Synthesis of the First Azomethine Derivatives of Pd(II) Coproporphyrins I and II

Abstract

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

Palladium Complexes of Azomethine Derivatives of Porphyrins as Potential Photosensitizers

“…Azomethine derivatives of palladium complexes of coproporphyrin I were obtained as previously reported. [18,19] Palladium complexes of azomethine derivatives of mesoporphyrin IX were synthesized for the first time via similar procedure. Carboxyl groups were protected by transformation into ethyl esters to avoid complications during functionalization reactions.…”

“…Palladium complexes of azomethine derivatives of coproporphyrin I 3-6 were prepared according to previously published procedures. [18,19] All reactions were performed under protection from direct light under argon and monitored using electronic absorption spectroscopy and by TLC Macherey-Nagel Alugram SIL G/UV254 silica gel 60 UV254. Silica gel 40/60 (Merck) was used for column and flash chromatography.…”

“…The earlier developed procedure of the synthesis of Schiff bases of coproporphyrins I and II [18] was used to obtain chlorophyll a derivative trimethyl ester of mesochlorin e 6 (Figure 2). Unlike the porphyrins electrophilic substitution reactions with chlorins were carried out under argon atmosphere because otherwise side reactions were observed, and the yield of the target product did not exceed 20 %.…”

Synthesis and Study of New N-Substituted Hydrazones of Ni(II) Complexes of β-Octaethylporphyrin and Coproporphyrin I Tetraethyl Ester

“…Earlier, we obtained azomethine derivatives of palladium complexes of β-octaethylporphyrin and coproporphyrin I, [11][12][13] as well as ruthenium complexes of coproporphy- of tetramethylsilane. Coupling constants are given in Hz.…”

Accuracy of Determination of Self-Diffusion Coefficients in Studies of Porphyrin-Based Complexes by 2D DOSY

“…[12][13][14][15] Modern NMR methods play a special role in studied of formation of intermolecular complexes and associates, [16][17][18] and in identifying supramolecular assemblies. [19][20][21][22][23][24] In studies of intermolecular interactions in porphyrin complexes, a number of efficient approaches can be applied, including classical analysis of chemical shifts and relaxation times and modern two-dimensional methods such as nuclear Overhauser effect [25][26][27] and diffusion-ordered spectroscopy (DOSY). [11,13,[28][29][30][31][32][33][34] Each of them has its own strong and weak sides.…”