Influence of Metal Dilution on the Light-Induced Spin Transition in Two 1D Chain Compounds: [Fe_xZn_1-x(btzp)₃](BF₄)₂and [Fe_xZn_1-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 [FexZn1-x(btzp)(3)](BF4)(2) and [FexZn1-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, T-1/2, 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. ((C) Wiley-VCH Verlag GmbH & Co, KGaA, 69451 Weinheim, Germany, 2008)