The iridium compound has parts that move around quickly at room temperature, with pyridine molecules leaving at about 8 times per second and hydrogen atoms swapping positions about 3.6 times per second.
Scientific Claim
The iridium complex IrCl(H)2(COE)(py)2 demonstrates dynamic ligand exchange behavior, with pyridine dissociation occurring at a rate of 7.8 ± 0.1 s⁻¹ at 298 K, and hydride site exchange at 3.6 ± 0.1 s⁻¹.
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The study reports measured rates of exchange processes, which is appropriate for describing observed associations between the complex and its dynamic behavior.
More Accurate Statement
“The iridium complex IrCl(H)2(COE)(py)2 is associated with pyridine dissociation at a rate of 7.8 ± 0.1 s⁻¹ at 298 K, and hydride site exchange at 3.6 ± 0.1 s⁻¹.”
Source Excerpt
“The rate of py loss for the equatorial site was determined to be 7.8 ± 0.1 s–1 at 298 K, and hydride site exchange into free H2 proved to be limited at this temperature. In contrast, the two distinct hydride sites of 2 proved to interchange positions at a rate of 3.6 ± 0.1 s–1, while the CH proton sites of COE interconvert at a rate of 3.8 ± 0.1 s–1.”
Evidence from Studies
Supporting Evidence (1)
The study provides specific rate measurements for ligand exchange processes using NMR techniques. The source excerpt directly reports the measured rates for pyridine loss, hydride exchange, and COE proton interconversion.