Fourier transform ion cyclotron resonance studies of lanthanide(III) porphyrin-phthalocyanine heteroleptic sandwich complexes by using electrospray ionization

摘要: A number of neutral Ianthanide(III) porphyrin-phthalocyanine heteroleptic sandwich complexes have been studied by using positive-ion electrospray ionization-Fourier transform ion cyclotron resonance mass spectrometry. The investigated compounds are represented as LnIII(TPP)(Pc), Ln2III(TPP)(Pc)2, and Ln2III(TPP)2(Pc), where Ln = Sm, Eu, or Gd, TPP is 5,10,15,20-tetraphenylporphyrinate, Pc phthalocyaninate. In all cases, intense signals corresponding to the singly charged molecular radical cations observed. formation these in ionization attributed electrochemical oxidation at needle. Multiply ions up +5 also They tentatively assigned be formed from successive ligand(s). Apart weight information, tandem spectrometry offers additional structural information on complexes. From fragmentation pattern europium under collision-induced dissociation conditions, configurations triple-decker spectrometrically (TPP)Eu(Pc)Eu(Pc) (TPP)Eu(Pc)Eu(TPP). comparison with previous spectroscopic findings that positive “hole” localized ligands complexes, there evidence suggest intramolecular charge transfer hole delocalization does occur within macrocycles between metal centers before fragmentation. occurrence this charge-transfer process result collisional activation.