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• W2045845186 abstract "Abstract A remarkable feature of the spin‐crossover process in several dinuclear iron( II ) compounds is a plateau in the two‐step transition curve. Up to now, it has not been possible to analyse the spin state of dinuclear pairs that constitute such a plateau, due to the relative high temperatures at which the transition takes place in complexes investigated so far. We solved this problem by experimentally studying a novel dinuclear spin‐crossover compound [{Fe(phdia)(NCS) 2 } 2 (phdia)] (phdia: 4,7‐phenanthroline‐5,6‐diamine). We report here on the synthesis and characterisation of this system, which exhibits a two‐step spin transition at T c1 =108 K and T c2 =80 K, displaying 2 K and 7 K wide thermal hysteresis loops in the upper and the lower steps, respectively. A plateau of approximately 20 K width centred at about 90 K, which corresponds to the 50 % of the spin conversion, separates the two transitions. The composition of the plateau was identified in metastable state after quenching to 4.2 K by means of Mössbauer spectroscopy in an external magnetic field. Such experiments revealed that the plateau consists mainly of [HS–LS] pairs (HS=high spin, LS=low spin) and confirmed the hypothesis that the spin conversion in dinuclear entities proceeds through [LS–LS]↔[HS–LS]↔[HS–HS] pairs. The results are discussed in terms of a thermodynamic model based on the regular solution theory adapted for dinuclear spin‐crossover compounds." @default.
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• W2045845186 date "2004-03-01" @default.
• W2045845186 modified "2023-10-17" @default.
• W2045845186 title "On the Nature of the Plateau in Two‐Step Dinuclear Spin‐Crossover Complexes" @default.
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• W2045845186 doi "https://doi.org/10.1002/chem.200305275" @default.
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