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|Title:||Thermal degradation of transition metal carbonyl complexes. part iii. thermogravimetric and differential scanning calorimetric studies of triphenylphosphine pentacarbonyls of chromium, molybdenum and tungsten||Authors:||Andy Hor, T.S.
|Issue Date:||15-Jun-1988||Citation:||Andy Hor, T.S.,Chan, H.S.O.,Chiam, C.S.M.,Lim, K.H. (1988-06-15). Thermal degradation of transition metal carbonyl complexes. part iii. thermogravimetric and differential scanning calorimetric studies of triphenylphosphine pentacarbonyls of chromium, molybdenum and tungsten. Thermochimica Acta 128 (C) : 175-184. ScholarBank@NUS Repository.||Abstract:||Thermogravimetric and differential scanning calorimetric studies on M(CO)5(PPh3) (M = Cr,Mo,W) revealed a sequential decomposition process which commenced at ca. 150°C. The Cr complex breaks down with a concurrent liberation of one PPh3 and two CO ligands. The Mo complex, however, eliminates two CO ligands stepwise, followed by the cleavage of the Mo-PPh3 bond. Expulsion of the PPh3 ligand in the W complex is facile, and occurs prior to the simultaneous elimination of the five CO ligands. Complete elimination of the ligands occurs readily in the latter complex below ca. 350 °C, which is consistent with a recent microcalorimetric study in the literature. The degradation pattern is dependent on the electronic and steric factors of the metal and ligands. © 1988.||Source Title:||Thermochimica Acta||URI:||http://scholarbank.nus.edu.sg/handle/10635/95291||ISSN:||00406031|
|Appears in Collections:||Staff Publications|
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