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Synthesis and Structure of Anhydrous Rare‐Earth Perchlorates M(ClO 4 ) 3 (M = La, Ce–Er, Y): Derivatives of the UCl 3 Type of Structure
Author(s) -
Wickleder Mathias S.,
Schäfer Wolfgang
Publication year - 1999
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/(sici)1521-3749(199902)625:2<309::aid-zaac309>3.0.co;2-6
Subject(s) - isostructural , lanthanide , chemistry , anhydrous , crystallography , perchlorate , powder diffraction , crystal structure , stereochemistry , ion , organic chemistry
Anhydrous perchlorates M(ClO 4 ) 3 (M = La, Ce–Er, Y) were obtained by drying the products formed in the reaction of the respective lanthanide oxide with perchloric acid (70%). According to X‐ray powder investigations, they all crystallize with the hexagonal space group P6 3 /m isostructural with the hydrogensulfates of the lighter lanthanides. For the example of Pr(ClO 4 ) 3 a full profile Rietveld refinement based on X‐ray powder data has been undertaken successfully (a = 933.61(3) pm, c = 584.88(2) pm; R p = 0.207, R Bragg = 0.068). The structure of Er(ClO 4 ) 3 was refined from neutron diffraction data (a = 919.7(1) pm, c = 559.8(1) pm; R p = 0.190, R Bragg = 0.106). High temperature X‐ray powder investigations show that thermal expansion occurs mainly in the (001) plane while the c axis remains nearly constant.