The photochemical substitution of [W(CO)₅(py)] (py = pyridine) with triphenylphosphine gives [W(CO)₅(P(C₆H₅)₃)]. In the presence of excess phosphine, the quantum yield is approximately 0.4. A flash photolysis study reveals a spectrum that can be assigned to the intermediate [W(CO)₅]. What product and quantum yield do you predict for substitution of [W(CO)₅(py)] in the presence of excess triethylamine? Is this reaction expected to be initiated from the ligand field or MLCT excited state of the complex?