1
|
Zhang Y, Torres-Cavanillas R, Yan X, Zeng Y, Jiang M, Clemente-León M, Coronado E, Shi S. Spin crossover iron complexes with spin transition near room temperature based on nitrogen ligands containing aromatic rings: from molecular design to functional devices. Chem Soc Rev 2024; 53:8764-8789. [PMID: 39072682 DOI: 10.1039/d3cs00688c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
During last decades, significant advances have been made in iron-based spin crossover (SCO) complexes, with a particular emphasis on achieving reversible and reproducible thermal hysteresis at room temperature (RT). This pursuit represents a pivotal goal within the field of molecular magnetism, aiming to create molecular devices capable of operating in ambient conditions. Here, we summarize the recent progress of iron complexes with spin transition near RT based on nitrogen ligands containing aromatic rings from molecular design to functional devices. Specifically, we discuss the various factors, including supramolecular interactions, crystal packing, guest molecules and pressure effects, that could influence its cooperativity and the spin transition temperature. Furthermore, the most recent advances in their implementation as mechanical actuators, switching/memories, sensors, and other devices, have been introduced as well. Finally, we give a perspective on current challenges and future directions in SCO community.
Collapse
Affiliation(s)
- Yongjie Zhang
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Ramón Torres-Cavanillas
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Xinxin Yan
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Yixun Zeng
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Mengyun Jiang
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Miguel Clemente-León
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Shengwei Shi
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
- Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), Jianghan University, Wuhan, 430056, China
| |
Collapse
|
2
|
Wegeberg C, Häussinger D, Kupfer S, Wenger OS. Controlling the Photophysical Properties of a Series of Isostructural d 6 Complexes Based on Cr 0, Mn I, and Fe II. J Am Chem Soc 2024; 146:4605-4619. [PMID: 38334415 PMCID: PMC10885143 DOI: 10.1021/jacs.3c11580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
Development of first-row transition metal complexes with similar luminescence and photoredox properties as widely used RuII polypyridines is attractive because metals from the first transition series are comparatively abundant and inexpensive. The weaker ligand field experienced by the valence d-electrons of first-row transition metals challenges the installation of the same types of metal-to-ligand charge transfer (MLCT) excited states as in precious metal complexes, due to rapid population of energetically lower-lying metal-centered (MC) states. In a family of isostructural tris(diisocyanide) complexes of the 3d6 metals Cr0, MnI, and FeII, the increasing effective nuclear charge and ligand field strength allow us to control the energetic order between the 3MLCT and 3MC states, whereas pyrene decoration of the isocyanide ligand framework provides control over intraligand (ILPyr) states. The chromium(0) complex shows red 3MLCT phosphorescence because all other excited states are higher in energy. In the manganese(I) complex, a microsecond-lived dark 3ILPyr state, reminiscent of the types of electronic states encountered in many polyaromatic hydrocarbon compounds, is the lowest and becomes photoactive. In the iron(II) complex, the lowest MLCT state has shifted to so much higher energy that 1ILPyr fluorescence occurs, in parallel to other excited-state deactivation pathways. Our combined synthetic-spectroscopic-theoretical study provides unprecedented insights into how effective nuclear charge, ligand field strength, and ligand π-conjugation affect the energetic order between MLCT and ligand-based excited states, and under what circumstances these individual states become luminescent and exploitable in photochemistry. Such insights are the key to further developments of luminescent and photoredox-active first-row transition metal complexes.
Collapse
Affiliation(s)
- Christina Wegeberg
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Daniel Häussinger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Stephan Kupfer
- Institute of Physical Chemistry, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Oliver S Wenger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| |
Collapse
|
3
|
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.
Collapse
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.
| |
Collapse
|
4
|
Nößler M, Neuman NI, Böser L, Jäger R, Singha Hazari A, Hunger D, Pan Y, Lücke C, Bens T, van Slageren J, Sarkar B. Spin Crossover and Fluorine-Specific Interactions in Metal Complexes of Terpyridines with Polyfluorocarbon Tails. Chemistry 2023; 29:e202301246. [PMID: 37191067 DOI: 10.1002/chem.202301246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/15/2023] [Accepted: 05/16/2023] [Indexed: 05/17/2023]
Abstract
In coordination chemistry and materials science, terpyridine ligands are of great interest, due to their ability to form stable complexes with a broad range of transition metal ions. We report three terpyridine ligands containing different perfluorocarbon (PFC) tails on the backbone and the corresponding FeII and CoII complexes. The CoII complexes display spin crossover close to ambient temperature, and the nature of this spin transition is influenced by the length of the PFC tail on the ligand backbone. The electrochemical properties of the metal complexes were investigated with cyclic voltammetry revealing one oxidation and several reduction processes. The fluorine-specific interactions were investigated by EPR measurements. Analysis of the EPR spectra of the complexes as microcrystalline powders and in solution reveals exchange-narrowed spectra without resolved hyperfine splittings arising from the 59 Co nucleus; this suggests complex aggregation in solution mediated by interactions of the PFC tails. Interestingly, addition of perfluoro-octanol in different ratios to the acetonitrile solution of the sample resulted in the disruption of the F ⋯ ${\cdots }$ F interactions of the tails. To the best of our knowledge, this is the first investigation of fluorine-specific interactions in metal complexes through EPR spectroscopy, as exemplified by exchange narrowing.
Collapse
Affiliation(s)
- Maite Nößler
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - Nicolás I Neuman
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
- Instituto de Desarrollo Tecnológico para la Industria Química, INTEC, UNL-CONICET Predio CCT Conicet "Dr. Alberto Cassano", Colectora RN 168, Km 0, Paraje El Pozo, 3000, Santa Fe, Argentina
| | - Lisa Böser
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - René Jäger
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - Arijit Singha Hazari
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - David Hunger
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Yixian Pan
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Clemens Lücke
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Tobias Bens
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Joris van Slageren
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| |
Collapse
|
5
|
Omar S, Irran E, Wiedemann D, Baabe D, Grohmann A. Sterically crowded di-indazolyl-pyridines: Iron(II) complexation studies. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2023. [DOI: 10.1515/znb-2023-0311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
Abstract
Abstract
4-(2,6-Di(2H-indazol-2-yl)pyridin-4-yl)benzoic acid (1) and 10-(2,6-di(1H-pyrazol-1-yl)pyridin-4-yl)anthracene-9-carboxylic acid (2) were required for adsorption studies on Ag(111), with a view to subsequent iron(II) complexation and formation of well-ordered spin-responsive self-assembled monolayers. While the generation of these compounds has remained elusive, several intermediates and by-products were obtained, potentially useful as dipyrazolylpyridine-related derivatives and for metal ion coordination. 3,5-Dichloro-2,6-diindazolylpyridine-4-amine, which forms as a mixture of regioisomers, was synthesised, the mixture separated, and the components characterised (3,5-dichloro-2,6-di(2H-indazol-2-yl)pyridin-4-amine; 3,5-dichloro-2-(1H-indazol-1-yl)-6-(2H-indazol-2-yl)pyridin-4-amine; 3,5-dichloro-2,6-di(1H-indazol-1-yl)pyridin-4-amine). Their iron(II) complexes have been prepared and fully characterised, including single crystal X-ray structure determination. The complexes are instructive examples of the influence of ligand design (“steric jamming”) on the spin-crossover (SCO) activity of FeII centres. Bulky substitution, which entails twisted ligand conformation, increases intramolecular crowding. This prevents contraction of the metal coordination sphere, which would be a prerequisite for thermally inducible SCO. Mössbauer spectroscopy has revealed that the complexes remain predominantly high-spin (HS) between 20 and 200 K, and that a mixture of conformational HS isomers is present in the microcrystalline solid.
Collapse
Affiliation(s)
- Suhad Omar
- Institut für Chemie, Technische Universität Berlin , Straße des 17. Juni 135, 10623 Berlin , Germany
| | - Elisabeth Irran
- Institut für Chemie, Technische Universität Berlin , Straße des 17. Juni 135, 10623 Berlin , Germany
| | - Dennis Wiedemann
- Institut für Chemie, Technische Universität Berlin , Straße des 17. Juni 135, 10623 Berlin , Germany
- GfBU-Consult Gesellschaft für Umwelt- und Managementberatung mbH , Mahlsdorfer Straße 61b, 15366 Hoppegarten , Germany
| | - Dirk Baabe
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig , Hagenring 30, 38106 Braunschweig , Germany
| | - Andreas Grohmann
- Institut für Chemie, Technische Universität Berlin , Straße des 17. Juni 135, 10623 Berlin , Germany
| |
Collapse
|
6
|
Sinha N, Wenger OS. Photoactive Metal-to-Ligand Charge Transfer Excited States in 3d 6 Complexes with Cr 0, Mn I, Fe II, and Co III. J Am Chem Soc 2023; 145:4903-4920. [PMID: 36808978 PMCID: PMC9999427 DOI: 10.1021/jacs.2c13432] [Citation(s) in RCA: 40] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Many coordination complexes and organometallic compounds with the 4d6 and 5d6 valence electron configurations have outstanding photophysical and photochemical properties, which stem from metal-to-ligand charge transfer (MLCT) excited states. This substance class makes extensive use of the most precious and least abundant metal elements, and consequently there has been a long-standing interest in first-row transition metal compounds with photoactive MLCT states. Semiprecious copper(I) with its completely filled 3d subshell is a relatively straightforward and well explored case, but in 3d6 complexes the partially filled d-orbitals lead to energetically low-lying metal-centered (MC) states that can cause undesirably fast MLCT excited state deactivation. Herein, we discuss recent advances made with isoelectronic Cr0, MnI, FeII, and CoIII compounds, for which long-lived MLCT states have become accessible over the past five years. Furthermore, we discuss possible future developments in the search for new first-row transition metal complexes with partially filled 3d subshells and photoactive MLCT states for next-generation applications in photophysics and photochemistry.
Collapse
Affiliation(s)
- Narayan Sinha
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Oliver S Wenger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| |
Collapse
|
7
|
4-Phenyl-2-(2′-pyridyl) quinoline acts as a highly sensitive fluorescent probe for Fe2+ and Fe3+ ions and exhibits reversible photoelectric stimulation response. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
8
|
Li R, Kalita VM, Fylymonov H, Xu W, Li Q, Real JA, Liu B, Levchenko G. Pressure-Induced Mixed States Caused by Spin-Elastic Interactions during First-Order Spin Phase Transition in Spin Crossover Compounds. Inorg Chem 2022; 61:14752-14760. [PMID: 36074955 DOI: 10.1021/acs.inorgchem.2c02124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Recently, the possibility of exploiting the phenomenon of spin transition (ST) has been intensively investigated; therefore, it is particularly important to study the behavior of ST under various stimuli. Here, the shape and content of the intermediate phase of ST in Hoffmann-like compounds [Fe(Fpz)2M(CN)4] (M = Pt, Pd) under external stimuli are studied. For this purpose, magnetic and Raman spectroscopy studies were carried out. In pressure-induced spin transition (PIST), a mixture of high-spin and low-spin states appears, while in temperature-induced spin transition (TIST), a homogeneous state occurs. The first-order ST induced by pressure has a hysteresis but is not abrupt. However, the temperature-induced spin transition at ambient pressure is hysteretic and abrupt. To investigate this difference, we discuss using a thermodynamic model that considers elastic interactions, showing that the slope of the hysteresis loop is related to the appearance of internal pressure, which is related to the difference in sample compressibility under high-spin and low-spin states.
Collapse
Affiliation(s)
- Ruixin Li
- State Key Laboratory of Superhard Materials, International Centre of Future Science, Jilin University, Changchun 130012, China
| | - Viktor M Kalita
- Institute of Magnetism of NAS of Ukraine and MES of Ukraine, 36-b Vernadsky Boulevard, Kyiv 03142, Ukraine.,National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Prospekt Peremohy 37, Kyiv 03056, Ukraine.,Institute of Physics, NAS of Ukraine, Prospekt Nauky 46, Kyiv 03028, Ukraine
| | - Hennadii Fylymonov
- Donetsk Institute of Physics and Engineering Named after A.A. Galkin, Kyiv 03028, Ukraine
| | - Wei Xu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
| | - Quanjun Li
- State Key Laboratory of Superhard Materials, International Centre of Future Science, Jilin University, Changchun 130012, China
| | - José Antonio Real
- Institut de Ciència Molecular, Departament de Química Inorgànica, Universitat de València, València E-46980, Spain
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials, International Centre of Future Science, Jilin University, Changchun 130012, China
| | - Georgiy Levchenko
- State Key Laboratory of Superhard Materials, International Centre of Future Science, Jilin University, Changchun 130012, China.,Donetsk Institute of Physics and Engineering Named after A.A. Galkin, Kyiv 03028, Ukraine
| |
Collapse
|
9
|
Javed MK, Sulaiman A, Yamashita M, Li ZY. Shedding light on bifunctional luminescent spin crossover materials. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
10
|
Gamonal Ruiz-Crespo A, Galán-Fernández L, Martínez-Martín P, Rodríguez-Ubis JC. An Orthogonal Synthetic Approach to Nonsymmetrical Bisazolyl 2,4,6-Trisubstituted Pyridines. Molecules 2022; 27:1746. [PMID: 35268847 PMCID: PMC8911976 DOI: 10.3390/molecules27051746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/02/2022] [Accepted: 03/05/2022] [Indexed: 11/16/2022] Open
Abstract
A three-step synthetic route giving access to nonsymmetrical bisazolyl 2,4,6-trisubstituted pyridines with different substituents on the pyrazole, indazole, and pyridine heterocycles is described. From the readily available 4-bromo-2,6-difluoropyridine, both fluorine atoms allow for easy selective stepwise substitution, and the bromine atom provides easy access to additional functionalities through both Suzuki and Sonogashira Pd(0) cross-coupling reactions. These synthons represent optimal structures as building blocks in complexation and metalloorganic structures for the tuning of their chelating and photophysical properties.
Collapse
Affiliation(s)
| | | | | | - Juan Carlos Rodríguez-Ubis
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain; (A.G.R.-C.); (L.G.-F.); (P.M.-M.)
| |
Collapse
|
11
|
Horniichuk OY, Ridier K, Molnár G, Kotsyubynsky VO, Shova S, Amirkhanov VM, Gural'skiy IA, Salmon L, Bousseksou A. Solvatomorphism, polymorphism and spin crossover in bis[hydrotris(1,2,3-triazol-1-yl)borate]iron( ii). NEW J CHEM 2022. [DOI: 10.1039/d2nj01471h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We describe a detailed characterization of the spin crossover bis[hydrotris(1,2,3-triazol-1-yl)borate]iron(ii) complex ([Fe(HB(1,2,3-tz)3)2]) and solvatomorphs obtained by recrystallisation or single crystal to single crystal transformation.
Collapse
Affiliation(s)
- Oleksandr Ye. Horniichuk
- Taras Shevchenko National University of Kyiv, Department of Chemistry, 64 Volodymyrska St., 01601 Kyiv, Ukraine
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - Karl Ridier
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - Gábor Molnár
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - Volodymyr O. Kotsyubynsky
- Department of Material Science and New Technology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk 76018, Ukraine
| | - Sergiu Shova
- “Petru Poni” Institute of Macromolecular Chemistry, 41A Aleea Gr. Ghica Voda, 700487 Iasi, Romania
| | - Vladimir M. Amirkhanov
- Taras Shevchenko National University of Kyiv, Department of Chemistry, 64 Volodymyrska St., 01601 Kyiv, Ukraine
| | - Il’ya A. Gural'skiy
- Taras Shevchenko National University of Kyiv, Department of Chemistry, 64 Volodymyrska St., 01601 Kyiv, Ukraine
| | - Lionel Salmon
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - Azzedine Bousseksou
- LCC, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| |
Collapse
|
12
|
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.
Collapse
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.
| |
Collapse
|
13
|
Luo B, Pan Y, Meng Y, Liu Q, Yin J, Liu T, Zhu Y. Construction of Magneto‐Fluorescent Bifunctional Spin‐Crossover Fe(II) Complex from Pyrene‐Decorated Pybox Ligand. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100622] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bing‐Xue Luo
- School of Chemistry and Chemical Engineering and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering Hefei University of Technology 193 Tunxi Road Hefei 230009 China
| | - Yao Pan
- School of Chemistry and Chemical Engineering and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering Hefei University of Technology 193 Tunxi Road Hefei 230009 China
| | - Yin‐Shan Meng
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Qiang Liu
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Jun Yin
- School of Chemistry and Chemical Engineering and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering Hefei University of Technology 193 Tunxi Road Hefei 230009 China
| | - Tao Liu
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Yuan‐Yuan Zhu
- School of Chemistry and Chemical Engineering and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering Hefei University of Technology 193 Tunxi Road Hefei 230009 China
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| |
Collapse
|
14
|
Spin-Crossover in Iron(II) Complexes of N,N′-Disubstituted 2,6-Bis(Pyrazol-3-yl)Pyridines: An Effect of a Distal Substituent in the 2,6-Dibromophenyl Group. CRYSTALS 2021. [DOI: 10.3390/cryst11080922] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A series of new bis(pyrazol-3-yl)pyridines (LR) N,N′-disubstituted by 4-functionalized 2,6-dibromophenyl groups have been synthesized to study the effect of a distal substituent on the spin-crossover (SCO) behaviour of the iron(II) complexes [Fe(LR)2](ClO4)2 by variable-temperature magnetometry, NMR spectroscopy, and X-ray diffraction. The SCO-assisting tendency of the substituents with different electronic and steric properties (i.e., the bromine atom and the methyl group) in the para-position of the 2,6-dibromophenyl group is discussed. Together with earlier reported SCO-active iron(II) complexes with N,N′-disubstituted bis(pyrazol-3-yl)pyridines, these new complexes open the way for this family of SCO compounds to emerge as an effective ‘tool’ in revealing structure–function relations, a prerequisite for successful molecular design of switchable materials for future breakthrough applications in sensing, switching, and memory devices.
Collapse
|
15
|
Galadzhun I, Kulmaczewski R, Cespedes O, Halcrow MA. Iron/2,6‐Di(pyrazol‐1‐yl)pyridine Complexes with a Discotic Pattern of Alkyl or Alkynyl Substituents. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100435] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Iurii Galadzhun
- School of Chemistry University of Leeds Woodhouse Lane Leeds LS2 9JT UK
| | | | - Oscar Cespedes
- School of Physics and Astronomy University of Leeds EC Stoner Building Leeds LS2 9JT UK
| | | |
Collapse
|
16
|
Akiyoshi R, Komatsumaru Y, Donoshita M, Dekura S, Yoshida Y, Kitagawa H, Kitagawa Y, Lindoy LF, Hayami S. Ferroelectric and Spin Crossover Behavior in a Cobalt(II) Compound Induced by Polar-Ligand-Substituent Motion. Angew Chem Int Ed Engl 2021; 60:12717-12722. [PMID: 33713041 DOI: 10.1002/anie.202015322] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 03/12/2021] [Indexed: 02/01/2023]
Abstract
Ferroelectric spin crossover (SCO) behavior is demonstrated to occur in the cobalt(II) complex, [Co(FPh-terpy)2 ](BPh4 )2 ⋅3ac (1⋅3 ac; FPh-terpy=4'-((3-fluorophenyl)ethynyl)-2,2':6',2''-terpyridine) and is dependent on the degree of 180° flip-flop motion of the ligand's polar fluorophenyl ring. Single crystal X-ray structures at several temperatures confirmed the flip-flop motion of fluorobenzene ring and also gave evidence for the SCO behavior with the latter behavior also confirmed by magnetic susceptibility measurements. The molecular motion of the fluorobenzene ring was also revealed using solid-state 19 F NMR spectroscopy. Thus the SCO behavior is accompanied by the flip-flop motion of the fluorobenzene ring, leading to destabilization of the low spin cobalt(II) state; with the magnitude of rotation able to be controlled by an electric field. This first example of spin-state conversion being dependent on the molecular motion of a ligand-appended fluorobenzene ring in a SCO cobalt(II) compound provides new insight for the design of a new category of molecule-based magnetoelectric materials.
Collapse
Affiliation(s)
- Ryohei Akiyoshi
- Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan
| | - Yuki Komatsumaru
- Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan
| | - Masaki Donoshita
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Shun Dekura
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yukihiro Yoshida
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yasutaka Kitagawa
- Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
| | - Leonard F Lindoy
- School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Shinya Hayami
- Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan.,Institute of Industrial Nanomaterials (IINa), Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan
| |
Collapse
|
17
|
Capel Berdiell I, García-López V, Howard MJ, Clemente-León M, Halcrow MA. The effect of tether groups on the spin states of iron(II)/bis[2,6-di(pyrazol-1-yl)pyridine] complexes. Dalton Trans 2021; 50:7417-7426. [PMID: 33969863 DOI: 10.1039/d1dt01076j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The synthesis of six 2,6-di(pyrazol-1-yl)pyridine derivatives bearing dithiolane or carboxylic acid tether groups is described: [2,6-di(pyrazol-1-yl)pyrid-4-yl]methyl (R)-lipoate (L1), 2-[(2,6-di(pyrazol-1-yl)pyridine)-4-carboxamido]ethyl (R)-lipoate (L2), 2-[(2,6-di(pyrazol-1-yl)pyridine)-4-carboxy]ethyl (R)-lipoate (L3), N-([2,6-di(pyrazol-1-yl)pyrid-4-ylsulfanyl]-2-aminoethyl (R)-lipoamide (L4), 2-[(2,6-di(pyrazol-1-yl)pyridine)-4-carboxamido]acetic acid (L5) and 2-[(2,6-di(pyrazol-1-yl)pyridine)-4-carboxamido]propionic acid (L6). The iron(ii) perchlorate complexes of all the new ligands exhibit gradual thermal spin-crossover (SCO) in the solid state above room temperature, except L4 whose complex remains predominantly high-spin. Crystalline [Fe(L6)2][ClO4]2·2MeCN contains three unique cation sites which alternate within hydrogen-bonded chains, and undergo gradual SCO at different temperatures upon warming. The SCO midpoint temperature (T1/2) of the complexes in CD3CN solution ranges between 208-274 K, depending on the functional group linking the tether groups to the pyridyl ring. This could be useful for predicting how these complexes might behave when deposited on gold or silica surfaces.
Collapse
Affiliation(s)
- Izar Capel Berdiell
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
| | - Victor García-López
- Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán 2, 46980, Spain
| | - Mark J Howard
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
| | - Miguel Clemente-León
- Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán 2, 46980, Spain
| | - Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
| |
Collapse
|
18
|
Akiyoshi R, Komatsumaru Y, Donoshita M, Dekura S, Yoshida Y, Kitagawa H, Kitagawa Y, Lindoy LF, Hayami S. Ferroelectric and Spin Crossover Behavior in a Cobalt(II) Compound Induced by Polar‐Ligand‐Substituent Motion. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ryohei Akiyoshi
- Department of Chemistry Graduate School of Science and Technology Kumamoto University 2-39-1 Kurokami, Chuo-ku Kumamoto 860-8555 Japan
| | - Yuki Komatsumaru
- Department of Chemistry Graduate School of Science and Technology Kumamoto University 2-39-1 Kurokami, Chuo-ku Kumamoto 860-8555 Japan
| | - Masaki Donoshita
- Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho, Sakyo-ku Kyoto 606-8502 Japan
| | - Shun Dekura
- Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho, Sakyo-ku Kyoto 606-8502 Japan
| | - Yukihiro Yoshida
- Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho, Sakyo-ku Kyoto 606-8502 Japan
| | - Hiroshi Kitagawa
- Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho, Sakyo-ku Kyoto 606-8502 Japan
| | - Yasutaka Kitagawa
- Division of Chemical Engineering Department of Materials Engineering Science Graduate School of Engineering Science Osaka University 1–3, Machikaneyama, Toyonaka Osaka 560-8531 Japan
| | - Leonard F. Lindoy
- School of Chemistry The University of Sydney Sydney NSW 2006 Australia
| | - Shinya Hayami
- Department of Chemistry Graduate School of Science and Technology Kumamoto University 2-39-1 Kurokami, Chuo-ku Kumamoto 860-8555 Japan
- Institute of Industrial Nanomaterials (IINa) Kumamoto University 2-39-1 Kurokami, Chuo-ku Kumamoto 860-8555 Japan
| |
Collapse
|
19
|
Campanella AJ, Nguyen MT, Zhang J, Ngendahimana T, Antholine WE, Eaton GR, Eaton SS, Glezakou VA, Zadrozny JM. Ligand control of low-frequency electron paramagnetic resonance linewidth in Cr(III) complexes. Dalton Trans 2021; 50:5342-5350. [PMID: 33881070 PMCID: PMC8173706 DOI: 10.1039/d1dt00066g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Understanding how the ligand shell controls low-frequency electron paramagnetic resonance (EPR) spectroscopic properties of metal ions is essential if they are to be used in EPR-based bioimaging schemes. In this work, we probe how specific variations in the ligand structure impact L-band (ca. 1.3 GHz) EPR spectroscopic linewidths in the trichloride salts of five Cr(iii) complexes: [Cr(RR-dphen)3]3+ (RR-dphen = (1R,2R)-(+)-diphenylethylenediamine, 1), [Cr(en)3]3+ (en = ethylenediamine, 2), [Cr(me-en)3]3+ (me-en = 1,2-diaminopropane, 3), [Cr(tn)3]3+ (tn = 1,3-diaminopropane, 4) [Cr(trans-chxn)3]3+ (trans-chxn = trans-(±)-1,2-diaminocyclohexane, 5). Spectral broadening varies in a nonintuitive manner across the series, showing the sharpest peaks for 1 and broadest for 5. Molecular dynamics simulations provide evidence that the broadening is correlated to rigidity in the inner coordination sphere and reflected in ligand-dependent distribution of Cr-N bond distances that can be found in frozen solution.
Collapse
Affiliation(s)
- Anthony J Campanella
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
| | - Manh-Thuong Nguyen
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
| | - Jun Zhang
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
| | - Thacien Ngendahimana
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80208, USA
| | - William E Antholine
- National Biomedical EPR Center, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Gareth R Eaton
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80208, USA
| | - Sandra S Eaton
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80208, USA
| | | | - Joseph M Zadrozny
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
| |
Collapse
|
20
|
Kulmaczewski R, Bamiduro F, Shahid N, Cespedes O, Halcrow MA. Structural Transformations and Spin-Crossover in [FeL 2 ] 2+ Salts (L=4-{tert-Butylsulfanyl}-2,6-di{pyrazol-1-yl}pyridine): The Influence of Bulky Ligand Substituents. Chemistry 2021; 27:2082-2092. [PMID: 33073890 DOI: 10.1002/chem.202004072] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 10/16/2020] [Indexed: 11/06/2022]
Abstract
4-(tert-Butylsulfanyl)-2,6-di(pyrazol-1-yl)pyridine (L) was obtained in low yield from a one-pot reaction of 2,4,6-trifluoropyridine with 2-methylpropane-2-thiolate and sodium pyrazolate in a 1:1:2 ratio. The materials [FeL2 ][BF4 ]2 ⋅solv (1[BF4 ]2 ⋅solv) and [FeL2 ][ClO4 ]2 ⋅solv (1[ClO4 ]2 ⋅solv; solv=MeNO2 , MeCN or Me2 CO) exhibit a variety of structures and spin-state behaviors including thermal spin-crossover (SCO). Solvent loss on heating 1[BF4 ]2 ⋅x MeNO2 (x≈2.3) occurs in two steps. The intermediate phase exhibits hysteretic SCO around 250 K, involving a "reverse-SCO" step in its warming cycle at a scan rate of 5 K min-1 . The reverse-SCO is not observed in a slower 1 K min-1 measurement, however, confirming its kinetic nature. The final product [FeL2 ][BF4 ]2 ⋅0.75 MeNO2 was crystallographically characterized, and shows abrupt but incomplete SCO at 172 K which correlates with disorder of an L ligand. The asymmetric unit of 1[BF4 ]2 ⋅y Me2 CO (y≈1.6) contains five unique complex molecules, four of which undergo gradual SCO in at least two discrete steps. Low-spin 1[ClO4 ]2 ⋅0.5 Me2 CO is not isostructural with its BF4 - congener, and undergoes single-crystal-to-single-crystal solvent loss with a tripling of the crystallographic unit cell volume, while retaining the P 1 ‾ space group. Three other solvate salts undergo gradual thermal SCO. Two of these are isomorphous at room temperature, but transform to different low-temperature phases when the materials are fully low-spin.
Collapse
Affiliation(s)
- Rafal Kulmaczewski
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Faith Bamiduro
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK
| | - Namrah Shahid
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Oscar Cespedes
- School of Physics and Astronomy, University of Leeds, E. C. Stoner Building, Leeds, LS2 9JT, UK
| | - Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| |
Collapse
|
21
|
Palacios-Corella M, Ramos-Soriano J, Souto M, Ananias D, Calbo J, Ortí E, Illescas BM, Clemente-León M, Martín N, Coronado E. Hexakis-adducts of [60]fullerene as molecular scaffolds of polynuclear spin-crossover molecules. Chem Sci 2020; 12:757-766. [PMID: 34163809 PMCID: PMC8178998 DOI: 10.1039/d0sc05875k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A family of hexakis-substituted [60]fullerene adducts endowed with the well-known tridentate 2,6-bis(pyrazol-1-yl)pyridine (bpp) ligand for spin-crossover (SCO) systems has been designed and synthesized. It has been experimentally and theoretically demonstrated that these molecular scaffolds are able to form polynuclear SCO complexes in solution. UV-vis and fluorescence spectroscopy studies have allowed monitoring of the formation of up to six Fe(ii)–bpp SCO complexes. In addition, DFT calculations have been performed to model the different complexation environments and simulate their electronic properties. The complexes retain SCO properties in the solid state exhibiting both thermal- and photoinduced spin transitions, as confirmed by temperature-dependent magnetic susceptibility and Raman spectroscopy measurements. The synthesis of these complexes demonstrates that [60]fullerene hexakis-adducts are excellent and versatile platforms to develop polynuclear SCO systems in which a fullerene core is surrounded by a SCO molecular shell. Polynuclear spin-crossover molecules showing both thermal and photoinduced spin transitions have been prepared using a [60]fullerene hexakis-adduct endowed with Fe(ii) complexes of tridentate 2,6-bis(pyrazol-1-yl)pyridine (bpp) ligand.![]()
Collapse
Affiliation(s)
- Mario Palacios-Corella
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia Catedrático José Beltrán 2 46980 Paterna Spain
| | - Javier Ramos-Soriano
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense 28040 Madrid Spain
| | - Manuel Souto
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia Catedrático José Beltrán 2 46980 Paterna Spain .,CICECO-Aveiro Institute of Materials, Department of Chemistry, Universidade de Aveiro Campus Universitário de Santiago 3810-193 Aveiro Portugal
| | - Duarte Ananias
- CICECO-Aveiro Institute of Materials, Department of Chemistry, Universidade de Aveiro Campus Universitário de Santiago 3810-193 Aveiro Portugal
| | - Joaquín Calbo
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia Catedrático José Beltrán 2 46980 Paterna Spain
| | - Enrique Ortí
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia Catedrático José Beltrán 2 46980 Paterna Spain
| | - Beatriz M Illescas
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense 28040 Madrid Spain
| | - Miguel Clemente-León
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia Catedrático José Beltrán 2 46980 Paterna Spain
| | - Nazario Martín
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense 28040 Madrid Spain.,IMDEA-Nanoscience C/Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia Catedrático José Beltrán 2 46980 Paterna Spain
| |
Collapse
|
22
|
Capel Berdiell I, Kulmaczewski R, Warriner SL, Cespedes O, Halcrow MA. Iron and Silver Complexes of 4‐(Imidazol‐1‐yl)‐2,6‐di(pyrazol‐1‐yl)‐pyridine (
L
), Including a [Fe
3
(µ‐F)
2
F
6
L
8
]
+
Assembly. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000782] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | | | | | - Oscar Cespedes
- School of Physics and Astronomy University of Leeds EC Stoner Building LS2 9JT Leeds UK
| | | |
Collapse
|
23
|
Nikovskii IA, Polezhaev AV, Aleshin DY, Mel’nikova EK, Nelyubina YV. Synthesis and Spin State of the Iron(II) Complex with the N,N'-Disubstituted 2,6-Bis(pyrazol-3-yl)pyridine Ligand. RUSS J COORD CHEM+ 2020. [DOI: 10.1134/s107032842006007x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
24
|
Pankratova Y, Aleshin D, Nikovskiy I, Novikov V, Nelyubina Y. In Situ NMR Search for Spin-Crossover in Heteroleptic Cobalt(II) Complexes. Inorg Chem 2020; 59:7700-7709. [PMID: 32383584 DOI: 10.1021/acs.inorgchem.0c00716] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Here we report the first successful attempt to identify spin-crossover compounds in solutions of metal complexes produced by mixing different ligands and an appropriate metal salt by variable-temperature nuclear magnetic resonance (NMR) spectroscopy. Screening the spin state of a cobalt(II) ion in a series of thus obtained homoleptic and heteroleptic compounds of terpyridines (terpy) and 2,6-bis(pyrazol-3-yl)pyridines (3-bpp) by using this NMR-based approach, which only relies on the temperature behavior of chemical shifts, revealed the first cobalt(II) complexes with a 3-bpp ligand to undergo a thermally induced spin-crossover. A simple analysis of NMR spectra collected from mixtures of different compounds without their isolation or purification required by the current method of choice, the Evans technique, thus emerges as a powerful tool in a search for new spin-crossover compounds and their molecular design boosted by wide possibilities for chemical modifications in heteroleptic complexes.
Collapse
Affiliation(s)
- Yanina Pankratova
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia.,Moscow State University, Leninskie gory, 1, 119991 Moscow, Russia
| | - Dmitry Aleshin
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia.,Mendeleev University of Chemical Technology of Russia, Miusskaya pl., 9, 125047 Moscow, Russia
| | - Igor Nikovskiy
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia
| | - Valentin Novikov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia.,Moscow Institute of Physics and Technology, Institutskiy per., 9, Dolgoprudny 141700, Moscow Region, Russia
| | - Yulia Nelyubina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia
| |
Collapse
|
25
|
Peloquin AJ, Houck MB, McMillen CD, Iacono ST, Pennington WT. Perfluoropyridine as an Efficient, Tunable Scaffold for Bis(pyrazol‐1‐yl)pyridine Copper Complexes. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000150] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Andrew J. Peloquin
- Department of Chemistry Clemson University 219 Hunter Laboratories 29634 Clemson SC USA
| | - Matthew B. Houck
- Department of Chemistry & Chemistry Research Center Laboratories for Advanced Materials United States Air Force Academy 2355 Fairchild Dr., Suite 2N‐225 80840 Colorado Springs CO USA
| | - Colin D. McMillen
- Department of Chemistry Clemson University 219 Hunter Laboratories 29634 Clemson SC USA
| | - Scott T. Iacono
- Department of Chemistry & Chemistry Research Center Laboratories for Advanced Materials United States Air Force Academy 2355 Fairchild Dr., Suite 2N‐225 80840 Colorado Springs CO USA
| | - William T. Pennington
- Department of Chemistry Clemson University 219 Hunter Laboratories 29634 Clemson SC USA
| |
Collapse
|
26
|
Nikovskii IA, Polezhaev AV, Aleshin DY, Mel’nikova EK, Dorovatovskii PV, Nelyubina YV. Iron(II) and Cobalt(II) Complexes with 2,6-Bis(1,4-Diphenyl-5-Hydroxy-1H-Pyrazol-3-yl)pyridine: Synthesis, Structures, and Spin States. RUSS J COORD CHEM+ 2020. [DOI: 10.1134/s1070328420050048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
27
|
Nikovskiy I, Polezhaev A, Novikov V, Aleshin D, Pavlov A, Saffiulina E, Aysin R, Dorovatovskii P, Nodaraki L, Tuna F, Nelyubina Y. Towards the Molecular Design of Spin-Crossover Complexes of 2,6-Bis(pyrazol-3-yl)pyridines. Chemistry 2020; 26:5629-5638. [PMID: 31967374 DOI: 10.1002/chem.202000047] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Indexed: 01/27/2023]
Abstract
The molecular design of spin-crossover complexes relies on controlling the spin state of a transition metal ion by proper chemical modifications of the ligands. Herein, the first N,N'-disubstituted 2,6-bis(pyrazol-3-yl)pyridines (3-bpp) are reported that, against the common wisdom, induce a spin-crossover in otherwise high-spin iron(II) complexes by increasing the steric demand of a bulky substituent, an ortho-functionalized phenyl group. As N,N'-disubstituted 3-bpp complexes have no pendant NH groups that make their spin state extremely sensitive to the environment, the proposed ligand design, which may be applicable to isomeric 1-bpp or other families of popular bi-, tri- and higher denticity ligands, opens the way for their molecular design as spin-crossover compounds for future breakthrough applications.
Collapse
Affiliation(s)
- Igor Nikovskiy
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991, Moscow, Russia
| | - Alexander Polezhaev
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991, Moscow, Russia.,Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005, Moscow, Russia
| | - Valentin Novikov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991, Moscow, Russia.,Moscow Institute of Physics and Technology, Institutskiy per., 9, Dolgoprudny, 141700, Moscow Region, Russia
| | - Dmitry Aleshin
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991, Moscow, Russia.,Mendeleev University of Chemical Technology of Russia, Miusskaya pl., 9, 125047, Moscow, Russia
| | - Alexander Pavlov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991, Moscow, Russia.,Moscow Institute of Physics and Technology, Institutskiy per., 9, Dolgoprudny, 141700, Moscow Region, Russia
| | - Elnara Saffiulina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991, Moscow, Russia.,Mendeleev University of Chemical Technology of Russia, Miusskaya pl., 9, 125047, Moscow, Russia
| | - Rinat Aysin
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991, Moscow, Russia.,Moscow Institute of Physics and Technology, Institutskiy per., 9, Dolgoprudny, 141700, Moscow Region, Russia
| | - Pavel Dorovatovskii
- National Research Centre "Kurchatov Institute", Akademika Kurchatova pl., 1, 123182, Moscow, Russia
| | - Lydia Nodaraki
- University of Manchester, Oxford Rd., Manchester, M13 9PL, UK
| | - Floriana Tuna
- University of Manchester, Oxford Rd., Manchester, M13 9PL, UK
| | - Yulia Nelyubina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991, Moscow, Russia.,Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005, Moscow, Russia
| |
Collapse
|
28
|
Tumanov SV, Veber SL, Tolstikov SE, Artiukhova NA, Ovcharenko VI, Fedin MV. Exchange interactions in photoinduced magnetostructural states of copper( ii)–nitroxide spin dyads. Dalton Trans 2020; 49:5851-5858. [DOI: 10.1039/d0dt00706d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We investigate intra- and intercluster exchange couplings in photoinduced states of copper(ii)–nitroxide based molecular magnets (“breathing crystals”) using variable-temperature EPR spectroscopy.
Collapse
Affiliation(s)
- Sergey V. Tumanov
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
| | - Sergey L. Veber
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
| | | | | | | | - Matvey V. Fedin
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
| |
Collapse
|
29
|
García-López V, Palacios-Corella M, Clemente-León M, Coronado E. Fe(II) spin crossover complexes of a derivative of 2,6-bis(pyrazol-1-yl)pyridine (1-bpp) functionalized with a carboxylic acid in the 3-pyridyl position. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.05.029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
30
|
Halcrow MA, Capel Berdiell I, Pask CM, Kulmaczewski R. Relationship between the Molecular Structure and Switching Temperature in a Library of Spin-Crossover Molecular Materials. Inorg Chem 2019; 58:9811-9821. [PMID: 31335133 DOI: 10.1021/acs.inorgchem.9b00843] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Structure-function relationships relating the spin-crossover (SCO) midpoint temperature (T1/2) in the solid state are surveyed for 43 members of the iron(II) dipyrazolylpyridine family of SCO compounds. The difference between T1/2 in the solid state and in solution [ΔT(latt)] is proposed as a measure of the lattice contribution to the transition temperature. Negative linear correlations between the SCO temperature and the magnitude of the rearrangement of the coordination sphere during SCO are evident among isostructural or near-isostructural subsets of compounds; that is, a larger change in the molecular structure during SCO stabilizes the high-spin state of a material. Improved correlations are often obtained when ΔT(latt), rather than the raw T1/2 value, is considered as the measure of the SCO temperature. Different lattice types show different tendencies to stabilize the high-spin or low-spin state of the molecules they contain, which correlates with the structural changes that most influence ΔT(latt) in each case. These relationships are mostly unaffected by the SCO cooperativity in the compounds or by the involvement of any crystallographic phase changes. One or two materials within each subset are outliers in some or all of these correlations, however, which, in some cases, can be attributed to small differences in their ligand geometry or unusual phase behavior during SCO. A reinvestigation of the structural chemistry of [Fe(3-bpp)2][NCS]2·nH2O [3-bpp = bis(1H-pyrazol-3-yl)pyridine; n = 0 or 2], undertaken as part of this study, is also presented.
Collapse
Affiliation(s)
- Malcolm A Halcrow
- School of Chemistry , University of Leeds , Woodhouse Lane , Leeds LS2 9JT , U.K
| | - Izar Capel Berdiell
- School of Chemistry , University of Leeds , Woodhouse Lane , Leeds LS2 9JT , U.K
| | - Christopher M Pask
- School of Chemistry , University of Leeds , Woodhouse Lane , Leeds LS2 9JT , U.K
| | - Rafal Kulmaczewski
- School of Chemistry , University of Leeds , Woodhouse Lane , Leeds LS2 9JT , U.K
| |
Collapse
|
31
|
Kershaw Cook LJ, Ramsay ML. Ditopic bis-heteroazolylpyridines for construction of fluorescent silver(I) bridged metalloligands. INORG CHEM COMMUN 2019. [DOI: 10.1016/j.inoche.2019.04.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
32
|
Bilayer Thin Films That Combine Luminescent and Spin Crossover Properties for an Efficient and Reversible Fluorescence Switching. MAGNETOCHEMISTRY 2019. [DOI: 10.3390/magnetochemistry5020028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We report on the vacuum thermal deposition of bilayer thin films of the luminescent complex Ir(ppy)3, tris[2-phenylpyridinato-C2,N]iridium(III), and the spin crossover complex [Fe(HB(tz)3)2], bis[hydrotris(1,2,4-triazol-1-yl)borate]iron(II). Switching the spin state of iron ions from the low spin to the high spin state around 337 K leads to a reversible jump of the luminescence intensity, while the spectrum shape and the luminescence lifetime remain unchanged. The luminescence modulation occurs due to the different UV light absorption properties of the iron complex in the two spin states and its magnitude can therefore be precisely adjusted by varying the film thickness. These multilayer luminescence switches hold potential for micro- and nanoscale thermal sensing and imaging applications.
Collapse
|
33
|
Five 2,6-Di(pyrazol-1-yl)pyridine-4-carboxylate Esters, and the Spin States of their Iron(II) Complexes. MAGNETOCHEMISTRY 2019. [DOI: 10.3390/magnetochemistry5010009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Two phenyl ester and three benzyl ester derivatives have been synthesized from 2,6-di(pyrazol-1-yl)pyridine-4-carboxylic acid and the appropriate phenyl or benzyl alcohol using N,N’-dicyclohexylcarbodiimide as the coupling reagent. Complexation of the ligands with Fe[BF4]2·6H2O in acetone yielded the corresponding [FeL2][BF4]2 complex salts. Four of the new ligands and four of the complexes have been crystallographically characterised. Particularly noteworthy are two polymorphs of [Fe(L3)2][BF4]2·2MeNO2 (L3 = 3,4-dimethoxyphenyl 2,6-di{pyrazol-1-yl}pyridine-4-carboxylate), one of which is crystallographically characterised as high-spin while the other exhibits the onset of spin-crossover above room temperature. The other complexes are similarly low-spin at low temperature but exhibit gradual spin-crossover on heating, except for an acetone solvate of [Fe(L5)2][BF4]2 (L5 = benzyl 2,6-di{pyrazol-1-yl}pyridine-4-carboxylate), which exhibits a more abrupt spin-transition at T½ = 273 K with 9 K thermal hysteresis.
Collapse
|
34
|
Weekes RJ, Hawes CS. Synthesis, coordination chemistry and photophysical properties of naphtho-fused pyrazole ligands. CrystEngComm 2019. [DOI: 10.1039/c9ce01074b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The synthesis of two π-extended pyrazole ligands is reported, and their zinc(ii) and copper(ii) complexes are studied spectroscopically and crystallographically, revealing the influence of the fused naphthyl substituent.
Collapse
Affiliation(s)
- Rohan J. Weekes
- School of Chemical and Physical Sciences
- Keele University
- Keele ST5 5BG
- UK
| | - Chris S. Hawes
- School of Chemical and Physical Sciences
- Keele University
- Keele ST5 5BG
- UK
| |
Collapse
|
35
|
Attwood M, Akutsu H, Martin L, Cruickshank D, Turner SS. Above room temperature spin crossover in thioamide-functionalised 2,6-bis(pyrazol-1-yl)pyridine iron(ii) complexes. Dalton Trans 2018; 48:90-98. [PMID: 30456406 DOI: 10.1039/c8dt03240h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This work describes the synthesis of two novel functionalised 2,6-bis(pyrazol-1-yl)pyridine (bpp) ligands, namely 2,6-bis(pyrazol-1-yl)pyridine-4-carbothioamide (bppCSNH2) and N-methyl-2,6-bis(pyrazol-1-yl)pyridine-4-carbothioamide (bppCSNHMe). The corresponding solvated or non-solvated Fe(ii) salts, [Fe(bppCSNH2)2]X2 and [Fe(bppCSNHMe)2]X2 (X = BF4- or ClO4-) were synthesised and their properties measured by SQUID magnetometry, Evans NMR, differential scanning calorimetry and single crystal X-ray diffraction. In the solid state [Fe(bppCSNH2)2]2+ salts persist in the low spin state below 350 K. The structure of [Fe(bppCSNH2)2](BF4)2·2MeNO2 shows a network of intermolecular interactions responsible for the low spin state stabilisation, relative to the prototypical [Fe(bpp)2]2+ spin crossover (SCO) salts. By contrast the complexes of bppCSNHMe both display abrupt SCO above 300 K. [Fe(bppCSNHMe)2](BF4)2·MeNO2 requires solvent loss before SCO can be observed centred at 332 K. The non-solvated [Fe(bppCSNHMe)2](ClO4)2 shows SCO centred at 325 K. Analysis of solvated and non-solvated crystal structures suggests that cooperativity is facilitated by thioamide-group interactions with neighbouring pyrazolyl and pyridyl moieties.
Collapse
Affiliation(s)
- Max Attwood
- Department of Chemistry, University of Surrey, Guildford, GU2 7XH, UK.
| | | | | | | | | |
Collapse
|
36
|
|
37
|
Delgado T, Meneses-Sánchez M, Piñeiro-López L, Bartual-Murgui C, Muñoz MC, Real JA. Thermo- and photo-modulation of exciplex fluorescence in a 3D spin crossover Hofmann-type coordination polymer. Chem Sci 2018; 9:8446-8452. [PMID: 30542594 PMCID: PMC6247521 DOI: 10.1039/c8sc02677g] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 09/07/2018] [Indexed: 12/20/2022] Open
Abstract
The search for bifunctional materials showing synergies between spin crossover (SCO) and luminescence has attracted substantial interest since they could be promising platforms for new switching electronic and optical technologies. In this context, we present the first three-dimensional FeII Hofmann-type coordination polymer exhibiting SCO properties and luminescence. The complex {FeII(bpben)[Au(CN)2]}@pyr (bpben = 1,4-bis(4-pyridyl)benzene) functionalized with pyrene (pyr) guests undergoes a cooperative multi-step SCO, which has been investigated by single crystal X-ray diffraction, single crystal UV-Vis absorption spectroscopy, and magnetic and calorimetric measurements. The resulting fluorescence from pyrene and exciplex emissions are controlled by the thermal and light irradiation (LIESST effect) dependence of the high/low-spin state population of FeII. Conversely, the SCO can be tracked by monitoring the fluorescence emission. This ON-OFF interplay between SCO and luminescence combined with the amenability of Hofmann-type materials to be processed at the nano-scale may be relevant for the generation of SCO-based sensors, actuators and spintronic devices.
Collapse
Affiliation(s)
- Teresa Delgado
- Départment de Chimie Physique , Université de Genève , Rue Ernest Ansermet, 30 , 1211 Genève , Switzerland
| | - Manuel Meneses-Sánchez
- Departament de Química Inorgánica , Institut de Ciència Molecular (ICMol) , Universitat de València , Catedrático José Beltrán Martínez, 2 , 46980 Paterna , Spain
| | - Lucía Piñeiro-López
- Departament de Química Inorgánica , Institut de Ciència Molecular (ICMol) , Universitat de València , Catedrático José Beltrán Martínez, 2 , 46980 Paterna , Spain
| | - Carlos Bartual-Murgui
- Departament de Química Inorgánica , Institut de Ciència Molecular (ICMol) , Universitat de València , Catedrático José Beltrán Martínez, 2 , 46980 Paterna , Spain
| | - M Carmen Muñoz
- Departamento de Física Aplicada , Universitat Politècnica de València , Camino de Vera s/n , 46022 Valencia , Spain
| | - José Antonio Real
- Departament de Química Inorgánica , Institut de Ciència Molecular (ICMol) , Universitat de València , Catedrático José Beltrán Martínez, 2 , 46980 Paterna , Spain
| |
Collapse
|
38
|
Galadzhun I, Kulmaczewski R, Cespedes O, Yamada M, Yoshinari N, Konno T, Halcrow MA. 2,6-Bis(pyrazol-1-yl)pyridine-4-carboxylate Esters with Alkyl Chain Substituents and Their Iron(II) Complexes. Inorg Chem 2018; 57:13761-13771. [DOI: 10.1021/acs.inorgchem.8b02289] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Iurii Galadzhun
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
| | - Rafal Kulmaczewski
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
| | - Oscar Cespedes
- School of Physics and Astronomy, University of Leeds, E. C. Stoner Building, Leeds LS2 9JT, U.K
| | - Mihoko Yamada
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Nobuto Yoshinari
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Takumi Konno
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Malcolm A. Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
| |
Collapse
|
39
|
Wang CF, Yang GY, Yao ZS, Tao J. Monitoring the Spin States of Ferrous Ions by Fluorescence Spectroscopy in Spin-Crossover-Fluorescent Hybrid Materials. Chemistry 2018; 24:3218-3224. [DOI: 10.1002/chem.201704901] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Chun-Feng Wang
- Key Laboratory of Cluster Science of Ministry of Education; School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 100081 P.R. China
| | - Guo-Yu Yang
- Key Laboratory of Cluster Science of Ministry of Education; School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 100081 P.R. China
| | - Zi-Shuo Yao
- Key Laboratory of Cluster Science of Ministry of Education; School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 100081 P.R. China
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education; School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 100081 P.R. China
| |
Collapse
|
40
|
Feltham HLC, Dankhoff K, Meledandri CJ, Brooker S. Towards Dual-Functionality Spin-Crossover Complexes. Chempluschem 2018; 83:582-589. [DOI: 10.1002/cplu.201700512] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 01/09/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Humphrey L. C. Feltham
- Department of Chemistry; University of Otago; MacDiarmid Institute for Advanced Materials and Nanotechnology; PO Box 56 Dunedin 9054 New Zealand
| | - Katja Dankhoff
- Department of Chemistry; University of Otago; MacDiarmid Institute for Advanced Materials and Nanotechnology; PO Box 56 Dunedin 9054 New Zealand
- Current address: Inorganic Chemistry II, Department of Chemistry; University of Bayreuth; Universitätstrasse 30 Bayreuth 95447 Germany
| | - Carla J. Meledandri
- Department of Chemistry; University of Otago; MacDiarmid Institute for Advanced Materials and Nanotechnology; PO Box 56 Dunedin 9054 New Zealand
| | - Sally Brooker
- Department of Chemistry; University of Otago; MacDiarmid Institute for Advanced Materials and Nanotechnology; PO Box 56 Dunedin 9054 New Zealand
| |
Collapse
|
41
|
Kurz H, Lochenie C, Wagner KG, Schneider S, Karg M, Weber B. Synthesis and Optical Properties of Phenanthroline-Derived Schiff Base-Like Dinuclear RuII-NiIIComplexes. Chemistry 2018; 24:5100-5111. [DOI: 10.1002/chem.201704632] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Hannah Kurz
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
| | - Charles Lochenie
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Sciences et d'Ingénierie Supramoléculaires; Université de Strasbourg; 67083 Strasbourg Cedex France
| | - Kristina G. Wagner
- Physikalische Chemie I; Heinrich-Heine-Universität Düsseldorf; 40204 Düsseldorf Germany
| | - Sandra Schneider
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
| | - Matthias Karg
- Physikalische Chemie I; Heinrich-Heine-Universität Düsseldorf; 40204 Düsseldorf Germany
| | - Birgit Weber
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
| |
Collapse
|
42
|
Lochenie C, Schötz K, Panzer F, Kurz H, Maier B, Puchtler F, Agarwal S, Köhler A, Weber B. Spin-Crossover Iron(II) Coordination Polymer with Fluorescent Properties: Correlation between Emission Properties and Spin State. J Am Chem Soc 2018; 140:700-709. [PMID: 29251919 DOI: 10.1021/jacs.7b10571] [Citation(s) in RCA: 129] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A spin-crossover coordination polymer [Fe(L1)(bipy)]n (where L = a N2O22- coordinating Schiff base-like ligand bearing a phenazine fluorophore and bipy = 4,4'-bipyridine) was synthesized and exhibits a 48 K wide thermal hysteresis above room temperature (T1/2↑ = 371 K and T1/2↓ = 323 K) that is stable for several cycles. The spin transition was characterized using magnetic measurements, Mössbauer spectroscopy, and DSC measurements. T-dependent X-ray powder diffraction reveals a structural phase transition coupled with the spin transition phenomenon. The dimeric excerpt {(μ-bipy)[FeL1(MeOH)]2}·2MeOH of the coordination polymer chain crystallizes in the triclinic space group P1̅ and reveals that the packing of the molecules in the crystal is dominated by hydrogen bonds. Investigation of the emission properties of the complexes with regard to temperature shows that the spin crossover can be tracked by monitoring the emission spectra, since the emission color changes from greenish to a yellow color upon the low spin-to-high spin transition.
Collapse
Affiliation(s)
- Charles Lochenie
- Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Konstantin Schötz
- Experimental Physics II and Bayreuth Institute of Macromolecular Research (BMBF) Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Fabian Panzer
- Experimental Physics II and Bayreuth Institute of Macromolecular Research (BMBF) Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Hannah Kurz
- Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Bernadette Maier
- Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Florian Puchtler
- Inorganic Chemistry I, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Seema Agarwal
- Macromolecular Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Anna Köhler
- Experimental Physics II and Bayreuth Institute of Macromolecular Research (BMBF) Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Birgit Weber
- Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| |
Collapse
|
43
|
Attwood M, Turner SS. Back to back 2,6-bis(pyrazol-1-yl)pyridine and 2,2′:6′,2″-terpyridine ligands: Untapped potential for spin crossover research and beyond. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.09.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
44
|
Senthil Kumar K, Ruben M. Emerging trends in spin crossover (SCO) based functional materials and devices. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.024] [Citation(s) in RCA: 503] [Impact Index Per Article: 71.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
45
|
Capel Berdiell I, Kulmaczewski R, Halcrow MA. Iron(II) Complexes of 2,4-Dipyrazolyl-1,3,5-triazine Derivatives-The Influence of Ligand Geometry on Metal Ion Spin State. Inorg Chem 2017; 56:8817-8828. [PMID: 28699741 DOI: 10.1021/acs.inorgchem.7b00699] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Seven [FeL2][BF4]2 complex salts were prepared, where L is a 6-substituted 2,4-di(pyrazol-1-yl)-1,3,5-triazine (bpt) derivative. The complexes are all crystallographically high-spin, and exhibit significant distortions from an ideal D2d-symmetric coordination geometry. In one case, an unusual type of metal ion disorder was observed among a cubic array of ligands in the crystal lattice. The complexes are also high-spin between 3 and 300 K in the solid state and, where measured, between 239 and 333 K in CD3CN solution. This result is unexpected, since homoleptic iron(II) complexes of related 2,6-di(pyrazol-1-yl)pyridine, 2,6-di(pyrazol-1-yl)pyrazine, and 2,6-di(pyrazol-1-yl)pyrimidine derivatives often exhibit thermal spin-crossover behavior. Gas-phase density functional theory calculations confirm the high-spin form of [Fe(bpt)2]2+ and its derivatives is stabilized relative to iron(II) complexes of the other ligand types. This reflects a weaker Fe/pyrazolyl σ-bonding interaction, which we attribute to a small narrowing of the chelate ligand bite angle associated with the geometry of the 1,3,5-triazinyl ring. Hence, the high-spin state of [Fe(bpt)2]2+ centers does not reflect the electronic properties of its heterocyclic ligand donors but is imposed by the bpt ligand conformation. A high-spin homoleptic iron(III) complex of one of the bpt derivatives was also synthesized.
Collapse
Affiliation(s)
- Izar Capel Berdiell
- School of Chemistry, University of Leeds , Woodhouse Lane, Leeds LS2 9JT, U.K
| | - Rafal Kulmaczewski
- School of Chemistry, University of Leeds , Woodhouse Lane, Leeds LS2 9JT, U.K
| | - Malcolm A Halcrow
- School of Chemistry, University of Leeds , Woodhouse Lane, Leeds LS2 9JT, U.K
| |
Collapse
|
46
|
Suleimanov I, Molnár G, Salmon L, Bousseksou A. Near‐Infrared Luminescence Switching in a Spin‐Crossover Polymer Nanocomposite. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700426] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Iurii Suleimanov
- LCC CNRS and Université de Toulouse UPS, INP 31077 Toulouse France
| | - Gábor Molnár
- LCC CNRS and Université de Toulouse UPS, INP 31077 Toulouse France
| | - Lionel Salmon
- LCC CNRS and Université de Toulouse UPS, INP 31077 Toulouse France
| | | |
Collapse
|
47
|
Han WK, Qin LF, Pang CY, Cheng CK, Zhu W, Li ZH, Li Z, Ren X, Gu ZG. Polymorphism of a chiral iron(ii) complex: spin-crossover and ferroelectric properties. Dalton Trans 2017; 46:8004-8008. [DOI: 10.1039/c7dt01634d] [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
A chiral iron(ii) complex with two polymorphs, one that undergoes a gradual spin crossover, whilst the other remains in a high-spin state but shows a typical ferroelectric feature, is reported.
Collapse
Affiliation(s)
- Wang-Kang Han
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Long-Fang Qin
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Chun-Yan Pang
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Cai-Kun Cheng
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Wei Zhu
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Zhi-Hua Li
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Zaijun Li
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Xuehong Ren
- The Key Laboratory of Eco-textiles of Ministry of Education
- College of Textiles and Clothing
- Jiangnan University
- Wuxi 214122
- P.R. China
| | - Zhi-Guo Gu
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| |
Collapse
|
48
|
Bushuev MB, Nikolaenkova EB, Krivopalov VP. Non-isothermal kinetics of spin crossover. Phys Chem Chem Phys 2017. [DOI: 10.1039/c7cp03442c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Non-isothermal magnetic studies can be used to estimate the activation energy of cooperative spin transition.
Collapse
Affiliation(s)
- Mark B. Bushuev
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch of Russian Academy of Sciences
- Novosibirsk
- Russia
- Novosibirsk State University
| | - Elena B. Nikolaenkova
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry
- Siberian Branch of Russian Academy of Sciences
- Novosibirsk
- Russia
| | - Viktor P. Krivopalov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry
- Siberian Branch of Russian Academy of Sciences
- Novosibirsk
- Russia
| |
Collapse
|
49
|
Rat S, Ridier K, Vendier L, Molnár G, Salmon L, Bousseksou A. Solvatomorphism and structural-spin crossover property relationship in bis[hydrotris(1,2,4-triazol-1-yl)borate]iron(ii). CrystEngComm 2017. [DOI: 10.1039/c7ce00741h] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
50
|
Strohecker DJ, Lynch VM, Holliday BJ, Jones RA. Synthesis and electronic investigation of mono- and di-substituted 4-nitro- and 4-amino-pyrazol-1-yl bis(pyrazol-1-yl)pyridine-type ligands and luminescent Eu(iii) derivatives. Dalton Trans 2017; 46:7733-7742. [DOI: 10.1039/c7dt01153a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of nitro- and amino-bis(pyrazol-1-yl)pyridines was achieved, allowing for tuning of frontier orbital energies and Eu(iii) complex spectroscopic investigations.
Collapse
Affiliation(s)
- D. J. Strohecker
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | - V. M. Lynch
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | | | - R. A. Jones
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| |
Collapse
|