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The p-π conjugated nature of tetra(naphthalene-dione)porphyrins and tetra(naphthalene-dithione)porphyrins is clarified by DFT studies by Dongdong Qi and Jianzhuang Jiang on page 2605. The conjugated model changes from the uniform benzene-type form to the butadiene-type with a strong–weak alternating π bonding nature, due to the interaction between the peripheral carbonyl or thionyl substituents and the tetra(naphthalene)porphyrin skeleton. Because of the p-π conjugation, the unidirectional photon-induced current in this kind of molecular skeleton (with a highest efficiency of about 90% in the range of 300–800 nm) renders these compounds ideal dyes with potential application in panchromatic dye-sensitized solar cell materials.