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Synthese und Kristallstruktur des Holmium(III)‐chlorid‐oxotellurats(IV) HoClTeO 3
Author(s) -
Meier Steffen F.,
Schleid Thomas
Publication year - 2002
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(200203)628:3<526::aid-zaac526>3.0.co;2-0
Subject(s) - pentagonal bipyramidal molecular geometry , holmium , crystallography , orthorhombic crystal system , crystal structure , chemistry , chloride , lone pair , oxygen atom , denticity , hexagonal crystal system , molecule , physics , laser , organic chemistry , optics
Synthesis and Crystal Structure of the Holmium(III) Chloride Oxotellurate(IV) HoClTeO 3 Orange coloured, rod—shaped single crystals of the holmium( III) chloride oxotellurate(IV) HoClTeO 3 (orthorhombic, Pnma; a = 730.25(5), b = 696.54(5), c = 905.18(7) pm; Z = 4) are obtained during attempts to synthesize holmium(III) oxochlorotellurates(IV) by reaction of holmium oxychloride (HoOCl) and tellurium dioxide (TeO 2 ; 1:1—2molar ratio, 800 °C, 40 d) in evacuated silica tubes. The crystal structure contains sevenfold coordinated Ho 3+ cations surrounded by five oxide and two chloride anions forming a pentagonal bipyramid. Interconnection of the [Ho(O1)(O2) 4 Cl 2 ] polyhedra occurs via two edges made of four equatorial oxygen atoms (O2) under formation of ∞ 1 {[Ho(O1) 1/1 ‐(O2) 4/2 Cl 2/1 ] 5‐ } chains running parallel [010]. These arrange as hexagonal closest packing of rods and are linked to each other by Cl ‐ anions to a three—dimensional ∞ 3 {[Ho(O1) 1/1 (O2) 4/2 Cl 2/2 ] 4‐ } network. All Te 4+ cations are embedded therein and exhibit ψ 1 —tetrahedral coordination figures as discrete anionic [Te(O1)(O2) 2 ] 2‐ pyramids due to the stereochemical activity of the non —binding electron pairs („ lone pairs ”). They stabilize the ∞ 3 {[HoO 3 Cl] 4‐ } network via covalent bonds to one axial (O1) and two equatorial oxygen atoms (O2) of each [HoO 5 Cl 2 ] polyhedron.