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Download fileBulk Spontaneous Magnetization in the New Radical Cation Salt TM-TTF[Cr(NCS)4(isoquinoline)2] (TM-TTF = Tetramethyltetrathiafulvalene)
journal contribution
posted on 2003-10-11, 00:00 authored by M. Mas-Torrent, S. S. Turner, K. Wurst, J. Vidal-Gancedo, X. Ribas, J. Veciana, P. Day, C. RoviraA new organic−inorganic hybrid salt [TM-TTF][Cr(NCS)4(isoquinoline)2] (1) (TM-TTF = Tetramethyltetrathiafulvalene)
has been synthesized. Compound 1 crystallizes in the triclinic P1̄ space group with a = 8.269(1), b = 10.211(2),
and c = 11.176(2) Å, α = 89.244(9), β = 88.114(6), and γ = 74.277(7)°, V = 907.6(3) Å3, and Z = 1. The
crystal structure was resolved in the temperature range between 223 and 123 K, showing that changes in the
crystal structure at low temperature result in stronger interactions between anions and cations. The packing of 1
consists of mixed anion−cation layers in the bc plane containing S···S and π−π anion−cation interactions, the
layers being connected by very short S···S contacts between anions and cations. Magnetic measurements in a
small external field show bulk spontaneous magnetization with a Tc of 6.6 K consistent with the presence of weakly
coupled ferrimagnetic order in compound 1. The EPR measurements also demonstrate the interaction between the
d and π electrons and the presence of an internal magnetic field brought about by the magnetic ordering.