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Gewellt und eben – La 6 (C 2 )‐Oktaederschichten in Lanthancarbidchloriden
Author(s) -
Mattausch Hansjürgen,
Simon Arndt,
Kienle Lorenz,
Köhler Jürgen,
Hoch Constantin,
Nuss Jürgen
Publication year - 2008
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.200800264
Subject(s) - monoclinic crystal system , octahedron , chemistry , crystallography , metal , crystal structure , lanthanum , stereochemistry , inorganic chemistry , organic chemistry
Sheets of La 6 (C 2 ) Octahedra in Lanthanum Carbide Chlorides – undulated and plane The reaction of Ln, LnCl 3 (Ln = La, Ce) and C yields the hitherto unknown compounds La 8 (C 2 ) 4 Cl 5 , Ce 8 (C 2 ) 4 Cl 5 , La 14 (C 2 ) 7 Cl 9 , La 20 (C 2 ) 10 Cl 13 , La 22 (C 2 ) 11 Cl 14 , La 36 (C 2 ) 18 Cl 23 and La 2 (C 2 )Cl. The gold‐ resp. bronze‐coloured metallic compounds are sensitive to moisture. The reaction temperatures are 1030 °C, 1000 °C, 970 °C, 1020 °C, 1020 °C, 1080 °C and 1030 °C in the order of compounds given, which mostly crystallize in the monoclinic space group P 2 1 / c with a = 7.756(1) Å, b = 16.951(1) Å, c = 6.878(1) Å, β = 104.20(1)° (La 8 (C 2 ) 4 Cl 5 ), a = 7.669(2) Å, b = 16.784(3) Å, c = 6.798(1) Å, β = 104.05(1)° (Ce 8 (C 2 ) 4 Cl 5 ), a = 7.669(2) Å, b = 16.784(3) Å, c = 6.789(1) Å, β = 104.05(3)° (La 20 (C 2 ) 10 Cl 13 ), a = 7.770(2) Å, b = 47.038(9) Å, c = 6.901(1) Å, β = 104.28(3)° (La 22 (C 2 ) 11 Cl 14 ) and a = 7.764(2) Å, b = 77.055(15) Å, c = 6.897(1) Å, β = 104.26(3)° (La 36 (C 2 ) 18 Cl 23 ), respectively. La 14 (C 2 ) 7 Cl 9 ‐(II) crystallizes in Pc with a = 7.775(2) Å, b = 29.963(6) Å, c = 6.895(1) Å, β = 104.21(3)° and La 2 (C 2 )Cl in C 2/ c with a = 14.770(2) Å, b = 4.187(1) Å, c = 6.802(1) Å, β = 101.50(3)°. The crystal structures are composed of distorted C 2 centered La‐octahedra which are condensed into chains via common edges. Three and four such chains join into ribbons, and these are connected into undulated layers with Cl atoms between them. The variations of the structure principle are analyzed systematically.