Chromium, molybdenum and ruthenium complexes of chloranilic acid (H(2)CA) were investigated by the thermogravimetric (TG) technique. The TG plot of Cr(H(2)CA)(3) showed three decompositions in the temperature range 336-802 degrees K. On the other hand, the TG plot of MoO3(HCA) complex displayed successive weight losses in four steps covering the temperature range 350-1278 degrees K. The thermal decomposition of the cluster compound Ru-3(CO)(10)(mu-H)(HCA) occurred in three steps within the decomposition temperature range 302-764 degrees K. Calculation of the reaction order of decompositions of the three complexes revealed that they follow first-order kinetics. The thermodynamic parameters for the different decomposition steps of the complexes were also determined from their DTG plots.