Centrosymmetric to noncentrosymmetric structural transformation of new quaternary selenides induced by isolated dimeric [Sn2Se4] units: from Ba8Ga2Sn7Se18to Ba10Ga2Sn9Se22

Li, Yanyan; Wang, Jinqiu; Liu, Peng-Fei; Lin, Hua; Chen, Ling; Wu, Li‐Ming

doi:10.1039/c6ra27253c

Cited by 9 publications

(1 citation statement)

References 53 publications

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“…For enhancing the molecular first hyperpolarizability, noncentrosymmetry , of the compounds is an essential prerequisite. However, most “push–pull”-type D−π–A chromophores are inherently centrosymmetric unless an element of dissymmetry is incorporated. , Alternatively, when incorporated in noncentrosymmetric media, such chromophores show second-order nonlinear bulk susceptibility . Thus, the centrosymmetric chromophores are also valuable NLO-phores, and it has led to the synthesis and understanding of the NLO behavior of several classes of centrosymmetric chromophores .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Nonlinear Optical Behavior of Thermally Stable Chromophores Based on 9,9-Dimethyl-9H-fluoren-2-amine: Improving Intrinsic Hyperpolarizability through Modulation of “Push–Pull”

et al. 2022

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Improvement in the first hyperpolarizability (β HRS ) as well as intrinsic hyperpolarizability (β int ) of chromophores based on 9,9-dimethyl-9H-fluoren-2-amine through modulation of the conjugation pathway is described. A series of six novel chromophores with "linear" conjugation showed significant enhancement of β HRS as well as β int compared to the counterparts lacking a "linear" conjugation but having an identical combination of donor, acceptor, and the intervening π-conjugated linker. The hyperpolarizability (β HRS as well as β int ) values of the new series measured using hyper-Rayleigh scattering exceeded the apparent limit set by the latter set of fluorene-based chromophores. The experimental results are analyzed and interpreted in the context of linear optical properties, singlecrystal X-ray analysis, electrochemistry, etc. and corroborated by theoretical studies. We find that modulation of the "push−pull" of the conjugation pathway in these donor−acceptor chromophores compares favourably with the corresponding changes in the optical gaps, transition dipole moments, and dipole moment difference between the ground and excited states.

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