Influence of metal dilution on the light-induced spin transition in two 1D chain compounds: [FexZn1-x(btzp)3](BF 4)2 and [FexZn1-x(endi)3](BF4)2 {btzp = 1,2-bis(tetrazol-1-yl)propane and endi = 1,2-bis(tetrazol-1-yl)ethane}

The thermal and light-induced spin transitions in [FexZn 1-x(btzp)3](BF4)2 and [Fe xZn1-x(endi)3](BF4)2 {btzp = 1,2-bis(tetrazol-1-yl)propane; endi = 1,2-bis(tetrazol-1-yl)ethane} chain compounds have been investigated by magnetic susceptibility, photomagnetism and diffuse reflectivity measurements. These compounds display a thermal spin transition and the Light-Induced Excited Spin State Trapping (LIESST) effect at low temperature. For each compound, the thermal spin transition temperature, T1/2, and the relaxation temperature of the photo-induced high-spin state, T(LIESST), have been systematically determined. A decrease in T1/2 induces an increase in T(LIESST). The results are discussed and compared with some other "metal-diluted" iron(II) spin crossover (SCO) complexes