Abstract
Abstract A free base tetracationic porphyrin (TMPyP) was adsorbed at a mica/aqueous solution interface. Atomic force microscopy (AFM) in liquid revealed that the porphyrin rings lie flat on the mica surface with their meso substituents partially rotated toward planarity. Optical waveguide spectroscopy elucidated a bathochromic shift of the Soret band, suggesting extension of π-conjugation by partial inclusion of pyridinium rings.
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