Abstract
An orthogonally arranged conjugate comprised of two rhodium(III) tetrakis-4-tolyporphyrins linked with an azobenzene moiety through a covalent Rh-C (aryl) bond has been facilely synthesized and characterized. Although photochemical isomerization of the azobenzene component was not observed, addition of trifluoroacetic acid (TFA) to the conjugate in a toluene solution causes significant colorimetric changes. UV-vis absorption, resonance light scattering (RLS), [Formula: see text]H-NMR and IM-MS spectra were employed to investigate the pH-dependent chromogenic behavior of the triad, which gives a new pathway for construction of pH-dependent assemblies of porphyrin-azobenzene complexes.
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