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Incorporation of Sulfate or Selenate Groups into Oxotellurates(IV): II. Compounds with Divalent Lead
Author(s) -
Weil Matthias,
Shirkhanlou Mahdi
Publication year - 2017
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.201700016
Subject(s) - chemistry , crystallography , selenate , square pyramidal molecular geometry , crystal structure , coordination number , divalent , isostructural , sulfate , trigonal pyramidal molecular geometry , ion , hydrothermal synthesis , hydrothermal circulation , inorganic chemistry , selenium , geology , organic chemistry , seismology
Four mixed oxochalcogenate compounds in the systems Pb II / X VI /Te IV /O/(C), ( X VI = S and Se) were obtained as minority phases under hydrothermal conditions (210 °C, one week). Their compositions as determined on the basis of single‐crystal X‐ray diffraction data are Pb 3 (SeO 4 )(TeO 3 ) 2 , Pb 7 O 4 (SeO 4 ) 2 (TeO 3 ), Pb 5 (SeO 4 ) 2 (TeO 4 )(CO 3 ), and Pb 2 (SO 4 )(TeO 3 ). All crystal structures are centrosymmetric, and in each case the oxochalcogenate anions are isolated from each other. The Pb 2+ cations exhibit distorted coordination polyhedra with coordination numbers ranging from six to ten, in the majority of cases with a “one‐sided” coordination by oxygen atoms. The presence of the very rare square‐pyramidal Te IV O 4 4– anion distinguishes the structure of Pb 5 (SeO 4 ) 2 (TeO 4 )(CO 3 ) from the other structures, where the oxotellurate(IV) anions exist in the TeO 3 2– trigonal‐pyramidal configuration.