Magnetic behavior of tetrakis[4-(N-tert-butyl-N-oxylamino)pyridine]bis(isocyanato-N)cobalt(ii) in frozen solutionElectronic supplementary information (ESI) available: UV?Vis spectra change (S1),?T vs. T plots (S2) of microcrystalline state and frozen solution samples, ?? vs. ?? plot (Cole?Cole diagram) (S3), Mmol/N�B vs. H/T plots (S4) for Co(OCN)2�(4NOPy)4 in frozen solution and ??T and ?? vs. T plots (S5) for Co(SCN)2�(4NOPy)4 in frozen solution. See http://www.rsc.org/suppdata/cc/b4/b403524k/