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Książek M, Weselski M, Kusz J, Bronisz R. Single crystal-to-single crystal transformation - from two distinct to three distinct spin crossover centers in 2D coordination polymer [Fe(bbtr) 3](CF 3SO 3) 2. Dalton Trans 2021; 51:958-968. [PMID: 34931210 DOI: 10.1039/d1dt03578a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
1,4-Di(1,2,3-triazol-1-yl)butane (bbtr) forms a two-dimensional (2D) coordination polymer (1) in a reaction with iron(II) triflate. In the crystal lattice there are two crystallographically unique iron(II) ions surrounded octahedrally by a 1,2,3-triazole ring coordinated through nitrogen atoms N3. Single crystal X-ray diffraction studies revealed that spin crossover for each crystallographically independent iron(II) ion proceeds at a different temperature (T1/2(Fe1) = 201 K; T1/2(Fe2) = 216 K), while the magnetic measurements showed that there is one step, complete thermally induced spin crossover (T1/2 = 205 K). Complex 1 undergoes, with time, single crystal-to-single crystal transformation (SCSC) to the converted system (1c) from the R3̄ to the P63 space group, accompanied by significant changes in the lattice parameter c (a shortening of approximately one-third) and consequently unit cell volume. Structural transformation is associated with rebuilding of the polymeric layer as well as the anion network, which is reflected in the results of Mössbauer studies. In the polymorphic system (1c) there are three crystallographically independent iron(II) ions. The temperature dependence results for magnetic susceptibility indicated complete, one-step spin crossover very similar to that of 1; however, single-crystal X-ray diffraction studies of 1c revealed that spin crossover for each crystallographically independent iron(II) ion occurs in a different manner, revealing three elementary stages (T1/2(Fe1) = 200 K; T1/2(Fe2) = 212 K, T1/2(Fe3) = 214 K).
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Affiliation(s)
- Maria Książek
- Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
| | - Marek Weselski
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Joachim Kusz
- Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
| | - Robert Bronisz
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
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Hochdörffer T, Chumakov AI, Wille HC, Schünemann V, Wolny JA. Vibrational properties and cooperativity of the 3D spin crossover network [Fe(pyrazine)][Pt(CN) 4]. Dalton Trans 2019; 48:15625-15634. [PMID: 31418431 DOI: 10.1039/c9dt02139f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Nuclear inelastic scattering of synchrotron radiation has been used to determine the phonon density of vibrational states (pDOS) for the high-spin and low-spin phases of the hydrated and dehydrated isomer of the spin crossover polymer [Fe(pyrazine)][Pt(CN)4]. Density functional theory calculations have been performed for molecular models of the 3D polymeric system. The models contain 15 Fe(ii)/Zn(ii) centres and allowed the assignment of the observed bands to the corresponding vibrational modes. Thermodynamic parameters like the mean force constant and the vibrational entropy but also sound velocities of the molecular lattices in both spin states have been derived from the pDOS. Modelling of the low-spin and high-spin centres in the environment or matrix of different spins has revealed the enthalpic and entropic components of the intramolecular cooperativity. In contrast to the 1D spin crossover systems (Rackwitz, et al., Phys. Chem. Chem. Phys., 2013, 15, 15450) based on the rigid 1,2,4-triazole derivatives the distortion of the low-spin iron Fe(ii) centre by the matrix of high-spin Fe(ii) (modelled as Zn(ii)) occurs only in two dimensions, defined by the [M(CN)4]2- sheets, rather than concerning all six Fe-N bonds, as in 1D systems. The enthalpic intramolecular cooperativity has been determined to be 15 kJ mol-1 which is lower than that in 1D systems (20-30 kJ mol-1). Yet, the entropic contribution stabilizes the low-spin state in a low-spin matrix, a behaviour which is opposite to what was found for the 1D systems.
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Affiliation(s)
- Tim Hochdörffer
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
| | | | | | - Volker Schünemann
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
| | - Juliusz A Wolny
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
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Meyer R, Mücksch C, Wolny JA, Schünemann V, Urbassek HM. Atomistic simulations of spin-switch dynamics in multinuclear chain-like triazole spin-crossover molecules. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Jenni K, Scherthan L, Faus I, Marx J, Strohm C, Herlitschke M, Wille HC, Würtz P, Schünemann V, Wolny JA. Nuclear inelastic scattering and density functional theory studies of a one-dimensional spin crossover [Fe(1,2,4-triazole) 2(1,2,4-triazolato)](BF 4) molecular chain. Phys Chem Chem Phys 2017; 19:18880-18889. [PMID: 28702576 DOI: 10.1039/c7cp03690f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Nuclear inelastic scattering (NIS) experiments have been performed in order to study the vibrational dynamics of the low- and high-spin states of the polynuclear 1D spin crossover compound [Fe(1,2,4-triazole)2(1,2,4-triazolato)](BF4) (1). Density functional theory (DFT) calculations using the functional B3LYP* and the basis set CEP-31G for heptameric and nonameric models of the compound yielded the normal vibrations and electronic energies for high-spin and low-spin isomers of three models differing in the distribution of anionic trz- ligands and BF4- anions. On the basis of the obtained energies a structural model with a centrosymmetric Fe(trzH)4(trz-)2 coordination core of the mononuclear unit of the chain is proposed. The obtained distribution of the BF4- counteranions in the proposed structure is similar to that obtained on the basis of X-ray powder diffraction studies by Grossjean et al. (Eur. J. Inorg. Chem., 2013, 796). The NIS data of the system diluted to 10% Fe(ii) content in a 90% Zn(ii) matrix (compound (2)) show a characteristic change of the spectral pattern of the low-spin centres, compared to the low-spin phase of the parent Fe(ii) complex (1). DFT calculations reveal that this is caused by a change of the structure of the neighbours of the low-spin centres. The spectral pattern of the high-spin centres in (2) is within a good approximation identical to that of the high-spin Fe(ii) isomer of (1). The inspection of the molecular orbitals of the monomeric model systems of [Fe(trzH)4(trz-)2] and [Fe(trzH)6], together with calculations of spin transition energies, point towards the importance of an electrostatic effect caused by the negatively charged ligands. This results in the stabilisation of the low-spin state of the complex containing the anionic ligand and shortening of the Fe-N(trz-) compared to the Fe-N(trzH) bond in high-spin, but not in low-spin [Fe(trzH)4(trz-)2].
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Affiliation(s)
- Kevin Jenni
- Department of Physics, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany.
| | - Lena Scherthan
- Department of Physics, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany.
| | - Isabelle Faus
- Department of Physics, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany.
| | - Jennifer Marx
- Department of Physics, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany.
| | - Cornelius Strohm
- Deutsches Elektronen Synchrotron (DESY), Notkestr. 85, Hamburg, Germany
| | | | | | - Peter Würtz
- Department of Physics, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany.
| | - Volker Schünemann
- Department of Physics, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany.
| | - Juliusz A Wolny
- Department of Physics, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany.
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Bräunlich I, Mair C, Bauer M, Caseri W. Structural Transitions and Thermochromism of Linear Polynuclear Cobalt(II)-4-Octadecyl-1,2,4-triazole Complexes. J Inorg Organomet Polym Mater 2017. [DOI: 10.1007/s10904-016-0486-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bushuev MB, Pishchur DP, Korolkov IV, Vinogradova KA. Prototypical iron(ii) complex with 4-amino-1,2,4-triazole reinvestigated: an unexpected impact of water on spin transition. Phys Chem Chem Phys 2017; 19:4056-4068. [DOI: 10.1039/c6cp06854e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Variations in the outerspheric water molecule content induce drastic and unpredictable changes in the spin crossover regimes.
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Affiliation(s)
- Mark B. Bushuev
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch of Russian Academy of Sciences
- 3
- Acad. Lavrentiev Ave
- Novosibirsk
| | - Denis P. Pishchur
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch of Russian Academy of Sciences
- 3
- Acad. Lavrentiev Ave
- Novosibirsk
| | - Ilya V. Korolkov
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch of Russian Academy of Sciences
- 3
- Acad. Lavrentiev Ave
- Novosibirsk
| | - Katerina A. Vinogradova
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch of Russian Academy of Sciences
- 3
- Acad. Lavrentiev Ave
- Novosibirsk
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Raman and nuclear inelastic scattering study of the lattice dynamics of the [Fe(H 2 B(pz) 2 ) 2 (phen)] spin crossover complex. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.04.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Vibrational Coupling of Nearest Neighbors in 1-D Spin Crossover Polymers of Rigid Bridging Ligands. A Nuclear Inelastic Scattering and DFT Study. MAGNETOCHEMISTRY 2016. [DOI: 10.3390/magnetochemistry2020019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Dîrtu MM, Schmit F, Naik AD, Rusu I, Rotaru A, Rackwitz S, Wolny JA, Schünemann V, Spinu L, Garcia Y. Two-Step Spin Transition in a 1D FeII1,2,4-Triazole Chain Compound. Chemistry 2015; 21:5843-55. [DOI: 10.1002/chem.201406231] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 01/18/2015] [Indexed: 11/10/2022]
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Guillaume F, Tobon YA, Bonhommeau S, Létard JF, Moulet L, Freysz E. Photoswitching of the spin crossover polymeric material [Fe(Htrz)2(trz)](BF4) under continuous laser irradiation in a Raman scattering experiment. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.04.024] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chen MY, Chen XR, Ning WH, Ren XM. A facile route for preparation of monodisperse nanoparticles of one-dimensional Fe(ii)-4-amino-1,2,4-triazole coordination polymers with hysteretic spin-crossover near room temperature. RSC Adv 2014. [DOI: 10.1039/c4ra07565j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Monodisperse nanoparticles of one-dimensional Fe(II)-4-amino-1,2,4-triazole coordination polymers show hysteretic spin-crossover near room temperature.
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Affiliation(s)
- Meng-Ya Chen
- State Key Laboratory of Material-Oriented Chemical Engineering and College of Science
- Nanjing Tech University
- Nanjing 210009, P.R. China
| | - Xuan-Rong Chen
- State Key Laboratory of Material-Oriented Chemical Engineering and College of Science
- Nanjing Tech University
- Nanjing 210009, P.R. China
| | - Wei-Hua Ning
- State Key Laboratory of Material-Oriented Chemical Engineering and College of Science
- Nanjing Tech University
- Nanjing 210009, P.R. China
| | - Xiao-Ming Ren
- State Key Laboratory of Material-Oriented Chemical Engineering and College of Science
- Nanjing Tech University
- Nanjing 210009, P.R. China
- College of Materials Science and Engineering
- Nanjing Tech University
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Morozov VA. Cooperative spin-crossover-like transitions in the inhomogeneous chain of exchange clusters. Phys Chem Chem Phys 2013; 15:9931-9. [PMID: 23677133 DOI: 10.1039/c3cp50689d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A statistical theory of temperature-induced spin-crossover-like transitions has been developed for spin chains with a few exchange clusters in a unit cell. Using static magnetic susceptibility measurements, a general expression for the effective magnetic moment μ(eff) of exchange clusters is obtained for an arbitrary structure of cluster terms. For heterospin Cu(hfac)2L(R) complexes ("breathing crystals") with a "head-to-head" chain motif, a two-point approximation for a partition function of the Jahn-Teller Cu(+2) paramagnetic center (spin 1/2) is suggested. Theoretical results are compared with available experimental data on thermal spin-crossover-like transitions in the "breathing crystal" compounds. It is shown that the model developed is able to successfully describe both of the cases of smooth and abrupt (cooperative) spin transitions for chains of three-spin exchange clusters. Spin-crossover-like transitions of a new type with step-wise changes in a positive exchange integral are predicted.
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Affiliation(s)
- Vitaliy A Morozov
- International Tomography Centre of Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation.
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13
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Paulsen H, Schünemann V, Wolny JA. Progress in Electronic Structure Calculations on Spin-Crossover Complexes. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201289] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Rackwitz S, Klopper W, Schünemann V, Wolny JA. Quantification of intramolecular cooperativity in polynuclear spin crossover Fe(ii) complexes by density functional theory calculations. Phys Chem Chem Phys 2013; 15:15450-8. [PMID: 23939140 DOI: 10.1039/c3cp52240g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Sergej Rackwitz
- University of Kaiserslautern, Department of Physics, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
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Tobon YA, Kabalan L, Bonhommeau S, Daro N, Grosjean A, Guionneau P, Matar S, Létard JF, Guillaume F. Spin crossover complexes [Fe(NH2trz)3](X)2·nH2O investigated by means of polarized Raman scattering and DFT calculations. Phys Chem Chem Phys 2013; 15:18128-37. [DOI: 10.1039/c3cp52505h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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