METAL-COMPLEXES TETHERED TO A FUNCTIONALIZED XEROGEL CONTAINING THE BENZOYLTHIOUREA MOIETY - CRYSTAL-STRUCTURES OF TRANS-[PD(HBZTU)2CL2] AND [CU(HBZTU)2CL] (HBZTU=N-BENZOYL-N'-PROPYLTHIOUREA)

The benzoylthiourea-functionalized Xerogel XGbztu, obtained from (EtO) 3Si(CH2)3NHC(S)NHC(O)Ph by hydrolysis and co-condensation with Si(EtO) 4, is able to bind Pd(II) species by reaction with Pd(PhCN)2Cl2. The r esulting system XGbztu/Pd is an active catalyst for the hydrogenation of alkynes. After the catalytic runs, supported sulphur-containing met al aggregates have been evidenced by TEM. The non-siloxanized thiourea CH3(CH2)2NHC(S)NHC(O)Ph (Hbztu) has been used as model for the surfac e binding function of the xerogel. The crystal structures of two Hbztu complexs, namely trans-[Pd(Hbztu)2Cl2], 1, and [Cu(Hbztu)2Cl], 2, hav e been determined by X-ray diffraction methods.