Sg. Telfer et al., Thermal spin crossover in binuclear Iron(II) helicates: Negative cooperativity and a mixed spin state in solution, INORG CHEM, 40(19), 2001, pp. 4818
Comparison of the thermal spin crossover transition in solution of a Fe(II)
dinuclear triple helicate with the analogous mononuclear complex shows tha
t the helicate transition takes place over a wider temperature range in a t
wo step process, implying negative cooperativity.