Synthesis, structure and third-order optical nonlinearities of hyperbranched metal phthalocyanines containing imide units

Publication date: July 2018
Source:Dyes and Pigments, Volume 154
Author(s): Tingfeng Wang, Xin Wang, Jiliang Zhang, Chunrui Wang, Junfeng Shao, Zhenhua Jiang, Yunhe Zhang
A series of thermally stable and soluble hyperbranched metal phthalocyanines oligomers containing imide units (HMePcIs) ending with carboxyl groups were synthesized successfully. The number of the Pc rings was first estimated by analyzing the terminal carboxyl groups in the ¹H NMR spectra of HMePcIs. The third-order nonlinear optical (NLO) properties of these oligomers were measured by a Z-scan technique with a pulsed Q-switched Nd: YAG laser system at 532 nm. The introduced imide unit noticeably improved the thermal stability and third-order nonlinear susceptibility, χ⁽³⁾. The 5 wt% weight loss temperature for HMePcIs exceeded 410 °C, and the χ⁽³⁾ values reached the order of 10⁻¹³esu. The variation of the center metals of HMePcIs influenced the third-order optical nonlinearity, and the third-order nonlinear susceptibility χ⁽³⁾ values of hyperbranched metal (Zn,Cu, Ni) phthalocyanines oligomers were found to rank in the order of HZnPcI > HCuPcI > HNiPcI.

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