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Multichromophoric Calix[4]arenes: Effect of Interchromophore Distances on Linear and Nonlinear Optical Properties
Authors:Dr Raquel Andreu  Dr Santiago Franco  Prof Javier Garín  Judith Romero  Dr Belén Villacampa  Dr María Jesús Blesa  Dr Jesús Orduna
Institution:1. Departamento de Química Orgánica, ICMA, Universidad de Zaragoza‐CSIC, 50009, Zaragoza (Spain), Fax: (+34)?976?761?194;2. Departamento de Física de la Materia Condensada, ICMA, Universidad de Zaragoza‐CSIC, 50009, Zaragoza (Spain)
Abstract:Multichromophoric calix4]arenes with two or four disperse red one (DR1) moieties linked to the lower rim have been synthesized. The second‐order nonlinear optical activity was measured by using the electric‐field‐induced second‐harmonic generation technique and there was a nearly linear increase of the μβ value with the number of chromophores in the molecule without affecting the charge‐transfer absorption wavelength. The effect that the number of DR1 units plays on the hyperpolarizability, the dipole moment, and the absorption maxima has been also studied by using quantum chemical calculations. It was found that it was necessary to synthesize multichromophores with distant chromophores to obtain large nonlinear optical responses.
Keywords:calixarenes  chromophores  nonlinear optics  quantum chemistry  transparency–  efficiency tradeoff
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