The alkali metal copper(II) oxidotellurates(IV) Li2Cu2Te3O9, Li2Cu3Te4O12, Rb2Cu3Te6O16 and Cs2Cu3Te6O16 – four new structure types. Issue 23 (22nd April 2022)

• Record Type: Journal Article
• Authors: Eder, Felix; Weil, Matthias
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 648:Issue 23(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-22
• Subjects: crystal structure determination -- crystal chemistry -- copper -- tellurium -- structural comparison; Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.202200089
• Languages: English
• ISSNs: 0044-2313

Abstract

Abstract: Four new M I /Cu II /Te IV /O phases were obtained under hydrothermal conditions or with water as a mineralizer, and their crystal structures determined by single‐crystal X‐ray diffraction. Li2 Cu2 Te3 O9 comprises trigonal‐pyramidal [TeO3 ], distorted tetrahedral [LiO4 ] and distorted square‐pyramidal [CuO5 ] units, forming a framework penetrated by channels into which the electron lone pairs of the Te IV atoms are directed. Li2 Cu3 Te4 O12 contains isolated trigonal‐pyramidal [TeO3 ] units, tetrahedral [LiO4 ] groups forming [Li2 O6 ] dimers by sharing an edge, as well as square‐planar [CuO4 ] and square‐pyramidal [CuO5 ] units, forming ∞ 1 ${_\infty ^1 }$ [Cu3 O10 ] chains oriented parallel to [100]. These units also form a framework structure with channels where the electron lone pairs reside. Rb2 Cu3 Te6 O16 and Cs2 Cu3 Te6 O16 have isopointal crystal structures containing isolated [TeO3 ] groups and ∞ 1 ${_\infty ^1 }$ [Te4 O10 ] chains oriented parallel to [010]. While in Rb2 Cu3 Te6 O16 both Cu sites are 4‐coordinate in form of nearly square‐planar [CuO4 ] units, in Cs2 Cu3 Te6 O16 one Cu site has a fifth oxygen contact resulting in a distorted square‐pyramidal [CuO5 ] polyhedron. Both crystal structures are made up from two alternating layer types stacked along [100]. The differences between Rb2 Cu3 Te6 O16 and Cs2 Cu3 Te6 O16 originate almost exclusively from the layer type consisting of the 5‐coordinate Cu site in Cs2 Cu3 Te6 O16, while the other layer type shows almost no difference. A quantitative comparison between the two crystal structures is given. Abstract :