Synthesis of distinct tetra palladium(II) complex of pyrrole-based ligand

A simple pyrrole-based Schiff base ligand, 2-[(2-pyrrolylmethylene)amino]phenol was used to synthesize a unique tetra palladium(II) complex by treating it with PdCl 2 in CH 3 OH/CH 3 CN for 1 h at room temperature. X-ray structure showed that each Pd(II) ion adopted a distorted square pyramidal structure and bonded to pyrrole “N”, imine “N”, two phenolate “O”s, and one Pd(II) ion with direct Pd(II)-Pd(II) bond. Three ligands are involved in completing the square pyramidal geometry of each Pd(II) ion and the structure appeared as a hashtag symbol and four Pd(II) ions formed a plus symbol within the hashtag structure. The tetra palladium (II) complex showed a very simple NMR spectrum and absorbs strongly in the UV-visible region.