Design and Synthesis of Pentadentate N3O2-Type Donor Schiff Bases and their Interactive Behavior with UO2(VI) Ion: An Instance of Strange Behavior of Pyridine in a Uranyl (UO22+) Complex

IF 0.4 4区化学 Q4 CRYSTALLOGRAPHY

Journal of Chemical Crystallography Pub Date : 2022-04-27 DOI:10.1007/s10870-022-00944-2

Renu Kumari, Jyoti, Jai Deo Singh, Ray J. Butcher, Christopher Richardson

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引用次数: 0

Abstract

Mononuclear uranyl(VI) Schiff base complexes of formula [UO₂(L₁)]·py (1·py) {[UO₂(L²)]}₂·MeCN·H₂O (2·MeCN·H₂O) have been prepared and characterized by both IR and ¹H NMR spectroscopy and X-ray crystallography. The complex species 1·py crystallizes as orange needle-like crystals in the orthorhombic space group, Pbca, with 8 molecules per unit cell. Interestingly, the pyridine molecule does not participate in coordination to the metal center and was found as a solvent molecule embedded in the crystal structure with weaker interactions to the metal complex. The crystals of the complex species, 2·MeCN·H₂O, crystallized in a monoclinic form, space group, P2₁, with 2 molecules in the asymmetric unit. The two molecules [(UO₂)(L₂)(CH₃CN or H₂O)] in the asymmetric unit of 2·MeCN·H₂O exhibit a competitive (CH₃CN/H₂O) scenario without any direct coordination to the uranyl ion.

Graphical Abstract

Uranyl(VI) Schiff base complexes of general formula [UO₂(L₁)]·py (1·py) and {[UO₂(L²)]}₂·MeCN·H₂O (2·MeCN·H₂O) have been prepared and characterized by spectroscopic analysis and X-ray crystallography.

Abstract Image

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五齿n3o2型施主席夫碱的设计与合成及其与UO2(VI)离子的相互作用:吡啶在铀酰(UO22+)配合物中的奇异行为

制备了式为[UO2(L1)]·py(1·py) {[UO2(L2)]}2·MeCN·H2O(2·MeCN·H2O)的单核铀酰(VI)希夫碱配合物，并用IR、1H NMR和x射线晶体学对其进行了表征。配合物1·py在正交空间群Pbca中结晶为橙色针状晶体，每细胞有8个分子。有趣的是，吡啶分子不参与与金属中心的配位，而是作为溶剂分子嵌入在晶体结构中，与金属配合物的相互作用较弱。2·MeCN·H2O为单斜晶，空间群为P21，不对称单元为2个分子。在2·MeCN·H2O的不对称单元中，两个分子[(UO2)(L2)(CH3CN或H2O)]在没有与铀酰离子直接配位的情况下表现出竞争(CH3CN/H2O)的情况。摘要制备了通式[UO2(L1)]·py(1·py)和{[UO2(L2)]}2·MeCN·H2O(2·MeCN·H2O)的脲酰(VI)希夫碱配合物，并用光谱分析和x射线晶体学对其进行了表征。

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来源期刊

Journal of Chemical Crystallography 化学-光谱学

CiteScore

1.50

自引率

12.50%

发文量

审稿时长

6.3 months

期刊介绍： Journal of Chemical Crystallography is an international and interdisciplinary publication dedicated to the rapid dissemination of research results in the general areas of crystallography and spectroscopy. Timely research reports detail topics in crystal chemistry and physics and their relation to problems of molecular structure; structural studies of solids, liquids, gases, and solutions involving spectroscopic, spectrometric, X-ray, and electron and neutron diffraction; and theoretical studies.