Zinc Induced a Dramatic Enhancement of the Nonlinear Optical Properties of an Azo-Based Iminopyridine Ligand

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• 作者：Imen Guezguez ; Awatef Ayadi ; Karolina Ordon ; Konstantinos Iliopoulos ; Diana G. Branzea ; Anna Migalska-Zalas ; Malgorzata Makowska-Janusik ; Abdelkrim El-Ghayoury ; Bouchta Sahraoui
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 10, 2014
• 年：2014
• 卷：118
• 期：14
• 页码：7545-7553
• 全文大小：563K
• 年卷期：v.118,no.14(April 10, 2014)
• ISSN：1932-7455

文摘

An azobenzene based iminopyridine ligand 1 has been synthesized by a condensation reaction between N,N-dimethyl-4,4鈥?azodianiline and 2-formylpyridine. The complexation of the ligand with ZnCl₂ afforded a tetrahedral neutral zinc metal complex (2) formulated as [(Azo-Imino-Py)ZnCl₂]. The crystal structure analysis of the complex indicates the formation of a tetracoordinated zinc(II) ion with the expected tetrahedral geometry. In solid state, a 2D supramolecular architecture reinforced by 蟺鈥撓€ stacking and hydrogen bonding is observed. The UV鈥搗isible spectrophotometric titration studies of the ligand, by increasing amount of ZnCl₂, confirm the existence of single complex species in solution. The nonlinear optical (NLO) investigations by Z-scan technique of both ligand 1 and complex 2 indicate a dramatic enhancement of the NLO absorption of the ligand upon complexation with ZnCl₂. This enhancement is likely to be due to a large dipole moment found for the complex 2 as calculated by DFT/B3LYP methodology.