Design, synthesis and optical properties of unsymmetrical subphthalocyanine trimer connected by phloroglucinol via axial positions.

An unsymmetrical subphthalocyanine trimer consisting of three different subphthalocyanine units was synthesized. Its optical and physical properties were investigated by UV/Vis, fluorescence spectrometry, cyclic voltammetry and computations. Energy transfer from the non-substituted subphthalocyanine unit to the perfluorinated subphthalocyanine unit via a trifluoroethoxy substituted unit is suggested.

Synthesis and optical properties of subphthalocyanine homo- and heterodimers axially connected via a hydroquinone linker.

Axially linked trifluoroethoxy (TFEO)-coated subphthalocyanine (SubPc) homo- and heterodimers were synthesized by two different axial ligand substitution methods. TFEO-SubPc homodimers were obtained directly from TFEO-SubPc boron chloride with o-, m-, and p-hydroquinones, while TFEO-SubPc heterodimers were synthesized via stepwise construction using a combination of the TFEO method and Torres' triflate method. The optical properties of the dimers obtained were investigated using UV-Vis and fluorescence spectrometry. Electron transfer was observed in the heterodimers, and TFEO-SubPc acted as an electron acceptor in the process. The electron transfer process differs depending on the o-, m-, and p-geometries of the hydroquinone linker, and is supported by computational calculations.