Experimental Spin Density in a Purely Organic Free Radical: Visualisation of the Ferromagnetic Exchange Pathway in p‐(Methylthio)phenyl Nitronyl Nitroxide, Nit(SMe)Ph

Polarisedneutrondiffractionstudies of the purely organic 2-(4-methylthiophenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, Nit(SMe)Ph, ferromagnet (Tc = 0.2 K) have enabled the distribution of the global spin density to be determined (see picture), and a pathway for the magnetic interaction as well as a possible mechanism are proposed. The experimental results are compared with those from DFT calculations.