The effective synthesis of Pd(II) monofunctional azomethine derivatives of coproporphyrin isomers I and II is reported. The proposed method is based on the interaction of a "phosphorus complex", generated in situ by

The features of porphyrins defining their functionality are related to their conformational flexibility. The degree of nonplanarity of metalloporphyrins depends directly on the number of substituents, their size and their location. The introduction of substituents in the meso positions of β-substituted porphyrins increases the steric interaction and leads to distortions of the porphyrin core. Increasing the distortion of the porphyrin core would augment the bathochromic (red) shift of the electronic absorption spectra. A new nonsymmetrical 2,3,7,8,12,13,17,18-octaethyl-5-[(methylimino)methyl]porphyrin complex of palladium(II), [Pd(CHN)], was synthesized and characterized by NMR, mass spectrometry and X-ray analysis. The features of the electronic absorption spectrum of the synthesized complex are explained by the planarity of the porphyrin core and the π-system of the imino group orthogonal to it.

Various isomers of azomethine derivatives of mesoporphyrin IX were first obtained in the form of palladium complexes by the interaction of the so-called "phosphorus complex", produced in situ in the Vilsmeier

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