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• W2999693949 abstract "A trend between the degree of steric congestion of the Fe(II) coordination environment and the extent of spin transition (percentage completeness) has been observed in a series of halide salts of a dinuclear triple helicate architecture with the general form [Fe2L3]X4 (where X = Cl- for 1, Br- for 2, and (I-)3/I3- for 3, and L is (1E,1'E)-N,N'-(oxybis(4,1-phenylene))bis(1-(1H-imidazol-4-yl)methanimine). Crystal packing densities of adjacent helicates were found to decrease with increasing anion size. Greater steric congestion by neighboring helicates favored the [HS-HS] state of the dinuclear triple helicate architecture. As a result, the highly crowded Cl- salt (1) did not undergo spin-crossover (SCO), the more congested Br- salt (2) underwent an incomplete solvent-dependent transition, and the least crowded (I-)3/I3- analogue (3) exhibited a full SCO from the [HS-HS] ↔ [LS-LS] state. Furthermore, an interesting two-step transition was observed in the Br- salt, exhibiting a 28 K thermal hysteresis in the higher temperature step, the largest thermal hysteresis reported to date for a Fe(II) dinuclear triple helicate system. Variable-temperature single-crystal X-ray diffraction (SCXRD) analysis of 2 demonstrated that this two-step profile was found to be the result of crystallographic parameters evolving in a two-step manner with temperature, rather than a crystallographic phase change." @default.
• W2999693949 created "2020-01-23" @default.
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• W2999693949 date "2020-01-09" @default.
• W2999693949 modified "2023-09-25" @default.
• W2999693949 title "A Rare Example of a Complete, Incomplete, and Non-Occurring Spin Transition in a [Fe₂<b>L</b>₃]X₄ Series Driven by a Combination of Solvent-and Halide-Anion-Mediated Steric Factors" @default.
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• W2999693949 doi "https://doi.org/10.1021/acs.inorgchem.9b02995" @default.
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• W2999693949 hasPublicationYear "2020" @default.
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