Synthesis and crystal structure of bis(tetraethylammonium) octabromo-triselenate(II)-{dibromodiselenate(I)}, [NEt4](2)[Se3Br8(Se2Br2)], the salt of a mixed-valence bromoselenate(II,I) anion

Janickis V; Milius W; Tornroos KW

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Synthesis and crystal structure of bis(tetraethylammonium) octabromo-triselenate(II)-{dibromodiselenate(I)}, [NEt4](2)[Se3Br8(Se2Br2)], the salt of a mixed-valence bromoselenate(II,I) anion

机译：八价溴硒酸酯（II，I）阴离子的盐双（四乙铵）八溴三硒酸酯（II）-{二溴二硒酸酯（I）}，[NEt4]（2）[Se3Br8（Se2Br2）]的合成和晶体结构

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The brown crystals of [NEt4](2)[Se3Br8(Se2Br2)] (1) were obtained when selenium and bromine reacted in the solution of acetonitrile in the presence of tetraethylammonium bromide. The crystal structure of 1 has been determined by the X-ray methods and refined to R=0.0308 for 10433 reflections. The crystals are monoclinic, space group P2(1) with Z = 2 and a = 12.0393(3) angstrom b = 11.8746(3) angstrom, c = 13.1946(3) angstrom, beta = 96.561(1)degrees (123 K). In the solid state structure the anion of I is built up of Se3Br8 unit which consists of a triangular arrangement of three planar SeBr4 units sharing a common edge through two mu(3)-bridging Br atoms, and one Se2Br2 molecule which is linked to one of mu(3)-bridging Br atoms. The three Se-II atoms form a triangle which is almost perpendicular to the planes given by three SeBr4 moieties. The contact between the mu(3)Br and the Se-1 atom of the Se2Br2 molecule is 3.1711(8) angstrom and can be interpreted as a bond of the donor-acceptor type with the mu(3)Br as donor and the Se,Br, molecule as acceptor. The terminal Se-II-Br and mu(3)Br-Se-II bond lengths are in the ranges 2.3537(7)-2.4737(7) angstrom and 2.7628(7)-3.1701(7) angstrom, respectively. The bond lengths in coordinated Se,Br, molecule are: Se-1-Se-1 2.2636(9) angstrom, Se-1-Br = 2.3387(11) and 2.3936(8) angstrom.

机译：当硒和溴在四乙基溴化铵存在下在乙腈溶液中反应时，获得[NEt4]（2）[Se3Br8（Se2Br2）]（1）的棕色晶体。 1的晶体结构已通过X射线方法确定，并针对10433次反射提炼为R = 0.0308。晶体是单斜晶体，Z = 2和a = 12.0393（3）的空间群P2（1），b = 11.8746（3）埃，c = 13.1946（3）埃，β= 96.561（1）度（123 K）。在固态结构中，I的阴离子由Se3Br8单元组成，该单元由三个平面SeBr4单元的三角形排列组成，三个平面SeBr4单元通过两个mu（3）桥连的Br原子共享一个公共边，以及一个Se2Br2分子与一个相连mu（3）-桥连Br原子的数目。三个Se-II原子形成一个三角形，该三角形几乎垂直于三个SeBr4部分给出的平面。 mu（3）Br和Se2Br2分子的Se-1原子之间的接触为3.1711（8）埃，可以解释为供体-受体类型的键，而mu（3）Br作为供体和Se ，Br，分子为受体。末端Se-II-Br和mu（3）Br-Se-II键长分别在2.3537（7）-2.4737（7）埃和2.7628（7）-3.1701（7）埃之间。配位的Se，Br分子中的键长为：Se-1-Se-1 2.2636（9）埃，Se-1-Br = 2.3387（11）和2.3936（8）埃。

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《Zeitschrift fur Anorganische und Allgemeine Chemie》 |2005年第5期|共5页
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Janickis V; Milius W; Tornroos KW;
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正文语种 eng
中图分类化学;
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selenium; bromoselenates(II; I); mixed-valence Se-II-se(I) compounds; crystal structure; tetraethylammonium ion; PHENYLTRIMETHYLAMMONIUM SALTS; SELENIUM; BROMIDE;

机译：硒;溴代硒酸酯（II;I）;Se-II-se（I）混合价化合物;晶体结构;四乙铵离子;苯甲基三甲基铵盐;硒;溴化物;

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Synthesis and crystal structure of bis(tetraethylammonium) octabromo-triselenate(II)-{dibromodiselenate(I)}, [NEt4](2)[Se3Br8(Se2Br2)], the salt of a mixed-valence bromoselenate(II,I) anion

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