The absorption spectrum of 3 in dichloromethane was characteristically similar to that of the parent pyrene with a modest bathochromic shift (∼30 nm) owing to the alkyl substitutions. Furthermore, unlike the parent pyrene 9 which showed a broad featureless excimer emission centered at ∼472 nm in the concentration range studied (0.05–0.1 M), the tetraisopropylpyrene 3 showed only the monomeric emission (Fig. 1). As such, the observation of monomeric ...
