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Synthesis and Spectroscopic Characterization of a Novel Coordination Polymer of Palladium(II) with Pyrazole and Azido Ligands

The one-dimensional coordination polymer of palladium(II) with pyrazolato (Pz − ) and azide (N 3 − ) as bridging ligands, of formula [Pd 3 (µ-N 3 )(µ-Pz) 5 ] n , has been prepared. From IR and Raman studies it was evidenced the exobidentate nature of pyrazole ligands as well the µ-1, 1-bridging coordination of azido groups. NMR experiments showed two sets of broadened signals with different intensities indicating the presence of pyrazolato groups in distinct chemical environments. The proposed structure of [Pd 3 (µ-N 3 )(µ-Pz) 5 ] n consisting of a zigzag ribbon in which each (Pz) 2 Pd(Pz) 2 entity is bound to two stacked planar units [Pd(µ-Pz)(µ-N 3 )Pd core] with very weak Pd-Pd interaction, based on UV-Vis spectroscopy.