Abstract
The silver(I) complex [Ag 2(μ-ppye) 2][PF 6] 2·2(CH 3) 2CO (ppye=1-(diphenylphosphino)-2-(2-pyridyl)ethane) has been prepared and its crystal structure determined by single-crystal X-ray diffraction. The dication [Ag 2(μ-ppye) 2] 2+ exhibits a twelve-membered annular core structure with ppye ligands bridging head-to-tail the silver ions, which lie in a distorted linear environment. Each Ag(I) centre shows also a weak electrostatic interaction with the oxygen atom of an acetone molecule (Ag ⋯ O=2.86(1) Å), which is probably responsible for the deviation from linearity of the PAgN angle (165.8(1)°). The size of the cavity can be estimated on the basis of the Ag ⋯ Ag distance, 5.077(1) Å. Crystallographic data: monoclinic, space group P2 1/ n, a=13.330(1), b=13.469(1), c=14.102(2) Å, β=103.02(5)°, U=2466.7(6) Å 3, Z=2, R=0.071. The dynamic behaviour of the complex in acetone solution has been investigated by means of variable-temperature multinuclear ( 1H, 13C and 31P) NMR spectroscopy.
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