Synthesis and crystal structure of an Ag20 cluster incorporating in situ generated bipodal [ArP(OEt)S2]- and tripodal [ArPOS2]2- ligands (Ar=4-methoxyphenyl)

The ultrasonic reaction of Lawesson's reagent (2,4-bis(4-methoxyphenyl)-1,3-dithiadiphosphetane-2,4-disulfide, LR) with Ag(OAc) and Ph3P (triphenylphosphane) gave an Ag-20 cluster {[Ag-20(ArP(OEt)S-2)(6) (ArPOS2)(6)(Ph3P)(8)]center dot 2(OAc)center dot 8(H2O)center dot(CHCl3)} (1) (Ar = 4-methoxyphenyl). The core of this cluster is an Ag-based propeller comprised of one triangle central axis and three distorted rectangle leaves. The bipodal and tripodal P/S-containing ligands were generated from in situ P-S bond cleavage and P-O bond formation process. (C) 2010 Elsevier B.V. All rights reserved.