| Numéro |
J. Phys. IV France
Volume 114, April 2004
|
|
|---|---|---|
| Page(s) | 475 - 479 | |
| DOI | https://doi.org/10.1051/jp4:2004114111 | |
J. Phys. IV France 114 (2004) 475
DOI: 10.1051/jp4:2004114111
Anionic dicyanamide frameworks as possible components of multifunctional materials
J.A. Schlueter1, 1, U. Geiser1 and J.L. Manson21 Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
2 Condensed Matter Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Abstract
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