Syntheses, Structures and Luminescence of Two Coordination Polymers based on 1,3,5-tris(1-imidazolyl)benzene,Journal of Chemical Crystallography

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Syntheses, Structures and Luminescence of Two Coordination Polymers based on 1,3,5-tris(1-imidazolyl)benzene
Journal of Chemical Crystallography ( IF 0.4 ) Pub Date : 2021-07-07 , DOI: 10.1007/s10870-021-00895-0
Zhong-Lin Li ₁ , Rui Feng ₁ , Sheng-Qing Fan ₁ , De-Shuai Zhang ₁ , Qing-Qing Yang ₁ , Fang-Hua Zhao ₁

Affiliation

Two new coordination polymers (CPs), namely, {[Zn(tib)(SO₄)]·2H₂O}_n (1) and {[Cd(tib)(2,6-pydc)(H₂O)]·H₂O}_n (2), have been hydrothermally synthesized based on the rigid 1,3,5-tris(imidazol-1-yl)benzene (tib) and 2,6-pyridinedicarboxylate (2,6-pydc²⁻) ligands. Both CPs were structurally characterized by single-crystal X-ray diffraction. In 1, the Zn(II) centers are connected by tib to generate a 2D → 2D polythreading honeycomb 6³ bilayer structure with the SO₄²⁻ as rods. The bilayers are further connected by O–H···O hydrogen bonds to result in a 3D supramolecular structure. In 2, the Cd(II) centers are coordinated by 2,6-pydc²⁻ to form binuclear Cd₂ units which are linked by µ₂-tib into 1D chain. The 1D chains are further connected by O–H···O hydrogen bonds, leading to the 2D hydrogen bonded network. Finally, it shows a 2D → 3D interdigitated architecture based on the 2D hydrogen bonded layers through the uncoordinated imidazole rings of tib ligands. The thermogravimetric properties and solid-state photoluminescence of 1 and 2 were investigated.

Graphical abstract

Two new photoluminescent Zn(II) and Cd(II) coordination polymers of 1,3,5-tris(1-imidazolyl)benzene were investigated in this work.

中文翻译：

基于 1,3,5-三(1-咪唑基)苯的两种配位聚合物的合成、结构和发光

两种新的配位聚合物（CP），即{[Zn(tib)(SO ₄ )]·2H ₂ O} _n ( 1 ) 和{[Cd(tib)(2,6-pydc)(H ₂ O)] ·H ₂ O} _n ( 2 )，基于刚性1,3,5-三(咪唑-1-基)苯(tib)和2,6-吡啶二羧酸酯(2,6-pydc ^2- ) 配体。通过单晶 X 射线衍射对两种 CP 进行结构表征。在1 中，Zn(II) 中心通过 tib 连接以生成具有 SO ₄²⁻的 2D → 2D 多丝蜂窝 6 ³双层结构作为杆。双层通过 O-H···O 氢键进一步连接，形成 3D 超分子结构。在2 中，Cd(II) 中心由 2,6-pydc ²⁻协调形成双核 Cd ₂单元，由μ ₂ -tib 连接成一维链。一维链通过O-H···O氢键进一步连接，形成二维氢键网络。最后，它显示了基于 2D 氢键层通过 tib 配体的未配位咪唑环的 2D → 3D 交叉结构。研究了1和2的热重性质和固态光致发光。