EXAFS and X-ray powder diffraction studies of the spin transition molecular materials [Fe(Htrz)2(trz)](BF4) and [Fe(Htrz)3](BF4)2.H2O (Htrz = 1,2,4-4H-triazole; trz = 1,2,4-triazolato)

Michalowicz, Alain; Moscovici, J.; Ducourant, C.; Cracco, Denis; Kahn, Olivier

doi:10.1021/cm00058a013

Cited by 126 publications

(92 citation statements)

References 3 publications

(4 reference statements)

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“…[3][4][5][6] These compounds exhibit cooperative spin transitions between low-spin (LS) and high-spin (HS) states around room temperature, with large thermal hysteresis and a wellpronounced thermochromic effect. 7 [Fe(RTrz) 3 ][X]ÁxH 2 O polymers (RTrz = 4-substituted-1,2,4-triazole, X = counter anion and xH 2 O stands for non-coordinated water molecules) form a unique class of spin-crossover materials. This is due to their synthetic versatility and the sensitivity of the environment of the iron sites within polymer chains of different lengths and structures that can be diverted to tune the spin-crossover properties.…”

Section: Introductionmentioning

confidence: 99%

Preserving the spin transition properties of iron-triazole coordination polymers within silica-based nanocomposites

et al. 2017

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Preserving the spin transition properties of iron-triazole coordination polymers within silica-based nanocomposites †T. Coradin * a and C. Roux* a One dimensional iron(II) coordination polymers formed from 1,2,4-triazole bridging ligands are a unique class of spin-crossover materials (SCO). The integration of those coordination polymers into devices for practical applications remains a major challenge. Using a nanocomposite approach based on the control of coordination polymer interactions with chemically engineered silica particles, we show that we can achieve in situ gelation, while preserving the SCO properties of the solid state. Tuning the interface between the two phases of a composite provides a unique way to synergistically adjust the material's structure and the cooperativity associated with its transition properties. The strategy described here should allow for bridging the gap between soft and crystalline functional inorganic materials.

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Section: Introductionmentioning

confidence: 99%

Preserving the spin transition properties of iron-triazole coordination polymers within silica-based nanocomposites

et al. 2017

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“…Several crystal structures of these model compounds have been solved [22Ϫ24] or have been studied by EXAFS spectroscopy. [25] It was with this goal in mind that we decided to investigate the structure and magnetic properties of the new trinuclear compound of formula [Fe 3 (hyetrz) 6 (H 2 O) 6 ](CF 3 SO 3 ) 6 with hyetrz ϭ 4-(2Ј-hydroxyethyl)-1,2,4-triazole (see Scheme 1). Scheme 1.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structure, Magnetic Properties and57Fe Mössbauer Spectroscopy of the New Trinuclear [Fe3(4-(2′-hydroxyethyl)-1,2,4-triazole)6(H2O)6](CF3SO3)6 Spin Crossover Compound

Garcia

Guionneau

Bravic

et al. 2000

Eur. J. Inorg. Chem.

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“…These correspond to several kinds of distances such as Fe-N(2), C(5), Fe-N(3), C(4) (Scheme 1), and Fe with its two nearest Fe neighbours. [28] According to a previous study, [29] the peak at about 7.0 Å for the LS triazole-based complexes is ascribed to the FeFe-Fe alignment, the intensity of which is strongly enhanced due to the multiple-scattering focusing effect of the collinearly arranged Fe chains. [28] The presence of this peak provides confirmation of the polymeric structure of 1.…”

Section: Exafs and Xanes Characterisation Of Compoundmentioning

confidence: 78%

“…Similar materials have been investigated by means of EXAFS analysis in previous studies and their linear local structure deduced. [28][29][30] The complex shown in Scheme 2 is composed of triazole moieties and iron(II) ions arranged in a one-dimensional fashion, with the N-N groups of the triazoles bridging adjacent metal centres. The spectrum at 80 K consists of five main peaks (Figure 4c).…”

Section: Exafs and Xanes Characterisation Of Compoundmentioning

confidence: 99%

Cooperative Spin‐Crossover Behaviour in Polymeric 1D Fe^II Coordination Compounds: [{Fe(tba)₃}X₂]·nH₂O

et al. 2007

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A new family of 1D cooperative spin-crossover polymers with general formula [{Fe(tba) 3 }X 2 ]·nH 2 O [tba = N-(4H-1,2,4-triazol-4-yl)benzamide; X = CF 3 SO 3 -, n = 2 (1), n = 0 (4); BF 4 -, n = 3 (2), n = 0 (5); 4-CH 3 C 6 H 4 SO 3 -, n = 3 (3), n = 0 (6)] has been synthesised and characterised using a series of spectroscopic methods, X-ray powder diffraction, magnetic susceptibility measurements and differential scanning calorimetry. The copper analogue of 1, [{Cu(tba) 3 }(CF 3 SO 3 ) 2 ]·3H 2 O (7), has also been synthesised and its crystal structure solved at 293 K. Compound 7 crystallises in the P1 space group. The bidentate N-(4H-1,2,4-triazol-4-yl)benzamide ligand bridges the copper ions through the 1,2-nitrogen positions leading to a one-dimensional infinite polymer. The EXAFS data collected at 80 K for 1 agree perfectly with a linear chain structure, as observed for 7, with [Fe(tba) 3 ] chromophores linked to each other through the adjacent nitrogen atoms of three N- (4H-1,2,4-triazole-4-yl)benzamide ligands. IR spectroscopic studies confirm the retention of the C 2v symmetry for the triazole rings in 2 and 3, thereby suggesting a similar chainlike arrangement in these compounds. Compound 1 is

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EXAFS and X-ray powder diffraction studies of the spin transition molecular materials [Fe(Htrz)2(trz)](BF4) and [Fe(Htrz)3](BF4)2.H2O (Htrz = 1,2,4-4H-triazole; trz = 1,2,4-triazolato)

Cited by 126 publications

References 3 publications

Preserving the spin transition properties of iron-triazole coordination polymers within silica-based nanocomposites

Preserving the spin transition properties of iron-triazole coordination polymers within silica-based nanocomposites

Synthesis, Crystal Structure, Magnetic Properties and57Fe Mössbauer Spectroscopy of the New Trinuclear [Fe3(4-(2′-hydroxyethyl)-1,2,4-triazole)6(H2O)6](CF3SO3)6 Spin Crossover Compound

Cooperative Spin‐Crossover Behaviour in Polymeric 1D Fe^II Coordination Compounds: [{Fe(tba)₃}X₂]·nH₂O

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EXAFS and X-ray powder diffraction studies of the spin transition molecular materials [Fe(Htrz)2(trz)](BF4) and [Fe(Htrz)3](BF4)2.H2O (Htrz = 1,2,4-4H-triazole; trz = 1,2,4-triazolato)

Cited by 126 publications

References 3 publications

Preserving the spin transition properties of iron-triazole coordination polymers within silica-based nanocomposites

Preserving the spin transition properties of iron-triazole coordination polymers within silica-based nanocomposites

Synthesis, Crystal Structure, Magnetic Properties and57Fe Mössbauer Spectroscopy of the New Trinuclear [Fe3(4-(2′-hydroxyethyl)-1,2,4-triazole)6(H2O)6](CF3SO3)6 Spin Crossover Compound

Cooperative Spin‐Crossover Behaviour in Polymeric 1D FeII Coordination Compounds: [{Fe(tba)3}X2]·nH2O

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Cooperative Spin‐Crossover Behaviour in Polymeric 1D Fe^II Coordination Compounds: [{Fe(tba)₃}X₂]·nH₂O