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• W2010315244 abstract "Crystallographic, magnetic, and Raman investigations of the mononuclear $[{text{Fe}}^{text{II}}(text{Hpy-DAPP})]{({text{BF}}_{4})}_{2}$ complex are presented. Its particular feature is a two-step thermal spin conversion in spite of a unique symmetry-independent iron site per unit cell. The plateau around 140 K is associated with a symmetry breaking visible by the appearance of weak $(0k0)$ $k$ odd Bragg peaks. Symmetries of the high-temperature high-spin state and of the low-temperature low-spin state are both monoclinic $P{2}_{1}/c$, so that the symmetry breaking on the plateau is associated with a reentrant phase transition. It is discussed in relation with Ising-type microscopic models. At the plateau level, the two symmetry-independent molecules differ both by their spin state and the conformation (chair versus twist-boat) of one metallocycle. At low-temperature photoinduced phenomena have been investigated: a partial phototransformation [light-induced excited spin-state trapping (LIESST) effect] is observed under visible red irradiation. Raman spectroscopy shows that the molecular photoinduced state is the high-spin one. Nevertheless, as no macroscopic symmetry breaking is observed, the unique average cationic $[{text{Fe}}^{text{II}}(text{Hpy-DAPP})]$ state of the unit cell is intermediate between pure low-spin and high-spin states and presents a conformational disorder for one metallocycle. Reverse-LIESST has also been evidenced using near infrared excitation. Thus, the mononuclear $[text{Fe}(text{Hpy-DAPP})]{({text{BF}}_{4})}_{2}$ compound offers the opportunity to discuss the interplay between spin conversion, molecular conformational change, and ordering processes." @default.
• W2010315244 created "2016-06-24" @default.
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• W2010315244 date "2010-12-10" @default.
• W2010315244 modified "2023-10-11" @default.
• W2010315244 title "Symmetry breaking and light-induced spin-state trapping in a mononuclear<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mrow><mml:mtext>II</mml:mtext></mml:mrow></mml:msup></mml:mrow></mml:math>complex with the two-step thermal conversion" @default.
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• W2010315244 doi "https://doi.org/10.1103/physrevb.82.214106" @default.
• W2010315244 hasPublicationYear "2010" @default.
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