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Updated: Jun 23, 2026

High Resolution Physical Characterization of Single Metallic Nanoparticles
Published on: June 28, 2019
Fine-tuning polyoxometalate non-linear optical chromophores: a molecular electronic "Goldilocks" effect
Ahmed Al-Yasari1, Philip Spence2, Hani El Moll2
1School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK. John.Fielden@uea.ac.uk and College of Pharmacy, University of Kerbala, Kerbala, Iraq.
Abstract:
A new aryl-imido polyoxometalate non-linear optical chromophore (POMophore) with a diphenylamino donor group attains the highest βzzz, 0 value (196 × 10-30 esu by Hyper-Rayleigh Scattering, HRS), and best transparency/non-linearity trade off yet for such materials. Stark spectroscopic and DFT investigation of this compound, plus NMe2 and carbazole analogues, show that its high performance results from a combination of strongly dipolar electronic transitions, and strong electronic communication across the π-system.
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Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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