Strong Cooperative Enhancement of Two-Photon Absorption in Dendrimers

• DOI: 10.1021/jp034986l
• Publication Date: 2003-07-31T05:39:40Z
• Authors: Mikhail Drobizhev; Aliaksandr Karotki; Yuliya Dzenis; Aleksander Rebane; Zhiyong Suo; Charles W. Spangler
• Keywords: 01 natural sciences; 0104 chemical sciences

We present, for the first time, unambiguous spectroscopic evidence of strong cooperative enhancement of two-photon absorption (TPA) in a series of dendritic macromolecules. The maximum TPA cross section increases in proportion to N2, where N = 2, 4, 6 is the number of constituent identical chromophore units. We show that the enhancement is facilitated by the quasi-planar structure, which allows direct interbranch conjugation throughout the molecule.