ROLE OF THE TRICHLOROSTANNYL LIGAND IN HOMOGENEOUS CATALYSIS. 4. CORRELATIONS S OF SOLUTION STRUCTURE WITH CATALYTIC ACTIVITY IN CIS-(PTCL2(L)(PR3))/ TIN CHLORIDE DIHYDRATE (SNCL2O) AND (PT2(μ-CL)2CL2(PR3)2)/ TIN DICHLORIDE DIHYDRATE