Dib ligand effects on Zn^II coordination polymers built from a semirigid tricarboxylate ligand: Topological structures and luminescence properties

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• 作者：Chang-Dai Si^a ; ^{sicd2008@126.com" class="auth_mail" title="E-mail the corresponding author} ; Jia-Cheng Liu^b ; ^{jcliu8@nwnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dib Ligand ; Coordination polymers ; Semirigid tricarboxylate ligand ; Topological structures ; Luminescence properties
• 刊名：Polyhedron
• 出版年：2016
• 出版时间：5 September 2016
• 年：2016
• 卷：115
• 期：Complete
• 页码：92-98
• 全文大小：3394 K

文摘

Four complexes based on H₃L, namely, [Zn₂(L)(dib)_1.5(μ₂-O)]_n (1), {[Zn(HL)(dib)]·H₂O}_n (2), [Zn(HL)(dib)]_n (3), [Zn₃(L)₂(dib)₃]_n (4) [4-[(3-carboxynaphthalen-2-yl)oxy]phthalic acid (H₃L) and 1,4-di(1H-imidazol-1-yl) benzene (dib)] have been synthesized by solvothermal reactions. Complex 1 displays (3,5)-connected gra-type topology with a Schläfli symbol of (6³)(6⁹.8), the two-dimensional (2D) structure was extended to a three-dimensional (3D) framework by dib ligand, showing an enhanced luminescence intensity. Complex 2 possesses a 2D 4-connected sql-type topology with a Schläfli symbol of (4⁴.6²), which are further stacked with each other by C–H⋯π and C–H⋯O interactions to form a 3D supramolecular framework. Complex 3 features a novel 4-connected topology with a Schläfli symbol of (3³.4².5), the driving forces in 3D supramolecular​ frameworks are C–H⋯O, C–H⋯π, and π⋯π stacking interactions in 3. Complex 4 has a 3D (3,4,4)-connected net with a Schläfli symbol of (6³.8.10²)₂(6³)₂(6⁴.8.10), representing a new topological prototype. In addition, complexes 1–4 exhibit non-interpenetrated structures owing to the steric hindrance of the naphthalene ring. It is also noteworthy that dib Ligand may not only affect the coordination mode of polycarboxylate acid but also subtly adjust the pH value of reaction solvent as well as N,N′-dimethylformamide (DMF). Additionally, the luminescent properties were investigated in the solid state at room temperature for 1–4.