The Solid-state Isomerization of cis and trans-(η5 -C5H4Me)Mo(CO)2(P(Oi Pr)3)I
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Date
2002-06-16
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Abstract
The cis- and trans-(η5
-C5H4Me)Mo(CO)2(P(Oi
Pr)3)I complexes undergo a bi-directional thermal ligand isomerization
reaction to yield an equilibrium mixture of isomers (30/70 cis/trans ratio, 90 °C, < 80 min) in the solid state. The activation
energy barrier for the cis-trans isomerization reaction (80–100 °C) was found to be 68 ± 10 kJ mol–1. In benzene (reflux, 2 h)
this isomer ratio was found to be 70:30 cis/trans. DSC and powder XRD studies have revealed reactions that occur in the solid
state entailing decomposition and isomerization. DSC experiments did not reveal the presence of the cis–trans isomerization
reaction.
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Isomerization/ solid state / XRD powder diffraction / molybdenum