Sr(ReO4)Br⋅2H2O and Ba(ReO4)I⋅2H2O: New Representatives of the Ca(ReO4)Cl⋅2H2O Type Structure

IF 0.7 4区化学 Q4 CRYSTALLOGRAPHY

Journal of Chemical Crystallography Pub Date : 2026-03-25 DOI:10.1007/s10870-026-01088-3

Dmitri O. Charkin, Kirill A. Khasanov, Vadim E. Kireev, Vasili Yu. Grishaev, Tatiana A. Eremina, Oleg I. Siidra, Sergey M. Aksenov

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引用次数: 0

Abstract

Crystals of two new alkaline-earth perrhenate halides, Sr(ReO₄)Br⋅2H₂O (1) and Ba(ReO₄)I⋅2H₂O (2) were obtained upon evaporation of aqueous solutions at 95 – 100 °C. Both compounds are isostructural to the previously reported Ca(ReO₄)Cl⋅2H₂O and crystallize in orthorhombic symmetry with the space group Cmcm (a = 7.3906(5) Å, b = 14.241(1) Å, c = 7.1032(5) Å for 1 and a = 7.8624(4) Å, b = 14.0202(5) Å, c = 7.7190(3) Å for 2). Both structures can be regarded as pseudo-layered 3D frameworks comprised of AO₈X capped square antiprisms (A = Sr, Ba; X = Br, I) and ReO₄ tetrahedra which share vertices with formation of slightly distorted tetragonal pseudo-layers linked by OH⋅⋅⋅X hydrogen bonds. The cationic centers (alkaline earths and rhenium) adopt a litharge-like arrangement. The structure seems to be very sensitive to the ratio of A²⁺ and X⁻ constituents; it is as yet observed with calcium, only as a chloride, with strontium, only as a bromide, and with barium, only as an iodide.

Graphical Abstract

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Sr(ReO4)Br⋅2H2O和Ba(ReO4)I⋅2H2O: Ca(ReO4)Cl⋅2H2O型结构的新代表

在95 ~ 100℃的蒸发条件下，得到了Sr(ReO4)Br⋅2H2O(1)和Ba(ReO4)I⋅2H2O(2)两种新型碱土高铼盐卤化物的结晶。这两种化合物与之前报道的Ca(ReO4)Cl⋅2H2O具有相同的结构，并与空间群Cmcm呈正交对称结晶(a = 7.3906(5) Å， b = 14.241(1) Å， c = 7.1032(5) Å， a = 7.8624(4) Å， b = 14.0202（5) Å， c = 7.7190(3) Å）。这两种结构都可以看作是由AO8X覆盖的正方形反棱镜（A = Sr, Ba; X = Br， I）和ReO4四面体组成的伪层状三维框架，它们共享顶点，形成由OH⋅⋅⋅⋅X氢键连接的轻微扭曲的四面体伪层。阳离子中心（碱土和铼）采用类似于锂的排列。该结构似乎对A2+和X−组分的比例非常敏感；到目前为止，钙只以氯化物的形式存在，锶只以溴化物的形式存在，钡只以碘化物的形式存在。图形抽象

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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.