J. Phys. IV France 114 (2004) 475
Anionic dicyanamide frameworks as possible components of multifunctional materialsJ.A. Schlueter1, 1, U. Geiser1 and J.L. Manson2
1 Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
2 Condensed Matter Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
The dicyanamide anion, [ N(CN) 2] - (hereafter abbreviated dca), has been shown to be a versatile building block for the assembly of coordination polymers which are components of molecular superconductors, magnets and conducting/magnetic hybrid materials. Significantly different anion topologies have been observed. We report the first study of the use of alkylammonium cations as templates for [ M(dca) 3] - ( M = Mn and Ni) anionic networks, including a novel three-dimensional anionic structure in the (Bu 3NH) 4[ Mn 3(dca) 10] salt. The molecular superconductors with the highest superconducting transition temperature, -(ET) 2[ Cu(dca) X] [ X = Cl, Br; ET, commonly abbreviated as BEDT-TTF, is bis(ethylenedithio)tetrathiafulvalene] contain chains of diamagnetic Cu(I) ions linked by dca anions. The successful introduction of magnetically active transition metals into the charge-compensating dca layer will also be discussed. Specifically, we have synthesized and characterized the (ET) 2[ Mn(dca) 3] salt that contain a novel triangular, spin frustrated, anion lattice separated by conducting layers of ET radical cations. Key words. BEDT-TTF salt, tetraalkylammonium salts, dicyanamide, x-ray crystal structure.
© EDP Sciences 2004