Bis-Chelated Pd(II)-Amino Acid Complexes: Substitution Reactions of cis-Dichlorobis(benzonitrile)Palladium(II) with Amino Acids

Abstract

The substitution reactions of the benzonitrile (PhCN) complex cis-[Pd(PhCN)₂C1₂] with the sodium salts of some amino acids, namely L-tyrosine (tyrH), L-phenylalanine (pheH), L-glutamic acid (gluH), L-glutamine (glnH), L-cysteine (cysH), and glycine (glyH) have been investigated. The isolated complexes [Pd(tyr)₂].0.5H₂O, [Pd(phe)₂].H₂O, [Pd(glu)₂], [Pd(gln)₂].H₂O, Na₂[Pd(cys)₂].0.5Me₂CO, and [Pd(gly)₂].0.5H₂O have been characterized by elemental analysis, conductivity measurements, IR, electronic absorption, and ¹H- and ¹³C-NMR spectra. Based on these data, all amino acid anions are found to behave as bidentates through the ‒NH₂ and ‒COO⁻ groups except the cysteinate ion which bonds to Pd(II) through ‒NH₂ and ‒S⁻ groups.

Keywords:

• amino acids
• bis-chelated Pd(II) complexes
• substitution reactions

Notes

^♣ However, both PdCl₂ and tyrosine are insoluble in H₂O.

Additional information

Funding

The authors would like to thank the Deanship of Research at Yarmouk University for partial financial support of this project.