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Additional info for A Kinetic Hypothesis to Explain the Function of Electrons in the Chemical Combination of Atoms(en)(5

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12 Molecular structure of the chromophoric unit in the dendrimer investigated by Adronov et al. [125]. X is the attachment point to the dendrimer In the second case, the branching point of the dendrimers is usually a tertiary amine, which also serves as a donor group for 2PA dyes belonging to class I of Fig. 8. Drobizhev et al. investigated dendrimers based on this scheme and having stilbene or distyrylbenzene moieties as the conjugated groups between branching points [126–128]. 2–4, see Table 7) [127].

Max (GM) (2) λmax (nm) 44 M. Rumi et al. Two-Photon Absorbing Materials and Two-Photon-Induced Chemistry 45 from R2 to R3 [119]. 2 series, but a different type of branch that includes ethynylene instead of vinylene units and is longer overall. Two peaks are observed in the 2PA spectra [120]. 2 × 102 GM, the other is observed at 780 nm, in a region where the one-photon absorption spectrum does not have distinct features, and has comparable cross section. 2, it can be observed that conjugated linkers containing triple bonds are less effective than those containing double bonds in enhancing 2PA properties, as also discussed above for quadrupolar chromophores (Sect.

Max (GM) Molecule λ(2) max (nm) Table 5 2PA properties of dipolar molecules as a function of donor/acceptor strengths. The solvent in which the measurement was performed is indicated in parenthesis after the molecular structure. 5 from Table 4 are repeated here to facilitate comparisons Two-Photon Absorbing Materials and Two-Photon-Induced Chemistry 39 40 M. Rumi et al. 4 Octupolar and Other Multibranched Dyes Octupolar chromophores can offer an alternative design strategy for 2PA materials, and various structures belonging to this general category have been investigated.

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