
Zeitschrift fur Anorganische und Allgemeine Chemie p. 2231 - 2236 (2004)
Update date:2022-08-23
Topics:
Barboza Da Silva, Carlos F.
Schwarz, Simon
Mestres, Montserrat Galceran
Straehle, Joachim
The silver triazenido complex [PPh4]2[Ag 4Cl4-(ClC6H4N3C 6H4Cl)2] (1) is formed by the reaction of silver bis(p-chlorinephenyl)triazenide with [PPh4]Cl in THF. It crystallizes in the monoclinic space group C2/c with a = 2816.9(3), b = 946.67(7), c = 2552.4(3) pm, β = 90.22(1)° and Z = 4. In the centrosymmetric anion of 1 the four Ag atoms together with two Cl atoms form a distorted octahedron. The Ag atoms are in equatorial positions. They are bridged by two Cl atoms and two triazenido ligands. The reaction of [Et4N]Br with silver bis(p-tolyl)pentaazadienid in THF yields [Et4N][Ag 2(tolyl-N5-tolyl)3] (2a). An analogous compound, [(n-Bu)4N][Ag2(tolyl-N5-tolyl) 3] (2b) is obtained by the reaction of [(n-Bu)4N]I with silver bis(p-tolyl)pentaazadienid in THF, when a threefold excess of the pentaazadienid is used. If both educts are used in equal amounts then [(n-Bu)4N]3[Ag3I6] (3) is formed. 2a crystallizes as 2a×2THF in the triclinic space group P1 and a = 1303.6(3), b = 1471.3(4), c = 1811.6(2) pm, α = 98.51(2)°, β = 93.33(2)°, γ = 112.50(2)° and Z = 2. The two Ag atoms in the anions of 2a and 2b are bridged by three pentaazadienido ligands with their atoms N1 and N3. One of the Ag atoms is in addition coordinated by the atoms N5 of two of the ligands, resulting in different coordinations for the two Ag atoms in form of a trigonal planar for one and a distorted square pyramidal arrangement for the other. 3 forms orthorhombic crystals with the space group Pca21 and a = 1675.0(6), b = 1698.8(2), c = 2612.8(5) pm and Z = 4. The anion [Ag3I6]3- is built up by three AgI4 tetrahedra sharing common faces. The silver triazenido and pentaazadienido complexes, [Ag(ClC6H4N3C6H 4Cl]2 and [Ag(tolyl-N5-tolyl)]2 are oxidized by I2 to form the azo compounds [ClC6H 4N=NC6H4Cl] (4) and [tolyl-N=N-tolyl] (5) as well as N2.
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