To further explore the REE and any potential connection to photochemical reactivity, a series of molecules were synthesised containing two trans-PyChal monomers tethered together by varying linker lengths, designated by the linker length, Dn, (Figure ), where linker lengths n = 2 to 4 were investigated -chemical structures of D2-4 are showed in Supporting Information Section S5. Here, the impact of these wavelength-dependent excited-state lifetimes and microenvironments on chemical reactivity were explored. We hypothesise that the tethered molecules would have little variation in wavelength-dependent reactivity from absorbance due to the relatively close proximity between trans-PyChal monomers, allowing for rapid intramolecular [2+2]-photocycloaddition even with short excited-state lifetimes.