1
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Robb MG, Chong SV, Brooker S. Iron(II) spin crossover complexes of tetradentate Schiff-bases: tuning T1/2 by choice of formyl-heterocycle component. Dalton Trans 2024; 53:10974-10981. [PMID: 38873979 DOI: 10.1039/d4dt00884g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
Four new tetradentate Schiff-base ligands were prepared in situ from the 1 : 2 condensation of 1,3-diaminopropane and either 2-thiazolecarboxaldehyde (L2thiazole), 4-thiazolecarboxaldehyde (L4thiazole), 4-oxazolecarboxaldehyde (L4oxazole), or 5-bromopyridine-2-aldehyde (L5Br-pyridine), and complexed with [Fe(NCS)2(pyridine)4] to give four monometallic FeII complexes, [Fe(Lheterocycle)(NCS)2]. Structural characterisation shows the expected octahedral FeII centres in all cases, with Lheterocycle occupying the equatorial plane and the two thiocyanate ligands trans to each other, resulting in an N6 coordination sphere. Solid state magnetic measurements showed that the two complexes with the thiazole-based ligands exhibit the beginning of a spin transition above 300 K, with T1/2 = 350 K for [Fe(L4thiazole)(NCS)2] and 400 K for [Fe(L2thiazole)(NCS)2], whereas the 4-oxazole-based ligand gives [Fe(L4oxazole)(NCS)2] which remains high spin at all measured temperatures (50-400 K). Interestingly, [Fe(L5Br-pyridine)(NCS)2] crystallised as two solvent-free polymorphs: magnetic measurements on samples with both polymorphs present showed a two step SCO with an abrupt transition at T1/2 = 245 K assigned to the transition in polymorph A (as this was also seen in a sample of pure polymorph A), and a gradual transition at T1/2 = 304 K assigned to polymorph B. These findings show that the order of increasing ligand field strength for these heterocycles is 4-oxazole ≪ 5Br-pyridine < 4-thiazole < 2-thiazole.
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Affiliation(s)
- Matthew G Robb
- Department of Chemistry and MacDiarmid Institute of Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand.
| | - Shen V Chong
- Robinson Research Institute, School of Engineering, Victoria University of Wellington, PO Box 33436, Lower Hutt 5046, New Zealand
| | - Sally Brooker
- Department of Chemistry and MacDiarmid Institute of Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand.
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2
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Hagiwara H, Sonoda K. Impact of flexible hexyl chain ordering in a mononuclear spin crossover iron(III) complex. Dalton Trans 2024; 53:5851-5860. [PMID: 38477362 DOI: 10.1039/d4dt00425f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
A novel FeIII complex [Fe(Hex-tnal)2]BPh4 (1) with a tridentate N2O ligand having an n-hexyl chain, Hex-Htnal (=1-((((1-hexyl-1H-1,2,3-triazol-4-yl)methyl)imino)methyl)naphthalen-2-ol), is reported. Temperature-dependent magnetic susceptibility measurements revealed that 1 exhibits a two-step spin crossover (SCO) transition in the 400-10 K temperature range, including an unusual gradual χMT change above RT (300-345 K) and a hysteretic χMT jump in a narrow temperature range of 345-357 K. These behaviors were also characterized by differential scanning calorimetry. Variable-temperature single-crystal X-ray diffraction studies revealed that the order-disorder transition and conformational change of the hexyl chains and the symmetry change associated with the re-entrant structural phase transition, namely triclinic P1̄ (100-275 K) ↔ monoclinic C2/c (296-340 K) ↔ triclinic P1̄ (360 K), are coupled to variations in intermolecular interactions and the N4O2 coordination environment, resulting in the occurrence of the unusual two-step SCO transition of 1. This study demonstrates that the flexible motion of alkyl substituents in the supramolecular lattice influences the occurrence of anomalous magnetic switching properties.
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Affiliation(s)
- Hiroaki Hagiwara
- Department of Chemistry, Faculty of Education, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan.
| | - Kento Sonoda
- Department of Chemistry, Faculty of Education, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan.
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3
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Seredyuk M, Znovjyak K, Valverde-Muñoz FJ, Muñoz MC, Fritsky IO, Amirkhanov VM, Real JA. Spin transition and symmetry-breaking in new mononuclear FeII tren-complexes with up to 38 K hysteresis around room temperature. Inorg Chem Front 2022. [DOI: 10.1039/d1qi00941a] [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
New FeII complexes based on the well-known tripodand ligand type undergo abrupt hysteretic spin transition due to the symmetry-breaking in the room temperature region.
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Affiliation(s)
- Maksym Seredyuk
- Departament de Quimica Inorgànica, Institut de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601, Kyiv, Ukraine
| | - Kateryna Znovjyak
- Departament de Quimica Inorgànica, Institut de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601, Kyiv, Ukraine
| | | | - M. Carmen Muñoz
- Departamento de Fisica Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - Igor O. Fritsky
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601, Kyiv, Ukraine
| | - Volodymyr M. Amirkhanov
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601, Kyiv, Ukraine
| | - Jose A. Real
- Departament de Quimica Inorgànica, Institut de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
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4
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Hagiwara H, Konomura S. Thermosalience coupled to abrupt spin crossover with dynamic ligand motion in an iron(II) molecular crystal. CrystEngComm 2022. [DOI: 10.1039/d2ce00501h] [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
Here we report an iron(II) molecular crystal that show thermosalient effect (crystal jumping) coupled to cooperative high-spin (HS) to low-spin (LS) spin crossover (SCO). The new iron(II) compound [Fe(LPh,Et)2(NCS)2] (LPh,Et...
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5
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You M, Nguyen GT, Shao D, Wang T, Chang X, Ungur L, Zhang YZ. Manipulating the spin crossover behaviour in a series of cyanide-bridged {FeIII2FeII2} molecular squares through NCE- co-ligands. Dalton Trans 2022; 51:5596-5602. [DOI: 10.1039/d2dt00058j] [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
Manipulating the transition temperature (T1/2) of spin-crossover (SCO) complexes capable of fulfilling practical criteria through different synthetic strategies is one of the main focuses in the field of molecular magnetism....
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6
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1-(4-Nitrophenyl)-1H-1,2,3-Triazole-4-carbaldehyde: Scalable Synthesis and Its Use in the Preparation of 1-Alkyl-4-Formyl-1,2,3-triazoles. ORGANICS 2021. [DOI: 10.3390/org2040024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
1,2,3-Triazole-4-carbaldehydes are useful synthetic intermediates which may play an important role in the discovery of novel applications of the 1,2,3-triazole moiety. In this work, a one-step multigram scale synthesis of 4-formyl-1-(4-nitrophenyl)-1H-1,2,3-triazole (FNPT) as a preferred reagent for the synthesis of 1-alkyl-4-formyltriazoles is described, making use of the commercially available 3-dimethylaminoacrolein and 4-nitrophenyl azide. Next, the earlier reported reaction of FNPT with alkylamines is further explored, and for hexylamine, the one-pot sequential cycloaddition and Cornforth rearrangement is demonstrated. In addition, a useful protocol for the in situ diazotization of 4-nitroaniline is provided. This facilitated the complete hydrolysis of rearranged 4-iminomethyl-1,2,3-triazoles and allowed for the recycling of 4-nitrophenyl azide.
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7
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Yang JH, Zhao YX, Xue JP, Yao ZS, Tao J. Reverse Hofmann-Type Spin-Crossover Compound Showing a Multichannel Controllable Color Change in an Ambient Environment. Inorg Chem 2021; 60:7337-7344. [PMID: 33945276 DOI: 10.1021/acs.inorgchem.1c00484] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Materials that demonstrate a multichannel controllable color change in response to external stimuli are fascinating for their potential applications in sensoring and displaying devices. Herein we report a FeII spin-crossover (SCO) compound that exhibits both solvatochromism and thermochromism under an ambient environment. This Hofmann-type compound possesses two different pores where the solvent guests can be removed in a two-step process. Because the loss of solvent guests modifies the spin state of magnetic centers, an unusual yellow-red-yellow two-step color change of crystals was detected. Moreover, because of the strong cooperativity of the spin centers, a dramatic red-to-yellow color change of crystals in response to a minute thermal perturbation around 303 K is triggered by an abrupt spin transition of the metal centers. The multichannel controllable dramatic color change demonstrated in the present compound highlights the sensoring and displaying roles of SCO materials.
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Affiliation(s)
- Jing-Hua Yang
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing 102488, People's Republic of China
| | - Yan-Xin Zhao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing 102488, People's Republic of China
| | - Jin-Peng Xue
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing 102488, People's Republic of China
| | - Zi-Shuo Yao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing 102488, People's Republic of China
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing 102488, People's Republic of China
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8
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Znovjyak K, Seredyuk M, Malinkin SO, Golenya IA, Sliva TY, Shova S, Mulloev NU. Crystal structure of ( N 1, N 3-bis-{[1-(4-meth-oxy-benz-yl)-1 H-1,2,3-triazol-4-yl]methyl-idene}-2,2-di-meth-yl-propane-1,3-di-amine)-bis-(thio-cyanato)-iron(II). Acta Crystallogr E Crystallogr Commun 2021; 77:495-499. [PMID: 34026252 PMCID: PMC8100278 DOI: 10.1107/s2056989021003662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 04/06/2021] [Indexed: 11/10/2022]
Abstract
The unit cell of the title compound, [FeII(NCS)2(C29H32N8O2)], consists of eight charge-neutral complex mol-ecules. In the complex mol-ecule, the tetra-dentate ligand N 1,N 3-bis-{[1-(4-meth-oxy-benz-yl)-1H-1,2,3-triazol-4-yl]methyl-ene}-2,2-di-methyl-propane-1,3-di-amine coordinates to the FeII ion through the N atoms of the 1,2,3-triazole and aldimine groups. Two thio-cyanate anions, coordinated through their N atoms, complete the coordination sphere of the central Fe ion. In the crystal, neighbouring mol-ecules are linked through weak C⋯C, C⋯N and C⋯S inter-actions into a one-dimensional chain running parallel to [010]. The inter-molecular contacts were qu-anti-fied using Hirshfeld surface analysis and two-dimensional fingerprint plots, revealing the relative contributions of the contacts to the crystal packing to be H⋯H (37.5%), H⋯C/C⋯H (24.7%), H⋯S/S⋯H (15.7%) and H⋯N/N⋯H (11.7%). The average Fe-N bond distance is 2.167 Å, indicating the high-spin state of the FeII ion, which does not change upon cooling, as demonstrated by low-temperature magnetic susceptibility measurements.
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Affiliation(s)
- Kateryna Znovjyak
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Maksym Seredyuk
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Sergey O. Malinkin
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Iryna A. Golenya
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Tatiana Y. Sliva
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Sergiu Shova
- Department of Inorganic Polymers, "Petru Poni" Institute of Macromolecular, Chemistry, Romanian Academy of Science, Aleea Grigore Ghica Voda 41-A, Iasi, 700487, Romania
| | - Nurullo U. Mulloev
- The Faculty of Physics, Tajik National University, Rudaki Avenue 17, Dushanbe, 734025, Tajikistan
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9
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Znovjyak K, Seredyuk M, Malinkin SO, Golenya IO, Amirkhanov VM, Shova S, Mulloev NU. Crystal structure of { N 1, N 3-bis-[(1- tert-butyl-1 H-1,2,3-triazol-4-yl)methyl-idene]-2,2-di-methyl-propane-1,3-di-amine}-bis-(thio-cyanato)-iron(II). Acta Crystallogr E Crystallogr Commun 2021; 77:573-578. [PMID: 34026268 PMCID: PMC8100266 DOI: 10.1107/s2056989021004412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 04/24/2021] [Indexed: 11/21/2022]
Abstract
The unit cell of the title compound, [FeII(NCS)2(C19H32N8)], consists of two charge-neutral complex mol-ecules. In the complex mol-ecule, the tetra-dentate ligand N 1 ,N 3-bis-[(1-tert-butyl-1H-1,2,3-triazol-4-yl)methyl-ene]-2,2-di-methyl-propane-1,3-di-amine coordinates to the FeII ion through the N atoms of the 1,2,3-triazole and aldimine groups. Two thio-cyanate anions, also coordinated through their N atoms, complete the coordination sphere of the central Fe ion. In the crystal, neighbouring mol-ecules are linked through weak C-H⋯C/S/N inter-actions into a three-dimensional network. The inter-mol-ecular contacts were qu-anti-fied using Hirshfeld surface analysis and two-dimensional fingerprint plots, revealing the relative contributions of the contacts to the crystal packing to be H⋯H 50.8%, H⋯C/C⋯H 14.3%, H⋯S/S⋯H 20.5% and H⋯N/N⋯H 12.1%. The average Fe-N bond distance is 2.170 Å, indicating the high-spin state of the FeII ion, which does not change upon cooling, as demonstrated by low-temperature magnetic susceptibility measurements. DFT calculations of energy frameworks at the B3LYP/6-31 G(d,p) theory level were performed to account for the inter-actions involved in the crystal structure.
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Affiliation(s)
- Kateryna Znovjyak
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Maksym Seredyuk
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Sergey O. Malinkin
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Iryna O. Golenya
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Vladimir M. Amirkhanov
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Sergiu Shova
- Department of Inorganic Polymers, "Petru Poni" Institute of Macromolecular, Chemistry, Romanian Academy of Science, Aleea Grigore Ghica Voda 41-A, Iasi, 700487, Romania
| | - Nurullo U. Mulloev
- The Faculty of Physics, Tajik National University, Rudaki Avenue 17, Dushanbe, 734025, Tajikistan
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10
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An X, Fang W, Wang Z, Liu K, Ding L, Peng J, Liu T, Peng H, Salmon L, Fang Y. Supramolecular gel strategy-based nanomaterials with room temperature spin transition. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.126016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Song H, Rogers NJ, Brabec V, Clarkson GJ, Coverdale JPC, Kostrhunova H, Phillips RM, Postings M, Shepherd SL, Scott P. Triazole-based, optically-pure metallosupramolecules; highly potent and selective anticancer compounds. Chem Commun (Camb) 2021; 56:6392-6395. [PMID: 32390012 DOI: 10.1039/d0cc02429e] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Functionalised triazole aldehydes are used in the highly selective self-assembly of water-compatible, optically pure, low symmetry Fe(ii)- and Zn(ii)-based metallohelices. Sub-micromolar antiproliferative activity is observed against various cancerous cell lines, accompanied by excellent selectivity versus non-cancerous cells and potential for synergistic combinatorial therapy with cisplatin.
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Affiliation(s)
- Hualong Song
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.
| | - Nicola J Rogers
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.
| | - Viktor Brabec
- The Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, CZ-61265 Brno, Czech Republic.
| | - Guy J Clarkson
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.
| | | | - Hana Kostrhunova
- The Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, CZ-61265 Brno, Czech Republic.
| | - Roger M Phillips
- School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - Miles Postings
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.
| | - Samantha L Shepherd
- School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - Peter Scott
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.
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12
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Milocco F, de Vries F, Bartels IMA, Havenith RWA, Cirera J, Demeshko S, Meyer F, Otten E. Electronic Control of Spin-Crossover Properties in Four-Coordinate Bis(formazanate) Iron(II) Complexes. J Am Chem Soc 2020; 142:20170-20181. [PMID: 33197175 PMCID: PMC7705964 DOI: 10.1021/jacs.0c10010] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
![]()
The
transition between spin states in d-block metal complexes has
important ramifications for their structure and reactivity, with applications
ranging from information storage materials to understanding catalytic
activity of metalloenzymes. Tuning the ligand field (ΔO) by steric and/or electronic effects has provided spin-crossover
compounds for several transition metals in the periodic table, but
this has mostly been limited to coordinatively saturated metal centers
in octahedral ligand environments. Spin-crossover complexes with low
coordination numbers are much rarer. Here we report a series of four-coordinate,
(pseudo)tetrahedral Fe(II) complexes with formazanate ligands and
demonstrate how electronic substituent effects can be used to modulate
the thermally induced transition between S = 0 and S = 2 spin states in solution. All six compounds undergo
spin-crossover in solution with T1/2 above
room temperature (300–368 K). While structural analysis by
X-ray crystallography shows that the majority of these compounds are
low-spin in the solid state (and remain unchanged upon heating), we
find that packing effects can override this preference and give rise
to either rigorously high-spin (6) or gradual spin-crossover
behavior (5) also in the solid state. Density functional
theory calculations are used to delineate the empirical trends in
solution spin-crossover thermodynamics. In all cases, the stabilization
of the low-spin state is due to the π-acceptor properties of
the formazanate ligand, resulting in an “inverted” ligand
field, with an approximate “two-over-three” splitting
of the d-orbitals and a high degree of metal–ligand covalency
due to metal → ligand π-backdonation. The computational
data indicate that the electronic nature of the para-substituent has a different influence depending on whether it is
present at the C–Ar or N–Ar rings, which is ascribed
to the opposing effect on metal–ligand σ- and π-bonding.
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Affiliation(s)
- Francesca Milocco
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Folkert de Vries
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Imke M A Bartels
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Remco W A Havenith
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.,Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.,Ghent Quantum Chemistry Group, Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281 (S3), B-9000 Gent, Belgium
| | - Jordi Cirera
- Departament de Química Inorgànica i Orgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
| | - Serhiy Demeshko
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Edwin Otten
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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13
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Znovjyak K, Seredyuk M, Malinkin SO, Shova S, Soliev L. Crystal structure of { N 1, N 3-bis-[(1-benzyl-1 H-1,2,3-triazol-4-yl)methyl-idene]-2,2-di-methyl-propane-1,3-di-amine}bis-(thio-cyanato-κ N)iron(II). Acta Crystallogr E Crystallogr Commun 2020; 76:1661-1664. [PMID: 33117585 PMCID: PMC7534255 DOI: 10.1107/s2056989020012608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 09/16/2020] [Indexed: 11/13/2023]
Abstract
The unit cell of the title compound, [FeII(NCS)2(C25H28N8)], consists of two charge-neutral complex mol-ecules related by an inversion centre. In the complex mol-ecule, the tetra-dentate ligand N 1,N 3-bis-[(1-benzyl-1H-1,2,3-triazol-4-yl)methyl-ene]-2,2-di-methyl-propane-1,3-di-amine coordinates to the FeII ion through the N atoms of the 1,2,3-triazole moieties and aldimine groups. Two thio-cyanate anions, coordinating through their N atoms, complete the coordination sphere of the central ion. In the crystal, neighbouring mol-ecules are linked through weak C-H⋯π, C-H⋯S and C-H⋯N inter-actions into a two-dimensional network extending parallel to (011). The inter-molecular contacts were qu-anti-fied using Hirshfeld surface analysis and two-dimensional fingerprint plots, revealing the relative contributions of the contacts to the crystal packing to be H⋯H (35.2%), H⋯C/C⋯H (26.4%), H⋯S/S⋯H (19.3%) and H⋯N/N⋯H (13.9%).
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Affiliation(s)
- Kateryna Znovjyak
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Maksym Seredyuk
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Sergey O. Malinkin
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv, 01601, Ukraine
| | - Sergiu Shova
- Department of Inorganic Polymers, "Petru Poni" Institute of Macromolecular, Chemistry, Romanian Academy of Science, Aleea Grigore Ghica Voda 41-A, Iasi, 700487, Romania
| | - Lutfullo Soliev
- Department of General and Inorganic Chemistry, Faculty of Chemistry, Tajik State Pedagogical University, Rudaki 121, 734003 Dushanbe, Tajikistan
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14
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Ghosh S, Chopra P, Wategaonkar S. C-HS interaction exhibits all the characteristics of conventional hydrogen bonds. Phys Chem Chem Phys 2020; 22:17482-17493. [PMID: 32531006 DOI: 10.1039/d0cp01508c] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This is a tale of a pair of a hydrogen bond donor and acceptor, namely the CH donor and sulphur acceptor, neither of which is a conventional hydrogen bond participant. Sulfur (S), being less electronegative (2.58) compared to its first row analogue oxygen (3.44), has not been considered as a potential HB acceptor for a long time. The C-HY (Y = HB acceptor) interaction has its own history of exhibiting omnidirectional shifts in the CH stretching frequency upon complex formation. Therefore, a systematic investigation of the C-HS interaction was the primary goal of the work presented here. Together with gas-phase vibrational spectroscopy and ab initio quantum chemical calculations, the nature and strength of the C-HS hydrogen bond (HB) have been investigated in the complexes of 1,2,4,5-tetracyanobenzene (TCNB) with various sulfur containing solvents. Despite the unconventional nature of both HB donor and HB acceptor (C-H and S, respectively), it was found that the C-HS hydrogen bond exhibits all the characteristics of the conventional hydrogen bond. The binding strength of the C-HS H-bond in these complexes was found to be comparable to that of the conventional hydrogen bonds. The unusual stabilities of these HBs have been mainly attributed to the attractive dispersion interaction.
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Affiliation(s)
- Sanat Ghosh
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India.
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15
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Książek M, Weselski M, Dreczko A, Maliuzhenko V, Kaźmierczak M, Tołoczko A, Kusz J, Bronisz R. Two ways of spin crossover in an iron(ii) coordination polymer associated with conformational changes of a bridging ligand. Dalton Trans 2020; 49:9811-9819. [DOI: 10.1039/d0dt01696a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural phase transition in [Fe(bbtre)3](ClO4)2·2CH3CN (bbtre = 1,4-di(1-ethyl-1,2,3-triazol-5-yl)butane) plays the role of a switch, allowing spin crossover to be carried out in two ways.
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Affiliation(s)
- Maria Książek
- Institute of Physics
- University of Silesia
- 41-500 Chorzów
- Poland
| | - Marek Weselski
- Faculty of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | | | | | | | | | - Joachim Kusz
- Institute of Physics
- University of Silesia
- 41-500 Chorzów
- Poland
| | - Robert Bronisz
- Faculty of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
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16
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Chand A, Biswal HS. Hydrogen Bonds with Chalcogens: Looking Beyond the Second Row of the Periodic Table. J Indian Inst Sci 2019. [DOI: 10.1007/s41745-019-00140-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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17
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Iron(II) Spin Crossover Complex with the 1,2,3-Triazole-Containing Linear Pentadentate Schiff-Base Ligand and the MeCN Monodentate Ligand. CRYSTALS 2019. [DOI: 10.3390/cryst9060276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A mononuclear iron(II) complex bearing the linear pentadentate N5 Schiff-base ligand containing two 1,2,3-triazole moieties and the MeCN monodentate ligand, [FeIIMeCN(L3-Me-3Ph)](BPh4)2·MeCN·H2O (1), have been prepared (L3-Me-3Ph = bis(N,N′-1-Phenyl-1H-1,2,3-triazol-4-yl-methylideneaminopropyl)methylamine). Variable-temperature magnetic susceptibility measurements revealed an incomplete one-step spin crossover (SCO) from the room-temperature low-spin (LS, S = 0) state to a mixture of the LS and high-spin (HS, S = 2) species at the higher temperature of around 400 K upon first heating, which is irreversible on the consecutive cooling mode. The magnetic modulation at around 400 K was induced by the crystal-to-amorphous transformation accompanied by the loss of lattice MeCN solvent, which was evident from powder X-ray diffraction (PXRD) studies and themogravimetry. The single-crystal X-ray diffraction studies showed that the complex is in the LS state (S = 0) between 296 and 387 K. In the crystal lattice, the complex-cations and B(1)Ph4− ions are alternately connected by intermolecular CH···π interactions between the methyl group of the MeCN ligand and phenyl groups of B(1)Ph4− ions, forming a 1D chain structure. The 1D chains are further connected by P4AE (parallel fourfold aryl embrace) interactions between two neighboring complex-cations, constructing a 2D extended structure. B(2)Ph4− ions and MeCN lattice solvents exist in the spaces of the 2D layer. DFT calculations verified that the 1,2,3-triazole-containing ligand L3-Me-3Ph gives a stronger ligand field around the octahedral coordination environment of the iron(II) ion than the analogous imidazole-containing ligand H2L2Me (= bis(N,N′-2-methylimidazol-4-yl-methylideneaminopropyl)methylamine) of the known compound [FeIIMeCN(H2L2Me)](BPh4)1.5·Cl0.5·0.5MeCN (2) reported by Matsumoto et al. (Nishi, K.; Fujinami, T.; Kitabayashi, A.; Matsumoto, N. Tetrameric spin crossover iron(II) complex constructed by imidazole⋯chloride hydrogen bonds. Inorg. Chem. Commun. 2011, 14, 1073–1076), resulting in the much higher spin transition temperature of 1 than that of 2.
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18
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High-temperature Spin Crossover of a Solvent-Free Iron(II) Complex with the Linear Hexadentate Ligand [Fe(L2-3-2Ph)](AsF6)2 (L2-3-2Ph = bis[N-(1-Phenyl-1H-1,2,3-triazol-4-yl)methylidene-2-aminoethyl]-1,3- propanediamine). MAGNETOCHEMISTRY 2019. [DOI: 10.3390/magnetochemistry5010010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A novel mononuclear iron(II) complex with a linear hexadentate N6 ligand, containing two 1,2,3-triazole moieties, [Fe(L2-3-2Ph)](AsF6)2 (1), was synthesized (L2-3-2Ph = bis[N-(1-Phenyl-1H-1,2,3-triazol-4-yl)methylidene-2-aminoethyl]-1,3-propanediamine). Variable-temperature magnetic susceptibility measurements revealed a gradual one-step spin crossover (SCO) between the high-spin (HS, S = 2) and low-spin (LS, S = 0) states above room temperature (T1/2 = 468 K). The spin transition was further confirmed by differential scanning calorimetry (DSC). A single-crystal X-ray diffraction study showed that the complex was in the LS state (S = 0) at room temperature (296 K). In the crystal lattice, a three-dimensional (3D) supramolecular network was formed by intermolecular CH⋯ and – interactions of neighboring complex cations [Fe(L2-3-2Ph)]2+. AsF6− ions were located interstitially in the 3D network of complex cations, with no solvent-accessible voids. The crystal structure at 448 K (mixture of HS and LS species) was also successfully determined thanks to the thermal stability of the solvent-free crystal.
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19
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Senthil Kumar K, Bayeh Y, Gebretsadik T, Elemo F, Gebrezgiabher M, Thomas M, Ruben M. Spin-crossover in iron(ii)-Schiff base complexes. Dalton Trans 2019; 48:15321-15337. [DOI: 10.1039/c9dt02085c] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A collective overview of iron(ii)-Schiff base complexes, showing abrupt and hysteretic SCO suitable for device applications, and the structure–property relationships governing the SCO of the complexes in the solid-state is presented.
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Affiliation(s)
- Kuppusamy Senthil Kumar
- Institut de Physique et de Chimie des Matériaux-Université de Strasbourg23
- F-67034 Strasbourg
- France
| | - Yosef Bayeh
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Tesfay Gebretsadik
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Fikre Elemo
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Mamo Gebrezgiabher
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Madhu Thomas
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Mario Ruben
- Institut de Physique et de Chimie des Matériaux-Université de Strasbourg23
- F-67034 Strasbourg
- France
- Institute of Nanotechnology
- Karlsruhe Institute of Technology
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20
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Tailleur E, Marchivie M, Negrier P, Denux D, Massip S, Mondieig D, Chastanet G, Guionneau P. Using polymorphism to master the spin crossover mechanism in [Fe(PM-PeA)2(NCSe)2]. CrystEngComm 2019. [DOI: 10.1039/c9ce01137d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Polymorphism drives the mechanism of the spin-crossover in [Fe(PM-PeA)2(NCSe)2] single-crystals.
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21
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Chen XQ, Cai YD, Ye YS, Tong ML, Bao X. Investigation of SCO property–structural relationships in a family of mononuclear Fe(ii) complexes. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00577c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Six complexes with the formula [FeL(NCE)2] (E = S, Se, BH3) have been reported. A survey of the magneto-structural relationship has been conducted.
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Affiliation(s)
- Xiu-Qin Chen
- School of Chemical Engineering
- Nanjing University of Science and Technology
- 210094 Nanjing
- P. R. China
| | - You-De Cai
- School of Chemical Engineering
- Nanjing University of Science and Technology
- 210094 Nanjing
- P. R. China
| | - Yi-Shan Ye
- School of Chemical Engineering
- Nanjing University of Science and Technology
- 210094 Nanjing
- P. R. China
| | - Ming-Liang Tong
- School of Chemistry
- Sun Yat-Sen University
- 510275 Guangzhou
- P. R. China
| | - Xin Bao
- School of Chemical Engineering
- Nanjing University of Science and Technology
- 210094 Nanjing
- P. R. China
- State Key Laboratory of Coordination Chemistry
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22
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Fletcher JT, Hanson MD, Christensen JA, Villa EM. Revisiting ring-degenerate rearrangements of 1-substituted-4-imino-1,2,3-triazoles. Beilstein J Org Chem 2018; 14:2098-2105. [PMID: 30202463 PMCID: PMC6122373 DOI: 10.3762/bjoc.14.184] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 07/26/2018] [Indexed: 11/23/2022] Open
Abstract
The 1-substituted-4-imino-1,2,3-triazole motif is an established component of coordination compounds and bioactive molecules, but depending on the substituent identity, it can be inherently unstable due to Dimroth rearrangements. This study examined parameters governing the ring-degenerate rearrangement reactions of 1-substituted-4-imino-1,2,3-triazoles, expanding on trends first observed by L’abbé et al. The efficiency of condensation between 4-formyltriazole and amine reactants as well as the propensity of imine products towards rearrangement was each strongly influenced by the substituent identity. It was observed that unsymmetrical condensation reactions conducted at 70 °C produced up to four imine products via a dynamic equilibrium of condensation, rearrangement and hydrolysis steps. Kinetic studies utilizing 1-(4-nitrophenyl)-1H-1,2,3-triazole-4-carbaldehyde with varying amines showed rearrangement rates sensitive to both steric and electronic factors. Such measurements were facilitated by a high throughput colorimetric assay to directly monitor the generation of a 4-nitroaniline byproduct.
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Affiliation(s)
- James T Fletcher
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
| | - Matthew D Hanson
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
| | - Joseph A Christensen
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
| | - Eric M Villa
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
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23
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Hagiwara H, Tanaka T, Hora S. Synthesis, structure, and spin crossover above room temperature of a mononuclear and related dinuclear double helicate iron(ii) complexes. Dalton Trans 2018; 45:17132-17140. [PMID: 27801445 DOI: 10.1039/c6dt02766k] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A mononuclear iron(ii) complex, [FeII(L1Me)2](PF6)2 (1), and a related dinuclear one, [Fe(L2C2)2](PF6)4·5H2O·MeCN (2), were prepared, where L1Me is a tridentate N3 coordinating Schiff-base ligand, 1-methyl-1,2,3-triazol-4-yl-methylideneamino-2-ethylpyridine, and L2C2 is a dimeric form ligand of L1Me, 1,1'-(1,2-ethanediyl)bis-1,2,3-triazol-4-yl-methylideneamino-2-ethylpyridine, and their magnetostructural relationships were investigated. Mononuclear 1 shows a gradual one-step spin crossover (SCO) from the low-spin (LS) state (S = 0) at room temperature (RT) to the mostly high-spin (HS) state (S = 2) at 470 K spanning a temperature range of more than 170 K, while dinuclear 2 shows an anomalous two-step SCO with a gradual transition in a first step from the LS-LS state at RT to around 432 K and then an abrupt spin transition centred at 432 K with 11 K wide hysteresis in a second step (T1/2↑ = 437 K and T1/2↓ = 426 K) reaching the mostly HS-HS state. Single crystal X-ray structure analyses revealed that the iron(ii) centre of mononuclear 1 has an N6 octahedral coordination environment with two tridentate L1Me ligands, while the complex-cation of 2 has a dinuclear double helicate architecture as though a dimeric form of two complex-cations of 1 replaced their methyl group with a bridging ethylene chain. Both complexes have a cationic two-dimensional (2D) structure in which the 2D layer of mononuclear 1 is constructed of intermolecular CHN hydrogen bonds between adjacent complex-cations, while that of dinuclear 2 is constructed of both intermolecular π-π and CH/π interactions between neighboring helicates.
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Affiliation(s)
- Hiroaki Hagiwara
- Department of Chemistry, Faculty of Education, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan.
| | - Tomoko Tanaka
- Department of Chemistry, Faculty of Education, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan.
| | - Shiori Hora
- Graduate School of Education, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
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24
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Takahashi K, Okai M, Mochida T, Sakurai T, Ohta H, Yamamoto T, Einaga Y, Shiota Y, Yoshizawa K, Konaka H, Sasaki A. Contribution of Coulomb Interactions to a Two-Step Crystal Structure Phase Transformation Coupled with a Significant Change in Spin Crossover Behavior for a Series of Charged FeII Complexes from 2,6-Bis(2-methylthiazol-4-yl)pyridine. Inorg Chem 2018; 57:1277-1287. [DOI: 10.1021/acs.inorgchem.7b02721] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kazuyuki Takahashi
- Department of Chemistry,
Graduate School of Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Mitsunobu Okai
- Department of Chemistry,
Graduate School of Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Tomoyuki Mochida
- Department of Chemistry,
Graduate School of Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Takahiro Sakurai
- Research Facility Center for Science and
Technology, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Hitoshi Ohta
- Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Takashi Yamamoto
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Yasuaki Einaga
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hisashi Konaka
- XRD Application & Software Development, Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima, Tokyo 196-8666, Japan
| | - Akito Sasaki
- XRD Application & Software Development, Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima, Tokyo 196-8666, Japan
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25
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Bartual-Murgui C, Piñeiro-López L, Valverde-Muñoz FJ, Muñoz MC, Seredyuk M, Real JA. Chiral and Racemic Spin Crossover Polymorphs in a Family of Mononuclear Iron(II) Compounds. Inorg Chem 2017; 56:13535-13546. [PMID: 29048915 DOI: 10.1021/acs.inorgchem.7b02272] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Understanding the origin of cooperativity and the equilibrium temperature of transition (T1/2) displayed by the spin-crossover (SCO) compounds as well as controlling these parameters are of paramount importance for future applications. For this task, the occurrence of polymorphism, presented by a number of SCO complexes, may provide deep insight into the influence of the supramolecular organization on the SCO behavior. In this context, herein we present a novel family of mononuclear octahedral FeII complexes with formula cis-[Fe(bqen)(NCX)2], where bqen is the chelating tetradentate ligand N,N'-bis(8-quinolyl)ethane-1,2-diamine and X = S, Se. Depending on the preparation method, these compounds crystallize in either the orthorhombic or the trigonal symmetry systems. While the orthorhombic phase is composed of a racemic mixture of mononuclear complexes (polymorph I), the trigonal phase contains only one of the two possible enantiomers (Λ or Δ), thereby generating a chiral crystal (polymorph II). The four derivatives undergo SCO behavior with well-differentiated T1/2 values occurring in the interval 90-233 K. On one hand, T1/2 is about 110 K (polymorph I) and 87 K (polymorph II) higher for the selenocyanate derivatives in comparison to those for their thiocyanate counterparts. These differences in T1/2 are ascribed not only to the higher ligand field induced by the selenocyanate anion but also to a remarkable difference in the structural reorganization of the [FeN6] coordination core upon SCO. Likewise, the higher cooperativity observed for the thiocyanate derivatives seems to be related to their stronger intermolecular interactions within the crystal. On the other hand, T1/2 is about 53 K (thiocyanate) and 29 K (selenocyanate) higher for the trigonal polymorph II in comparison to those for the orthorhombic polymorph I. These differences, and the small changes observed in cooperativity, stem from the slightly different hetero- and homochiral crystal packing generated by the cis-[Fe(bqen)(NCX)2] molecules, which determines subtle adaptations in the intermolecular contacts and the FeII coordination core.
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Affiliation(s)
- Carlos Bartual-Murgui
- Institut de Ciència Molecular (ICMol), Departament de Química Inorgànica, Universitat de València , C/Catedrático José Beltrán Martínez, 2, 46980 Paterna (Valencia), Spain
| | - Lucía Piñeiro-López
- Institut de Ciència Molecular (ICMol), Departament de Química Inorgànica, Universitat de València , C/Catedrático José Beltrán Martínez, 2, 46980 Paterna (Valencia), Spain
| | - F Javier Valverde-Muñoz
- Institut de Ciència Molecular (ICMol), Departament de Química Inorgànica, Universitat de València , C/Catedrático José Beltrán Martínez, 2, 46980 Paterna (Valencia), Spain
| | - M Carmen Muñoz
- Departamento de Física Aplicada, Universitat Politècnica de València , Camino de Vera s/n, 46022 Valencia, Spain
| | - Maksym Seredyuk
- Institut de Ciència Molecular (ICMol), Departament de Química Inorgànica, Universitat de València , C/Catedrático José Beltrán Martínez, 2, 46980 Paterna (Valencia), Spain.,Taras Shevchenko National University , Department of Chemistry, Volodymyrska Str. 64, Kyiv 01601, Ukraine
| | - José Antonio Real
- Institut de Ciència Molecular (ICMol), Departament de Química Inorgànica, Universitat de València , C/Catedrático José Beltrán Martínez, 2, 46980 Paterna (Valencia), Spain
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26
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Polymorphs of spin-crossover iron(II) complex fac -[Fe II (HL n -Pr ) 3 ]Cl·PF 6 (HL n -Pr = 2-methylimidazol-4-yl-methylideneamino- n -propyl): Assembly structures and scan rate dependent spin-crossover properties with thermal hysteresis. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.03.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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Abstract
A tandem method for preparing 4-formyl-1,2,3-triazoles via a two-step one-pot acetal cleavage/CuAAC reaction was developed. Using this method, 4-formyl-1,2,3-triazole analogs with both electron-withdrawing and electron-donating substituents were prepared in good yield and purity. Expansion of this method to a three-step tandem reaction that incorporates an additional step of azide substitution was also successful, circumventing the need for organic azide isolation. This one-pot method, noteworthy in its simplicity and mild conditions, utilizes practical, readily available reactants and relies on protic solvent to promote acid-catalyzed acetal cleavage.
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Affiliation(s)
- James T Fletcher
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
| | - Joseph A Christensen
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
| | - Eric M Villa
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, U.S.A
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28
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Bushuev MB, Vinogradova KA, Gatilov YV, Korolkov IV, Nikolaenkova EB, Krivopalov VP. Spin crossover in iron(II) hexafluorophosphate complexes with 2-(pyridin-2-yl)-4-(3,5-di-R-1H-pyrazol-1-yl)-6-methylpyrimidines. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.08.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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Liu X, Zhou J, Bao X, Yan Z, Peng G, Rouzières M, Mathonière C, Liu JL, Clérac R. Mononuclear Fe(II) Complexes Based on the Methylpyrazinyl-Diamine Ligand: Chemical-, Thermo- and Photocontrol of Their Magnetic Switchability. Inorg Chem 2017; 56:12148-12157. [PMID: 28937745 DOI: 10.1021/acs.inorgchem.7b01430] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two new mononuclear Fe(II) complexes, [Fe(2MeLpz)(NCX)2] (L = N,N'-dimethyl-N,N'-bis((pyrazin-2-yl)methyl)-1,2-ethanediamine and X = S (1), BH3 (2)), have been synthesized and characterized by single-crystal X-ray diffraction, magnetic, optical reflectivity, and photomagnetic measurements. They have similar FeN6 coordination environments offered by the tetradentate ligand with a cis-α conformation and two NCX- coligands in cis positions. However, 1 and 2 have different molecular arrangements and crystal packings, and are isolated in orthorhombic Pbnb and monoclinic C2/c space groups, respectively. 1 remains in a high spin state (S = 2) over all temperatures while 2 undergoes a spin transition around 168 K with a small thermal hysteresis of about 0.4 K (at a temperature scan rate of 1.3 K min-1). This phase transition, which can also be optically detected due to the associated marked change of the sample color, occurs between two structurally characterized phases, which exhibit Fe(II) complexes in their high spin and low spin states at high and low temperatures, respectively. The reversible photoswitching between these two states has also been confirmed at low temperatures using well separated wavelength irradiations.
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Affiliation(s)
- Xue Liu
- School of Chemical Engineering, Nanjing University of Science and Technology , 210094 Nanjing, P. R. China
| | - Jian Zhou
- School of Chemical Engineering, Nanjing University of Science and Technology , 210094 Nanjing, P. R. China
| | - Xin Bao
- School of Chemical Engineering, Nanjing University of Science and Technology , 210094 Nanjing, P. R. China
| | - Zheng Yan
- Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
| | - Guo Peng
- Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology , 210094 Nanjing, P. R. China
| | - Mathieu Rouzières
- CNRS, CRPP, UPR 8641, 33600 Pessac, France.,Univ. Bordeaux, CRPP, UPR 8641, 33600 Pessac, France
| | - Corine Mathonière
- CNRS, ICMCB, UPR 9048, 33600 Pessac, France.,Univ. Bordeaux, ICMCB, UPR 9048, 33600 Pessac, France
| | - Jun-Liang Liu
- CNRS, CRPP, UPR 8641, 33600 Pessac, France.,Univ. Bordeaux, CRPP, UPR 8641, 33600 Pessac, France
| | - Rodolphe Clérac
- CNRS, CRPP, UPR 8641, 33600 Pessac, France.,Univ. Bordeaux, CRPP, UPR 8641, 33600 Pessac, France
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31
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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.
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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
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32
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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]
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33
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Han WK, Li ZH, Zhu W, Li T, Li Z, Ren X, Gu ZG. Molecular isomerism induced Fe(ii) spin state difference based on the tautomerization of the 4(5)-methylimidazole group. Dalton Trans 2017; 46:4218-4224. [DOI: 10.1039/c7dt00260b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two iron(ii) structural isomers with only one methyl position difference in their ligands exhibit different spin states due to the competition of the electronic effect and steric crowding.
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Affiliation(s)
- Wang-Kang Han
- The Key Laboratory of Food Colloids and Biotechnology
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Zhi-Hua Li
- The Key Laboratory of Food Colloids and Biotechnology
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Wei Zhu
- The Key Laboratory of Food Colloids and Biotechnology
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Tao Li
- The Key Laboratory of Food Colloids and Biotechnology
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Zaijun Li
- The Key Laboratory of Food Colloids and Biotechnology
- 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
- The Key Laboratory of Food Colloids and Biotechnology
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
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34
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Wang X, Chen YF, Yan W, Cao LL, Ye YH. Synthesis and Biological Evaluation of Benzimidazole Phenylhydrazone Derivatives as Antifungal Agents against Phytopathogenic Fungi. Molecules 2016; 21:molecules21111574. [PMID: 27879685 PMCID: PMC6273319 DOI: 10.3390/molecules21111574] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 11/08/2016] [Accepted: 11/12/2016] [Indexed: 12/16/2022] Open
Abstract
A series of benzimidazole phenylhydrazone derivatives (6a–6ai) were synthesized and characterized by 1H-NMR, ESI-MS, and elemental analysis. The structure of 6b was further confirmed by single crystal X-ray diffraction as (E)-configuration. All the compounds were screened for antifungal activity against Rhizoctonia solani and Magnaporthe oryzae employing a mycelium growth rate method. Compound 6f exhibited significant inhibitory activity against R. solani and M. oryzae with the EC50 values of 1.20 and 1.85 μg/mL, respectively. In vivo testing demonstrated that 6f could effectively control the development of rice sheath blight (RSB) and rice blast (RB) caused by the above two phytopathogens. This work indicated that the compound 6f with a benzimidazole phenylhydrazone scaffold could be considered as a leading structure for the development of novel fungicides.
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Affiliation(s)
- Xing Wang
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China.
| | - Yong-Fei Chen
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China.
| | - Wei Yan
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China.
| | - Ling-Ling Cao
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China.
| | - Yong-Hao Ye
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China.
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35
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Li GL, Kanegawa S, Yao ZS, Su SQ, Wu SQ, Huang YG, Kang S, Sato O. Influence of Intermolecular Interactions on Valence Tautomeric Behaviors in Two Polymorphic Dinuclear Cobalt Complexes. Chemistry 2016; 22:17130-17135. [PMID: 27629522 DOI: 10.1002/chem.201603817] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Indexed: 11/05/2022]
Abstract
Two polymorphic structures have been well determined in a valence tautomeric (VT) dinuclear cobalt complex. These polymorphs showed distinct thermal- and photomagnetic behavior, and are thus ideal for studying the "pure" intermolecular factors to VT transitions. In polymorph 1A, the VT cations are arranged head-to-waist with their neighbors and exhibit weak π⋅⋅⋅π interactions, resulting in a gradual and incomplete thermal VT transition. In contrast, the cations in polymorph 1B are arranged head-to-tail and exhibit relatively strong π⋅⋅⋅π interactions, leading to an abrupt and complete thermal VT transition with adjustable hysteresis loop at around room temperature. The VT process for both polymorphs can be induced by light, but the light-excited state of 1B⋅2H2 O has a higher thermal relaxation temperature than that of 1A⋅3H2 O.
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Affiliation(s)
- Guo-Ling Li
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan
| | - Shinji Kanegawa
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan
| | - Zi-Shuo Yao
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan
| | - Sheng-Qun Su
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan
| | - Shu-Qi Wu
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan
| | - You-Gui Huang
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan
| | - Soonchul Kang
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan
| | - Osamu Sato
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan
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36
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Struch N, Wagner N, Schnakenburg G, Weisbarth R, Klos S, Beck J, Lützen A. Thiazolylimines as novel ligand-systems for spin-crossover centred near room temperature. Dalton Trans 2016; 45:14023-9. [DOI: 10.1039/c6dt02077a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new thiazolylimine ligand system for iron(ii) complexes which stabilises spin-crossover in solution and solid states with T1/2 temperatures around room temperature has been developed.
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Affiliation(s)
- N. Struch
- Kekulé-Institut für Organische Chemie und Biochemie
- Rheinische Friedrich-Wilhelms-Universität Bonn. Gerhard-Domagk-Straße 1
- 53121 Bonn
- Germany
| | - N. Wagner
- Institut für Anorganische Chemie
- Rheinische Friedrich-Wilhelms-Universität Bonn. Gerhard-Domagk-Straße 1
- 53121 Bonn
- Germany
| | - G. Schnakenburg
- Institut für Anorganische Chemie
- Rheinische Friedrich-Wilhelms-Universität Bonn. Gerhard-Domagk-Straße 1
- 53121 Bonn
- Germany
| | - R. Weisbarth
- Institut für Anorganische Chemie
- Rheinische Friedrich-Wilhelms-Universität Bonn. Gerhard-Domagk-Straße 1
- 53121 Bonn
- Germany
| | - S. Klos
- Institut für Anorganische Chemie
- Rheinische Friedrich-Wilhelms-Universität Bonn. Gerhard-Domagk-Straße 1
- 53121 Bonn
- Germany
| | - J. Beck
- Institut für Anorganische Chemie
- Rheinische Friedrich-Wilhelms-Universität Bonn. Gerhard-Domagk-Straße 1
- 53121 Bonn
- Germany
| | - A. Lützen
- Kekulé-Institut für Organische Chemie und Biochemie
- Rheinische Friedrich-Wilhelms-Universität Bonn. Gerhard-Domagk-Straße 1
- 53121 Bonn
- Germany
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