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Magnetic Sponge with Neutral-Ionic Phase Transitions
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DOI：10.1002/advs.201700526.png)
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Abstract
En 中文
Phase transitions caused by the charge instability between the neutral and ionic phases of compounds, i.e., N-I phase transitions, provide avenues for switching the intrinsic properties of compounds related to electron/spin correlation and dipole generation as well as charge distribution. However, it is extremely difficult to control the transition temperature (T-c) for the N-I phase transition, and only chemical modification based on the original material have been investigated. Here, a design overview of the tuning of N-I phase transition by interstitial guest molecules is presented. This study reports a new chain coordination-polymer [Ru-2(3,4-Cl2PhCO2)(4)TCNQ(EtO)(2)]center dot DCE (1-DCE; 3,4-Cl2PhCO2-= 3,4-dichlorobenzoate; TCNQ(EtO)(2) 2,5-diethoxy-7,7,8,8-tetra-cyanoquinodimethane; and DCE = 1,2-dichloroethane) that exhibits a one-step N-I transition at 230 K (= T-c) with the N-and I-states possessing a simple paramagnetic state and a ferrimagnetically correlated state for the high-and low-temperature phases, respectively. The T-c continuously decreases depending on the content of DCE, which eventually disappears with the complete evacuation of DCE, affording solvent-free compound 1 with the N-state in the entire temperature range (this behavior is reversible). This is an example of tuning the in situ T-c for the N-I phase transition via the control of the interstitial guest molecules.
Keywords:
chain structures
donor-acceptor systems
host-guest chemistry
magnetic properties
neutral-ionic phase transitions
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