Novel highly conjugated push–pull 4,5-diazafluoren-9-ylidene based efficient NLO chromophores as a springboard for coordination complexes with large second-order NLO properties,10.1039/C2JM33509C

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Lactoyl-CoA 全氟丁基戊烷白叶藤碱全氟己基辛烷新白叶藤碱壳寡糖特色专题-生物多肽

Novel highly conjugated push–pull 4,5-diazafluoren-9-ylidene based efficient NLO chromophores as a springboard for coordination complexes with large second-order NLO properties

Francesca Colombo,Francesco Sannicolò

Journal of Materials Chemistry Pub Date : 08/01/2012 00:00:00 , DOI:10.1039/C2JM33509C

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 μβ_1.91 value of [Zn(CF₃SO₃)₂L²] is strongly dependent on concentration, reaching, to our knowledge, the highest value reported for a Zn(II) complex.