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Coordination number larger than six for fluorine
368
PlOO Coordination
number larger than six for fluorine
Steffi Giese and Konrad Seppelt Freie Universittit Berlin, Institti fiir Arwrganische Berlin 33 (Germany)
und Anal@du?
Chemie, 1000
The crystal structures of TeF,-, MoF,-, WF7- and UF7- are presented; the cation of these compounds is Cs+. In some cases the most common structure, the distorted pentagonal bipyramid, is not observed, but the energetically favoured simple capped octahedron is. The influence of the cation will be discussed by comparison with other previously described heptafluorides.
PlOl Pyridine
complexes
of TaF,,
MoF,, WF4 and ReF,
W. Sawodny and J. Holzbock Abteilung fiir Anarganische
Chemie akr Universitiit
Ulm [Germany)
Complexes MF4. 2py (M = Ta, W) were obtained by treating MX4 * 2py (X = Cl, Br) with anhydrous HF in pyridine solution. By fluorinating ReI,. 2py with TlF in the presence of a reducing agent, crystals of [Repy,Fz]I could be isolated from the reaction mixture. X-ray analysis showed the cation to possess D,, symmetry with fluorine ligands in the Pans position and all four pyridine rings coplanar with the ReF, axis. By treating MoCl,. 3py with anhydrous HF in the presence of pyridinium salts, the oligomeric species [ (Mopy3F2),] +X- were obtained.
PlOO Coordination
number larger than six for fluorine
Steffi Giese and Konrad Seppelt Freie Universittit Berlin, Institti fiir Arwrganische Berlin 33 (Germany)
und Anal@du?
Chemie, 1000
The crystal structures of TeF,-, MoF,-, WF7- and UF7- are presented; the cation of these compounds is Cs+. In some cases the most common structure, the distorted pentagonal bipyramid, is not observed, but the energetically favoured simple capped octahedron is. The influence of the cation will be discussed by comparison with other previously described heptafluorides.
PlOl Pyridine
complexes
of TaF,,
MoF,, WF4 and ReF,
W. Sawodny and J. Holzbock Abteilung fiir Anarganische
Chemie akr Universitiit
Ulm [Germany)
Complexes MF4. 2py (M = Ta, W) were obtained by treating MX4 * 2py (X = Cl, Br) with anhydrous HF in pyridine solution. By fluorinating ReI,. 2py with TlF in the presence of a reducing agent, crystals of [Repy,Fz]I could be isolated from the reaction mixture. X-ray analysis showed the cation to possess D,, symmetry with fluorine ligands in the Pans position and all four pyridine rings coplanar with the ReF, axis. By treating MoCl,. 3py with anhydrous HF in the presence of pyridinium salts, the oligomeric species [ (Mopy3F2),] +X- were obtained.