Photoinduced magnetization in molecule-based magnets KxCo[Fe(CN)(6)](y)center dot zH(2)O (x approximate to 0.31, y approximate to 0.77, z approximateto 3.54) and Mn(TCNE)(x)center dot y(CH2Cl2) (x approximate to 2)

Studies of photoinduced magnetization (PIM) in two molecule-based magnets, Prussian blue analog KxCo[Fe(CN)(6)](y). zH(2)O (x approximate to 0.31, y a pproximate to 0.77, z approximate to 3.54) and Mn(tetracyanoethylene)(x).y( CH2Cl2) (x approximate to 2), are presented. Detailed analysis of the de ma gnetization and ac susceptibility of Co-Fe Prussian blue shows that the mat erial is in a cluster glass stale, with strong indications of cooperative f reezing of the spin clusters. The PIM effects in the material are described within our model of photoinduced spin-doping of a cluster glass. High-T-c magnet Mn(tetracyanoethylene)(x).y(CH2Cl2) (T-c = 75 K) shows a substantial increase in magnetic susceptibility upon illumination with blue light. The re are indications that physical mechanism responsible for this effect is d ifferent from the one in Prussian blue analogs. The effect is reversible an d the material returns to the state before illumination after hearing to si milar to 250 K. (C) 2001 Elsevier Science Ltd. All rights reserved.