Fifty Years of Mössbauer Spectroscopy in Solid State Research – Remarkable Achievements, Future Perspectives

Gütlich, Philipp

doi:10.1002/zaac.201100416

Cited by 75 publications

(73 citation statements)

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“…Temperature-dependent solid-state SQUID measurement and zero-field 57 Fe Mössbauer spectroscopy confirmed the total S = 2 ground state (χ M T = 3.7 cm 3 mol –1 K or μ eff = 5.44 μ B ) and an Fe III oxidation state (δ = 0.42 mm/s, Δ E Q = 0.85 mm/s), respectively (Figure 2). 17 …”

Section: Resultsmentioning

confidence: 99%

Catalytic Synthesis of N-Heterocycles via Direct C(sp³)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand

et al. 2017

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Coordination of FeCl3 to the redox-active pyridine–aminophenol ligand NNOH2 in the presence of base and under aerobic conditions generates FeCl2(NNOISQ) (1), featuring high-spin FeIII and an NNOISQ radical ligand. The complex has an overall S = 2 spin state, as deduced from experimental and computational data. The ligand-centered radical couples antiferromagnetically with the Fe center. Readily available, well-defined, and air-stable 1 catalyzes the challenging intramolecular direct C(sp3)–H amination of unactivated organic azides to generate a range of saturated N-heterocycles with the highest turnover number (TON) (1 mol% of 1, 12 h, TON = 62; 0.1 mol% of 1, 7 days, TON = 620) reported to date. The catalyst is easily recycled without noticeable loss of catalytic activity. A detailed kinetic study for C(sp3)–H amination of 1-azido-4-phenylbutane (S1) revealed zero order in the azide substrate and first order in both the catalyst and Boc2O. A cationic iron complex, generated from the neutral precatalyst upon reaction with Boc2O, is proposed as the catalytically active species.

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Section: Resultsmentioning

confidence: 99%

Catalytic Synthesis of N-Heterocycles via Direct C(sp³)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand

et al. 2017

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“…The condition to fulfil in order to observe thermal spin crossover is Δ E HL ≈ k B T. Increasing the temperature favors the HS state, decreasing it favors the LS state [23]. (Reproduced with permission from [36]. Copyright 2012 Wiley-VCH Verlag GmbH & Co. KGaA).…”

Section: Reviewmentioning

confidence: 99%

Section: Reviewmentioning

confidence: 99%

“…57 Fe Mössbauer spectroscopy [36,77–81] has proved to be a most powerful tool in probing the oxidation and spin states of iron in coordination compounds. Two of the most important parameters derived from a Mössbauer spectrum, i.e., the isomer shift δ and the quadrupole splitting Δ E Q , vary significantly between iron(II)-HS and iron(II)-LS.…”

Section: Reviewmentioning

confidence: 99%

“…Below T 1/2 , the compound is in the LS state, and the resonance signal (blue) has changed dramatically. Details about the different isomer shift values and the origin and size of the quadrupole splitting of the two spin states of iron(II) are explained elsewhere [36,77–81]. …”

Section: Reviewmentioning

confidence: 99%

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Spin state switching in iron coordination compounds

Gütlich¹,

Gaspar²,

Garcia³

2013

Beilstein J. Org. Chem.

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664

608

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

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Spectroscopic Analysis of Nanocarbon‐Based non‐precious Metal Catalyst for ORR

Kramm

2015

Nanocarbons for Advanced Energy Conversion

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Fifty Years of Mössbauer Spectroscopy in Solid State Research – Remarkable Achievements, Future Perspectives

Cited by 75 publications

References 72 publications

Catalytic Synthesis of N-Heterocycles via Direct C(sp³)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand

Catalytic Synthesis of N-Heterocycles via Direct C(sp³)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand

Spin state switching in iron coordination compounds

Spectroscopic Analysis of Nanocarbon‐Based non‐precious Metal Catalyst for ORR

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Fifty Years of Mössbauer Spectroscopy in Solid State Research – Remarkable Achievements, Future Perspectives

Cited by 75 publications

References 72 publications

Catalytic Synthesis of N-Heterocycles via Direct C(sp3)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand

Catalytic Synthesis of N-Heterocycles via Direct C(sp3)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand

Spin state switching in iron coordination compounds

Spectroscopic Analysis of Nanocarbon‐Based non‐precious Metal Catalyst for ORR

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Catalytic Synthesis of N-Heterocycles via Direct C(sp³)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand

Catalytic Synthesis of N-Heterocycles via Direct C(sp³)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand