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• W2079233861 abstract "Abstract Two‐photon absorption (TPA) properties of a laterally nonsymmetric aza cryptand with attached side arms have been investigated. This series of Schiff base derivatives supports the mechanistic approach for enhancing the TPA process, which is usually dictated by molecular geometry, π‐bridging, delocalization length, and corresponding charge‐transfer possibilities. The results described here suggest that on increasing the branching units, the TPA cross‐section, σ (2) , can be tuned to a larger value. The TPA activity is “switched on” when a metal atom enters the cavity and serves as a conduit of electronic delocalization. The σ (2) value increases as the donor strength increases. The maximum value is obtained on moving from the single‐branched system to the nearly threefold symmetry. This serves as a useful synthetic strategy for designing novel octupolar molecules with high σ (2) values. Theoretical calculations at the B3LYP functional with the 6–31G* basis set under DFT formalism provide supporting evidence that the communication between the side arms through the metal d orbital and more ordered geometry of chromophores leads to a smaller HOMO–LUMO gap, which has a great influence upon the electronic properties of the molecules." @default.
• W2079233861 created "2016-06-24" @default.
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• W2079233861 date "2008-11-21" @default.
• W2079233861 modified "2023-10-18" @default.
• W2079233861 title "Attachment of Different Donor Groups to a Cryptand for Modulation of Two-Photon Absorption Cross-Section" @default.
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• W2079233861 doi "https://doi.org/10.1002/chem.200801396" @default.
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