Magnetic molecular metals based on the organic donor molecule BET (BET = bis(ethylenethio)tetrathiafulvalene): The series BET2[MCl4] (M3⊕ = Ga, Fe)

Advanced Materials

Volumn 9, Issue 12, 1997, Pages 984-987

  Coronado, Eugenio ^a   Falvello, Lawrence R ^b   Galán Mascarós, José R ^a   Giménez Saiz, Carlos ^a   Gómez García, Carlos J ^a   Lauhkin, Vladimir N ^c,d   Pérez Benítez, Aarón ^c   Rovira, Concepció ^c   Veciana, Jaume ^c  

^a UNIVERSITY OF VALENCIA   (Spain)

^b UNIVERSITY OF ZARAGOZA   (Spain)

^c CSIC   (Spain)

^d INSTITUTE OF PROBLEMS OF CHEMICAL PHYSICS   (Russian Federation)

Author keywords

[No Author keywords available]

Indexed keywords

CHARGE TRANSFER; CRYSTAL STRUCTURE; ELECTRIC CONDUCTIVITY OF SOLIDS; GALLIUM COMPOUNDS; IRON COMPOUNDS; MAGNETIC MATERIALS; MAGNETIC PERMEABILITY MEASUREMENT; MOLECULAR STRUCTURE; ORGANOMETALLICS; SALTS; SULFUR COMPOUNDS; THERMAL EFFECTS;

MAGNETIC MOLECULAR CONDUCTORS;

ORGANIC CONDUCTORS;

EID: 0031246247     PISSN: 09359648     EISSN: None     Source Type: Journal    
DOI: 10.1002/adma.19970091213     Document Type: Article

References (17)

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4. See, e.g., E. Coronado, J. R. Galán Mascarós, C. Giménez-Saiz, C. J. Gómez García, in Magnetism: A Supramolecular Function (Ed: O. Kahn), NATO ASI Series, Vol.C484, Kluwer Academic, Dordrect, The Netherlands 1996, p. 281.
5. M. Almeida, V. Gama, R. T. Henriques, L. Alcácer, in Inorganic and Organometallic Polymers with Special Properties (Ed: R. M. Laine), Kluwer, Dordrecht, The Netherlands 1992, pp. 163-177.
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10. a) J. Tarres, N. Santalo, M. Mas, E. Molins, J. Veciana, C. Rovira, S. Yang, H. Lee, D. O. Cowan, M. L. Doublet, E. Canadell, Chem. Mater. 1995, 7, 1558.
11. b) E. Ribera, J. Tarrés, V. Laukhin, E. Canadell, M. Mas, E. Molins, J. Veciana, C. Rovira, Synth. Met., in press.
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13. Single crystals of these two radical salts were obtained from the electrochemical oxidation of neutral BET in the presence of the tetraethylammonium or tetraphenylphosphonium salt of the corresponding anion in a chlorobenzene-ethanol mixture. The intensity of the current was held at 0.7 mA and after 2 weeks shiny black needle-like crystals were carefully collected and air dried at room temperature.
14. 3. These are very close to those obtained in the Ga derivative, which support the isostructurality of the two salts.
15. -1 at 2 K. Compared with the Fe derivative the organic contribution is only relevant at T > 100 K, being completely negligible at lower temperatures.
16. In particular, the resulting D value is overestimated since antiferromagnetic dipolar interactions have not been taken into account in the fit of the magnetic data. In fact the D parameter must be seen as an effective one that accounts from the single ion anisotropy and that from dipolar Fe-Fe interactions. Explicit consideration of this last effect in the fit (through a Curie-Weiss parameter θ) results in a reduction of D, without modifying the J value.
17. 4 anions has recently been reported. However, in this case short Cl⋯Cl contacts have been seen that are the origin of this magnetic coupling: J. A. Ayllon, I. C. Santos, R. T. Henriques, M. Almeida, E. B. Lopes, J. Morgado, L. Alcacer, L. F. Veiros, M. T. Duarte, J. Chem. Soc., Dalton Trans. 1995, 3543.