Temperature dependence of spectroscopic properties of isolated polydiacetylene chains strained by their monomer single crystal matrix

Exciton Diffusion in Highly-Ordered One Dimensional Conjugated Polymers: Effects of Back-Bone Torsion, Electronic Symmetry, Phonons and Annihilation

“…Finally, the low temperature absorption line width of crystals studied here is similar to that reported for isolated chains in previous studies ( SI Section S1 ), this again suggests that interchain interactions are not significant. 51 These observations further corroborate the claim that defect states generally play little role in our observations here. Performing fs-TAM measurements on thicker PDA crystals which have a lower Urbach energy 31 (30 meV versus 34 meV) shows that the diffusion coefficient and dynamics remain qualitatively unchanged ( SI Section S4 ).…”

Optical Projection and Spatial Separation of Spin-Entangled Triplet Pairs from the S1 (21 Ag–) State of Pi-Conjugated Systems

“…''mirror image'' between absorption and emission spectra as well as high electron mobility also suggests singlet-polaron formation to be disfavored. 89 Furthermore, in pump-probe measurements, SE from the zero-phonon band does not spectrally shift (within our resolution of $1.2 nm) following photoexcitation (Figure S4). Further supporting the idea that there is very little change in the lattice between ground and excited state in PDA, with singlet-polaron formation generally disfavored.…”

Structural study of two reactive diacetylenes

“…This allows study of electronic properties of PDA in usually inaccessible conformations, see [25]. Indeed, the exciton energy and vibrational frequencies of these chains vary with T in an uncommon way.…”

“…To obtain the 3 BCMU crystallographic structure in its two phases at 110 K and 270 K, different methods have been used, X-rays diffraction at 110 K, neutron diffraction at 270 K helped by a calculated geometrical optimisation. Using these structure, two problems are addressed in the following two companion papers: photopolymerization in [24] and the effect of strain on the spectroscopic properties of isolated chains in [25].…”