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A dipyrazol-bridged macrocyclic palladium(Ⅱ) complex [{Pd(en)}4L4](NO3)8 (en=ethylenediamine, L=3,3',5,5'-tetramethyldipyrazol) 1 was prepared in water through a [4+4] macrocyclization of cis-(ethylenediamine)Pd(l)nitrate and the neutral form of t