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Wellm V, Näther C, Herges R. Molecular Spin State Switching and Photochromism in the Red and Near Infrared with Ni(II) Chlorin and Ni(II) Bacteriochlorin. J Org Chem 2021; 86:9503-9514. [PMID: 34181424 DOI: 10.1021/acs.joc.1c00806] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Molecules or ions are either paramagnetic (unpaired electrons) or diamagnetic (all electrons are paired). Switching between the two states under ambient conditions was considered a typical solid state phenomenon and has been termed spin crossover. The first single-molecule spin state switches operated with light in solution were developed a decade ago and offer a number of technical applications that are not accessible to solid state systems. Magnetic switching in biological environments, however, requires water solubility, and for in vivo applications, switching wavelengths within the bio-optical window (650-950 nm) are needed. We now present molecular spin state switches that are water-soluble and switchable in the far-red and near-infrared region. At the same time, they are photochromic compounds with excellent photophysical properties. trans-cis isomerization is induced with 505 nm radiation, and cis-trans conversion with 620 or 720 nm radiation. The metastable cis isomers are stable at room temperature for at least several weeks. The detailed mechanism of this surprising and unprecedented long wavelength photoisomerization of azobenzenes is still under investigation.
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Affiliation(s)
- Vanessa Wellm
- Otto Diels-Institute of Organic Chemistry, University of Kiel, Otto-Hahn-Platz 4, Kiel D-24118, Germany
| | - Christian Näther
- Institute of Inorganic Chemistry, University of Kiel, Max-Eyth-Straße 2, Kiel D-24118, Germany
| | - Rainer Herges
- Otto Diels-Institute of Organic Chemistry, University of Kiel, Otto-Hahn-Platz 4, Kiel D-24118, Germany
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Scheurer M, Dreuw A, Epifanovsky E, Head-Gordon M, Stauch T. Modeling Molecules under Pressure with Gaussian Potentials. J Chem Theory Comput 2021; 17:583-597. [PMID: 33350311 DOI: 10.1021/acs.jctc.0c01212] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The computational modeling of molecules under high pressure is a growing research area that augments experimental high-pressure chemistry. Here, a new electronic structure method for modeling atoms and molecules under pressure, Gaussians On Surface Tesserae Simulate HYdrostatic Pressure (GOSTSHYP) approach, is introduced. In this method, a set of Gaussian potentials is distributed evenly on the van der Waals surface of the investigated chemical system, leading to a compression of the electron density and the atomic scaffold. Since no parameters other than pressure need to be specified, GOSTSHYP allows straightforward geometry optimizations and ab initio molecular dynamics simulations of chemical systems under pressure for nonexpert users. Calculated energies, bond lengths, and dipole moments under pressure fall within the range of established computational methods for high-pressure chemistry. A Diels-Alder reaction and the cyclotrimerization of acetylene showcase the ability of GOSTSHYP to model pressure-induced chemical reactions. The connection to mechanochemistry is pointed out.
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Affiliation(s)
- Maximilian Scheurer
- Interdisciplinary Center for Scientific Computing, Heidelberg University, D-69120 Heidelberg, Germany
| | - Andreas Dreuw
- Interdisciplinary Center for Scientific Computing, Heidelberg University, D-69120 Heidelberg, Germany
| | - Evgeny Epifanovsky
- Q-Chem Inc., 6601 Owens Dr, Suite 105, Pleasanton, California 94588, United States
| | - Martin Head-Gordon
- Pitzer Center for Theoretical Chemistry, University of California, Berkeley, South Dr, Berkeley, California 94720, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720, United States
| | - Tim Stauch
- Institute for Physical and Theoretical Chemistry, University of Bremen, Leobener Str. NW2, D-28359 Bremen, Germany.,Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, D-28359 Bremen, Germany.,MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstr. 1, D-28359 Bremen, Germany
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Photoinduced Mo−CN Bond Breakage in Octacyanomolybdate Leading to Spin Triplet Trapping. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914527] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Qi X, Pillet S, de Graaf C, Magott M, Bendeif EE, Guionneau P, Rouzières M, Marvaud V, Stefańczyk O, Pinkowicz D, Mathonière C. Photoinduced Mo-CN Bond Breakage in Octacyanomolybdate Leading to Spin Triplet Trapping. Angew Chem Int Ed Engl 2020; 59:3117-3121. [PMID: 31793123 DOI: 10.1002/anie.201914527] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Indexed: 01/30/2023]
Abstract
The photoinduced properties of the octacoordinated complex K4 MoIV (CN)8 ⋅2 H2 O were studied by theoretical calculations, crystallography, and optical and magnetic measurements. The crystal structure recorded at 10 K after blue light irradiation reveals an heptacoordinated Mo(CN)7 species originating from the light-induced cleavage of one Mo-CN bond, concomitant with the photoinduced formation of a paramagnetic signal. When this complex is heated to 70 K, it returns to its original diamagnetic ground state, demonstrating full reversibility. The photomagnetic properties show a partial conversion into a triplet state possessing significant magnetic anisotropy, which is in agreement with theoretical studies. Inspired by these results, we isolated the new compound [K(crypt-222)]3 [MoIV (CN)7 ]⋅3 CH3 CN using a photochemical pathway, confirming that photodissociation leads to a stable heptacyanomolybdate(IV) species in solution.
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Affiliation(s)
- Xinghui Qi
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600, Pessac, France
| | - Sébastien Pillet
- Université de Lorraine, CNRS, CRM2, Nancy, 54506, Vandoeuvre-les-Nancy, France
| | - Coen de Graaf
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Carrer Marcellí Domingo 1, Tarragona, Spain.,ICREA, Passeig Lluís Companys 23, Barcelona, 08010, Spain
| | - Michał Magott
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387, Kraków, Poland
| | - El-Eulmi Bendeif
- Université de Lorraine, CNRS, CRM2, Nancy, 54506, Vandoeuvre-les-Nancy, France
| | - Philippe Guionneau
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600, Pessac, France
| | | | - Valérie Marvaud
- Sorbonne Université, IPCM-CNRS-UMR-8232, cc 229, 4 place Jussieu, 75252, Paris Cedex 05, France
| | - Olaf Stefańczyk
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600, Pessac, France.,Present address: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Dawid Pinkowicz
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387, Kraków, Poland
| | - Corine Mathonière
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600, Pessac, France
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Megow S, Fitschen HL, Tuczek F, Temps F. Ultrafast Photodynamics of an Azopyridine-Functionalized Iron(II) Complex: Implications for the Concept of Ligand-Driven Light-Induced Spin Change. J Phys Chem Lett 2019; 10:6048-6054. [PMID: 31549841 DOI: 10.1021/acs.jpclett.9b02083] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report on the ultrafast photodynamics of an iron(II) complex with a photoisomerizable pentadentate azo-tetrapyridylamino ligand after irradiation with ultraviolet light. The results of femtosecond transient electronic absorption spectroscopy performed on the low-spin (LS) form of the title complex show that initial excitation of the ππ* state of the azopyridine unit in the ligand at λpump = 312 nm is followed by an ultrafast intersystem crossing (ISC) that leads to the formation of a metal-centered (MC) 5T state, in competition with the intended photoswitching of the azopyridine unit. Additional measurements carried out upon excitation of the singlet metal-to-ligand charge-transfer (1MLCT) transition at λpump = 455 nm suggest that this energy transfer occurs via an MLCT state. The resulting high-spin (HS) 5T state of the complex is metastable and recovers to the LS ground state with a time constant of ∼3 ns. The implications of these observations on the ligand-driven light-induced spin change concept are discussed.
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Affiliation(s)
- Sebastian Megow
- Institut für Physikalische Chemie , Christian-Albrechts-Universität , Olshausenstrasse 40 , 24098 Kiel , Germany
| | - Henrike-Leonie Fitschen
- Institut für Anorganische Chemie , Christian-Albrechts-Universität , Olshausenstrasse 40 , 24098 Kiel , Germany
| | - Felix Tuczek
- Institut für Anorganische Chemie , Christian-Albrechts-Universität , Olshausenstrasse 40 , 24098 Kiel , Germany
| | - Friedrich Temps
- Institut für Physikalische Chemie , Christian-Albrechts-Universität , Olshausenstrasse 40 , 24098 Kiel , Germany
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Milek M, Heinemann FW, Khusniyarov MM. Spin Crossover Meets Diarylethenes: Efficient Photoswitching of Magnetic Properties in Solution at Room Temperature. Inorg Chem 2013; 52:11585-92. [DOI: 10.1021/ic401960x] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Magdalena Milek
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen−Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
| | - Frank W. Heinemann
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen−Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
| | - Marat M. Khusniyarov
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen−Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
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Förster C, Mack K, Carrella LM, Ksenofontov V, Rentschler E, Heinze K. Coordination of expanded terpyridine ligands to cobalt. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.08.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Hayami S, Karim MR, Lee YH. Magnetic Behavior and Liquid-Crystal Properties in Spin-Crossover Cobalt(II) Compounds with Long Alkyl Chains. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201107] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Boillot ML, Zarembowitch J, Sour A. Ligand-Driven Light-Induced Spin Change (LD-LISC): A Promising Photomagnetic Effect. Top Curr Chem (Cham) 2012. [DOI: 10.1007/b95419] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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12
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Guionneau P, Marchivie M, Bravic G, Létard JF, Chasseau D. Structural Aspects of Spin Crossover. Example of the [FeIILn(NCS)2] Complexes. Top Curr Chem (Cham) 2012. [DOI: 10.1007/b95414] [Citation(s) in RCA: 376] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Mokdad A, Belof JL, Yi SW, Shuler SE, McLaughlin ML, Space B, Larsen RW. Photophysical Studies of the Trans to Cis Isomerization of the Push−Pull Molecule: 1-(Pyridin-4-yl)-2-(N-methylpyrrol-2-yl)ethene (mepepy). J Phys Chem A 2008; 112:8310-5. [DOI: 10.1021/jp803268r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Audrey Mokdad
- Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - Jonathan L. Belof
- Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - Sung Wook Yi
- Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - Stephen E. Shuler
- Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - Mark L. McLaughlin
- Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - Brian Space
- Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - Randy W. Larsen
- Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
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Varret F, Salunke SA, Boukheddaden K, Bousseksou A, Codjovi É, Enachescu C, Linares J. The Ising-like model applied to switchable inorganic solids: discussion of the static properties. CR CHIM 2003. [DOI: 10.1016/s1631-0748(03)00048-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Jaiswal A, Floquet S, Boillot ML, Delhaès P. A comparative investigation of spin crossover in bulk materials, lamellar CdPS3 layers, and polyelectrolytes in a series of ferric complexes: [FeIII((X-sal)2trien)]Y. Chemphyschem 2002; 3:1045-9. [PMID: 12516218 DOI: 10.1002/cphc.200290009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Archana Jaiswal
- Centre de Recherche Paul Pascal CNRS-Université de Bordeaux I 115 Av. Albert Schweitzer, 33600 Pessac, France.
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Hirose S, Hayami S, Maeda Y. Magnetic Properties of Iron(III) Complexes with Photoisomerizable Ligands. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2000. [DOI: 10.1246/bcsj.73.2059] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ksenofontov V, Levchenko G, Spiering H, Gütlich P, Létard JF, Bouhedja Y, Kahn O. Spin crossover behavior under pressure of Fe(PM-L)2(NCS)2 compounds with substituted 2′-pyridylmethylene 4-anilino ligands. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)00901-4] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Boillot ML, Roux C, Audière JP, Dausse A, Zarembowitch J. Ligand-Driven Light-Induced Spin Change in Transition-Metal Complexes: Selection of an Appropriate System and First Evidence of the Effect, in Fe(II)(4-styrylpyridine)(4)(NCBPh(3))(2). Inorg Chem 1996; 35:3975-3980. [PMID: 11666592 DOI: 10.1021/ic960015r] [Citation(s) in RCA: 101] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first observation of a ligand-driven light-induced spin-state change (LD-LISC effect) in a transition-metal complex is reported. The compounds under investigation are of the type Fe(II)L(4)X(2), where L is a cis/trans photoisomerizable ligand. For an iron(II) spin-state change to result from ligand cis <--> trans conversion, the Fe(II)(trans-L)(4)X(2) species had to exhibit a thermally-induced high-spin state <--> low-spin state crossover. This property was checked by variable-temperature magnetic susceptibility measurements, for compounds with X(-) = NCBPh(3)(-) or NCBH(3)(-) and L = 1-phenyl-2-(4-pyridyl)ethene (or 4-styrylpyridine, abbreviated as Stpy), 1-(4-R-phenyl)-2-(4-pyridyl)ethene (R = CH(3), COOCH(3)), or 1-(1-naphthyl)-2-(4-pyridyl)ethene. The results are comparatively discussed. The best candidate for the LD-LISC effect to be observed is found to be Fe(Stpy)(4)(NCBPh(3))(2): the complex (C(t)) formed with trans-Stpy undergoes a thermally-induced spin crossover centered around 190 K; the one (C(c)) formed with cis-Stpy retains the high-spin state at any temperature. Photoisomerization of the Stpy ligand, at 140 K, in the complex embedded within a cellulose acetate matrix, is effectively shown, on the basis of UV-vis absorption measurements, to trigger the spin-state change of the iron(II) ions.
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Affiliation(s)
- Marie-Laure Boillot
- Laboratoire de Chimie Inorganique (CNRS, URA 420), Université Paris-Sud, 91405 Orsay, France
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Real JA, Andrés E, Muñoz MC, Julve M, Granier T, Bousseksou A, Varret F. Spin Crossover in a Catenane Supramolecular System. Science 1995; 268:265-7. [PMID: 17814788 DOI: 10.1126/science.268.5208.265] [Citation(s) in RCA: 450] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The compound [Fe(tvp)(2)(NCS)(2)] . CH(3)OH, where tvp is 1,2-di-(4-pyridyl)-ethylene, has been synthesized and characterized by x-ray single-crystal diffraction. It consists of two perpendicular, two-dimensional networks organized in parallel stacks of sheets made up of edge-shared [Fe(II)](4) rhombuses. The fully interlocked networks define large square channels in the [001] direction. Variable-temperature magnetic susceptibility measurements and Mössbauer studies reveal that this compound shows low-spin to high-spin crossover behavior in the temperature range from 100 to 250 kelvin. The combined structural and magnetic characterization of this kind of compound is fundamental for the interpretation of the mechanism leading to the spin crossover, which is important in the development of electronic devices such as molecular switches.
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Bolvin H, Kahn O. Ising model for low-spin high-spin transitions in molecular compounds; within and beyond the mean-field approximation. Chem Phys 1995. [DOI: 10.1016/0301-0104(94)00409-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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