Chemistry Letters, Vol.31, No.9, 922-923, 2002
Synthesis and structure of a molecular metal wheel, an octanuclear silver(I) cluster formed by racemic 2-mercaptopropionic acid and triphenylphosphine ligands
The molecular structure of [H4Ag8(2-mpa)(6)(PPh3)(6)].EtOH 1 (2-H(2)mpa=a racernic form of 2-mercaptopropionic acid), prepared by a 1 : 5 molar-ratio reaction of polymeric [Ag(2-Hmpa)](n) 2 suspended in EtOH with PPh3 in CHCl3, was a wheel-type octanuclear silver(I) cluster; the rim of the wheel was constructed with the outside six Ag(mu(3)-S)(2)P units and the axle was formed by the central two Ag(mu(3)-S)(3) units with Ag-Ag separation, 3.122 Angstrom.