Symmetric and Asymmetric Conjugated 3,3′-Bipyridine Derivatives as a New Class of Third-Order NLO Chromophores with an Enhanced Non-resonant, Nonlinear Refractive Index in the Picosecond Range

Abstract

We report on the synthesis and third‐order nonlinear optical (NLO) properties of new asymmetric (push–pull) and symmetric chromophores based on the 3,3′‐bipyridine core. The nonlinear refraction as well as the linear and nonlinear absorption of these compounds has been studied, in solution, by spectroscopy and picosecond single‐shot Z‐scan measurements. The results are very promising in terms of non‐resonant, nonlinear refractive index in the near infrared, particularly with enhancement of the (nonlinear efficiency/transparency) trade‐off afforded by the symmetrization of the chromophores. A new polymer with this structural design has also been investigated.

Ultrafast nonresonant third-order optical nonlinearity of a conjugated 3,3′-bipyridine derivative from 1150 to 1600 nm

“…The detailed comparison on the enhancement of optical nonlinearity of D-A-A-D structure with other molecular structures can be found in Ref. 11. The nonresonant n 2 values here are also significantly larger than those for some well-known nonlinear crystals, for example, (0.19-2.0)ϫ10 Ϫ6 cm 2 /GW of LiNbO 3 :MgO, KTA, KTP, BBO, and LBO.…”

“…11 It has been proved that reducing the ground-state aromatic character by incorporating a thiophene ring as the donor group in the -conjugated system on the one hand, and a symmetrical D-A-A-D -conjugated bridge on the other hand, enhance the nonresonant n 2 value. The detailed comparison on the enhancement of optical nonlinearity of D-A-A-D structure with other molecular structures can be found in Ref.…”

“…The strategy for designing molecules according to these requirements has been reported in Ref. 11, and a new synthetic route has been developed 12 by modifying the one reported in previous articles. 13 The molecule exhibits an apolar structure donor-acceptor-acceptor-donor ͑D-A-A-D͒, in which the 3,3Ј-bipyridine core acts as the acceptor group ͑A-A͒ and the donor group ͑D͒ is a thiophene ring.…”

Growth and characterization of Piperazinium adipate: A third order NLO single crystal

“…In transmission-based devices, the materials are required to have large nonlinear refractive indices accompanied by minimal absorption losses [4][5][6].…”

Supramolecular photocatalyst of Palladium (II) Encapsulated within Dendrimer on TiO2 nanoparticles for Photo‐induced Suzuki‐Miyaura and Sonogashira Cross‐Coupling reactions

“…It was observed that Pd (II) [PTATA G2‐NH 2 ] @ TiO 2 nanodendritic catalyst worked well for one pot triple coupling of cyanuric chloride and phenylboronic acid which leads to produce 1,3,5‐triazine derivatives (Table , entry19). The 1,3,5‐triazine derivatives as star‐shaped compounds have been used in liquid crystals, component of organic light‐emitting devices (OLEDs) coordination chemistry, and the syntheses of dendritic chromophores …”