Abstract
A family of three new mononuclear complexes of the general form [Fe(L-pz)(2)(NCE)(2)] has been prepared (L-pz = 4-p-tolyl- 3-(2-pyrazinyl)5-(2-pyridyl)- 1,2,4- triazole; E = S, Se, BH3). All three exhibit spin crossover, in two cases with hysteresis, with T-1/2 being predictably tuned by varying the coordinated anion.