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A series of poly-unsaturated pyrrolidino carbene complexes have been synthesized and their first β hyperpolarizabilities evaluated using the Hyper Rayleigh Scattering (HRS) technique. Some of these complexes have good to high β values (up to 543x10 -30 esu). A comparison of the non-linear responses of the complexes with those of the corresponding amides (their isolobal organic analogues)...
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