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Aromatic region of stacked 1H NMR spectra (CD3CN/CD2Cl2 1:1) of i) Pd2(stable Z-1)4; ii) Pd2(stable E-1)4 generated by irradiation of Pd2(stable Z-1)4 at 312 nm; iii) Pd2(stable E-1)4 prepared directly from ligand stable E-1; iv) Pd2(unstable Z-1)4 generated by irradiation of Pd2(stable E-1)4 at 312 nm and v) Pd2(stable E-1)4 generated by irradiation of Pd2(unstable Z-1)4 at 365 nm.
