Premium
Phase Formation Studies of Lead(II) Copper(II) Oxotellurates: The Crystal Structures of Dimorphic PbCuTeO 5 , PbCuTe 2 O 6 , and [Pb 2 Cu 2 (Te 4 O 11 )](NO 3 ) 2
Author(s) -
Weil Matthias,
Shirkhanlou Mahdi,
Stürzer Tobias
Publication year - 2019
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.201800262
Subject(s) - crystallography , triclinic crystal system , monoclinic crystal system , tellurium , crystal structure , copper , octahedron , chemistry , divalent , cationic polymerization , materials science , inorganic chemistry , organic chemistry
Two modifications of the oxotellurate(VI) PbCuTeO 5 were isolated as single crystals from product mixtures obtained from solid state reactions, whereas single crystals of the oxotellurates(IV) PbCuTe 2 O 6 and [Pb 2 Cu 2 (Te 4 O 11 )](NO 3 ) 2 were grown under hydrothermal conditions. The crystal structures of all compounds comprise of characteristic coordination polyhedra, viz. nearly square [CuO 4 ] plaquettes for divalent copper, octahedral [TeO 6 ] units for hexavalent tellurium, trigonal‐pyramidal [TeO 3 ] and bisphenoidal [TeO 4 ] groups for tetravalent tellurium, and distorted [PbO x ] polyhedra for divalent lead. PbCuTeO 5 is dimorphic and crystallizes in a monoclinic and a triclinic modification, related by a translationengleiche group‐subgroup relation of index 2. PbCuTe 2 O 6 represents the ideal composition of the rare mineral choloalite. The characteristic feature of the crystal structure of [Pb 2 Cu 2 (Te 4 O 11 )](NO 3 ) 2 is its layered set‐up, comprised of cationic [Pb 2 Cu 2 (Te 4 O 11 )] 2+ ribbons (width approximately 6.7 Å) sandwiched between nitrate anions that are only weakly bound to the cationic layers.