Final answer:
The exact emission wavelength of pyrene in cyclohexane is not provided but can be inferred to be in the UV range, as larger conjugated pi systems like pyrene absorb and emit at longer wavelengths.
Step-by-step explanation:
The approximate emission wavelength of a solution with high pyrene concentration in cyclohexane is not directly provided in the reference materials. However, we can understand the behavior of molecules like pyrene in solution by considering how conjugated pi systems behave. As pyrene has an extended conjugated pi system, we can expect its absorption and emission wavelengths to be in the ultraviolet (UV) range of the electromagnetic spectrum, typically longer than those of simpler conjugated molecules due to its larger size and more delocalized electrons.
Although precise emission wavelengths depend on various factors like concentration, solvent, and temperature, we can rely on the general principle that as conjugated systems like pyrene become larger, the HOMO-LUMO energy gap narrows, causing absorption and emission at longer wavelengths.
To determine the exact wavelength of emission for pyrene in cyclohexane, experimental data from a spectrophotometer or literature values specific to pyrene would be needed.