University of PardubiceFaculty of Chemical Technology

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Two-photon absorption in multipodal push-pull molecules: Structural aspects

Authors: Bureš Filip | Klikar Milan | Fakis Mihalis

Year: 2018

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Two-photon absorption in multipodal push-pull molecules: Structural aspects	Push-pull molecules represent unique class of organic substances due to their peculiar and distinct properties dictated mainly by the extent of the intramolecular charge-transfer (ICT). Historically, -system end-capped with both electron releasing and withdrawing groups were of substantial interest due to their color. The modern interest is mainly stimulated by the discovery of lasers and observation of the first nonlinear optical (NLO) phenomena. Two-photon absorption (2PA) belongs to the third-order nonlinear optical effects utilized across optoelectronics, photonics and biology. The most widely used and utilized organic molecules for 2PA are push-pull chromophores with tripodal arrangement, especially those with centrifugal arrangement. Triphenylamine (TPA) represents typical central electron donating moiety in such molecules. TPA has been utilized in many 2PA systems for bioimaging, photodynamic therapy, 3D optical storage memories, frequency up-converted lasing and 2PA-induced chemical polymerizations. Despite its well-explored chemistry and applications, it is somewhat curious that much less attention has been devoted to investigate its fundamental structure-2PA activity relationships. Since 2015, we have started our research activity towards synthesis of model TPA-based push-pull molecules and investigation of their (non)linear optical properties. In this contribution, we will mainly focus on structural parameters such as: i) the number and electronic nature of the (peripheral) acceptors, ii) the composition and length of the used -system, iii) multipodal arrangement and iv) star shaped arrangement.	push-pull molecules; triphenylamine