Push–pull terpyridine derivatives 3 were synthesized and characterized in order to study the variations produced in their optical and electronic properties by linking different (hetero)aromatic electron donor moieties at 4′-position of the electron deficient terpyridine moiety. The final donor-acceptor systems 3a-g were synthesized in fair to good yields by Kröhnke condensation of the precursor aldehydes 1, with 2-acetylpyridine 2. Hyper-Rayleigh scattering in dioxane solutions using a fundamental wavelength of 1064 nm was employed to evaluate their second-order nonlinear optical properties. Terpyridine derivative 3g functionalized with the 9-ethyl-9H-carbazolyl group exhibited the largest first hyperpolarizability (β = 610 × 10⁻³⁰ esu, using the T convention) thus indicating its potential application as a second harmonic generation (SHG) chromophore. Terpyridine derivatives 3 were also used as ligands for the synthesis of novel [Ru^II(tpy)(NCS)₃]^– complexes, prepared in good yields by a two-step procedure involving the preparation of [Ru^III(tpy)(Cl₃)] as intermediates. Ruthenium^II complexes display a broad absorption in the visible range, accounting for their very dark color. Their redox behaviour is mainly characterized by the Ru^II-Ru^III oxidation and by the ligand-centered reduction, whose potentials can be finely tuned by the electronic properties of the aromatic substituents on the terpyridine ligand. Hyper-Rayleigh scattering in methanol solutions using a fundamental wavelength of 1064 nm was also employed to evaluate their second order nonlinear optical properties.

合成并表征推挽式吡啶吡啶衍生物3，以研究通过在缺电子的吡啶吡啶部分的4'-位置连接不同的（杂）芳族电子供体部分而在其光学和电子性质中产生的变异。最终的供体-受体体系3a-g通过前驱物醛1与2-乙酰基吡啶2的Kröhnke缩合以合理的产率合成。在二恶烷溶液中使用1064 nm基本波长的超瑞利散射来评估其二阶非线性光学性质。用9-乙基-9 H官能化的三联吡啶衍生物3g-咔唑基团表现出最大的第一次超极化性（ 使用T常规，β  = 610×10 ^-30 esu），从而表明其潜在的应用为二次谐波生成（SHG）发色团。特吡啶吡啶衍生物3也用作合成新型[Ru ^II（tpy）（NCS）₃ ] ^-配合物的配体，该络合物通过包括[Ru ^III（tpy）（Cl ₃）的两步制备法以高收率制备）]作为中间体。钌^II配合物在可见光范围内显示出广泛的吸收性，这归因于其非常深的颜色。其氧化还原行为的主要特征是Ru ^II-Ru ^III氧化和以配体为中心的还原，其电位可以通过三联吡啶配体上的芳族取代基的电子性质进行微调。还使用1064 nm基本波长在甲醇溶液中的超瑞利散射来评估其二阶非线性光学性质。