In this thesis, the trinuclear Pd(II) complexes were synthesized with 2-bormo4- phenyleacetophenonoxime.To‌‌‌‌‌reparatiooftheligand,a mixture of hydroxylamine hydrochloride and 2-bormo4-phenyleacetophenon in ethanol was stirred at reflux temperature for 5 h. Then the ligand was added to solution of Pd(OAc) 2 and methanol for preparation of Pd(II) complexes. The complexes were characterized by FT-IR and 31 P{ 1 H}-NMR. In second part , for preparation of a nano catalyst, the Pd(II) nanocomplex ([Pd{? 2 (C,C)-C 6 H 4 (Ph 2 PCHC(O)C 6 H 4 -NO 2 -4)}Cl(PPh 3 )]) wa supported on titania by a very simple method using water. Titania is readily available, cheap, and non- This catalyst showed excellent activity and stability in the Suzuki cross-coupling reaction with different aryl halides. It was found that , for aryl halides with various electron-donating and electron-withdrawing groups the coupling reaction of substrate with arylboronic acid proceeded smoothly at low catalyst loading (0.1 mol% Pd). The transmission electron microscopy (TEM) image of the fresh nanocatalyst showed that the palladium complex was dispersed on the TiO 2 surface. The average particle diameter by size distribution histograms was found to be about 69nm.The recycling test showed that the catalyst can be used many times in repeating cycles without decreasing in the activity. The hot filtration test confirms the heterogeneous character of the catalytically active species.