Spectroscopic properties of hydrogen-bond-modulated porphyrin dimer in different polar solvents

The spectroscopic properties of hydrogen-bond modulated cofacial porphyrin dimers in different polar solvents are reported. UV–Vis absorption, fluorescence and fluorescence lifetime measurements provide information regarding the exciton interaction of the cofacial porphyrin dimers in different polar solvents. The results indicate that the absorptions of the Soret band of the cofacial dimer can be slightly turned by changing the polarities of solvents. The strong intramolecular hydrogen bonds play an important role to enforce the adoption of the H-aggregation mode, and then finely turn the spectral properties with different polar solvents.