1
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Kulmaczewski R, Halcrow MA. Iron(II) complexes of 2,6-bis(imidazo[1,2- a]pyridin-2-yl)pyridine and related ligands with annelated distal heterocyclic donors. Dalton Trans 2023; 52:14928-14940. [PMID: 37799008 DOI: 10.1039/d3dt02747c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
Following a published synthesis of 2,6-bis(imidazo[1,2-a]pyridin-2-yl)pyridine (L1), treatment of α,α'-dibromo-2,6-diacetylpyridine with 2 equiv. 2-aminopyrimidine or 2-aminoquinoline in refluxing acetonitrile respectively gives 2,6-bis(imidazo[1,2-a]pyrimidin-2-yl)pyridine (L2) and 2,6-bis(imidazo[1,2-a]quinolin-2-yl)pyridine (L3). Solvated crystals of [Fe(L1)2][BF4]2 (1[BF4]2) and [Fe(L2)2][BF4]2 (2[BF4]2) are mostly high-spin, although one solvate of 1[BF4]2 undergoes thermal spin-crossover on cooling. The iron coordination geometry is consistently distorted in crystals of 2[BF4]2 which may reflect the influence of intramolecular, inter-ligand N⋯π interactions on the molecular conformation. Only 1 : 1 Fe : L3 complexes were observed in solution, or isolated in the solid state; a crystal structure of [FeBr(py)2L3]Br·0.5H2O (py = pyridine) is presented. A solvate crystal structure of high-spin [Fe(L4)2][BF4]2 (L4 = 2,6-di{quinolin-2-yl}pyridine; 4[BF4]2) is also described, which exhibits a highly distorted six-coordinate geometry with a helical ligand conformation. The iron(II) complexes are high-spin in solution at room temperature, but 1[BF4]2 and 2[BF4]2 undergo thermal spin-crossover equilibria on cooling. All the compounds exhibit a ligand-based emission in solution at room temperature. Gas phase DFT calculations mostly reproduce the spin state properties of the complexes, but show small anomalies attributed to intramolecular, inter-ligand dispersion interactions in the sterically crowded molecules.
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Affiliation(s)
- Rafal Kulmaczewski
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
| | - Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
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2
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Gajecki L, Sawicka B, Berg DJ, Oliver AG. Synthesis and Magnetic Studies of Two Neutral, Bis-Ligand Fe(II) Complexes Containing Carbazole- Bis(tetrazole) Ligands. Inorg Chem 2023. [PMID: 37478316 DOI: 10.1021/acs.inorgchem.3c01167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
Previously reported carbazole-bis(tetrazole) (CzTR) ligands (where R = iPr and CH2-2,4,6-C6H2Me3) were used to synthesize air-stable, six-coordinate, octahedral bis-ligand Fe(II) complexes (CzTR)2Fe. The synthesis and characterization of these complexes using 1H nuclear magnetic resonance (NMR), X-ray crystallography, Mössbauer spectroscopy, and density functional theory (DFT) calculations are reported. Analysis of the magnetic properties revealed that the isopropyl derivative displays thermally induced spin crossover (SCO) over a temperature range of 150-350 K. This transition appears as an abrupt two-step transition in the solid state but simplifies to a smooth one-step transition in solution. The two-step transition in the solid state has been postulated to be due to lattice and solvation effects. In contrast, the slightly bulkier substituted CH2-2,4,6-C6H2Me3 (CH2Mes) Fe complex displays dramatically different magnetic behavior with no SCO and magnetic data suggesting low-spin Fe(II) with a possible TIP contribution. DFT calculations support the postulate that the change in magnetic behavior is primarily due to the nature of the ligand substituents.
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Affiliation(s)
- Leah Gajecki
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3V6
| | - Barbara Sawicka
- Department of Mechanical Engineering, University of Victoria, P.O. Box 1700 STN CSC, Victoria, British Columbia, Canada V8W 2Y2
| | - David J Berg
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3V6
| | - Allen G Oliver
- Department of Chemistry & Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
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3
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Desrochers PJ, Abdulrahim A, Demaree KR, Fortner JA, Freeman JD, Provorse Long M, Martin ME, Gómez-García CJ, Gerasimchuk N. Rational Design of Iron Spin-Crossover Complexes Using Heteroscorpionate Chelates. Inorg Chem 2022; 61:18907-18922. [DOI: 10.1021/acs.inorgchem.2c02856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Patrick J. Desrochers
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Ali Abdulrahim
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Katherine R. Demaree
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Joseph A. Fortner
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Jamie D. Freeman
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Makenzie Provorse Long
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Madison E. Martin
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Carlos J. Gómez-García
- Departamento de Química Inorgánica, Universidad de Valencia, C/Dr. Moliner, 50. 46100Burjassot, Valencia, Spain
| | - Nikolay Gerasimchuk
- Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, Missouri65897, United States
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4
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Ekanayaka TK, Kurz H, McElveen KA, Hao G, Mishra E, N'Diaye AT, Lai RY, Weber B, Dowben PA. Evidence for surface effects on the intermolecular interactions in Fe(II) spin crossover coordination polymers. Phys Chem Chem Phys 2022; 24:883-894. [PMID: 34908055 DOI: 10.1039/d1cp04243b] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS), it is evident that the spin state transition behavior of Fe(II) spin crossover coordination polymer crystallites at the surface differs from the bulk. A comparison of four different coordination polymers reveals that the observed surface properties may differ from bulk for a variety of reasons. There are Fe(II) spin crossover coordination polymers with either almost complete switching of the spin state at the surface or no switching at all. Oxidation, differences in surface packing, and changes in coordination could all contribute to making the surface very different from the bulk. Some Fe(II) spin crossover coordination polymers may be sufficiently photoactive so that X-ray spectroscopies cannot discern the spin state transition.
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Affiliation(s)
- Thilini K Ekanayaka
- Department of Physics and Astronomy, University of Nebraska, Jorgensen Hall, Lincoln, NE 68588-0299, USA.
| | - Hannah Kurz
- Inorganic Chemistry IV, University of Bayreuth, Universitätsstrasse 30, NW I, 95447 Bayreuth, Germany
| | - Kayleigh A McElveen
- Department of Chemistry, University of Nebraska, Hamilton Hall, Lincoln, NE 68588, USA
| | - Guanhua Hao
- Department of Physics and Astronomy, University of Nebraska, Jorgensen Hall, Lincoln, NE 68588-0299, USA. .,Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Esha Mishra
- Department of Physics and Astronomy, University of Nebraska, Jorgensen Hall, Lincoln, NE 68588-0299, USA.
| | - Alpha T N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska, Hamilton Hall, Lincoln, NE 68588, USA.,Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Voetle-Keegan Nano Center, Lincoln, NE 68588, USA
| | - Birgit Weber
- Inorganic Chemistry IV, University of Bayreuth, Universitätsstrasse 30, NW I, 95447 Bayreuth, Germany
| | - Peter A Dowben
- Department of Physics and Astronomy, University of Nebraska, Jorgensen Hall, Lincoln, NE 68588-0299, USA.
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5
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Shahid N, Burrows KE, Pask CM, Cespedes O, Howard MJ, McGowan PC, Halcrow MA. Heteroleptic iron( ii) complexes of chiral 2,6-bis(oxazolin-2-yl)-pyridine (PyBox) and 2,6-bis(thiazolin-2-yl)pyridine ligands – the interplay of two different ligands on the metal ion spin sate. Dalton Trans 2022; 51:4262-4274. [DOI: 10.1039/d2dt00393g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The spin-crossover properties of [Fe(LR)L][ClO4]2 (LR = a chiral PyBox {L1R} or ThioPyBox {L2R} derivative) show subtle differences depending on the tridentate ‘L’ co-ligand.
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Affiliation(s)
- Namrah Shahid
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT
| | - Kay E. Burrows
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT
| | | | - Oscar Cespedes
- School of Physics and Astronomy, University of Leeds, WH Bragg Building, Leeds, UK LS2 9JT
| | - Mark J. Howard
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT
| | - Patrick C. McGowan
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT
| | - Malcolm A. Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT
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6
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Ma C, Besson C. Precise control of the degree and regioselectivity of functionalization in nitro- and amino-functionalized di(trispyrazolylborato)iron(II) spin crossover complexes. Dalton Trans 2021; 50:18077-18088. [PMID: 34846411 DOI: 10.1039/d1dt03445f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Di(trispyrazolylborato)iron(II) ([Tp2Fe]) complexes represent one of the most robust classes of spin-crossover complexes. Their stability renders them particularly suitable for integration in nanoscale devices, e.g. as sensors or information storage units. While prior studies of the functionalization of those derivatives have been focused on the electronic and steric effects of alkyl and -CF3 groups in position 3, a pyrazole exchange reaction between nitropyrazole and either trispyrazolylborate or its iron complex allows the regioselective installation of nitro substituents in positions 3, 4 and 5 of the [Tp2Fe] complexes. The degree of substitution can be varied from 1 to 4 functionalized pyrazoles per complex. The amine-functionalized analogues are accessed by reduction of the nitro analogues under hydrogen transfer conditions. With the exception of di- and tetra-3-NO2 substituted complexes, all derivatives display spin crossover properties in the solid state, with transition temperatures ranging from 180 to 380 K and showing different degrees of abruptness but no hysteresis. The Slichter-Drickamer model was used to extract the empirical thermodynamic transition parameters, allowing a systematic investigation of the influence of stoichiometry, position, and electronic nature of the substitution on the magnetic properties of the complexes. The steric effects dominate for substitution in position 3 but the electronic effects are significant for the other positions.
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Affiliation(s)
- Chenyang Ma
- Department of Chemistry, The George Washington University, 800 22nd Street NW, Washington, D.C. 20052, USA.
| | - Claire Besson
- Department of Chemistry, The George Washington University, 800 22nd Street NW, Washington, D.C. 20052, USA.
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7
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Pyykkönen A, Feher R, Köhler FH, Vaara J. Paramagnetic Pyrazolylborate Complexes Tp 2M and Tp* 2M: 1H, 13C, 11B, and 14N NMR Spectra and First-Principles Studies of Chemical Shifts. Inorg Chem 2020; 59:9294-9307. [PMID: 32558559 DOI: 10.1021/acs.inorgchem.0c01176] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The paramagnetic pyrazolylborates Tp2M and Tp*2M (M = Cu, Ni, Co, Fe, Mn, Cr, V) as well as [Tp2M]+ and [Tp*2M]+ (M = Fe, Cr, V) have been synthesized and their NMR spectra recorded. The 1H signal shift ranges vary from ∼30 ppm (Cu(II) and V(III)) to ∼220 ppm (Co(II)), and the 13C signal shift ranges from ∼180 ppm (Fe(III)) to ∼1150 ppm (Cr(II)). The 11B and 14N shifts are ∼360 and ∼730 ppm, respectively. Both negative and positive shifts have been observed for all nuclei. The narrow NMR signals of the Co(II), Fe(II), Fe(III), and V(III) derivatives provide resolved 13C,1H couplings. All chemical shifts have been calculated from first-principles on a modern version of Kurland-McGarvey theory which includes optimized structures, zero-field splitting, and g tensors, as well as signal shift contributions. Temperature dependence in the Fe(II) spin-crossover complex results from the equilibrium of the ground singlet and the excited quintet. We illustrate both the assignment and analysis capabilities, as well as the shortcomings of the current computational methodology.
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Affiliation(s)
- Ari Pyykkönen
- NMR Research Unit, University of Oulu, P.O. Box 3000, Oulu FI-90014, Finland
| | - Robert Feher
- Department Chemie, Technische Universität München, D-85748 Garching, Germany
| | - Frank H Köhler
- Department Chemie, Technische Universität München, D-85748 Garching, Germany
| | - Juha Vaara
- NMR Research Unit, University of Oulu, P.O. Box 3000, Oulu FI-90014, Finland
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8
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Boniolo M, Shylin SI, Chernev P, Cheah MH, Heizmann PA, Huang P, Salhi N, Hossain K, Thapper A, Lundberg M, Messinger J. Spin transition in a ferrous chloride complex supported by a pentapyridine ligand. Chem Commun (Camb) 2020; 56:2703-2706. [PMID: 32057045 DOI: 10.1039/c9cc09630b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ferrous chloride complexes [FeIILxCl] commonly attain a high-spin state independently of the supporting ligand(s) and temperature. Herein, we present the first report of a complete spin crossover with T1/2 = 80 K in [FeII(Py5OH)Cl]+ (Py5OH = pyridine-2,6-diylbis[di(pyridin-2-yl)methanol]). Both spin forms of the complex are analyzed by X-ray spectroscopy and DFT calculations.
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Affiliation(s)
- Manuel Boniolo
- Department of Chemistry -Ångström Laboratory, Uppsala University, PO Box 523, 75120 Uppsala, Sweden.
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9
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Ossinger S, Näther C, Buchholz A, Schmidtmann M, Mangelsen S, Beckhaus R, Plass W, Tuczek F. Spin Transition of an Iron(II) Organoborate Complex in Different Polymorphs and in Vacuum-Deposited Thin Films: Influence of Cooperativity. Inorg Chem 2020; 59:7966-7979. [PMID: 32036663 DOI: 10.1021/acs.inorgchem.9b03354] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Two polymorphic modifications (1-I and 1-II) of the new spin crossover (SCO) complex [Fe{H2B(pz)(pypz)}2] (pz = pyrazole, pypz = pyridylpyrazole; 1) were prepared and investigated by differential scanning calorimetry (DSC), magnetic measurements, Mößbauer, vibrational, and absorption spectroscopy as well as single-crystal and X-ray powder diffraction. DSC measurements reveal that upon heating the thermodynamically metastable form 1-II to ∼178 °C it transforms into 1-I in an exothermic reaction, which proves that these modifications are related by monotropism. Both forms show thermal SCO with T1/2 values of 390 K (1-II) and 270 K (1-I). An analysis of the crystal structures of 1-II and the corresponding Zn(II) (2) and Co(II) (3) complexes that are isotypic with 1-I reveals that form II consists of dimers coupled by strong intramolecular π···π interactions, which is not the case for 1-I. In agreement with these findings, investigations of thin films of 1, where significant π···π interactions should be absent, reveal SCO behavior similar to that of 1-I. These results underscore the importance of cooperativity for the spin-transition behavior of this class of complexes.
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Affiliation(s)
- Sascha Ossinger
- Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str.2, 24118 Kiel, Germany
| | - Christian Näther
- Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str.2, 24118 Kiel, Germany
| | - Axel Buchholz
- Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-University, 07743 Jena, Germany
| | - Marc Schmidtmann
- Institute for Chemistry, Carl von Ossietzky University Oldenburg, 26111 Oldenburg, Germany
| | - Sebastian Mangelsen
- Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str.2, 24118 Kiel, Germany
| | - Rüdiger Beckhaus
- Institute for Chemistry, Carl von Ossietzky University Oldenburg, 26111 Oldenburg, Germany
| | - Winfried Plass
- Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-University, 07743 Jena, Germany
| | - Felix Tuczek
- Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str.2, 24118 Kiel, Germany
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10
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Seredyuk M, Znovjyak K, Fritsky IO, Sliva TY, Slobodyanik MS. Crystal structure and magnetic properties of bis-[butyl-tris-(1 H-pyrazol-1-yl)borato]iron(II). Acta Crystallogr E Crystallogr Commun 2019; 75:1327-1330. [PMID: 31523459 PMCID: PMC6727041 DOI: 10.1107/s2056989019011137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 08/09/2019] [Indexed: 11/16/2022]
Abstract
The asymmetric unit of the title compound, [Fe(C13H18BN6)2], contains two half independent complex mol-ecules. In each complex, the FeII atom is located on an inversion center and is surrounded by two scorpionate ligand butyl-tris-(1H-pyrazol-1-yl)borate mol-ecules that coordinate to the iron(II) ion through the N atoms of the pyrazole groups. The two independent complex mol-ecules differ essentially in the conformation of the butyl substituents. In the crystal, the complex mol-ecules are linked by a series of C-H⋯π inter-actions, which generate a supra-molecular three-dimensional structure. At 120 K, the average Fe-N bond distance is 1.969 Å, indicating the low-spin state of the iron(II) atom, which does not change upon heating, as demonstrated by high-temperature magnetic susceptibility measurements.
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Affiliation(s)
- Maksym Seredyuk
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Kateryna Znovjyak
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
- UkrOrgSyntez Ltd, Chervonotkatska Street 67, Kyiv 02094, Ukraine
| | - Igor O. Fritsky
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
- UkrOrgSyntez Ltd, Chervonotkatska Street 67, Kyiv 02094, Ukraine
| | - Tatiana Y. Sliva
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Mykola S. Slobodyanik
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
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11
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Kokovkin VV, Mironov IV, Korotaev EV, Shayapov VR, Shakirova OG, Lavrenova LG. Studies on Sulfate Iron(II) Complex With Tris(pyrazol‐1‐yl)methane Exhibiting Spin Crossover in Aqueous Solutions. ChemistrySelect 2019. [DOI: 10.1002/slct.201901424] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Vasily V. Kokovkin
- Nikolaev Institute of Inorganic Chemistry SB RAS 3 Lavrentiev Avenue, Novosibirsk 630090 Russia
- Analytical Chemistry DepartmentFaculty of Natural SciencesNovosibirsk National Research State University 2 Pirogova Str., Novosibirsk 630090 Russia
| | - Igor V. Mironov
- Nikolaev Institute of Inorganic Chemistry SB RAS 3 Lavrentiev Avenue, Novosibirsk 630090 Russia
- Analytical Chemistry DepartmentFaculty of Natural SciencesNovosibirsk National Research State University 2 Pirogova Str., Novosibirsk 630090 Russia
| | - Evgenii V. Korotaev
- Nikolaev Institute of Inorganic Chemistry SB RAS 3 Lavrentiev Avenue, Novosibirsk 630090 Russia
| | - Vladimir R. Shayapov
- Nikolaev Institute of Inorganic Chemistry SB RAS 3 Lavrentiev Avenue, Novosibirsk 630090 Russia
| | - Olga G. Shakirova
- Komsomolsky-na-Amure State Technical University 27 Lenin Avenue, Komsomolsk-na-Amure 681013 Russia
| | - Ludmila G. Lavrenova
- Nikolaev Institute of Inorganic Chemistry SB RAS 3 Lavrentiev Avenue, Novosibirsk 630090 Russia
- Analytical Chemistry DepartmentFaculty of Natural SciencesNovosibirsk National Research State University 2 Pirogova Str., Novosibirsk 630090 Russia
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12
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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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13
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Baldé C, Sylla MS, Desplanches C, Chastanet G. High-spin → low-spin relaxation kinetics and metal dilution effects in 1D spin-crossover chain compounds. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.11.046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Wang D, Gardinier JR, Lindeman SV. Iron( ii) tetrafluoroborate complexes of new tetradentate C-scorpionates as catalysts for the oxidative cleavage of trans-stilbene with H 2O 2. Dalton Trans 2019; 48:14478-14489. [DOI: 10.1039/c9dt02829c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Iron(ii) complexes of two new tetradentate C-scorpionate ligands are characterized. Both catalyze stilbene cleavage using either H2O2 or a O2/photocatalyst oxidant.
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Affiliation(s)
- Denan Wang
- Department of Chemistry
- Marquette University
- Milwaukee
- USA
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15
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Coulton JB, Smith AC, Wheeler KA, Semeniuc RF. Multiple coordination modes of a new ditopic bis(pyrazolyl)methane-based ligand. Dalton Trans 2018; 47:17109-17121. [PMID: 30465668 DOI: 10.1039/c8dt03992e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A new ditopic ligand, N-(2,2-bis(pyrazolyl)ethyl)-2,2-bis(pyrazolyl)acetamide ((pz)2CH-C(O)-NH-CH2-CH(pz)2, L4Pz, pz = pyrazolyl ring), comprising two bis(pyrazolyl)methane donor groups linked via an amide bridge, has been prepared from the reaction of HOOCCH(pz)2 and H2NCH2CH(pz)2. The ligand coordinates to various metallic salts (i.e. AgO3SCF3, PdCl2, Re(CO)5Br, and Fe(BF4)2), in either a κ2-μ-κ2 or a κ3-μ-κ2 fashion, depending on the coordination preferences of the metallic center. These compounds were characterized by NMR, UV-Vis and IR spectroscopy, and in solid state by single crystal X-ray diffraction. In the case of silver(i), a mono-dimensional coordination polymer was obtained, while the others were found to be discrete complexes. The synthesis and characterization of a heterobimetallic complex is also described. In solid state, all compounds are associated into supramolecular architectures via hydrogen bonding and pyrazolyl embrace interactions.
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Affiliation(s)
- John B Coulton
- Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, Illinois 61920, USA.
| | - Aramis C Smith
- Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, Illinois 61920, USA.
| | - Kraig A Wheeler
- Department of Chemistry, Whitworth University, Spokane, Washington 99251, USA
| | - Radu F Semeniuc
- Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, Illinois 61920, USA.
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16
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Spin crossover in homo- and heteroligand iron(II) complexes with tris(pyrazol-1-yl)methane derivatives. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2195-3] [Citation(s) in RCA: 5] [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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17
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Synthesis, crystal structures and high-temperature spin-crossover of new inclusion compounds of iron(II) tris (pyrazol-1-yl)methane complex with p -sulfonatocalix[4]arene. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.02.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Alkorta I, Claramunt RM, Díez-Barra E, Elguero J, de la Hoz A, López C. The organic chemistry of poly(1 H -pyrazol-1-yl)methanes. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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19
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Effects of metal dilution on the spin-crossover behavior and light induced bistability of iron(II) in [Fe Ni1−(bpp)2](NCSe)2. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.08.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Marts AR, Kaine JC, Baum RR, Clayton VL, Bennett JR, Cordonnier LJ, McCarrick R, Hasheminasab A, Crandall LA, Ziegler CJ, Tierney DL. Paramagnetic Resonance of Cobalt(II) Trispyrazolylmethanes and Counterion Association. Inorg Chem 2016; 56:618-626. [PMID: 27977149 DOI: 10.1021/acs.inorgchem.6b02520] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Paramagnetic resonance studies (EPR, ESEEM, ENDOR, and NMR) of a series of cobalt(II) bis-trispyrazolylmethane tetrafluoroborates are presented. The complexes studied include the parent, unsubstituted ligand (Tpm), two pyrazole-substituted derivatives (4Me and 3,5-diMe), and tris(1-pyrazolyl)ethane (Tpe), which includes a methyl group on the apical carbon atom. NMR and ENDOR establish the magnitude of 1H hyperfine couplings, while ESEEM provides information on the coordinated 14N. The data show that the pyrazole 3-position is more electron rich in the Tpm analogues, that the geometry about the apical atom influences the magnetic resonance, and that apical atom geometry appears more fixed in Tpm than in Tp. NMR and ENDOR establish that the BF4- counterion remains associated in fluid solution. In the case of the Tpm3,5Me complex, it appears to associate in solution, in the same position it occupies in the X-ray structure.
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Affiliation(s)
- Amy R Marts
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Joshua C Kaine
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Robert R Baum
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Vivien L Clayton
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Jami R Bennett
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Laura J Cordonnier
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Robert McCarrick
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Abed Hasheminasab
- Department of Chemistry, University of Akron , Akron, Ohio 44325, United States
| | - Laura A Crandall
- Department of Chemistry, University of Akron , Akron, Ohio 44325, United States
| | | | - David L Tierney
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
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21
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Lavrenova LG, Strekalova AD, Smolentsev AI, Naumov DY, Bogomyakov AS, Sheludyakova LA, Vasilevskii SF. Mono- and heteroligand iron(II) complexes with tris(3,5-dimethylpyrazol-1-yl)methane. RUSS J COORD CHEM+ 2016. [DOI: 10.1134/s107032841611004x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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22
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García-Fernández A, Miguel S, Díez J, Gamasa MP, Lastra E. Reactivity of Hydride Half-Sandwich Ruthenium(II) Complexes Bearing the Scorpionate Ligands Hydridotris(pyrazol-1-yl)borate and Tris(pyrazol-1-yl)methanesulfonate. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501247] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Almudena García-Fernández
- Departamento de Química Orgánica e Inorgánica; Instituto de Química Organometálica “Enrique Moles” (Unidad Asociada al CSIC); Universidad de Oviedo; 33006 Oviedo Principado de Asturias Spain
| | - Sara Miguel
- Departamento de Química Orgánica e Inorgánica; Instituto de Química Organometálica “Enrique Moles” (Unidad Asociada al CSIC); Universidad de Oviedo; 33006 Oviedo Principado de Asturias Spain
| | - Josefina Díez
- Departamento de Química Orgánica e Inorgánica; Instituto de Química Organometálica “Enrique Moles” (Unidad Asociada al CSIC); Universidad de Oviedo; 33006 Oviedo Principado de Asturias Spain
| | - Maria Pilar Gamasa
- Departamento de Química Orgánica e Inorgánica; Instituto de Química Organometálica “Enrique Moles” (Unidad Asociada al CSIC); Universidad de Oviedo; 33006 Oviedo Principado de Asturias Spain
| | - Elena Lastra
- Departamento de Química Orgánica e Inorgánica; Instituto de Química Organometálica “Enrique Moles” (Unidad Asociada al CSIC); Universidad de Oviedo; 33006 Oviedo Principado de Asturias Spain
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23
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Zhu YY, Li HQ, Ding ZY, Lü XJ, Zhao L, Meng YS, Liu T, Gao S. Spin transitions in a series of [Fe(pybox)2]2+ complexes modulated by ligand structures, counter anions, and solvents. Inorg Chem Front 2016. [DOI: 10.1039/c6qi00417b] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new family of mononuclear Fe(ii) compounds is synthesized based on pybox ligands. Their spin-crossover behaviours can be effectively mediated by ligand structures, counter anions, and solvents.
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Affiliation(s)
- Yuan-Yuan Zhu
- School of Chemistry and Chemical Engineering
- Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices
- Hefei 230009
- China
| | - Hong-Qing Li
- School of Chemistry and Chemical Engineering
- Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices
- Hefei 230009
- China
| | - Zhong-Yu Ding
- School of Chemistry and Chemical Engineering
- Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices
- Hefei 230009
- China
| | - Xiao-Jin Lü
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- China
| | - Liang Zhao
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- China
| | - Yin-Shan Meng
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Tao Liu
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- China
| | - Song Gao
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
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24
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Santos C, Gómez M, Álvarez E, Ngoune J, Marchetti F, Pettinari R, Pettinari C. Group 9 and 10 complexes with the bidentate di(1H-indazol-1-yl)methane and di(2H-indazol-2-yl)methane ligands: synthesis and structural characterization. NEW J CHEM 2016. [DOI: 10.1039/c5nj03135d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ni, Pd and Co bis(indazol-1-yl)methane complexes assemble into 3D-networks based on intermolecular electrostatic, H-bonds and aromatic interactions.
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Affiliation(s)
- Carina Santos
- Instituto de Investigaciones Químicas (IIQ)
- Consejo Superior de Investigaciones Científicas (CSIC)
- Universidad de Sevilla (US)
- Isla de La Cartuja
- Spain
| | - Margarita Gómez
- Instituto de Investigaciones Químicas (IIQ)
- Consejo Superior de Investigaciones Científicas (CSIC)
- Universidad de Sevilla (US)
- Isla de La Cartuja
- Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas (IIQ)
- Consejo Superior de Investigaciones Científicas (CSIC)
- Universidad de Sevilla (US)
- Isla de La Cartuja
- Spain
| | - Jean Ngoune
- Department of Chemistry
- University of Dschang
- Dschang
- Cameroon
- School of Pharmacy
| | - Fabio Marchetti
- School of Science and Technology
- University of Camerino
- 62032 Camerino
- Italy
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25
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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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26
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Shen FX, Huang W, Yamamoto T, Einaga Y, Wu D. Preparation of dihydroquinazoline carbohydrazone Fe( ii) complexes for spin crossover. NEW J CHEM 2016. [DOI: 10.1039/c5nj03095a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Mononuclear spin-crossover complexes of dihydroquinazoline derivatives were synthesized to enable the spin crossover phenomenon via the variation of the solvent, anion and substituent.
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Affiliation(s)
- Fu-Xing Shen
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing
- School of Petrochemical Engineering
- Changzhou University
- Jiangsu 213164
| | - Wei Huang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing
- School of Petrochemical Engineering
- Changzhou University
- Jiangsu 213164
| | - Takashi Yamamoto
- Department of Chemistry
- Faculty of Science and Technology
- Keio University
- Yokohama
- Japan
| | - Yasuaki Einaga
- Department of Chemistry
- Faculty of Science and Technology
- Keio University
- Yokohama
- Japan
| | - Dayu Wu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing
- School of Petrochemical Engineering
- Changzhou University
- Jiangsu 213164
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27
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Shakirova OG, Lavrenova LG, Bogomyakov AS, Zhizhin KY, Kuznetsov NT. Synthesis and magnetic properties of iron(II) closo-borate complexes with tris(3,5-dimethylpyrazol-1-yl)methane. RUSS J INORG CHEM+ 2015. [DOI: 10.1134/s003602361507013x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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28
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Lavrenova LG, Strekalova AD, Bogomyakov AS, Korotaev EV, Virovets AV, Piryazev DA, Sheludyakova LA, Vasilevskii SF. Spin crossover in heteroligand iron(II) complexes with iris(3,5-dimethylpyrazol-1-yl)methane. RUSS J COORD CHEM+ 2015. [DOI: 10.1134/s1070328415030082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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29
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Schweinfurth D, Demeshko S, Hohloch S, Steinmetz M, Brandenburg JG, Dechert S, Meyer F, Grimme S, Sarkar B. Spin Crossover in Fe(II) and Co(II) Complexes with the Same Click-Derived Tripodal Ligand. Inorg Chem 2014; 53:8203-12. [DOI: 10.1021/ic500264k] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- David Schweinfurth
- Institut für Chemie und Biochemie, Anorganische
Chemie, Fabeckstraße 34-36, D-14195, Berlin, Germany
| | - Serhiy Demeshko
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, D-37077, Göttingen, Germany
| | - Stephan Hohloch
- Institut für Chemie und Biochemie, Anorganische
Chemie, Fabeckstraße 34-36, D-14195, Berlin, Germany
| | - Marc Steinmetz
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische
und Theoretische Chemie, Universität Bonn, Beringstraße 4, D-53115, Bonn, Germany
| | - Jan Gerit Brandenburg
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische
und Theoretische Chemie, Universität Bonn, Beringstraße 4, D-53115, Bonn, Germany
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, D-37077, Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, D-37077, Göttingen, Germany
| | - Stefan Grimme
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische
und Theoretische Chemie, Universität Bonn, Beringstraße 4, D-53115, Bonn, Germany
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie, Anorganische
Chemie, Fabeckstraße 34-36, D-14195, Berlin, Germany
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30
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Shakirova OG, Daletskii VA, Lavrenova LG, Varnek VA, Rudakov DA, Potkin VI. Spin-crossover in complexes of iron(II) carboranes with tris(pyrazol-1-yl)methane. J STRUCT CHEM+ 2014. [DOI: 10.1134/s0022476614010077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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31
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Shakirova OG, Daletskii VA, Lavrenova LG, Trubina SV, Erenburg SB, Zhizhin KY, Kuzhetsov NT. Iron(II) closo-borate complexes with 1,2,4-triazole derivatives: Spin crossover in the iron(II) closo-borate complexes with tris(pyrazol-1-yl)methane. RUSS J INORG CHEM+ 2013. [DOI: 10.1134/s0036023613060211] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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Lavrenova LG, Shakirova OG. Spin Crossover and Thermochromism of Iron(II) Coordination Compounds with 1,2,4-Triazoles and Tris(pyrazol-1-yl)methanes. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200980] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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33
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Shepherd HJ, Molnár G, Nicolazzi W, Salmon L, Bousseksou A. Spin Crossover at the Nanometre Scale. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201201205] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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34
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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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35
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Halcrow MA. Structure:function relationships in molecular spin-crossover complexes. Chem Soc Rev 2011; 40:4119-42. [PMID: 21483934 DOI: 10.1039/c1cs15046d] [Citation(s) in RCA: 668] [Impact Index Per Article: 51.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spin-crossover compounds are becoming increasingly popular for device and sensor applications, and in soft materials, that make use of their switchable colour, paramagnetism and conductivity. The de novo design of new solid spin-crossover compounds with pre-defined switching properties is desirable for application purposes. This challenging problem of crystal engineering requires an understanding of how the temperature and cooperativity of a spin-transition are influenced by the structure of the bulk material. Towards that end, this critical review presents a survey of molecular spin-crossover compounds with good availability of crystallographic data. A picture is emerging that changes in molecular shape between the high- and low-spin states, and the ability of a lattice to accommodate such changes, can play an important role in determining the existence and the cooperativity of a thermal spin-transition in the solid state (198 references).
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Affiliation(s)
- Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT. m.a.halcrow@ leeds.ac.uk
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36
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37
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High-temperature spin-crossover in coordination compounds of iron(II) with tris(pyrazol-1-yl)methane. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.08.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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38
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Syntheses and characterization of mono and dinuclear complexes of platinum group metals bearing benzene-linked bis(pyrazolyl)methane ligands. J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2010.02.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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39
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Shakirova OG, Lavrenova LG, Kurat’eva NV, Naumov DY, Daletskii VA, Sheludyakova LA, Logvinenko VA, Vasilevskii SF. Spin crossover in iron(II) complexes with tris(pyrazol-1-yl)methane. RUSS J COORD CHEM+ 2010. [DOI: 10.1134/s1070328410040068] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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40
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A high-spin Fe(II)/low-spin Fe(III) redox couple featuring the hydro[tris(4-chloro-3,5-dimethyl-pyrazolyl)]borate ligand: Synthesis, spectroscopic and X-ray crystallographic characterization. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2009.01.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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41
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Mishra V, Mishra H, Mukherjee R, Codjovi E, Linarès J, Létard JF, Desplanches C, Baldé C, Enachescu C, Varret F. Spin-transition in [FeII(L5)2][ClO4]2 [L5 = 2-[3-(2′-pyridyl)pyrazol-1-ylmethyl](1-methylimidazole)]: a further example of coexistence of features typical for disorder and cooperativity. Dalton Trans 2009:7462-72. [DOI: 10.1039/b901397k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Salmon L, Molnár G, Cobo S, Oulié P, Etienne M, Mahfoud T, Demont P, Eguchi A, Watanabe H, Tanaka K, Bousseksou A. Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]. NEW J CHEM 2009. [DOI: 10.1039/b902811k] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Hamon P, Thépot JY, Le Floch M, Boulon ME, Cador O, Golhen S, Ouahab L, Fadel L, Saillard JY, Hamon JR. Dramatic Remote Substitutent Effects on the Electronic Spin State of Bis(scorpionate) Iron(II) Complexes. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200802567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Hamon P, Thépot JY, Le Floch M, Boulon ME, Cador O, Golhen S, Ouahab L, Fadel L, Saillard JY, Hamon JR. Dramatic Remote Substitutent Effects on the Electronic Spin State of Bis(scorpionate) Iron(II) Complexes. Angew Chem Int Ed Engl 2008; 47:8687-91. [DOI: 10.1002/anie.200802567] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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45
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Quesada M, Prins F, Bill E, Kooijman H, Gamez P, Roubeau O, Spek A, Haasnoot J, Reedijk J. Counterion Effect on the Spin-Transition Properties of the Cation [Fe(btzx)3]2+(btzx=m-Xylylenebis(tetrazole)). Chemistry 2008; 14:8486-99. [DOI: 10.1002/chem.200800990] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Silva RM, Gwengo C, Lindeman SV, Smith MD, Long GJ, Grandjean F, Gardinier JR. A Second-Generation Janus Scorpionate Ligand: Controlling Coordination Modes in Iron(II) Complexes by Steric Modulation. Inorg Chem 2008; 47:7233-42. [DOI: 10.1021/ic8005794] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rosalice M. Silva
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010, and Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium
| | - Chengeto Gwengo
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010, and Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium
| | - Sergey V. Lindeman
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010, and Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium
| | - Mark D. Smith
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010, and Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium
| | - Gary J. Long
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010, and Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium
| | - Fernande Grandjean
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010, and Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium
| | - James R. Gardinier
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010, and Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium
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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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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, Watson RP, Smith MD. Silver(I) Complexes of Fixed, Polytopic Bis(pyrazolyl)methane Ligands: Influence of Ligand Geometry on the Formation of Discrete Metallacycles and Coordination Polymers. Inorg Chem 2006; 45:10077-87. [PMID: 17140213 DOI: 10.1021/ic0613053] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reactions of the arene-linked bis(pyrazolyl)methane ligands m-bis[bis(1-pyrazolyl)methyl]benzene, (m-[CH(pz)2]2C6H4, Lm), p-bis[bis(1-pyrazolyl)methyl]benzene, (p-[CH(pz)2]2C6H4, Lp), and 1,3,5-tris[bis(1-pyrazolyl)methyl]benzene (1,3,5-[CH(pz)2]3C6H3, L3) with AgX salts (pz = 1-pyrazolyl; X = BF4- or PF6-) yield two types of molecular motifs depending on the arrangement of the ligating sites about the central arene ring. Reactions of the m-phenylene-linked Lm with AgBF4 and AgPF6 afford complexes consisting of discrete, metallacyclic dications: [Ag2(mu-Lm)2](BF4)2 (1) and [Ag2(mu-Lm)2](PF6)2 (2). When the p-phenylene-linked Lp is treated with AgBF4 and AgPF6, acyclic, cationic coordination polymers are obtained: {[Ag(mu-Lp)]BF4}infinity (3) and {[Ag(mu-Lp)]PF6}infinity (4). Reaction of the ligand L3, containing three bis(pyrazolyl)methane units in a meta arrangement, with an equimolar amount of AgBF4 again yields discrete metallacyclic dications in which one bis(pyrazolyl)methane unit on each ligand remains unbound: [Ag2(mu-L3)2](BF4)2 (5). Treatment of L3 with an excess of AgBF4 affords a polymer of metallacycles, {[Ag3(mu-L3)2](BF4)3}infinity (6), with one of the bis(pyrazolyl)methane units on each ligand bound to a silver cation bridging two metallacycles. The supramolecular structures of the silver(I) complexes 1-6 are organized by noncovalent interactions, including weak hydrogen bonding, pi-pi, and anion-pi interactions.
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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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Quesada M, Monrabal M, Aromí G, de la Peña-O'Shea VA, Gich M, Molins E, Roubeau O, Teat SJ, MacLean EJ, Gamez P, Reedijk J. Spin transition in a triazine-based Fe(ii) complex: variable-temperature structural, thermal, magnetic and spectroscopic studies. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b602903e] [Citation(s) in RCA: 36] [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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