Abstract
A series of spin transition complexes[Fe1-xZnx(dpp)2(NCS)2]py (x = 0.05,0.10, 0.15. 0.20, 0.25, and 0.40; py=pyridine) has been synthesized andstudied by Mössbauer spectroscopy. The high-spin structure is frozen atroom temperature, and the induced meta-stable high-spin phase by theso-called rapid cooling method is monitored by temperature and time-dependent Mössbauer spectra. The investigation on dynamic relaxation ofthe high-spin state to the low-spin state at 80 K reveals sigmoidbehaviour and existence of cooperative effect for low dilutedcomplexes. This cooperative effect is wrecked by the dilution ofZn(II) ions in Fe(II) ion sites, and relaxation curves graduallybecome to obey the first-order kinetics as the ratio of the dilutionincreases.
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