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Thermal decomposition of[R_4N][FeCo_3(CO)_(12)][I](R=ethyl,butyl,hexadecyl,benzyltrimethyl,benzyltriethyl)in n-heptane,toluene and methanol was investigated bythe in situ high pressure IR spectroscopic method.The results show that underhydroformylation conditions all clusters decompose to Co_2(CO)_8,Fe(CO)_5 and the salt ofCo(CO)_4~-,and Co_2(CO)_8 reacts with H_2 to form HCo(CO)_4.Thermal stability of theclusters decrease with the increase of polarity of solvents.Under the hydroformylation con-ditions,IR spectra of the clusters are compatible with those of Fe(CO)_5+Co_2(CO)_8+[R_4N]Cl system.Because of the stabilizing effect or tetra-alkylammonium cation,when the tem-perature drops below 50℃ after decomposition of the clusters,the characteristic absorptionbands of the clusters appear again,so the decomposition process is reversible.
The thermal decomposition of [R_4N] [FeCo_3 (CO) _ (12)] [I] (R = ethyl, butyl, hexadecyl, benzyltrimethyl, benzyltriethyl) in n-heptane, toluene and methanol was investigated by in situ high pressure IR spectroscopic method The results show that underhydroformylation conditions all clusters decompose to Co_2 (CO) _8, Fe (CO) _5 and the salt of Co (CO) _4 ~ -, and Co_2 (CO) _8 reacts with H_2 to form HCo (CO) _4. Thermal stability of the clusters decrease with the increase of polarity of solvents. Under the hydroformylation conditions, IR spectra of the clusters are compatible with those of Fe (CO) _5 + Co_2 (CO) _8 + [R_4N] Cl system.Because of the stabilizing effect or tetra-alkylammonium cation, when the tem-perature drops below 50 ° C after decomposition of the clusters, the characteristic absorption bands of the clusters appear again, so the decomposition process is reversible.