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Two palladium(II) complexes, [Pd(bipy)(BzPhe N,O)] and [Pd(phen)(BzPhe N,O)]·4H 2 O were synthesized by reactions between Pd(bipy)Cl 2 and BzPheH 2( N benzoyl β phenylalanine), Pd(phen)Cl 2 and BzPheH 2 in water at pH~9, with their structures determined by X ray diffraction analysis. The Pd atom is coordinated by two nitrogen atoms of bipy (or phen), the deprotonated amido type nitrogen atom and one of the carboxylic oxygens of BzPhe (BzPhe= N benzoyl β phenylalaninate dianion). In the complex [Pd(phen)(BzPhe N,O)]·4H 2O, the side chain of phenylalanine is located above and approximately parallels to the coordination plane. Both the aromatic aromatic stacking interaction between the phenyl ring of phenylalanine and phen, and the metal ion aromatic interaction between the phenyl ring of phenylalanine and Pd(II) were observed. [Pd(bipy)(BzPhe N,O)] has the phenylalanyl side chain oriented outwards from the coordination plane, which is mainly due to the interaction between the carbonyl oxygen atom of the amido group and the phenyl ring of phenylalanine. The reason for the different orientation of phenylalanyl side chain in the complexes was suggested.
Pd (bipy) (BzPhe N, O) [Pd (phen) (BzPhe N, O) ] 4H 2 O were synthesized by reactions between Pd (bipy) Cl 2 and BzPheH 2 (N benzoyl β phenylalanine), Pd (phen) Cl 2 and BzPheH 2 in water at pH ~ 9, with their structures determined by X ray diffraction analysis. The Pd atom is coordinated by two nitrogen atoms of bipy (or phen), the deprotonated amido type nitrogen atom and one of the carboxylic oxygens of BzPhe (BzPhe = N benzoyl β phenylalaninate dianion). In the complex [Pd (phen) (BzPhe N, O) · 4H 2O, the side chain of phenylalanine is located above and approximately parallels to the coordination plane. Both the aromatic around stacking interaction between the phenyl ring of phenylalanine and phen, and the metal ion aromatic interaction between the phenyl ring of phenylalanine and Pd ( II) were observed. [Pd (bipy) (BzPhe N, O) ] has the phenylalanyl side chain oriented outwards from the coordinatio n plane, which is mainly due to the interaction between the carbonyl oxygen atom of the amido group and the phenyl ring of phenylalanine. The reason for the different orientation of phenylalanyl side chain in the complexes was suggested.