how could you estimate the relative ordering of the electron -donor of the power PR3 Ligands?

how could you estimate the relative ordering of the electron -donor of the power PR3 Ligands?,when provided with sets of different ligands of the PR3 type and a large supply of (CO)5W(thf) with which to make a series of complexes of the form(CO)5(PR3)(by substitution of thf with PR3).
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