Hydrogenated pyrenes, structures

As mentioned in the introduction section, the photoluminescent properties of molecular assemblies depend on the assembled structures of photoluminescent moieties [11, 21-34]. If assembled structures of photoluminescent moieties are changed by external stimuli, stimuli-responsive photoluminescent materials can be prepared. Recently, we have reported on anthracene, pyrene and naphthalene derivatives 1-3 having dendritic moieties which contain amide moieties to form intermolecular hydrogen bonds (Fig. 2) [28-30]. These dendritic moieties are known to be... 

The carbon-to-hydrogen ratios are benzene = 1 naphthalene = 1.25 anthracene = 1.40 pyrene = 1.60. The percentage of carbon in a structure increases with the number of fused aromatic rings. 

Benzo(a)pyrene (Figure 1.14) is the most studied of the polycyclic aromatic hydrocarbons (PAHs), which are characterized by condensed ring systems ( chicken wire structures). These compounds are formed by the incomplete combustion of other hydrocarbons, a process that consumes hydrogen in preference to carbon. The carbon residue is left in the thermodynamically favored condensed aromatic ring system of the PAH compounds. 

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