NC–(CF2)4–CNSSN˙ containing 1,2,3,5-dithiadiazolyl radical dimer exhibiting triplet excited states at low temperature and thermal hysteresis on melting–solidification: structural, spectroscopic, and magnetic characterization†
Abstract
A high yield, one-pot synthesis of the 1,2,3,5-dithiadiazolyl radical NC–(CF2)4–CNSSN˙ by Nδ−⋯Sδ+ interactions forming an infinite chain. Magnetic susceptibility measurements performed on the solid state sample indicate a magnetic moment of 1.8 μB per dimer (1.3 μB per monomer) at 300 K and a good fit to the Bleaney–Bowers model in the temperature range 2–300 K with 2J = −1500 ± 50 cm−1, g = 2.02(5), ρ = 0.90(3)%, and TIP = 1.25(4) × 10−3 emu mol−1. The [NC–(CF2)4–CNSSN˙]2 dimer is the second example of a 1,2,3,5-dithiadiazolyl radical dimer with an experimentally detected triplet excited state as probed by solid-state