Magnetization and heat capacity were measured down to 0.4 K ina 2:1 charge-transfer (CT) salt of a new donor molecule,ethylenedithiotetrathiafulvalenoquinone-1,3-dithiolemethide (
1) witha magnetic FeBr
4- ion (
12·FeBr
4). The Fe(III) d spins of FeBr
4-ions were subject to apparently ferromagnetic interaction with eachother through the interaction with the
![](/images/gifchars/pi.gif)
spins developed bylocalization of the conducting
![](/images/gifchars/pi.gif)
electrons on the donor columns,eventually giving rise to ferrimagnetic ordering (FI) near 1 K, whichprovides the first example in a molecular
![](/images/gifchars/pi.gif)
-d system.