FERROMAGNETIC BEHAVIOR OF A TETRAFLUOROTETRACYANOQUINODIMETHANIDE SALT AT ROOM-TEMPERATURE

Recrystallization of N(CH3)(4)(+). TCNQF(4)(-.) in the presence of TCN QF(4) from acetonitrile/ether gave a crystal of {N(CH3)(4)(+). TCNQF(4 )(-.)}. 1/2(TCNQF(4)), which very interestingly exhibited ferromagneti sm at room temperature. This organic ferromagnet has characteristics o f very small saturation moment (1.03 x 10(-3) mu(B)/molecule) and coer cive field (approximate to 25 Oe). The origin of this ferromagnetism c ould be attributed to a unique crystal structure of the radical anion salt: the TCNQF(4)/TCNQF(4)(-.) and N(CH3)(4)(+) ion layers are altern ately stacked and in the TCNQF(4)/TCNQF(4)(-.) layer each pair of two TCNQF(4)(-.) molecules is arranged in a completely perpendicular manne r to each of one TCNQF(4) molecule.