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Crystallochemistry of some new niobium bromides with (Nb 6 Br 18 ) units: Structures of CsErNb 6 Br 18 and Cs 2 EuNb 6 Br 18
Author(s) -
Cordier Stéphane,
Perrin Christiane,
Sergent Marcel
Publication year - 1993
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.19936190403
Subject(s) - halogen , niobium , crystallography , crystal structure , chemistry , lanthanide , single crystal , x ray crystallography , formula unit , diffraction , inorganic chemistry , ion , physics , alkyl , organic chemistry , optics
Two new series of Nb 6 bromides, CsRENb 6 Br 18 (RE = all the lanthanides excepted Eu and Yb, + Y) (type H ) and M 2 RENb 6 Br 18 (M = Cs, Rb, Tl; RE = Eu, Yb) (type R ) have been isolated. The crystal structures of CsErNb 6 Br 18 and Cs 2 EuNb 6 Br 18 , isotypic with the corresponding chlorides, have been determined by single crystal X‐ray diffraction data. The (Nb 6 Br 18 ) intra‐unit strength is related to the nature and the charge of the counter cation. A comparison between the corresponding chlorides and bromides series, based on the chemical properties and the size of the halogen is discussed.