Room-Temperature Magnetic Bistability in a Salt of Organic Radical Ions
International audience; Cocrystallization of 7,7′,8,8′-tetracyanoquinodimethane radical anion (TCNQ −•) and 3-methylpyridinium-1,2,3,5dithiadiazolyl radical cation (3-MepyDTDA +•) afforded isostructural acetonitrile (MeCN) or propionitrile (EtCN) solvates containing cofacial π dimers of homologous components. Loss of lattice solvent from the diamagnetic solvates above 366 K affords a high-temperature paramagnetic phase containing discrete TCNQ −• and weakly bound π dimers of 3-MepyDTDA +• , as evidenced by X-ray diffraction methods and magnetic susceptibility measurements. Below 268 K, a first-order phase transition occurs, leading to a low-temperature diamagnetic phase with TCNQ −• σ dimer…
Role of Alkyl Substituent and Solvent on the Structural, Thermal, and Magnetic Properties of Binary Radical Salts of 1,2,3,5-Dithia- or Diselenadiazolyl Cations and the TCNQ Anion
The synthesis, structural, thermal, and magnetic properties of a series of simple binary organic salts based on the radical anion of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 4-(N-alkylpyridinium-3-yl)-1,2,3,5-dithiadiazolyl (DTDA), 1R (R = Et, Pr, Bu), radical cations and their heavier selenium analogues (DSDA), 2R, are described. Single-crystal X-ray structural analyses reveal that short alkyl substituents on the pyridinium moiety of DTDA/DSDA cations lead to crystallization of isostructural acetonitrile (MeCN) solvates 1Et·MeCN, 1Pr·MeCN, 2Et·MeCN, and 2Pr·MeCN with trans-cofacial DTDA radical cation and eclipsed-cofacial TCNQ radical anion dimers. A slight increase in the substituent …
CCDC 2181987: Experimental Crystal Structure Determination
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CCDC 2097023: Experimental Crystal Structure Determination
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CCDC 2182640: Experimental Crystal Structure Determination
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CCDC 2097022: Experimental Crystal Structure Determination
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CCDC 2097021: Experimental Crystal Structure Determination
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CCDC 2097025: Experimental Crystal Structure Determination
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CCDC 2181982: Experimental Crystal Structure Determination
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CCDC 2181976: Experimental Crystal Structure Determination
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CCDC 2181985: Experimental Crystal Structure Determination
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CCDC 2182780: Experimental Crystal Structure Determination
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CCDC 2181981: Experimental Crystal Structure Determination
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CCDC 2181983: Experimental Crystal Structure Determination
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CCDC 2182311: Experimental Crystal Structure Determination
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CCDC 2182459: Experimental Crystal Structure Determination
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CCDC 2181984: Experimental Crystal Structure Determination
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CCDC 2181988: Experimental Crystal Structure Determination
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CCDC 2207551: Experimental Crystal Structure Determination
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CCDC 2181980: Experimental Crystal Structure Determination
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CCDC 2181989: Experimental Crystal Structure Determination
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CCDC 2181977: Experimental Crystal Structure Determination
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CCDC 2181986: Experimental Crystal Structure Determination
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CCDC 2097024: Experimental Crystal Structure Determination
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CCDC 2181974: Experimental Crystal Structure Determination
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CCDC 2182178: Experimental Crystal Structure Determination
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