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Lanthanoid Antimonides Ln 2 Sb 5 ( Ln = Sm, Gd, Tb, Dy) and Rationalization of Chemical Bonding within the Antimony Polyanion by Combining the Zintl‐Klemm Concept with Bond‐Length Bond‐Strength Relationships
Author(s) -
Jeitschko Wolfgang,
Altmeyer Rainer O.,
Schelk Michael,
Rodewald Ute Ch.
Publication year - 2001
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 - 10.1002/1521-3749(200108)627:8<1932::aid-zaac1932>3.0.co;2-s
Subject(s) - antimony , crystallography , lanthanide , chemistry , bond length , dysprosium , bond strength , coordination number , octahedron , atom (system on chip) , crystal structure , inorganic chemistry , ion , adhesive , organic chemistry , layer (electronics) , computer science , embedded system
The title compounds are formed by peritectic reactions. Single crystals could be isolated from samples with high antimony content. Their structure was determined for Dy 2 Sb 5 from four‐circle X‐ray diffractometer data: P 2 1 / m , a = 1306.6(1) pm, b = 416.27(4) pm, c = 1458.4(1) pm, β = 102.213(8)°, Z = 4, R = 0.061 for 2980 structure factors and 86 variable parameters. All dysprosium atoms have nine antimony neighbors forming tricapped trigonal prisms with Dy–Sb distances varying between 308 and 338 pm. The antimony atoms occupy ten different sites with greatly varying coordination. One extreme case is an antimony atom surrounded only by dysprosium atoms in trigonal prismatic arrangement, the other one is an antimony atom in distorted octahedral antimony coordination. The various antimony‐antimony interactions (with Sb–Sb distances varying between 284 and 338 pm) are rationalized by combining the Zintl‐Klemm concept with bond‐length bond‐strength considerations.