Cadmium(II)-Organic Frameworks with the Polynuclear Unit: Dimensionality Control and Luminescence Response to Pyridine

IF 1.1 3区化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Russian Journal of Coordination Chemistry Pub Date : 2024-12-08 DOI:10.1134/S1070328424600864

V. A. Dubskikh, A. A. Lysova, D. G. Samsonenko, D. N. Dybtsev

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Abstract

New porous metal-organic frameworks (MOF) [Cd₇(Btdc)₇(Bpa)₂(Dmf)₂(H₂O)₂]·15Dmf·2H₂O (I) and [Cd₇(Btdc)₇(Bpe)₂(Dmf)₂]·15Dmf·3H₂O (II) (H₂Btdc is 2,2′-bithiophene-5,5′-dicarboxylic acid, Bpa is 1,2-bis(4-pyridyl)ethane, Bpe is 1,2-bis(4-pyridyl)ethylene, and Dmf is N,N-dimethylformamide) are synthesized under solvatothermal conditions. The structures and compositions of the compounds are determined by single-crystal X-ray diffraction (XRD) (CIF files ССDС nos. 2364290 (I) and 2364289 (II)) and confirmed by powder XRD, elemental analysis, thermogravimetry, and IR spectroscopy. Compound I has a 2D structure based on the heptanuclear discrete building unit {Cd₇} with the linear structure. Compound II is a 3D MOF in which the {Cd₇} building units are linked into a continuous chain motif due to additional interactions. The formation of either discrete or continuous chains is directly related to the nature of the N-donor bridging ligand (Bpe or Bpa). Compounds I and II have open structures with the accessible volume about 50%. The solvate molecules are replaced by thiophene, benzene, and pyridine, and the luminescence properties of the prepared adducts are studied. Luminescence quenching in the presence of thiophene and an increase in the luminescence intensity in the presence of pyridine accompanied by a change in the quantum yield by 4–5 times are shown.

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镉(II)-具有多核单元的有机骨架：尺寸控制和对吡啶的发光响应

在溶剂热条件下合成了新型多孔金属有机骨架（MOF） [Cd7(Btdc)7(Bpa)2(Dmf)2(H2O)2]·15Dmf·2H2O (I)]和[Cd7(Btdc)7(Bpe)2(Dmf)2]·15Dmf·3H2O (II)] （H2Btdc为2,2 ' -双噻吩-5,5 ' -二羧酸，Bpa为1,2-二（4-吡啶基）乙烷，Bpe为1,2-二（4-吡啶基）乙烯，Dmf为N，N-二甲基甲酰胺）。通过单晶x射线衍射（XRD） (CIF文件ССDС编号2364290 （I)和2364289 (II)）确定了化合物的结构和组成，并通过粉末XRD、元素分析、热重法和红外光谱进行了证实。化合物I具有基于七核离散构建单元{Cd7}的二维线性结构。化合物II是一个三维MOF，其中{Cd7}构建单元由于额外的相互作用而连接成一个连续的链基序。离散链或连续链的形成与n给体桥接配体（Bpe或Bpa）的性质直接相关。化合物I和II具有开放结构，可达体积约为50%。用噻吩、苯和吡啶取代溶剂化物分子，研究了所制备的加合物的发光性能。在噻吩的存在下发光猝灭，在吡啶的存在下发光强度增加，同时量子产率变化4-5倍。

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来源期刊

Russian Journal of Coordination Chemistry 化学-无机化学与核化学

CiteScore

2.40

自引率

15.80%

发文量

审稿时长

7.2 months

期刊介绍： Russian Journal of Coordination Chemistry is a journal that publishes reviews, original papers, and short communications on all aspects of theoretical and experimental coordination chemistry. Modern coordination chemistry is an interdisciplinary science that makes a bridge between inorganic, organic, physical, analytical, and biological chemistry.