Abstract:The thermal and light-induced magnetic properties of a family of metal-diluted spin-crossover complexes, [Fe x M 1-x -(phen) 2 (NCS) 2 ] (phen = 1,10-phenantholine and M = Ni II , Cd II ), are reported and compared to previous results obtained for the same series but with Zn II ions used to substitute Fe II ions; the ultimate goal was to validate the influence of the size and nature of the inert metal ion on the light-induced properties of spin-crossover compounds. For all of the materials, we measured the thermally induced spin-crossover temperature (T 1/2 )
Light Induced Excited Spin State Trapping (LIESST) is a well known phenomenon in spin crossover (SCO) materials, studied since 1982 in solution and 1984 in the solid state, as it offers some interesting pro spects in data storage. In this paper we discuss the influence of metal dilution on the lifetime of the photo induced state in two 1D chain solid solution series: [Fe x Zn 1 x (btzp) 3 ](BF 4) 2 and [Fe x Zn 1 x (endi) 3 ] (BF 4) 2 {btzp 1,2 bis(tetrazol 1 yl)propane and endi 1,2 bis(tetrazol 1 yl)ethane}. For each composi tion, we have determined the thermal spin transition temperature, T 1/2 , and the relaxation temperature of the photoinduced high spin state, T(LIESST). A detailed analysis of the relaxation kinetics allowed a dis cussion of the evolution of this lifetime as a function of metal dilution.
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