Mixed μ -azido-Schiff-base cyclometallated Pd (II) complexes as a template for novel palladacycles bearing bridging carbodiimido, tetrazolato ligands, and tetrazole-thiolato linkers

Mixed μ-azido-Schiff-base palladacycles [Pd{C,N-κ2-(4-R)C6H3CH = N-C6H3-2,6-i-Pr2}(μ2-N3)]2 (R = H, 1; OMe, 2) served as a metal-template for the synthesis of unusual dicarbodiimido bridged complexes [(μ2-NCN-Xyl)Pd{C,N-κ2-(4-R)C6H3CH = NC6H3-2,6-i-Pr2}]2 (R = H; OMe) and mixed tetrazolato-isocyanido complexes [Pd(C,N-κ2-(4-R)C6H3CH = NC6H3-2,6-i-Pr2)(CN4-Xyl)(CN-Xyl)] (R = H; OMe). Reactions of ethyl isothiocyanate with 1 and 2 gave the ditetrazole-thiolato bridged Pd complexes [(μ2-SCN4-C2H5)Pd(C,N-κ2-(4-R)C6H3CH = NC6H3-2,6-i-Pr2)]2. All these complexes were fully characterized by FT-IR, NMR spectroscopy, elemental analysis and/or X-ray crystallography.