1
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Shatokhin SS, Tuskaev VA, Gagieva SC, Rybalkina EY, Pozdnyakov DI, Melnikova EK, Denisov GL, Zubkevich SV, Oganesyan ET. Synthesis, structural characterization, antioxidant and cytotoxic activity towards human cancer cell lines and computational studies of new Ni(II), Co(II) and Pd(II) complexes with 3-[bis(3,5-dimethylpyrazol-1-yl)methyl]chromen-4-one derivatives. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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2
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Keisers K, Hüppe HM, Iffland-Mühlhaus L, Hoffmann A, Göbel C, Apfel UP, Weber B, Herres-Pawlis S. Interplay of Spin Crossover and Coordination-Induced Spin State Switch for Iron Bis(pyrazolyl)methanes in Solution. Inorg Chem 2020; 59:15343-15354. [PMID: 33002361 DOI: 10.1021/acs.inorgchem.0c02306] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Bis(pyrazolyl)bipyridinylmethane iron(II) complexes show a versatile spin state switching behavior in different solvents. In the solid, the magnetic properties of the compounds have been characterized by X-ray diffraction, Mößbauer spectroscopy, and SQUID magnetometry and point toward a high spin state. For nitrilic solvents, the solvation of the complexes leads to a change of the coordination environment from {N5O} to {N6} and results in a temperature-dependent SCO behavior. Thermodynamic properties of this transformation are obtained via UV/vis spectroscopy, SQUID measurements, and the Evans NMR method. Moreover, a coordination-induced spin state switch (CISSS) to low spin is observed by using methanol as solvent, triggered through a rearrangement of the coordination sphere. The same behavior can be observed by changing the stoichiometry of the ligand-to-metal ratio in MeCN, where the process is reversible. This transformation is monitored via UV/vis spectroscopy, and the resulting new bis-meridional coordination motif, first described for bis(pyrazolyl)methanes, is characterized in the solid state via X-ray diffraction, Mößbauer spectroscopy, and SQUID measurements. The sophisticated correlation of these switchable properties in dependence on different types of solvents reveals that the influence of the solvent on the coordination environment and magnetic properties should not be underestimated. Furthermore, careful investigation is necessary to differentiate between a thermally-induced spin crossover and a coordination-induced spin state switch.
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Affiliation(s)
- Kristina Keisers
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
| | - Henrika M Hüppe
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
| | - Linda Iffland-Mühlhaus
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
| | - Christoph Göbel
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Ulf-Peter Apfel
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany.,Fraunhofer UMSICHT, Osterfelder Straße 3, 46047 Oberhausen, Germany
| | - Birgit Weber
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
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3
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Nguyen TAD, Veauthier JM, Angles-Tamayo GF, Chavez DE, Lapsheva E, Myers TW, Nelson TR, Schelter EJ. Correlating Mechanical Sensitivity with Spin Transition in the Explosive Spin Crossover Complex [Fe(Htrz)3]n[ClO4]2n. J Am Chem Soc 2020; 142:4842-4851. [DOI: 10.1021/jacs.9b13835] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | - Ekaterina Lapsheva
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | | | | | - Eric J. Schelter
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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4
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Gardinier JR, Meise KJ, Jahan F, Wang D, Lindeman SV. Selective Isomer Formation and Crystallization-Directed Magnetic Behavior in Nitrogen-Confused C-Scorpionate Complexes of Fe(O 3SCF 3) 2. Inorg Chem 2019; 58:8953-8968. [PMID: 31247826 DOI: 10.1021/acs.inorgchem.8b03454] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The complex [Fe(HL*)2](OTf)2, 1, where HL* = bis(3,5-dimethylpyrazol-1-yl)(3-1H-pyrazole)methane, was prepared in order to compare its magnetic properties with those of the analogous parent complex, [Fe(HL)2](OTf)2, that lacks methyl groups on pyrazolyl rings and that undergoes spin crossover (SCO) from the low spin (LS) to the high spin (HS) form above room temperature. It was anticipated that this new semibulky derivative should favor the HS state and undergo SCO at a lower temperature range. During this study, six crystalline forms of 1 were prepared by controlling the crystallization conditions. Thus, when reagents are combined in CH3CN, an equilibrium mixture of cis and trans isomers is established that favors the latter below 311 K. The trans isomer can be isolated exclusively as a mixture of solvates, LS trans-1·2CH3CN and HS trans-1·4CH3CN, by cooling CH3CN solutions to -20 °C with the former being favored at high concentrations and short crystallization times. Subsequently, vapor diffusion of Et2O into CH3CN solutions of pure trans-1·2CH3CN gives solvate-free HS trans-1. Subjecting trans-1·2CH3CN to vacuum at room temperature gives microcrystalline trans-1·CH3CN, identified by elemental analysis and its distinct powder X-ray diffraction pattern. If an isomeric mixture of 1 is subject to room-temperature vapor diffusion, then a crystalline mixture of HS isomers cis-1 and trans-1 is obtained. Finally, slowly cooling hot acetonitrile solutions of isomeric mixtures of 1 to room temperature gives large prisms of HS co-1, a species with both cis and trans isomers in the unit cell. The complexes trans-1, trans-1·CH3CN, cis-1, and co-1 undergo SCO below 250 K while trans-1·xCH3CN (x = 2, 4) solvates do not undergo SCO before desolvation.
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Affiliation(s)
- James R Gardinier
- Department of Chemistry , Marquette University , Milwaukee , Wisconsin 53201-1881 , United States
| | - Kristin J Meise
- Department of Chemistry , Marquette University , Milwaukee , Wisconsin 53201-1881 , United States
| | - Fathiya Jahan
- Department of Chemistry , Marquette University , Milwaukee , Wisconsin 53201-1881 , United States
| | - Denan Wang
- 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
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5
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Melekhova AA, Novikov AS, Dubovtsev AY, Zolotarev AA, Bokach NA. Tris(3,5-dimethylpyrazolyl)methane copper(I) complexes featuring one disubstituted cyanamide ligand. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.09.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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6
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Mahmoud AG, Martins LM, Guedes da Silva MFC, Pombeiro AJ. Copper complexes bearing C-scorpionate ligands: Synthesis, characterization and catalytic activity for azide-alkyne cycloaddition in aqueous medium. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.08.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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7
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Zubkevich SV, Gagieva SC, Tuskaev VA, Dorovatovskii PV, Khrustalev VN, Sizov AI, Bulychev BM. Synthesis and reactivity in ethylene oligomerization by heteroscorpionate dibromonickel(II) complexes. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.12.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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8
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Jana O, Mani G. New types of Cu and Ag clusters supported by the pyrrole-based NNN-pincer type ligand. NEW J CHEM 2017. [DOI: 10.1039/c7nj01009e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While the neutral ligand 2,5-bis(3,5-dimethylpyrazolylmethyl)pyrrole gives the dihalide ion bridged binuclear and coordination polymers, its anionic form affords a new type of tetranuclear ‘hourglass’ shaped copper(i) and triangular silver(i) clusters owing to its increased denticity.
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Affiliation(s)
- Oishi Jana
- Department of Chemistry
- Indian Institute of Technology – Kharagpur
- Kharagpur
- India
| | - Ganesan Mani
- Department of Chemistry
- Indian Institute of Technology – Kharagpur
- Kharagpur
- India
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9
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Augenstein T, Dorner F, Reiter K, Wagner HE, Garnier D, Klopper W, Breher F. A Boron-Fluorinated Tris(pyrazolyl)borate Ligand (F
Tp*) and Its Mono- and Dinuclear Copper Complexes [Cu(F
Tp*)2
] and [Cu2
(F
Tp*)2
]: Synthesis, Structures, and DFT Calculations. Chemistry 2016; 22:7935-43. [DOI: 10.1002/chem.201504545] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Timo Augenstein
- Institute of Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstr. 15 76131 Karlsruhe Germany
| | - Franziska Dorner
- Institute of Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstr. 15 76131 Karlsruhe Germany
| | - Kevin Reiter
- Institute of Physical Chemistry; Karlsruhe Institute of Technology (KIT); Fritz-Haber-Weg 2 76131 Karlsruhe Germany
| | - Hanna E. Wagner
- Institute of Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstr. 15 76131 Karlsruhe Germany
| | - Delphine Garnier
- Institute of Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstr. 15 76131 Karlsruhe Germany
| | - Wim Klopper
- Institute of Physical Chemistry; Karlsruhe Institute of Technology (KIT); Fritz-Haber-Weg 2 76131 Karlsruhe Germany
| | - Frank Breher
- Institute of Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstr. 15 76131 Karlsruhe Germany
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10
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Liang S, Chattopadhyay S, Petersen JL, Young VG, Jensen MP. Oxidative assembly of octahedral nickel(II)-tris(3,5-dimethylpyrazol-1-yl)methane (Tpm∗) complexes by reaction of Ni(COD)2 (COD=1,5-cyclooctadiene) with putative oxene and nitrene precursors. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.10.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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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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12
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Lavrenova LG, Strekalova AD, Virovets AV, Piryazev DA, Daletskii VA, Sheludyakova LA, Mikhailovskaya TF, Vasilevskii SF. Spin crossover in the coordination compounds of iron(II) with tris(3,5-dimethylpyrazol-1-yl)methane. RUSS J COORD CHEM+ 2012. [DOI: 10.1134/s1070328412070081] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Lavrenova LG, Virovets AV, Peresypkina EV, Strekalova AD, Piryazev DA, Daletsky VA, Sheludyakova LA, Vasilevsky SF. Spin-crossover in the complex of iron(II) nitrate with tris(3,5-dimethylpyrazol-1-yl)methane. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.11.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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14
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Long GJ, Grandjean F, Reger DL. Spin Crossover in Pyrazolylborate and Pyrazolylmethane Complexes. Top Curr Chem (Cham) 2012. [DOI: 10.1007/b13530] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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15
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Chanu OB, Kumar A, Ahmed A, Lal R. Synthesis and characterisation of heterometallic trinuclear copper(II) and zinc(II) complexes derived from bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2011.11.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Goodman MA, Nazarenko AY, Casavant BJ, Li Z, Brennessel WW, DeMarco MJ, Long G, Goodman MS. Tris(5-methylpyrazolyl)methane: Synthesis and Properties of Its Iron(II) Complex. Inorg Chem 2011; 51:1084-93. [DOI: 10.1021/ic2022038] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Margaret A. Goodman
- Department of Math and Natural
Sciences, D’Youville College, Buffalo,
New York 14201, United States
| | | | | | | | - William W. Brennessel
- Department of Chemistry, University of Rochester, Rochester, New York 14627,
United States
| | - Michael J. DeMarco
- Department
of Physics, SUNY at Buffalo, Buffalo, New
York 14260, United States
| | - Gen Long
- Department
of Physics, SUNY at Buffalo, Buffalo, New
York 14260, United States
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17
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Lytvynenko AS, Kolotilov SV, Cador O, Golhen S, Ouahab L, Pavlishchuk VV. Antiferromagnetic ordering in cobalt(ii) and nickel(ii) 1D coordination polymers with the dithioamide of 1,3-benzenedicarboxylic acid. NEW J CHEM 2011. [DOI: 10.1039/c1nj20173e] [Citation(s) in RCA: 11] [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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18
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Wanke R, Guedes da Silva MFC, Lancianesi S, Silva TFS, Martins LMDRS, Pettinari C, Pombeiro AJL. Synthesis and Coordination Chemistry of a New N4-Polydentate Class of Pyridyl-Functionalized Scorpionate Ligands: Complexes of FeII, ZnII, NiII, VIV, PdII and Use for Heterobimetallic Systems. Inorg Chem 2010; 49:7941-52. [DOI: 10.1021/ic100966u] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Riccardo Wanke
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049−001 Lisbon, Portugal
| | - M. Fátima C. Guedes da Silva
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049−001 Lisbon, Portugal
- Universidade Lusófona de Humanidades e Tecnologias, ULHT Lisbon, Campo Grande 376, 1749-024 Lisbon, Portugal
| | - Stefano Lancianesi
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049−001 Lisbon, Portugal
| | - Telma F. S. Silva
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049−001 Lisbon, Portugal
| | - Luísa M. D. R. S. Martins
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049−001 Lisbon, Portugal
- Departamento de Engenharia Química, ISEL, R. Conselheiro Emídio Navarro, 1950-062 Lisbon, Portugal
| | - Claudio Pettinari
- Dipartimento di Scienze Chimiche, Università degli Studi di Camerino, Via S. Agostino 1, 62032 Camerino MC, Italy
| | - Armando J. L. Pombeiro
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049−001 Lisbon, Portugal
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19
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Adach A, Daszkiewicz M, Barszcz B, Cieślak-Golonka M, Maciejewska G. Redox processes as a route for the formation of an unusual structure of the Co(II)/Zn(II) complex isolated from the system: [Co(0)/Zn(II)-1-hydroxymethyl-3,5-dimethylpyrazole]. INORG CHEM COMMUN 2010. [DOI: 10.1016/j.inoche.2009.12.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Adach A, Daszkiewicz M, Barszcz B. Synthesis, X-ray structure, and spectroscopic investigation of new Co(II)/Cd(II) complexes formed via the reaction of 1-hydroxymethyl-3,5-dimethylpyrazole and Co0, CdCl2, NH4I. Struct Chem 2009. [DOI: 10.1007/s11224-009-9538-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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21
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Reger DL, Elgin JD, Foley EA, Smith MD, Grandjean F, Long GJ. Structural, Magnetic, and Mössbauer Spectral Study of the Electronic Spin-State Transition in [Fe{HC(3-Mepz)2(5-Mepz)}2](BF4)2. Inorg Chem 2009; 48:9393-401. [DOI: 10.1021/ic901259e] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel L. Reger
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - J. Derek Elgin
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
- Department of Chemistry and Physics, Coastal Carolina University, Conway, South Carolina 29528
| | - Elizabeth A. Foley
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Mark D. Smith
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Fernande Grandjean
- Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium
| | - Gary J. Long
- Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010
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22
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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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23
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Desrochers PJ, Corken AL, Tarkka RM, Besel BM, Mangum EE, Linz TN. A Simple Route to Single-Scorpionate Nickel(II) Complexes with Minimum Steric Requirements. Inorg Chem 2009; 48:3535-41. [DOI: 10.1021/ic8015645] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
| | - Adam L. Corken
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035
| | - Richard M. Tarkka
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035
| | - Brian M. Besel
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035
| | - Erin E. Mangum
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035
| | - Tiffany N. Linz
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035
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24
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Reger DL, Little CA, Semeniuc RF, Smith MD. Synthesis and structural characterization of a mixed-ligand diiron(II) complex formed by a linked bitopic tris(pyrazolyl)methane ligand: {HC(3,5-Me2pz)3Fe[μ-p-C6H4(CH2OCH2C(pz)3)2]Fe(3,5-Me2pz)3CH}(BF4)4 (pz=pyrazolyl ring). Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.03.120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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25
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Harding DJ, Harding P, Plant SE. Tris(5-methyl-3-phenyl-1H-pyrazol-1-yl)methane. Acta Crystallogr Sect E Struct Rep Online 2008; 64:o896. [PMID: 21202379 PMCID: PMC2961107 DOI: 10.1107/s1600536808010866] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2008] [Accepted: 04/18/2008] [Indexed: 11/11/2022]
Abstract
The first crystal structure of a second-generation tris(pyrazolyl)methane, namely the title compound, C31H28N6, is reported. The molecule exhibits a helical conformation with an average twist of 35.1°. In addition, there are C—H⋯π interactions of 3.202 (2) Å between the pyrazole C—H group and neighbouring phenyl groups.
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26
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Reger DL, Semeniuc RF, Smith MD. Supramolecular networks of silver(i) and iron(ii) complexes of the third generation tris(pyrazolyl)methane ligand Ph2(O)POCH2C(pz)3 (pz = pyrazolyl ring). Dalton Trans 2008:2253-60. [DOI: 10.1039/b719023a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Foltz C, Stecker B, Marconi G, Bellemin-Laponnaz S, Wadepohl H, Gade L. Stereochemical Consequences of Threefold Symmetry in Asymmetric Catalysis: Distorting C3 Chiral 1,1,1-Tris(oxazolinyl)ethanes (“Trisox”) in CuII Lewis Acid Catalysts. Chemistry 2007; 13:9912-23. [DOI: 10.1002/chem.200701085] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Halcrow MA. The spin-states and spin-transitions of mononuclear iron(II) complexes of nitrogen-donor ligands. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.03.033] [Citation(s) in RCA: 270] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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29
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Grunert CM, Goodwin HA, Carbonera C, Létard JF, Kusz J, Gütlich P. Unusual Spin Transition Behavior in 2,6-Bis((pyrazol-3-yl)-pyridine) Iron(II)-bis-oxalato-platinate(II). J Phys Chem B 2007; 111:6738-47. [PMID: 17439168 DOI: 10.1021/jp068774a] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[Fe(bpp)2][Pt(ox)2].H2O (with bpp=2,6-bis(pyrazol-3-yl)-pyridine and ox=oxalate) was prepared, and its spin crossover behavior was characterized. The two-step spin transition behavior changes over several cycles. The original behavior is restored when the sample is allowed to relax for a week. Furthermore, the ST exhibits a strong dependence on the heating and cooling rate. Heating the compound at 1 K/min leads to a spin transition with a third step and a second plateau at gammaHS approximately 0.8. Quenching the sample to 77 K also affects the spin transition behavior. The kinetic relaxation is followed after quenching and after light-induced excited spin state trapping experiments.
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Affiliation(s)
- C Matthias Grunert
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Staudingerweg 9, D-55099 Mainz, Germany
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Moubaraki B, Leita BA, Halder GJ, Batten SR, Jensen P, Smith JP, Cashion JD, Kepert CJ, Létard JF, Murray KS. Structure, magnetism and photomagnetism of mixed-ligand tris(pyrazolyl)methane iron(ii) spin crossover compounds. Dalton Trans 2007:4413-26. [PMID: 17909653 DOI: 10.1039/b708773j] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A range of bis-facial tridentate chelate complexes of type [Fe((R-pz)(3)CH)((3,5-Me(2)pz)(3)CH)](BF(4))(2) has been characterised that contain two different tris-pyrazolylmethane ligands, with variations in R being H (complex crystallised as polymorphs and ) and 4-Me (), as well as R = H with a CH(2)OH arm off the methane carbon (). A tris(pyridyl)methane analogue is also described (). The tris(3,5-dimethylpyrazolyl)methane co-ligand (3,5-Me(2)pz), and the BF(4)(-) counterion, are constant throughout. The spin-crossover properties of these Fe(ii) d(6) compounds have been probed in detail by variable temperature magnetic, Mössbauer spectral and crystallographic methods. The effects of distortions from octahedral symmetry around the Fe(ii) centres, of crystal solvate molecules (1.5 MeCN in and 2 MeCN in ) and of supramolecular/crystal packing, are discussed. In the case of , subtle twisting of pyrazole rings occurs, as a function of temperature, that has a greater effect upon the relative positions of the Fe(ii) chelate molecules in polymorph than in polymorph ; this is thought to drive the cooperativity differences observed in the magnetism of the polymorphs. Comparisons are also made between to and their homoleptic, parent [Fe(L)(2)] (2+) materials. The complexes were screened for the LIESST (light induced excited spin state trapping) effect by measurements of diffuse absorption spectra on the surface of powder samples, at different temperatures. One example, , showed a 2-step thermal spin crossover transition and it was probed in detail for its photomagnetic features. The T(LIESST) and T(1/2) values for did not obey an empirical relationship, T(LIESST) = 150 - 0.3T(1/2) followed by many Fe(ii)(N-donor)(6) crossover compounds of the bis-tridentate (meridional) type, and possible reasons for this are discussed.
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Affiliation(s)
- Boujemaa Moubaraki
- School of Chemistry, Building 23, Monash University, Clayton, Victoria 3800, Australia
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Reger DL, Elgin JD, Smith MD, Grandjean F, Rebbouh L, Long GJ. Structural identification of the factors that prevent an electronic spin-state crossover in Fe[(C6H5)B(3-Mepz)3]2 (pz=pyrazolyl ring). Polyhedron 2006. [DOI: 10.1016/j.poly.2006.03.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Reger DL, Gardinier JR, Elgin JD, Smith MD, Hautot D, Long GJ, Grandjean F. Structure−Function Correlations in Iron(II) Tris(pyrazolyl)borate Spin-State Crossover Complexes. Inorg Chem 2006; 45:8862-75. [PMID: 17054344 DOI: 10.1021/ic0607437] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Iron(II) poly(pyrazolyl)borate complexes have been investigated to determine the impact of substituent effects, intramolecular ligand distortions, and intermolecular supramolecular structures on the spin-state crossover (SCO) behavior. The molecular structure of Fe[HB(3,4,5-Me3pz)3]2 (pz = pyrazolyl ring), a complex known to remain high spin when the temperature is lowered, reveals that this complex has an intramolecular ring-twist distortion that is not observed in analogous complexes that do exhibit a SCO at low temperatures, thus indicating that this distortion greatly influences the properties of these complexes. The structure of Fe[B(3-(cy)Prpz)4]2.(CH3OH) ((cy)Pr = cyclopropyl ring) at 294 K has two independent molecules in the unit cell, both of which are high spin; only one of these high-spin iron(II) sites, the site with the lesser ring-twist distortion, is observed to be low-spin iron(II) in the 90 K structure. A careful evaluation of the supramolecular structures of these complexes and several similar complexes reported previously revealed no strong correlation between the supramolecular packing forces and their SCO behavior. Magnetic and Mössbauer spectral measurements on Fe[B(3-(cy)Prpz)4]2 and Fe[HB(3-(cy)Prpz)3]2 indicate that both complexes exhibit a partial SCO from fully high-spin iron(II) at higher temperatures, respectively, to a 50:50 high-spin/low-spin mixture of iron(II) below 100 K. These results may be understood, in the former case, by the differences in ring-twisting and, in the latter case, by a phase transition; in all complexes in which a phase transition is observed, this change dominates the SCO behavior. A comparison of the Mössbauer spectral properties of these two complexes and of Fe[HB(3-Mepz)3]2 with that of other complexes reveals correlations between the Mössbauer-effect isomer shift and the average Fe-N bond distance and between the quadrupole splitting and the average FeN-NB intraligand dihedral torsion angles and the distortion of the average N-Fe-N intraligand bond angles.
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Affiliation(s)
- Daniel L Reger
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
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Michaud A, Fontaine FG, Zargarian D. Synthesis and structural characterization of bis- and tris(3,5-dimethylpyrazolyl)methane complexes of Ni(NO3)2. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2005.09.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Reger DL, Gardinier JR, Smith MD, Shahin AM, Long GJ, Rebbouh L, Grandjean F. Polymorphism in Fe[(p-IC6H4)B(3-Mepz)3]2 (pz = Pyrazolyl): Impact of Supramolecular Structure on an Iron(II) Electronic Spin-State Crossover. Inorg Chem 2005; 44:1852-66. [PMID: 15762712 DOI: 10.1021/ic048406q] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The new ligands Na[(p-IC6H4)B(3-Rpz)3] (R = H, Me) have been prepared by converting I2C6H4 to IC6H4SiMe3 with Li(t)Bu and SiMe3Cl, and then to IC6H4BBr2 with BBr3 and subsequent reaction with 3 equiv of (un)substituted pyrazole and 1 equiv of NaO(t)Bu. These new ligands react with FeBr2 to give either purple, low-spin Fe[(p-IC6H4)B(pz)3]2 or colorless, high-spin Fe[(p-IC6H4)B(3-Mepz)3]2. Depending upon the crystallization conditions, Fe[(p-IC6H4)B(3-Mepz)3]2 can exist both as two polymorphs and as a methylene chloride solvate. An examination of these polymorphs by variable-temperature X-ray crystallography, magnetic susceptibility, and Mossbauer spectroscopy has revealed different electronic spin-state crossover properties for each polymorph and yields insight into the influence of crystal packing, independent of other electronic perturbations, on the spin-state crossover. The first polymorph of Fe[(p-IC6H4)B(3-Mepz)3]2 has a highly organized three-dimensional supramolecular structure and does not undergo a spin-state crossover upon cooling to 4 K. The second polymorph of Fe[(p-IC6H4)B(3-Mepz)3]2 has a stacked two-dimensional supramolecular structure, a structure that is clearly less well organized than that of the first polymorph, and undergoes an abrupt iron(II) spin-state crossover from high spin to low spin upon cooling below ca. 130 K. The crystal structure of the methylene chloride solvate of Fe[(p-IC6H4)B(3-Mepz)3]2 has a similar stacked two-dimensional supramolecular structure, but the crystals readily lose the solvate. The resulting desolvate undergoes a gradual spin-state crossover to the low-spin state upon cooling below ca. 235 K. It is clear from a comparison of the structures that the long-range solid-state organization of the molecules, which is controlled by noncovalent supramolecular interactions, has a strong impact upon the spin-state crossover, with the more highly organized structures having lower spin-crossover temperatures and more abrupt spin-crossover behavior.
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Affiliation(s)
- Daniel L Reger
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
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Reger DL, Gardinier JR, Gemmill WR, Smith MD, Shahin AM, Long GJ, Rebbouh L, Grandjean F. Formation of Third Generation Poly(pyrazolyl)borate Ligands from Alkyne Coupling Reactions of Fe[(p-IC6H4)B(3-Rpz)3]2 (R = H, Me; pz = Pyrazolyl): Pathways toward Controlling an Iron(II) Electronic Spin-State Crossover. J Am Chem Soc 2005; 127:2303-16. [PMID: 15713110 DOI: 10.1021/ja044900h] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sonogashira coupling reactions of terminal alkynes with Fe[(p-IC6H4)B(3-Mepz)3]2 (pz = pyrazolyl ring) yield Fe[(p-PhC2C6H4)B(3-Mepz)3]2 (2), Fe[(p-Me3SiC2C6H4)B(3-Rpz)3]2 (R = H, 3a, R = Me, 3b), and Fe[(p-HC2C6H4)B(3-Mepz)3]2 (R = H, 4a, R = Me, 4b), a series of new complexes containing "third generation" poly(pyrazolyl)borate ligands. Complex 2 undergoes a fairly gradual iron(II) electronic spin-state crossover with a 30 K hysteresis, whereas complex 3b is an unusual example of a complex with equivalent iron(II) sites in the high-spin form that shows an abrupt 50% spin crossover. For complex 4b, 50% of the iron(II) sites undergo a gradual spin-state transition between 185 and 350 K with an activation energy of 1590 +/- 30 cm(-1) and a T(1/2) = 280 K and, for the remaining iron(II) sites, an abrupt cooperative spin-state crossover between 106 and 114 K. The crystal structures of 4b obtained for each of the three distinct electronic spin states reveal two crystallographically different iron(II) sites, and analysis of the molecular/supramolecular structures indicates that the difference in the degree of pyrazolyl ring tilting in the ligands between the two sites, rather than the strength of the intermolecular forces, play a prominent role in determining the temperature of the spin-state crossover.
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Affiliation(s)
- Daniel L Reger
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
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Bigmore HR, Lawrence SC, Mountford P, Tredget CS. Coordination, organometallic and related chemistry of tris(pyrazolyl)methane ligands. Dalton Trans 2005:635-51. [PMID: 15702171 DOI: 10.1039/b413121e] [Citation(s) in RCA: 229] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tris(pyrazolyl)methanes are the neutral analogues of the widely exploited and highly useful tris(pyrazolyl)hydroborates, yet by comparison with their boron based counterparts their chemistry is underdeveloped. Recent breakthroughs in the synthesis of ring-substituted tris(pyrazolyl)methanes offer the opportunity for the development of this useful and promising class of ligand. This review summarises the current state of the coordination and organometallic chemistry of tris(pyrazolyl)methanes and highlights areas in which development is likely to occur.
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Affiliation(s)
- Helen R Bigmore
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK
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Foltz C, Stecker B, Marconi G, Bellemin-Laponnaz S, Wadepohl H, Gade LH. Exploiting C3-symmetry in the dynamic coordination of a chiral trisoxazoline to copper(ii): improved enantioselectivity, and catalyst stability in asymmetric lewis acid catalysis. Chem Commun (Camb) 2005:5115-7. [PMID: 16220189 DOI: 10.1039/b509571a] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral C3-symmetric trisoxazolines are highly efficient stereodirecting ligands in enantioselective Cu(II) Lewis acid catalysis which is based on the concept of a stereoelectronic hemilability of the divalent copper; in direct comparison with the analogous bisoxazoline systems they are more efficient in the enantioselective alpha-amination as well as the enantioselective Mannich reaction of prochiral beta-ketoesters.
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Affiliation(s)
- Carole Foltz
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
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Zibaseresht R, Hartshorn RM. Coordination chemistry of a terpyridine-tris(pyrazolyl) ditopic ligand. Dalton Trans 2005:3898-908. [PMID: 16311644 DOI: 10.1039/b509324d] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new ditopic ligand, 4'-(4-(2,2,2-tris(1H-pyrazol-1-ido)ethoxymethyl)phenyl)-2,2':6',2''-terpyridine (pzt), has been prepared and its coordination chemistry studied. Metal ions with a preference for octahedral geometry form ML(2) complexes that are readily isolated and characterised, with the metal ion being bound to the terpyridine sites of both ligands. Other metal ions bind to the terpyridine site of just one ligand. In the case of silver(i), a dinuclear M(2)L(2) complex has been isolated in which each silver ion is coordinated to the terpyridine site of one ligand and to a single pyrazolyl donor group from the second ligand. Evidence for binding of metal ions to the tris(pyrazolyl) binding site was obtained by electrospray mass spectrometry and NMR techniques. The free ligand and three metal complexes, including the disilver complex, have been characterised by X-ray crystallographic techniques.
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Affiliation(s)
- Ramin Zibaseresht
- Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
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Reger D, Elgin J, Smith M, Grandjean F, Rebbouh L, Long G. A Study of the Electronic Spin-State Crossover in {Fe[HC(3,4,5-Me3pz)3]2}(BF4)2. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300973] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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41
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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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Reger D, Semeniuc R, Smith M. Influence of the Crystallization Solvent on Molecular and Supramolecular Structures of Silver(I) Tris(3-Phenylpyrazolyl)methane Complexes. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200300141] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Elhaïk J, Money VA, Barrett SA, Kilner CA, Evans IR, Halcrow MA. The spin-states and spin-crossover behaviour of iron(ii) complexes of 2,6-dipyrazol-1-ylpyrazine derivatives. Dalton Trans 2003. [DOI: 10.1039/b210368k] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nakano M, Matsubayashi GE, Matsuo T. Dynamic Jahn–Teller Character of Manganese(III) Spin-Crossover Complex [Mn(taa)] (H3taa=tris(1-(2-azolyl)-2-azabuten-4-yl)amine). ADVANCES IN QUANTUM CHEMISTRY 2003. [DOI: 10.1016/s0065-3276(03)44041-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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