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Kitase K, Akahoshi D, Kitazawa T. Soma-Iwamoto-type SCO complex Fe(quinazoline) 2[Au(CN) 2] 2 using the quinazoline-type ligand. Dalton Trans 2024; 53:9248-9251. [PMID: 38722157 DOI: 10.1039/d4dt00458b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
The Hofmann-type complex and Soma-Iwamoto-type complex are cyano-bridged coordination polymers and both have been widely researched. Now we have synthesized a novel Soma-Iwamoto-type complex, namely Fe(quinazoline)2[Au(CN)2]2. This complex shows the Soma-Iwamoto-type bilayer with Au-Au interactions and a SCO phenomenon with a gradual change of magnetic susceptibility. Fe(H2O)2(quinazoline)2[Au(CN)2]2 has also been synthesized and crystallized, and has been found to be a mononuclear complex with hydrogen-bonding network interactions.
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Affiliation(s)
- Kosuke Kitase
- Department of Chemistry, Toho University, Chiba 274-8510, Japan.
| | | | - Takafumi Kitazawa
- Department of Chemistry, Toho University, Chiba 274-8510, Japan.
- Research Centre for Materials with Integrated Properties, Toho University, Chiba 274-8510, Japan
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Visinescu D, Shylin SI, Shova S, Novitchi G, Popescu DL, Alexandru MG. New cyanido-bridged iron(II) spin crossover coordination polymers with an unusual ladder-like topology: an alternative to Hofmann clathrates. Dalton Trans 2024; 53:9062-9071. [PMID: 38738339 DOI: 10.1039/d4dt00870g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2024]
Abstract
Two new cyanido-bridged {FeIIMII} double chains were obtained by reacting cyanido anions [M(CN)4]2- with complex cations [FeII(tptz)]2+ (preformed in situ by mixing a hydrated tetrafluoroborate salt of iron(II) and a tptz ligand, tptz = 2,4,6-tri(2-pyridyl)-1,3,5-triazine) having the general formula [FeII(tptz)MII(CN)4]·2H2O·CH3CN, where M = Pd (1) or Pt (2). Additionally, two molecular complexes formulated as [FeII(tptz)2][MII(CN)4]·4.25H2O, where M = Pd (3) or Pt (4), were subsequently obtained from the same reaction, as secondary products. Single crystal X-ray analysis revealed that 1 and 2 are isostructural and crystallize in the P-1 triclinic space group. Their structure consists of a double-chain with a ladder-like topology, in which cyanido-based [M(CN)4]2- metalloligands coordinate, through three CN- ligands and three [FeII(tptz)]2+ complex cations. Compounds 3 and 4 are also isostructural and crystallize in the P1̄ triclinic space group, and the X-ray structural data show the formation of [FeII(tptz)2]2+ and [MII(CN)4]2- ionic units interconnected through H-bonds and π⋯π stacking supramolecular interactions. The static DC magnetic measurements recorded in the temperature range of 2-300 K showed that 1 and 2 exhibit incomplete spin transition on cooling, which is also confirmed by single crystal XRD analysis and Mössbauer spectroscopy. Compounds 3 and 4 are diamagnetic, most likely due to the encapsulation of Fe(II) in a tight pocket formed by two tptz ligands that preserve the low-spin state in the temperature range of 2-400 K.
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Affiliation(s)
- Diana Visinescu
- Coordination and Supramolecular Chemistry Laboratory, "Ilie Murgulescu" Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, Bucharest 060021, Romania
| | - Sergii I Shylin
- Department of Chemistry - Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden
| | - Sergiu Shova
- Petru Poni Institute of Macromolecular Chemistry, Romanian Academy, Aleea Grigore Ghica Vodă 41-A, RO-700487 Iasi, Romania
| | - Ghenadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses (LNCMI), Univ. Grenoble Alpes, EMFL, CNRS 38042 Grenoble, France.
| | - Delia-Laura Popescu
- Faculty of Chemistry, University of Bucharest, Regina Elisabeta Blvd 4-12, Bucharest 030018, Romania
| | - Maria-Gabriela Alexandru
- Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania.
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Kitase K, Akahoshi D, Kitazawa T. Guest-triggered "Soma-Iwamoto-type" penetration complex {Fe(4-methoxypyrimidine) 2[M(CN) 2] 2}·Guest (M = Ag, Au). Dalton Trans 2023; 52:2571-2579. [PMID: 36752163 DOI: 10.1039/d2dt03716e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Many laboratories have performed extensive studies on the spin-crossover (SCO) phenomenon. Herein, we synthesized novel "Soma-Iwamoto type" complexes containing a 4-methoxypyrimidine (4-MeOPmd) ligand, i.e., {Fe(4-MeOPmd)2[Ag(CN)2]2} (1Ag), {Fe(4-MeOPmd)2[Au(CN)2]2} (1Au), and {Fe(4-MeOPmd)2[Ag(CN)2]2·0.25(4-MeOPmd)} (1Ag·0.25G). Moreover, we synthesized a 4,6-dimethoxypyrimidine (4,6-diMeOPmd) clathrate complex, i.e., {Fe(4-MeOPmd)2[Ag(CN)2]2·0.25(4,6-diMeOPmd)} (2Ag·0.25G) and {Fe(4-MeOPmd)2[Au(CN)2]2·0.25(4,6-diMeOPmd)} (2Au·0.25G). Some of these complexes, i.e., 1Ag·0.25G, 2Ag·0.25G, and 2Au·0.25G, demonstrated penetrated structures, which are very interesting given that they have rarely been reported to date. 1Au and 1Ag did not show the SCO phenomenon, 1Ag·0.25G showed a gradual multi-step SCO phenomenon, and 2Au·0.25G and 2Ag·0.25G showed an abrupt half SCO phenomenon.
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Affiliation(s)
- Kosuke Kitase
- Department of Chemistry, Toho University, Chiba 274-8510, Japan.
| | | | - Takafumi Kitazawa
- Department of Chemistry, Toho University, Chiba 274-8510, Japan. .,Research Centre for Materials with Integrated Properties, Toho University, Chiba 274-8510, Japan
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Spin-crossover in [Fe(Quinazoline)2][Fe(CN)5NO]. Evidence of its framework flexibility. Inorganica Chim Acta 2023. [DOI: 10.1016/j.ica.2023.121402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Solovyev M, Kucheryavy P, Lockard JV. Local Coordination and Electronic Structure Ramifications of Guest-Dependent Spin Crossover in a Metal-Organic Framework: A Combined X-ray Absorption and Emission Spectroscopy Study. Inorg Chem 2022; 61:9213-9223. [PMID: 35678726 DOI: 10.1021/acs.inorgchem.2c00774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The porous Hoffman-type 3D lattice Fe(pz)[NiII(CN)4] exhibits thermally induced spin-crossover (SCO) behavior that is dependent on the solvent guest species occupying the pores. Here, in situ Fe K-edge X-ray absorption spectroscopy (XAS) and both non-resonant and resonant Kβ X-ray emission spectroscopy (XES) methods are used to probe this framework under two solvent environments that yield different extremes of spin crossover temperature: acetonitrile and toluene. While the acetonitrile pore environment engenders an SCO response around room temperature, toluene guests stabilize the high spin state and effectively suppress SCO behavior throughout the ambient temperature range. The multipronged X-ray spectroscopy approach simultaneously confirmed this spin crossover behavior and provided new local coordination and electronic structural insights of the framework under these two solvent environments. Extended X-ray absorption fine structure analysis revealed spin state and solvent guest-dependent differences in coordination bond lengths and structural disorder. Resonant XES measurements produced high-resolution XAS spectra with distinct pre-edge and edge features, whose assignment was established using both simple ligand field theory and time-dependent density-functional theory calculations and further supported by their observed resonance behavior in the 2D RXES plane. Edge feature variation with the Fe spin state was interpreted to reveal changes in specific metal-linker bond covalency.
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Affiliation(s)
- Mikhail Solovyev
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Pavel Kucheryavy
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Jenny V Lockard
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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Hiiuk VM, Shylin SI, Barakhtii DD, Korytko DM, Kotsyubynsky VO, Rotaru A, Shova S, Gural'skiy IA. Two-Step Spin Crossover in Hofmann-Type Coordination Polymers [Fe(2-phenylpyrazine) 2{M(CN) 2} 2] (M = Ag, Au). Inorg Chem 2022; 61:2093-2104. [PMID: 35029111 DOI: 10.1021/acs.inorgchem.1c03302] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Two 2D Hofmann-type complexes of the composition [Fe(Phpz)2{M(CN)2}2] (where Phpz = 2-phenylpyrazine; M = Ag, Au) have been synthesized, and their spin-crossover (SCO) behavior has been thoroughly characterized. Single-crystal X-ray analysis reveals that these complexes contain a crystallographically unique Fe(II) center surrounded by two axial Phpz ligands and four equatorial cyanide [M(CN)2]- bridges. It is shown that, using of a ligand with two aromatic rings, an advanced system of weak supramolecular interactions (metal-metal, C-H···M, and π···π stacking contacts) is realized. This ensures additional stabilization of the structures and the absence of solvent-accessible voids due to dense packing. Both complexes are characterized by a highly reproducible two-step SCO behavior, as revealed by different techniques (superconducting quantum interference device magnetometry, optical microscopy, etc.). Research shows the exceptional role of the presence of various supramolecular interactions in the structure and the influence of the bulky substituent in the ligand on SCO behavior. Moreover, the perspective of substituted pyrazines for the design of new switchable materials is supported by this work.
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Affiliation(s)
- Volodymyr M Hiiuk
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska Street, 01601 Kyiv, Ukraine.,Faculty of Natural Sciences, National University of Kyiv-Mohyla Academy, 2 Skovorody Street, 04070 Kyiv, Ukraine
| | - Sergii I Shylin
- Ångström Laboratory, Department of Chemistry, Uppsala University, 75120 Uppsala, Sweden
| | - Diana D Barakhtii
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska Street, 01601 Kyiv, Ukraine
| | - Dmytro M Korytko
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska Street, 01601 Kyiv, Ukraine
| | - Volodymyr O Kotsyubynsky
- Department of Material Science and New Technology, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Street, 76018 Ivano-Frankivsk, Ukraine
| | - Aurelian Rotaru
- Faculty of Electrical Engineering and Computer Science & Research Center MANSiD, Stefan cel Mare University, 13 Universitatii Street, 720229 Suceava, Romania
| | - Sergiu Shova
- Ningbo University of Technology, No. 201, Fenghua Road, Ningbo City, Zhejiang 315211, China.,"Petru Poni" Institute of Macromolecular Chemistry, 41A Aleea Gr. Ghica Voda, 700487 Iasi, Romania
| | - Il'ya A Gural'skiy
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska Street, 01601 Kyiv, Ukraine
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