Single-molecule photophysical properties of various directly linked porphyrin arrays

Over the past decades, multiporphyrin arrays have been envisaged and prepared using several types of shorter linkers that are suitable for preparing linear or extended architectures via a meso position attachment. Various synthetic strategies involve the exploitation of a wide range of linkage motifs, such as butadiyne, biphenyl, ethene, ethyne, enyne, furan, hexatriene, naphthalene, phenanthrene, phenylethene, and p-phenylene [1-15]. Although there exist opulent molecular architectures due to various linkers to adjoin the porphyrin moieties together, the requirements for ample electronic interactions between neighboring porphyrin pigments for e?cient excitation energy transfer (EET) and well-de?ned and rigid molecular structures to be void of any energy or charge sink should be considered. In this context, porphyrin arrays where constituent porphyrins are connected directly without any links can be promising molecular architectures for the application in molecular photonics and electronics.