Abstract

A complex of tellurium(IV) bromide with p-toluidinium, (HPT)₂TeBr₆·H₂O, was synthesized, its crystal structure was determined by X-ray diffraction, and its absorption and luminescent properties were studied. A comparative study of the luminescent properties at 77 K was performed for a number of tellurium(IV) bromide complexes with outer-sphere cations: cesium, rubidium, tetraethylammonium, and p-toluidinium. The electronic and geometric aspects determining the absorption and luminescent properties of the tellurium(IV) bromide complexes are considered. At 77 K, (HPT)₂TeBr₆·H₂O is characterized by luminescence in the near-IR range; the luminescence band maximum is significantly red-shifted (>50 nm) with respect to those of the analogues. The luminescence intensity of complex compounds is influenced by the geometric structure (type of anionic sublattice and the structure and degree of distortion of the coordination polyhedron of the s²-ion). The coordination polyhedron distortion and the presence of a dense system of hydrogen bonds account for the minimum luminescence intensity of the (HPT)₂TeBr₆·H₂O complex among other tellurium(IV) bromide compounds.

中文翻译：

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溴化碲与对甲苯(HPT)2TeBr6·H2O配合物的结构和发光性能

摘要

合成了溴化碲与对甲苯胺的配合物(HPT) ₂ TeBr ₆ ·H ₂ O，通过X射线衍射测定了其晶体结构，并研究了其吸收和发光性能。对多种溴化碲 (IV) 与外层阳离子（铯、铷、四乙铵和对甲苯胺）配合物在 77 K 下的发光特性进行了比较研究。考虑了决定溴化碲(IV)络合物的吸收和发光特性的电子和几何方面。在77 K 时，(HPT) ₂ TeBr ₆ ·H ₂ O 的特征是在近红外范围内发光；相对于类似物，发光带最大值显着红移（>50 nm）。复杂化合物的发光强度受几何结构（阴离子亚晶格的类型以及s ² -离子的配位多面体的结构和畸变程度）的影响。配位多面体畸变和致密氢键系统的存在导致(HPT) ₂ TeBr ₆ ·H ₂ O络合物在其他溴化碲(IV)化合物中具有最小发光强度。