Abstract
Reaction of silver(I) nitrate with equimolar amounts of the rigid diphos ligand trans-1,2-bis(diphenylphosphino)ethene ( trans-dppen) and some heterocyclic thiones (L) in acetonitrile/methanol solvent gave rise to triply-bridged coordination cages [Ag 2(μ 2- trans-dppen) 3L 2](NO 3) 2. On the other hand, the complexes produced when using the flexible 1,5-bis(diphenylphosphino)pentane (dpppent) turned out to be diphosphine-bridged polymers of the type [Ag(μ 2-dpppent)(L)(ONO 2)] n with the diphosphine ligand acting as bridge between two pseudo-tetrahedraly coordinated metal centres. The structures of one representative for each of the two aforementioned series of complex compounds, namely, [Ag 2(μ 2- trans-dppen) 3(pymtH) 2](NO 3) 2 (pymtH = pyrimidine-2-thione) and [Ag(μ 2-dpppent)(tHpymtH) (ONO 2)] n (tHpymtH = tetrahydropyrimidine-2-thione) have been established by single-crystal X-ray diffraction.
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