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2,2′‐Bipyridine‐Based Dendritic Structured Compounds for Second Harmonic Generation
Author(s) -
Büchert Marina,
Steenbock Torben,
Lukaschek Christian,
Wolff Marie C.,
Herrmann Carmen,
Heck Jürgen
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404001
Subject(s) - hyperpolarizability , chromophore , second harmonic generation , nonlinear optical , covalent bond , bipyridine , dipole , acceptor , density functional theory , chemistry , materials science , electron donor , photochemistry , crystallography , computational chemistry , nonlinear system , physics , optics , organic chemistry , condensed matter physics , catalysis , crystal structure , quantum mechanics , laser
Parallel alignment of dipolar electron‐donor–π‐bridge‐electron‐acceptor entities can strongly enhance their nonlinear optical properties. This favorable arrangement can be in principle achieved by linking these units covalently or through metal coordination. Four dipolar single‐strand chromophores decorated with a 5‐electron‐donor–5′‐electron‐acceptor‐modified 2,2′‐bipyridine functionality were synthesized. For two of these chromophores triple‐stranded dendritic structures were successfully formed. All of the compounds were characterized with respect to their linear and nonlinear optical properties. For the aldehyde derivatives an enhancement of the first hyperpolarizability of 4.5 rather than 3 was obtained when going from single to triple strands. Theoretical calculations with density functional theory suggest that interstrand transitions contribute to the optical properties of the dendritic structures.