(n-Bu4N)(2)[Fe(dcbdt)(2)](2). Synthesis, crystal structure and magnetic characterisation


The (n-Bu4N)(2)[Fe(dcbdt)(2)](2) complex, where 4,5-dicyanobenzene-1,2-dithiolate (dcbdt), was prepared and characterised by X-ray diffraction, Mossbauer spectroscopy and magnetisation measurements. The crystal structure as determined by single crystal X-ray diffraction is triclinic, space group P (1) over bar with cell parameters a = 9.5660(1) Angstrom, b = 13.0200(2) Angstrom, c = 16.0850(2) Angstrom, alpha = 67.554degrees(1), beta = 86.797degrees(1), gamma = 70.523degrees(1), V = 1738.77(4) Angstrom(3) and it consists in strongly dimerised [Fe(dcbdt)(2)](-) units, which are stacked side by side as chains along a. The magnetic susceptibility shows that the [Fe(dcbdt)(2)](-) units have a low spin S = 1/2 configuration and, besides a strong intradimer antiferromagnetic interaction, present also a significant interdinter antiferromagnetic interaction mediated by short side contacts. (C) 2003 Elsevier Science Ltd. All rights reserved.




Chemistry; Crystallography


Alves, H; Simao, D; Novais, H; Santos, IC; Gimenez-Saiz, C; Gama, V; Waerenborgh, JC; Henriques, RT; Almeida, M

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