Synthesis of porphyrin(2.1.2.1) Pd(II) complexes embedded with various π units and their singlet oxygen generation capacity.

Novel porphyrin(2.1.2.1) Pd(II) complexes with various aromatic π rings (benzo, naphthalene and thiophene) embedded between dipyrrin units have been synthesized. Their molecular structures and optical and electronic properties were confirmed and fully investigated. These Pd(II) complexes showed moderate to good capacity of singlet oxygen generation under light irradiation.