex bearing the linear pentadentate N5 Schiff-base ligand containing two 1,2,3-triazole moieties and the MeCN monodentate ligand, [FeIIMeCN(L3-Me-3Ph)](BPh4)2·MeCN·H2O (1), have been prepared (L3-Me-3Ph = bis(N,N′-1-Phenyl-1H-1,2,3-triazol-4-yl-methylideneaminopropyl)methylamine). Variable-temperature magnetic susceptibility measurements revealed an incomplete one-step spin crossover (SCO) from the room-temperature low-spin (LS, S = 0) state to a mixture of the LS and high-spin (HS, S = 2) species at the higher temperature of around 400 K upon first heating, which is irreversible on the consecutive cooling mode. The magnetic modulation at around 400 K was induced by the crystal-to-amorphous transformation accompanied by the loss of lattice MeCN solvent, which was evident from powder X-ray diffraction (PXRD) studies and themogravimetry. The single-crystal X-ray diffraction studies showed that the complex is in the LS state (S = 0) between 296 and 387 K. In the crystal lattice, the complex-cations and B(1)Ph4− ions are alternately connected by intermolecular CH···π interactions between the methyl group of the MeCN ligand and phenyl groups of B(1)Ph4− ions, forming a 1D chain structure. The 1D chains are further connected by P4AE (parallel fourfold aryl embrace) interactions between two neighboring complex-cations, constructing a 2D extended structure. B(2)Ph4− ions and MeCN lattice solvents exist in the spaces of the 2D layer. DFT calculations verified that the 1,2,3-triazole-containing ligand L3-Me-3Ph gives a stronger ligand field around the octahedral coordination environment of the iron(II) ion than the analogous imidazole-containing ligand H2L2Me (= bis(N,N′-2-methylimidazol-4-yl-methylideneaminopropyl)methylamine) of the known compound [FeIIMeCN(H2L2Me)](BPh4)1.5·Cl0.5·0.5MeCN (2) reported by Matsumoto et al. (Nishi, K.; Fujinami, T.; Kitabayashi, A.; Matsumoto, N. Tetrameric spin crossover iron(II) complex constructed by imidazole⋯chloride hydrogen bonds. Inorg. Chem. Commun. 2011, 14, 1073–1076), resulting in the much higher spin transition temperature of 1 than that of 2.
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Dey B, Roy S, Titiš J, Boča R, Bera SP, Mondal A, Konar S. Above Room Temperature Spin Transition in Thermally Stable Mononuclear Fe(III) Complexes. Inorg Chem 2019; 58:1134-1146. [DOI: 10.1021/acs.inorgchem.8b02405] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Bijoy Dey
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Subhadip Roy
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Ján Titiš
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, 917 01 Trnava, Slovakia
| | - Roman Boča
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, 917 01 Trnava, Slovakia
| | - Siba Prasad Bera
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Arpan Mondal
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Sanjit Konar
- Department of Chemistry, IISER Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
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Rao MLN, Murty VN. Rapid Access to Benzofuran-Based Natural Products through a Concise Synthetic Strategy. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600154] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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9
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Trobe M, Breinbauer R. Improved and scalable synthesis of building blocks for the modular synthesis of teraryl-based alpha-helix mimetics. MONATSHEFTE FUR CHEMIE 2015. [DOI: 10.1007/s00706-015-1599-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gildea B, Harris MM, Gavin LC, Murray CA, Ortin Y, Müller-Bunz H, Harding CJ, Lan Y, Powell AK, Morgan GG. Substituent Effects on Spin State in a Series of Mononuclear Manganese(III) Complexes with Hexadentate Schiff-Base Ligands. Inorg Chem 2014; 53:6022-33. [PMID: 24901836 DOI: 10.1021/ic5003012] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Brendan Gildea
- School
of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin, D4 Ireland
| | - Michelle M. Harris
- School
of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin, D4 Ireland
| | - Laurence C. Gavin
- School
of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin, D4 Ireland
| | - Caroline A. Murray
- School
of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin, D4 Ireland
| | - Yannick Ortin
- School
of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin, D4 Ireland
| | - Helge Müller-Bunz
- School
of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin, D4 Ireland
| | - Charles J. Harding
- Department
of Chemistry, The Open University, Walton Hall, Milton Keynes, MK7 6AA U.K
| | - Yanhua Lan
- Institut
für Anorganische Chemie, Universität Karlsruhe, Physikhochhaus
Wolfgang-Gaede-Str. 1, Karlsruhe, D-76128 Germany
| | - Annie K. Powell
- School
of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin, D4 Ireland
- Institut
für Anorganische Chemie, Universität Karlsruhe, Physikhochhaus
Wolfgang-Gaede-Str. 1, Karlsruhe, D-76128 Germany
| | - Grace G. Morgan
- School
of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin, D4 Ireland
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Fukuroi K, Takahashi K, Mochida T, Sakurai T, Ohta H, Yamamoto T, Einaga Y, Mori H. Synergistic Spin Transition between Spin Crossover and Spin-Peierls-like Singlet Formation in the Halogen-Bonded Molecular Hybrid System: [Fe(Iqsal)2][Ni(dmit)2]⋅CH3CN⋅H2O. Angew Chem Int Ed Engl 2014; 53:1983-6. [DOI: 10.1002/anie.201309865] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Indexed: 11/11/2022]
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12
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Fukuroi K, Takahashi K, Mochida T, Sakurai T, Ohta H, Yamamoto T, Einaga Y, Mori H. Synergistic Spin Transition between Spin Crossover and Spin-Peierls-like Singlet Formation in the Halogen-Bonded Molecular Hybrid System: [Fe(Iqsal)2][Ni(dmit)2]⋅CH3CN⋅H2O. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309865] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Yankey M, Obuah C, Guzei IA, Osei-Twum E, Hearne G, Darkwa J. (Phenoxyimidazolyl-salicylaldimine)iron complexes: synthesis, properties and iron catalysed ethylene reactions. Dalton Trans 2014; 43:13913-23. [DOI: 10.1039/c4dt01886a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
(Salicyladimine)iron(iii) pre-catalysts, from iron(ii) precursors, form catalysts for ethylene oligomerisation, polymerisation and alkylation of aromatic solvents by the ethylene oligomers.
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Affiliation(s)
- Margaret Yankey
- Department of Chemistry
- University of Johannesburg
- Auckland Park, South Africa
| | - Collins Obuah
- Department of Chemistry
- University of Johannesburg
- Auckland Park, South Africa
| | - Ilia A. Guzei
- Department of Chemistry
- University of Johannesburg
- Auckland Park, South Africa
- Department of Chemistry
- University of Wisconsin-Madison
| | | | - Giovanni Hearne
- Department of Physics
- University of Johannesburg
- Auckland Park, South Africa
| | - James Darkwa
- Department of Chemistry
- University of Johannesburg
- Auckland Park, South Africa
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Cook C, Habib F, Aharen T, Clérac R, Hu A, Murugesu M. High-temperature spin crossover behavior in a nitrogen-rich Fe(III)-based system. Inorg Chem 2013; 52:1825-31. [PMID: 23387958 DOI: 10.1021/ic301864d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A nitrogen-rich ligand bis(1H-tetrazol-5-yl)amine (H(3)bta) was employed to isolate a new Fe(III) complex, Na(2)NH(4)[Fe(III)(Hbta)(3)]·3DMF·2H(2)O (1). Single crystal X-ray diffraction revealed that complex 1 consists of Fe(III) ions in an octahedral environment where each metal ion is coordinated by three Hbta(2-) ligands forming the [Fe(III)(Hbta)(3)](3-) core. Each unit is linked to two one-dimensional (1-D) Na(+)/solvent chains creating a two-dimensional (2-D) network. In addition, the presence of multiple hydrogen bonds in all directions between ammonium cation and ligands of different [Fe(III)(Hbta)(3)](3-) units generates a three-dimensional (3-D) network. Magnetic measurements confirmed that the Fe(III) center undergoes a Spin Crossover (SCO) at high temperature (T(1/2) = 460(10) K).
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Affiliation(s)
- Cyril Cook
- Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
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Boilleau C, Suaud N, Guihéry N. Ab initio study of the influence of structural parameters on the potential energy surfaces of spin-crossover Fe(II) model compounds. J Chem Phys 2012; 137:224304. [DOI: 10.1063/1.4768870] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Corentin Boilleau
- Université de Toulouse, UPS, Laboratoire de Chimie et Physique Quantiques, IRSAMC, F-31062 Toulouse, France
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Djukic B, Jenkins HA, Seda T, Lemaire MT. Structural and magnetic properties of homoleptic iron(III) complexes containing N-(8-quinolyl)-salicylaldimine [Fe(Qsal)2]+X− {X = I or (Qsal)FeCl3}. TRANSIT METAL CHEM 2012. [DOI: 10.1007/s11243-012-9679-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Rezaei B, Hadadzadeh H, Azimi A. Fabrication of an optical sensor based on the immobilization of Qsal on the plasticized PVC membrane for the determination of copper(II). JOURNAL OF ANALYTICAL CHEMISTRY 2012. [DOI: 10.1134/s1061934812080060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Pandurangan K, Gildea B, Murray C, Harding CJ, Müller-Bunz H, Morgan GG. Lattice effects on the spin-crossover profile of a mononuclear manganese(III) cation. Chemistry 2012; 18:2021-9. [PMID: 22250048 DOI: 10.1002/chem.201102820] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Indexed: 11/06/2022]
Abstract
Six solvated salts of a mononuclear manganese(III) complex with a chelating hexadentate Schiff base ligand are reported. One member of the series, [MnL]PF(6)⋅0.5 CH(3)OH (1), shows a rare low-spin (LS) electronic configuration between 10-300 K. The remaining five salts, [MnL]NO(3)⋅C(2)H(5)OH(2), [MnL]BF(4)⋅C(2)H(5)OH(3), [MnL]CF(3)SO(3)⋅C(2)H(5)OH (4), [MnL]ClO(4)⋅C(2)H(5)OH (5) and [MnL]ClO(4)⋅0.5 CH(3)CN (6), all show gradual incomplete spin-crossover (SCO) behaviour. The structures of all were determined at 100 K, and also at 293 K in the case of 3-6. The LS salt [MnL]PF(6)⋅0.5 CH(3)OH is the only member of the series that does not exhibit strong hydrogen bonding. At 100 K two of the four SCO complexes (2 and 4) assemble into 1D hydrogen-bonded chains, which weaken or rupture on warming. The remaining SCO complexes 3, 5 and 6 do not form 1D hydrogen-bonded chains, but instead exhibit discrete hydrogen bonding between cation/counterion, cation/solvent or counterion/solvent and show no significant change on warming.
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Affiliation(s)
- Komala Pandurangan
- Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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Savard D, Cook C, Enright GD, Korobkov I, Burchell TJ, Murugesu M. Gradual spin crossover behaviour in a linear trinuclear FeII complex. CrystEngComm 2011. [DOI: 10.1039/c1ce05275f] [Citation(s) in RCA: 36] [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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