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
作者:Alessia Colombo、Claudia Dragonetti、Stefania Righetto、Dominique Roberto、Adriana Valore、Tiziana Benincori、Francesca Colombo、Francesco Sannicolò
DOI:10.1039/c2jm33509c
日期:——
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.
两种新配体 Ln:N,N-二丁基-(4,5-二氮杂芴基-9-亚基-1,3-戊二烯基)-胺(L2)和 9-[(1-氮烯基)亚甲基]-4,5-二氮杂芴(L3)、制备并表征了相关的 Zn(II) 配合物,以及具有不同抽电子强度的辅助配体([Zn(CH3CO2)2Ln]、[Zn(CF3CO2)2Ln] 和 [Zn(CF3SO3)2Ln])。利用 EFISH 技术研究了它们显著的二阶 NLO 特性。据我们所知,[Zn(CF3SO3)2L2]的δ²1.91 值与浓度密切相关,达到了所报道的 Zn(II) 复合物的最高值。