Abstract
Photo-irradiation of the cis-[Pd(L1-4-κS,O)2] complexes with visible light leads to formation of trans-[Pd(L1-4-κS,O)2] isomers in acetonitrile, as determined by reverse-phase HPLC (RP-HPLC). In the absence of light, the trans-[Pd(L1-4-κS,O)2] isomers spontaneously revert to cis-[Pd(L1-4-κS,O)2]. The trans-[Pd(L1-4-κS,O)2] → cis-[Pd(L1-4-κS,O)2] reversion was found to be catalyzed by the presence of free HL ligands, and results in the formation of mixed-ligand complexes of the type cis-[Pd(L1-κS,O)(L2-κS,O)] as confirmed by RP-HPLC with ESI-MS detection. The mixed-ligand cis-[Pd(L1-κS,O)(L2-κS,O)] complex also undergoes photo-induced isomerism to form trans-[Pd(L1-κS,O)(L2-κS,O)] isomers in solution with visible light irradiation.
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