Iron(III) spin-crossover complexes [Fe(pap)2]ClO 4·H2O (1), [Fe(pap)2]BF 4·H2O (2), [Fe(pap)2]PF 6·CH3OH (3), [Fe(CH3-pap) 2]ClO4·H2O (4), [Fe0.5Al 0.5(pap)2]ClO4·CH3OH (5) and [Fe0.25Al0.75(pap)2] ClO4· CH3OH (6) were prepared and the spin transition behaviors of the complexes have been studied from magnetic susceptibility and Mössbauer spectroscopy measurements. The magnetic properties of light-induced metastable state are measured using Hg-Xe light source. T1/2 is temperature at which the populations of the high-spin and low-spin species are fifty-fifty. Metastable HS is produced by light irradiation at 5 K. T(LIESST) is the temperature at which the populations of the metastable high-spin species decrease to one half and cooperativity factor C is defined as the parameter which presents the strength of cooperativity. The value of T(LIESST) decreases as T1/2 increases and the plots of T(LIESST) vs. C show linear correlation. The effect of cooperativity of the complexes on the relaxations in solid was confirmed for the iron(III) complexes.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Nuclear Energy and Engineering
- Radiology Nuclear Medicine and imaging
- Public Health, Environmental and Occupational Health
- Health, Toxicology and Mutagenesis