Specific Features of Cation-Induced Aggregation of Tetracrown-Substituted Aluminum(III) Phthalocyaninates.

The cation-induced dimerization of tetra-(15-crown-5)-substituted Al(III) phthalocyaninate with Na⁺, K⁺ and Rb⁺ salts in solution has been studied by ¹H NMR. It has been demonstrated that two types of supramolecular dimers coexist in solutions, which is consistent with the existence of both the monomeric and oxygen-bridged dimeric forms of the initial Al(III) complex. With the use of mass spectrometry (MALDI-TOF and HR-ESI), it has been shown that Al(III) monophthalocyaninate [(OH)AlR₄Pc] forms supramolecular dimers {[M₄(XAlR₄Pc)₂]⁴⁺(X⁻)₄}, whereas Al(III) μ-oxodiphthalocyaninate [(AlR₄Pc)₂(μ-O)] forms oxygen-bridged supramolecular dimers {[M₄(XAlR₄Pc)₂(μ-O)]²⁺(X⁻)₂}. [ABSTRACT FROM AUTHOR]