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Journal articles on the topic 'Spin-crossover'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 April 2025

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1

Delgado, Teresa, and Mélanie Villard. "Spin Crossover Nanoparticles." Journal of Chemical Education 99, no. 2 (January 19, 2022): 1026–35. http://dx.doi.org/10.1021/acs.jchemed.1c00990.

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2

Takahashi, Kazuyuki. "Spin-Crossover Complexes." Inorganics 6, no. 1 (March 1, 2018): 32. http://dx.doi.org/10.3390/inorganics6010032.

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3

Murray, Keith S., Hiroki Oshio, and José Antonio Real. "Spin-Crossover Complexes." European Journal of Inorganic Chemistry 2013, no. 5-6 (February 18, 2013): 577–80. http://dx.doi.org/10.1002/ejic.201300062.

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4

Yazdani, Saeed, Jared Phillips, Thilini K. Ekanayaka, Ruihua Cheng, and Peter A. Dowben. "The Influence of the Substrate on the Functionality of Spin Crossover Molecular Materials." Molecules 28, no. 9 (April 26, 2023): 3735. http://dx.doi.org/10.3390/molecules28093735.

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Spin crossover complexes are a route toward designing molecular devices with a facile readout due to the change in conductance that accompanies the change in spin state. Because substrate effects are important for any molecular device, there are increased efforts to characterize the influence of the substrate on the spin state transition. Several classes of spin crossover molecules deposited on different types of surface, including metallic and non-metallic substrates, are comprehensively reviewed here. While some non-metallic substrates like graphite seem to be promising from experimental measurements, theoretical and experimental studies indicate that 2D semiconductor surfaces will have minimum interaction with spin crossover molecules. Most metallic substrates, such as Au and Cu, tend to suppress changes in spin state and affect the spin state switching process due to the interaction at the molecule–substrate interface that lock spin crossover molecules in a particular spin state or mixed spin state. Of course, the influence of the substrate on a spin crossover thin film depends on the molecular film thickness and perhaps the method used to deposit the molecular film.
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5

Gütlich, Philipp, Ana B. Gaspar, and Yann Garcia. "Spin state switching in iron coordination compounds." Beilstein Journal of Organic Chemistry 9 (February 15, 2013): 342–91. http://dx.doi.org/10.3762/bjoc.9.39.

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The article deals with coordination compounds of iron(II) that may exhibit thermally induced spin transition, known as spin crossover, depending on the nature of the coordinating ligand sphere. Spin transition in such compounds also occurs under pressure and irradiation with light. The spin states involved have different magnetic and optical properties suitable for their detection and characterization. Spin crossover compounds, though known for more than eight decades, have become most attractive in recent years and are extensively studied by chemists and physicists. The switching properties make such materials potential candidates for practical applications in thermal and pressure sensors as well as optical devices. The article begins with a brief description of the principle of molecular spin state switching using simple concepts of ligand field theory. Conditions to be fulfilled in order to observe spin crossover will be explained and general remarks regarding the chemical nature that is important for the occurrence of spin crossover will be made. A subsequent section describes the molecular consequences of spin crossover and the variety of physical techniques usually applied for their characterization. The effects of light irradiation (LIESST) and application of pressure are subjects of two separate sections. The major part of this account concentrates on selected spin crossover compounds of iron(II), with particular emphasis on the chemical and physical influences on the spin crossover behavior. The vast variety of compounds exhibiting this fascinating switching phenomenon encompasses mono-, oligo- and polynuclear iron(II) complexes and cages, polymeric 1D, 2D and 3D systems, nanomaterials, and polyfunctional materials that combine spin crossover with another physical or chemical property.
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6

Hao, Hua, Ting Jia, Xiaohong Zheng, and Zhi Zeng. "Bias induced spin transitions of spin crossover molecules: the role of charging effect." Physical Chemistry Chemical Physics 19, no. 11 (2017): 7652–58. http://dx.doi.org/10.1039/c6cp08265c.

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A new mechanism is proposed to understand the recently observed spin transition of spin crossover molecules from low spin to high spin under bias voltages and it is closely related to one additional electron on the spin crossover molecules.
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7

Wu, Wei-Wei, Si-Guo Wu, Yan-Cong Chen, Guo-Zhang Huang, Bang-Heng Lyu, Zhao-Ping Ni, and Ming-Liang Tong. "Spin-crossover in an organic–inorganic hybrid perovskite." Chemical Communications 56, no. 33 (2020): 4551–54. http://dx.doi.org/10.1039/d0cc00992j.

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The first spin-crossover complex with an organic–inorganic hybrid perovskite structure is reported, which displays three-step spin-crossover, light-induced excited spin-state trapping and spin-state dependent fluorescence properties.
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8

Mukherjee, Saikat, Dmitry A. Fedorov, and Sergey A. Varganov. "Modeling Spin-Crossover Dynamics." Annual Review of Physical Chemistry 72, no. 1 (April 20, 2021): 515–40. http://dx.doi.org/10.1146/annurev-physchem-101419-012625.

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In this article, we review nonadiabatic molecular dynamics (NAMD) methods for modeling spin-crossover transitions. First, we discuss different representations of electronic states employed in the grid-based and direct NAMD simulations. The nature of interstate couplings in different representations is highlighted, with the main focus on nonadiabatic and spin-orbit couplings. Second, we describe three NAMD methods that have been used to simulate spin-crossover dynamics, including trajectory surface hopping, ab initio multiple spawning, and multiconfiguration time-dependent Hartree. Some aspects of employing different electronic structure methods to obtain information about potential energy surfaces and interstate couplings for NAMD simulations are also discussed. Third, representative applications of NAMD to spin crossovers in molecular systems of different sizes and complexities are highlighted. Finally, we pose several fundamental questions related to spin-dependent processes. These questions should be possible to address with future methodological developments in NAMD.
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9

Quintero, Carlos M., Gautier Félix, Iurii Suleimanov, José Sánchez Costa, Gábor Molnár, Lionel Salmon, William Nicolazzi, and Azzedine Bousseksou. "Hybrid spin-crossover nanostructures." Beilstein Journal of Nanotechnology 5 (November 25, 2014): 2230–39. http://dx.doi.org/10.3762/bjnano.5.232.

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This review reports on the recent progress in the synthesis, modelling and application of hybrid spin-crossover materials, including core–shell nanoparticles and multilayer thin films or nanopatterns. These systems combine, often in synergy, different physical properties (optical, magnetic, mechanical and electrical) of their constituents with the switching properties of spin-crossover complexes, providing access to materials with unprecedented capabilities.
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10

Maciążek, E., T. Groń, A. W. Pacyna, T. Mydlarz, B. Zawisza, and J. Krok-Kowalski. "Spin Crossover in CuxCoyCrzSe4Semiconductors." Acta Physica Polonica A 119, no. 5 (May 2011): 711–13. http://dx.doi.org/10.12693/aphyspola.119.711.

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11

Volatron, Florence, Laure Catala, Eric Rivière, Alexandre Gloter, Odile Stéphan, and Talal Mallah. "Spin-Crossover Coordination Nanoparticles." Inorganic Chemistry 47, no. 15 (August 2008): 6584–86. http://dx.doi.org/10.1021/ic800803w.

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12

Kahn, Olivier. "Spin-crossover molecular materials." Current Opinion in Solid State and Materials Science 1, no. 4 (August 1996): 547–54. http://dx.doi.org/10.1016/s1359-0286(96)80070-2.

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13

Gaspar, A. B., M. Seredyuk, and P. Gütlich. "Spin crossover in metallomesogens." Coordination Chemistry Reviews 253, no. 19-20 (October 2009): 2399–413. http://dx.doi.org/10.1016/j.ccr.2008.11.016.

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14

Kulikov, A. V., A. S. Komissarova, A. F. Shestakov, and L. S. Fokeeva. "Spin crossover in polyaniline." Russian Chemical Bulletin 56, no. 10 (October 2007): 2026–33. http://dx.doi.org/10.1007/s11172-007-0316-5.

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15

Ono, Kosuke, Michito Yoshizawa, Munetaka Akita, Tatsuhisa Kato, Yoshihide Tsunobuchi, Shin-ichi Ohkoshi, and Makoto Fujita. "Spin Crossover by Encapsulation." Journal of the American Chemical Society 131, no. 8 (March 4, 2009): 2782–83. http://dx.doi.org/10.1021/ja8089894.

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16

Tokarev, Alexey, Jérôme Long, Yannick Guari, Joulia Larionova, Françoise Quignard, Pierre Agulhon, Mike Robitzer, Gábor Molnár, Lionel Salmon, and Azzedine Bousseksou. "Spin crossover polysaccharide nanocomposites." New Journal of Chemistry 37, no. 11 (2013): 3420. http://dx.doi.org/10.1039/c3nj00534h.

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17

Tissot, Antoine. "Photoswitchable spin crossover nanoparticles." New Journal of Chemistry 38, no. 5 (2014): 1840. http://dx.doi.org/10.1039/c3nj01255g.

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18

Gütlich, Philipp. "Spin Crossover - Quo Vadis?" European Journal of Inorganic Chemistry 2013, no. 5-6 (February 18, 2013): 581–91. http://dx.doi.org/10.1002/ejic.201300092.

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19

Dankhoff, Katja, and Birgit Weber. "Isostructural iron(iii) spin crossover complexes with a tridentate Schiff base-like ligand: X-ray structures and magnetic properties." Dalton Transactions 48, no. 41 (2019): 15376–80. http://dx.doi.org/10.1039/c9dt00846b.

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20

Phonsri, Wasinee, Barnaby A. I. Lewis, Guy N. L. Jameson, and Keith S. Murray. "Double spin crossovers: a new double salt strategy to improve magnetic and memory properties." Chemical Communications 55, no. 93 (2019): 14031–34. http://dx.doi.org/10.1039/c9cc07416c.

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The first example of a “double spin crossover” material, [FeII(3,5-Me2 tris(pyrazolyl)methane)(tris(pyrazolyl)methane)][FeIII azodiphenolate]ClO4·2MeCN was synthesised by reacting a spin crossover FeII complex cation with a spin crossover FeIII complex anion.
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21

Cruddas, J., G. Ruzzi, and B. J. Powell. "Spin-state smectics in spin crossover materials." Journal of Applied Physics 129, no. 18 (May 14, 2021): 185102. http://dx.doi.org/10.1063/5.0045763.

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22

Lakhloufi, Sabine, Elodie Tailleur, Wenbin Guo, Frédéric Le Gac, Mathieu Marchivie, Marie-Hélène Lemée-Cailleau, Guillaume Chastanet, and Philippe Guionneau. "Mosaicity of Spin-Crossover Crystals." Crystals 8, no. 9 (September 13, 2018): 363. http://dx.doi.org/10.3390/cryst8090363.

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Real crystals are composed of a mosaic of domains whose misalignment is evaluated by their level of “mosaicity” using X-ray diffraction. In thermo-induced spin-crossover compounds, the crystal may be seen as a mixture of metal centres, some being in the high-spin (HS) state and others in the low spin (LS) state. Since the volume of HS and LS crystal packings are known to be very different, the assembly of domains within the crystal, i.e., its mosaicity, may be modified at the spin crossover. With little data available in the literature we propose an investigation into the temperature dependence of mosaicity in certain spin-crossover crystals. The study was preceded by the examination of instrumental factors, in order to establish a protocol for the measurement of mosaicity. The results show that crystal mosaicity appears to be strongly modified by thermal spin-crossover; however, the nature of the changes are probably sample dependent and driven, or masked, in most cases by the characteristics of the crystal (disorder, morphology …). No general relationship could be established between mosaicity and crystal properties. If, however, mosaicity studies in spin-crossover crystals are conducted and interpreted with great care, they could help to elucidate crucial crystal characteristics such as mechanical fatigability, and more generally to investigate systems where phase transition is associated with large volume changes.
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23

Orlov, Yu S., S. V. Nikolaev, and N. N. Paklin. "Photoinduced Nonlinear Dynamics of Strongly Correlated Systems with Spin Crossover: Autocatalytic Spin Transition." JETP Letters 119, no. 3 (February 2024): 227–32. http://dx.doi.org/10.1134/s0021364023603962.

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Nonlinear phenomena similar to the Belousov–Zhabotinsky reaction (autocatalytic oscillations of the population of high-spin and low-spin multielectron states of a transition metal ion) in open systems with spin crossover near bistability are considered. The conditions for possible experimental observation of autocatalytic oscillations of the magnetization in magnetically ordered systems with spin crossover are analyzed.
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24

Poungsripong, Peeranuch, Theerapoom Boonprab, Phimphaka Harding, Keith S. Murray, Wasinee Phonsri, Ningjin Zhang, Jonathan A. Kitchen, and David J. Harding. "Synthesis, mixed-spin-state structure and Langmuir–Blodgett deposition of amphiphilic Fe(iii) quinolylsalicylaldiminate complexes." RSC Advances 14, no. 39 (2024): 28716–23. http://dx.doi.org/10.1039/d4ra06111j.

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25

Shen, Fu-Xing, Wei Huang, Takashi Yamamoto, Yasuaki Einaga, and Dayu Wu. "Preparation of dihydroquinazoline carbohydrazone Fe(ii) complexes for spin crossover." New Journal of Chemistry 40, no. 5 (2016): 4534–42. http://dx.doi.org/10.1039/c5nj03095a.

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26

Bushuev, Mark B., Denis P. Pishchur, Elena B. Nikolaenkova, and Viktor P. Krivopalov. "Compensation effects and relation between the activation energy of spin transition and the hysteresis loop width for an iron(ii) complex." Physical Chemistry Chemical Physics 18, no. 25 (2016): 16690–99. http://dx.doi.org/10.1039/c6cp01892k.

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Wide thermal hysteresis loops for iron(ii) spin crossover complexes are associated with high activation barriers: the higher the activation barrier, the wider the hysteresis loop for a series of related spin crossover systems.
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27

Pavlik, Ján, and Jorge Linares. "Microscopic models of spin crossover." Comptes Rendus Chimie 21, no. 12 (December 2018): 1170–78. http://dx.doi.org/10.1016/j.crci.2018.05.001.

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28

Tao, Jun, Rong-Jia Wei, Rong-Bin Huang, and Lan-Sun Zheng. "Polymorphism in spin-crossover systems." Chem. Soc. Rev. 41, no. 2 (2012): 703–37. http://dx.doi.org/10.1039/c1cs15136c.

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29

El Hajj, Fatima, Ghania Sebki, Véronique Patinec, Mathieu Marchivie, Smail Triki, Henri Handel, Said Yefsah, Raphaël Tripier, Carlos J. Gómez-García, and Eugenio Coronado. "Macrocycle-Based Spin-Crossover Materials." Inorganic Chemistry 48, no. 21 (November 2, 2009): 10416–23. http://dx.doi.org/10.1021/ic9012476.

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30

Gaspar, Ana B., and Maksym Seredyuk. "Spin crossover in soft matter." Coordination Chemistry Reviews 268 (June 2014): 41–58. http://dx.doi.org/10.1016/j.ccr.2014.01.018.

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31

Ohkoshi, Shin-ichi, Kenta Imoto, Yoshihide Tsunobuchi, Shinjiro Takano, and Hiroko Tokoro. "Light-induced spin-crossover magnet." Nature Chemistry 3, no. 7 (June 5, 2011): 564–69. http://dx.doi.org/10.1038/nchem.1067.

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32

Gaspar, Ana B., Vadim Ksenofontov, Maksym Seredyuk, and Philipp Gütlich. "Multifunctionality in spin crossover materials." Coordination Chemistry Reviews 249, no. 23 (December 2005): 2661–76. http://dx.doi.org/10.1016/j.ccr.2005.04.028.

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33

NIHEI, M., T. SHIGA, Y. MAEDA, and H. OSHIO. "Spin crossover iron(III) complexes." Coordination Chemistry Reviews 251, no. 21-24 (November 2007): 2606–21. http://dx.doi.org/10.1016/j.ccr.2007.08.007.

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34

Sirirak, Jitnapa, David J. Harding, Phimphaka Harding, Keith S. Murray, Boujemaa Moubaraki, Lujia Liu, and Shane G. Telfer. "Spin Crossover incisManganese(III) Quinolylsalicylaldiminates." European Journal of Inorganic Chemistry 2015, no. 15 (April 27, 2015): 2534–42. http://dx.doi.org/10.1002/ejic.201500196.

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35

Schulte, Kelsey A., Stephanie R. Fiedler, and Matthew P. Shores. "Solvent Dependent Spin-State Behaviour via Hydrogen Bonding in Neutral FeII Diimine Complexes." Australian Journal of Chemistry 67, no. 11 (2014): 1595. http://dx.doi.org/10.1071/ch14145.

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We report the syntheses, structures, and magnetic properties of cis-[Fe(pizR)2(NCS)2] complexes based on the pyridyl imidazoline ligands 2-(2′-pyridinyl)-4,5-dihydroimidazole (pizH, 1) and 2-(2′-pyridinyl)-4,5-dihydro-1-methylimidazole (pizMe, 2). The ligands, complexes, and magnetic measurements are chosen to separate hydrogen-bonding and intrinsic ligand field properties, so as to improve our understanding of the effect of hydrogen-bonding interactions on spin-state switching. In the solid state, both complexes are high spin between 5 and 300 K. In deuterated methanol and acetonitrile solutions, both complexes show gradual thermal spin crossover. Complex 1, capable of hydrogen bonding, shows solvent-sensitive spin crossover, whereas spin crossover in the methylated analogue 2 is insensitive to solvent identity.
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36

Field, Ryan L., Lai Chung Liu, Yifeng Jiang, Wojciech Gawelda, Cheng Lu, and R. J. Dwayne Miller. "Ultrafast spin crossover in a single crystal." EPJ Web of Conferences 205 (2019): 07009. http://dx.doi.org/10.1051/epjconf/201920507009.

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Femtosecond spectroscopy and electron diffraction are used to characterize spin crossover in single crystal iron(II)-tris(bipyridine)-bis(hexafluorophosphate). The high-spin lifetime is reduced compared to in solution. Preliminary electron diffraction experiments show evidence of ultrafast Fe-N bond elongation associated with spin crossover and the subsequent molecular reorganization resulting from vibrational cooling.
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37

Wilson, Benjamin, Hayley Scott, Rosanna Archer, Corine Mathonière, Rodolphe Clérac, and Paul Kruger. "Solution-State Spin Crossover in a Family of [Fe(L)2(CH3CN)2](BF4)2 Complexes." Magnetochemistry 5, no. 2 (April 1, 2019): 22. http://dx.doi.org/10.3390/magnetochemistry5020022.

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We report herein on five new Fe(II) complexes of general formula [Fe(L)2(NCCH3)2](BF4)2•xCH3CN (L = substituted 2-pyridylimine-based ligands). The influence of proximally located electron withdrawing groups (e.g., NO2, CN, CF3, Cl, Br) bound to coordinated pyridylimine ligands has been studied for the effect on spin crossover in their Fe(II) complexes. Variable-temperature UV-visible spectroscopic studies performed on complexes with more strongly electronegative ligand substituents revealed spin crossover (SCO) in the solution, and thermodynamic parameters associated with the spin crossover were estimated.
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38

Peng, Yuan-Yuan, Si-Guo Wu, Yan-Cong Chen, Wei Liu, Guo-Zhang Huang, Zhao-Ping Ni, and Ming-Liang Tong. "Asymmetric seven-/eight-step spin-crossover in a three-dimensional Hofmann-type metal–organic framework." Inorganic Chemistry Frontiers 7, no. 8 (2020): 1685–90. http://dx.doi.org/10.1039/d0qi00245c.

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An unprecedented hysteretic seven-/eight-step spin-crossover behavior is revealed. Most importantly, a molecular alloy based on a Hofmann-type framework is used as a strategy to explore multi-step spin-crossover materials for the first time.
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39

Wang, Jun-Li, Qiang Liu, Xiao-Jin Lv, Rui-Lin Wang, Chun-Ying Duan, and Tao Liu. "Magnetic fluorescent bifunctional spin-crossover complexes." Dalton Transactions 45, no. 46 (2016): 18552–58. http://dx.doi.org/10.1039/c6dt03714c.

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40

Phonsri, Wasinee, David J. Harding, Phimphaka Harding, Keith S. Murray, Boujemaa Moubaraki, Ian A. Gass, John D. Cashion, Guy N. L. Jameson, and Harry Adams. "Stepped spin crossover in Fe(iii) halogen substituted quinolylsalicylaldimine complexes." Dalton Trans. 43, no. 46 (2014): 17509–18. http://dx.doi.org/10.1039/c4dt01701c.

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Four iron(iii) spin crossover complexes with halogen substituted ligands are reported. The halogen is correlated with T1/2 and controls the degree of spin crossover while extensive C–H⋯X and X⋯π interactions increase cooperativity.
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41

Li, Li, Alexander R. Craze, Outi Mustonen, Hikaru Zenno, Jacob J. Whittaker, Shinya Hayami, Leonard F. Lindoy, et al. "A mixed-spin spin-crossover thiozolylimine [Fe4L6]8+ cage." Dalton Transactions 48, no. 27 (2019): 9935–38. http://dx.doi.org/10.1039/c9dt01947b.

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42

Gheorghe, Andrei-Cristian, Yurii S. Bibik, Olesia I. Kucheriv, Diana D. Barakhtii, Marin-Vlad Boicu, Ionela Rusu, Andrei Diaconu, Il’ya A. Gural’skiy, Gábor Molnár, and Aurelian Rotaru. "Anomalous Pressure Effects on the Electrical Conductivity of the Spin Crossover Complex [Fe(pyrazine){Au(CN)2}2]." Magnetochemistry 6, no. 3 (July 31, 2020): 31. http://dx.doi.org/10.3390/magnetochemistry6030031.

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We studied the spin-state dependence of the electrical conductivity of two nanocrystalline powder samples of the spin crossover complex [Fe(pyrazine){Au(CN)2}2]. By applying an external pressure (up to 3 kbar), we were able to tune the charge transport properties of the material from a more conductive low spin state to a crossover point toward a more conductive high spin state. We rationalize these results by taking into account the spin-state dependence of the activation parameters of the conductivity.
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43

Phonsri, Wasinee, David S. Macedo, Barnaby A. I. Lewis, Declan F. Wain, and Keith S. Murray. "Iron(III) Azadiphenolate Compounds in a New Family of Spin Crossover Iron(II)–Iron(III) Mixed-Valent Complexes." Magnetochemistry 5, no. 2 (June 12, 2019): 37. http://dx.doi.org/10.3390/magnetochemistry5020037.

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A new family of mixed valent, double salt spin crossover compounds containing anionic FeIII and cationic FeII compounds i.e., [FeII{(pz)3CH}2][FeIII(azp)2]2·2H2O (4), [FeII(TPPZ)2][FeIII(azp)2]2]·H2O (5) and [FeII(TPPZ)2][FeIII(azp)2]2]·H2O·3MeCN (6) (where (pz)3CH = tris-pyrazolylmethane, TPPZ = 2,3,5,6, tetrapyridylpyrazine and azp2− = azadiphenolato) has been synthesized and characterised. This is the first time that the rare anionic spin crossover species, [FeIII(azp)2]−, has been used as an anionic component in double salts complexes. Single crystal structures and magnetic studies showed that compound 6 exhibits a spin transition relating to one of the FeIII centres of the constituent FeII and FeIII sites. Crystal structures of the anionic and cationic precursor complexes were also analysed and compared to the double salt products thus providing a clearer picture for future crystal design in double spin crossover materials. We discuss the effects that the solvent and counterion had on the crystal packing and spin crossover properties.
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44

Dakua, Kishan Kumar, Karunamoy Rajak, and Sabyashachi Mishra. "Spin–vibronic coupling in the quantum dynamics of a Fe(III) trigonal-bipyramidal complex." Journal of Chemical Physics 156, no. 13 (April 7, 2022): 134103. http://dx.doi.org/10.1063/5.0080611.

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The presence of a high density of excited electronic states in the immediate vicinity of the optically bright state of a molecule paves the way for numerous photo-relaxation channels. In transition-metal complexes, the presence of heavy atoms results in a stronger spin–orbit coupling, which enables spin forbidden spin-crossover processes to compete with the spin-allowed internal conversion processes. However, no matter how effectively the states cross around the Franck–Condon region, the degree of vibronic coupling, of both relativistic and non-relativistic nature, drives the population distribution among these states. One such case is demonstrated in this work for the intermediate-spin Fe(III) trigonal-bipyramidal complex. A quantum dynamical investigation of the photo-deactivation mechanism in the Fe(III) system is presented using the multi-configurational time-dependent Hartree approach based on the vibronic Hamiltonian whose coupling terms are derived from the state-averaged complete active space self-consistent field/complete active space with second-order perturbation theory (CASPT2) calculations and spin–orbit coupling of the scalar-relativistic CASPT2 states. The results of this study show that the presence of a strong (non-relativistic) vibronic coupling between the optically bright intermediate-spin state and other low-lying states of the same spin-multiplicity overpowers the spin–orbit coupling between the intermediate-spin and high-spin states, thereby lowering the chances of spin-crossover while exhibiting ultrafast relaxation among the intermediate-spin states. In a special case, where the population transfer pathway via the non-relativistic vibronic coupling is blocked, the probability of the spin-crossover is found to increase. This suggests that a careful modification of the complex by incorporation of heavier atoms with stronger relativistic effects can enhance the spin-crossover potential of Fe(III) intermediate-spin complexes.
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45

Chakraborty, Pradip, Mouhamadou Sy, Houcem Fourati, Teresa Delgado, Mousumi Dutta, Chinmoy Das, Céline Besnard, Andreas Hauser, Cristian Enachescu, and Kamel Boukheddaden. "Optical microscopy imaging of the thermally-induced spin transition and isothermal multi-stepped relaxation in a low-spin stabilized spin-crossover material." Physical Chemistry Chemical Physics 24, no. 2 (2022): 982–94. http://dx.doi.org/10.1039/d1cp04321h.

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46

Laisney, J., A. Tissot, G. Molnár, L. Rechignat, E. Rivière, F. Brisset, A. Bousseksou, and M. L. Boillot. "Nanocrystals of Fe(phen)2(NCS)2 and the size-dependent spin-crossover characteristics." Dalton Transactions 44, no. 39 (2015): 17302–11. http://dx.doi.org/10.1039/c5dt02840j.

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We describe the preparation of nano- and microcrystals of the Fe(phen)2(NCS)2 spin-crossover prototypical compound based on the solvent-assisted technique applied to an ionic and soluble precursor and analyze the size-dependent characteristics of the thermal spin-crossover.
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47

Pandurangan, Komala, Anthony B. Carter, Paulo N. Martinho, Brendan Gildea, Tibebe Lemma, Shang Shi, Aizuddin Sultan, Tia E. Keyes, Helge Müller-Bunz, and Grace G. Morgan. "Steric Quenching of Mn(III) Thermal Spin Crossover: Dilution of Spin Centers in Immobilized Solutions." Magnetochemistry 8, no. 1 (January 10, 2022): 8. http://dx.doi.org/10.3390/magnetochemistry8010008.

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Structural and magnetic properties of a new spin crossover complex [Mn(4,6-diOMe-sal2323)]+ in lattices with ClO4−, (1), NO3−, (2), BF4−, (3), CF3SO3−, (4), and Cl− (5) counterions are reported. Comparison with the magnetostructural properties of the C6, C12, C18 and C22 alkylated analogues of the ClO4− salt of [Mn(4,6-diOMe-sal2323)]+ demonstrates that alkylation effectively switches off the thermal spin crossover pathway and the amphiphilic complexes are all high spin. The spin crossover quenching in the amphiphiles is further probed by magnetic, structural and Raman spectroscopic studies of the PF6− salts of the C6, C12 and C18 complexes of a related complex [Mn(3-OMe-sal2323)]+ which confirm a preference for the high spin state in all cases. Structural analysis is used to rationalize the choice of the spin quintet form in the seven amphiphilic complexes and to highlight the non-accessibility of the smaller spin triplet form of the ion more generally in dilute environments. We suggest that lattice pressure is a requirement to stabilize the spin triplet form of Mn3+ as the low spin form is not known to exist in solution.
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48

Dankhoff, Katja, Charles Lochenie, and Birgit Weber. "Iron(II) Spin Crossover Complexes with 4,4′-Dipyridylethyne—Crystal Structures and Spin Crossover with Hysteresis." Molecules 25, no. 3 (January 29, 2020): 581. http://dx.doi.org/10.3390/molecules25030581.

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Three new iron(II) 1D coordination polymers with cooperative spin crossover behavior showing thermal hysteresis loops were synthesized using N2O2 Schiff base-like equatorial ligands and 4,4′-dipyridylethyne as a bridging, rigid axial linker. One of those iron(II) 1D coordination polymers showed a 73 K wide hysteresis below room temperature, which, upon solvent loss, decreased to a still remarkable 30 K wide hysteresis. Single crystal X-ray structures of two iron(II) coordination polymers and T-dependent powder XRD patterns are discussed to obtain insight into the structure property relationship of those materials.
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49

Shakirova, Olga G., and Ludmila G. Lavrenova. "Spin Crossover in New Iron(II) Coordination Compounds with Tris(pyrazol-1-yl)Methane." Crystals 10, no. 9 (September 22, 2020): 843. http://dx.doi.org/10.3390/cryst10090843.

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We review here new advances in the synthesis and investigation of iron(II) coordination compounds with tris(pyrazol-1-yl)methane and its derivatives as ligands. The complexes demonstrate thermally induced spin crossover accompanied by thermochromism. Factors that influence the nature and temperature of the spin crossover are discussed.
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50

Wang, Jun-Li, Qiang Liu, Yin-Shan Meng, Xin Liu, Hui Zheng, Quan Shi, Chun-Ying Duan, and Tao Liu. "Fluorescence modulation via photoinduced spin crossover switched energy transfer from fluorophores to FeII ions." Chemical Science 9, no. 11 (2018): 2892–97. http://dx.doi.org/10.1039/c7sc05221a.

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