Reactivity of Double Thioureas Towards Metal Complexes. Synthesis and Crystal Structure of [{(Μ-H)ru3(co)9}2{sc(nph)n (et)(ch2) 2nh(phn) CS}]

By reaction of PhNCS with (MeO)3Si(CH2)3NH(CH2)2NH2 (2: 1 molar ratio), a substituted dithiourea has been obtained which affords a new functionalized xerogel (XGditu) by hydrolysis and polycondensation with (EtO)4Si. This material is able to bind metal species, giving systems of potential interest in catalysis. In order to ascertain the nature of the tethered metal species, the non-siloxanized dithiourea PhNHC(S)N(Et)(CH2)2NHC(S)NHPh (2) has been prepared. It reacts with [Ru3(CO)12] to give the complex {(μ-H)RU3(CO) 9}2(SC(NPh)N(Et)(CH2)2NH(PhN)CS} (4), which contains two distinct hydrido carbonyl clusters bound to the two deprotonated thiourea groups.