Abstract
The specifically solvated five-coordinate intermediate [(triphenylphosphine)-tetracarbonyltungsten(O)] was produced via pulsed laser flash photolysis from cis-(piperi-dine)(triphenylphosphine)tetracarbonyltungsten(O) in chlorobenzene. This five-coordinate species was identified through comparison of the “competition ratio” k 2/ k −1, for its interaction with piperidine (governed by k −1) and tri(isopropyl) phosphite (governed by k 2) as determined through parallel flash photometric and thermal studies. This method offers a broadly applicable means of identification of transients generated upon flash photolysis and of obtaining values of all rate constants for ligand-displacement reactions of substituted octahedral metal carbonyls by Lewis bases.
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