In this thesis, dinuclear complex [Pd(2-phaniline)(µ-Cl)] 2 was synthesized by treating the system 2-phaniline/PdCl2/NaCl/NaOAc in a molar ratio of 1/1/2/1 in methanol at room temperature for one week. This complex precipitated in the reaction medium, was isolated by filtration and purified by washing adequate solvents. In the IR of Pd(2-phaniline)(µ-Cl)] 2 the asymmetric and symmetric stretchings of the amino group appeared in lower frequency in comparison to free 2-phaniline ligand. The reaction of dinuclear complex and monodentate ligands [L = pyridine, 4-picoline, symcollidine ] gave mononuclear orthopalladated complexes [Pd(2-phaniline)(py)(Cl)], [Pd(2-phaniline)(4-Mepy)(Cl)] and [Pd(2-phaniline)(sym-collidine)(Cl)] in the condition of THF: acetone (15: 5) as solvent, room temperature and 6h. The dinuclear complex was reacted with AgX(X = CF3SO3, BF4) to remove the Cl bridges, then addition of bidentate ligands such as [(phen, bipy, dppe, dppp] to preparation of mononuclear orthopalladated complexes [Pd(2-phaniline)(phen)], [Pd(2-phaniline)(bipy)], [Pd(2-phaniline)(dppe)] and [Pd(2-phaniline)(dppp)]. The complexes were chracterized by FT-IR, 1H NMR, 13C NMR, 31P NMR and X-ray diffraction study of [Pd(2-phaniline)(sym-collidine)(Cl)] . In the FT-IR of all compounds, the difference in N-H and in some of them in N=C bonds in comparison to free ligand is observed. 1H NMR and 13C NMR showed (2) proton and carbon of the all compounds resonate at low frequencies. It may be occurred because of anisotropic effect of aromatic ring of mono and bidentate ligands that coordinated with metallic center, and also a reason for synthesizing mentioned compounds. Moreover, it shows that the monodentate ligands and palladated phenyl ring are in cis arrangement. In two cases, complexes [Pd(2-phaniline)(dppe)] and [Pd(2-phaniline)(dppp)], the 31P NMR was recorded that chemical shift of the phosphorus nucleus was in the reasonable interval from free ligands. In the 31P NMR of free dppe and d only one peak is observed, but in these complexes, two and four peaks wewr recorded for [Pd(2-phaniline)(dppe)] and [Pd(2-phaniline)(dppp)], respectively. In former, two peaks is because of difference in trans group , and for the latter, two excess peaks may be due to opening the formed chelate by d ligand that is caused the free phosphorus atom sense different electronic space’s. Moreover, The X-ray crystal structure of compound [Pd(2-phaniline)(sym-collidine)(Cl)] was determined. This complex crystallized in the monoclinic space group P21/n . After characterization, the complexes were tested in the Suzuki and the Heck reactions that the catalytic activity was much more better in former one. Finally, compound [Pd(2-phaniline)(phen)]dispersed onTiO2 to prepare an heterogeneous catalyast that SEM analyzing showed it is synthesized in nano scale.