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[Te 8 ] 2 [Ta 4 O 4 Cl 16 ]: A Two‐dimensional Tellurium Polycation obtained via Ionic Liquid‐Based Synthesis
Author(s) -
Freudenmann Dominic,
Feldmann Claus
Publication year - 2011
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201100143
Subject(s) - tellurium , ionic liquid , tantalum , chloride , chemistry , crystallography , ionic bonding , ion , inorganic chemistry , analytical chemistry (journal) , catalysis , organic chemistry
By reaction of elemental tellurium, tellurium(IV) chloride, tantalum(V) chloride and tantalum(V) oxychloride in the ionic liquid [BMIM]Cl ([BMIM]Cl:1‐Butyl‐3‐methylimidazolium chloride),[Te 8 ] 2 [Ta 4 O 4 Cl 16 ] is obtained in the form of lucent black crystals. The title compound consists of infinite [Te–Te–(Te 6 )] n 2+ chains (Te–Te: 264.9(1)–284.3(1) pm) and isolated [Ta 4 O 4 Cl 16 ] 4– anions. The [Te–Te–(Te 6 )] n 2+ chains are interconnected to form a two‐dimensional tellurium network (Te–Te: 335.9 pm). Due to this interaction the [Te–Te–(Te 6 )] n 2+ chains in [Te 8 ] 2 [Ta 4 O 4 Cl 16 ] show an arrangement that differs significantly from known polycationic [Te 8 ] n 2+ chains. The two‐dimensional tellurium network is finally separated by tetrameric, corner‐sharing oxidochloridotantalate anions [(TaO 2/2 Cl 4/1 ) 4 ] 4– that are firstly observed. The composition of [Te 8 ] 2 [Ta 4 O 4 Cl 16 ] is confirmed by EDX analysis; its optical band gap is estimated to 1.1–1.2 eV via UV/Vis spectroscopy.