Abstract
Two new ligands Ln: N,N-dibutyl-(4,5-diazafluorenyl-9-ylidene-penta-1,3-dienyl)-amine (L2) and 9-[(1-azulenyl)methylene]-4,5-diazafluorene (L3), along with the related Zn(II) complexes with ancillary ligands of different electron withdrawing strengths ([Zn(CH3CO2)2Ln], [Zn(CF3CO2)2Ln] and [Zn(CF3SO3)2Ln]) were prepared and characterized. Their remarkable second-order NLO properties were investigated using the EFISH technique. The μβ1.91 value of [Zn(CF3SO3)2L2] is strongly dependent on concentration, reaching, to our knowledge, the highest value reported for a Zn(II) complex.
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