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Synthesis, Structure, and Properties of LiNb 6 Cl 15
Author(s) -
Baján Béla,
Balzer Gert,
Meyer H.Jürgen
Publication year - 1997
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.19976231109
Subject(s) - niobium , crystallography , lithium (medication) , ion , atom (system on chip) , chloride , crystal structure , chemistry , materials science , metallurgy , medicine , organic chemistry , computer science , endocrinology , embedded system
Black single crystals of LiNb 6 Cl 15 were obtained from reactions of Nb powder, NbCl 5 and LiCl in sealed niobium tubes at 850°C. The heavy atom structure of LiNb 6 Cl 15 ( Ia 3 d (no. 230), Z = 16, a = 2055.5(2) pm at 100 K, R(F) = 0.028, R(F 2 ) = 0.053) is isotypic with the structure of Ta 6 Cl 15 . The [Nb 6 Cl 12 ] 2+ clusters in the structure are three‐dimensionally interconnected via three additional Cl a−a . These bridge all vertices of niobium clusters, consistent with [Nb 6 Cl 12 i Cl 6/2 a−a ] − (the NbCl a–a Nb angles are 140°). At low temperatures the lithium ions are disordered over one‐third of sites (48 f), occupying cavities inside of two distorted corner‐sharing tetrahedra of chloride. These positions for lithium represent the narrowest sections of infinite channels in the structure built up by chloride. An increased lithium ion mobility is obtained above 170 K by 7 Li‐NMR measurements.