The crystal and molecular structure of bis(L-serinato)palladium(II)

Abstract

Pd(CaH6NO3)2, C6HI2N206Pd , is orthorhombic, space group P2~2~2~, with a = 8.828 (8), b = 9.705 (9), c = 11.315 (7) A, Z = 4. The structure was refined to R = 0.054 for 1763 photographic intensities. The two amino acid molecules are bonded in an irregular cis square-planar arrangement about the Pd atom [average Pd-N 2.023 (7), average Pd-O 2.005 (7) /~,]. One five-membered chelate ring is almost planar whereas the other is distorted. The two serine molecules have different conformations for the hydroxyl groups, one having a gauche-gauche and the other a gauche-anti conformation. The structure is stabilized by intermolecular hydrogen bonds in which all active protons are involved.

[(R,S)-N,N'-Ethylenebis(serinato)]copper(II) monohydrate

“…0(3) has a gauche-gauche configuration relative to these two groups; 0(6) adopts a gauche-anti configuration. This feature was also observed in [Pd(L-ser) 2] (Vagg, 1979).…”

Crystal structure of poly[[μ3-(S)-2-amino-3-hydroxypropanoato]-cis-di-μ-chlorido-caesiumpalladium(II)]

“…The same behaviour was observed in the structure of barium dichloro(glycinato) palladium(II)Á2H 2 O (Baidina et al, 1980a). The five membered ring Pd1-O1-C1-C2-N1 is planar with the hydroxymethyl substituent in a gauche-gauche orientation that is very similar with the conformation of one of the ligands in the structure of bis(l-serinato) palladium(II) (Vagg, 1979).…”

“…The X-ray crystal structure of potassium-l-alaninato-dichloroplatinate(II) has been published (Schiesser et al, 2012). Two complexes of l-serine with palladium(II), bis(l-serinato) palladium(II) and caesium cis-dichloro-l-serinato palladium(II), were synthesized (Charlson et al, 1981) and an X-ray crystal structure determination of bis (l-serinato) palladium(II) has been performed (Vagg, 1979). Previously it was shown that caesium cis-dichloro-l-serinato palladium(II) produced filamentous growth in Escherichia coli (E.coli) bacteria (Charlson et al, 1981), markedly modified the interior of E.coli bacteria cells (McArdle et al, 1984), increased the lifespan of solid murine tumors Ca-755 and RShM-5 (Treschalina et al, 1994) and had radio-modifying properties (Treshalina et al, 1995).…”

Compounds of Amino Acids as Anions

“…As said above, there is another pair of isotypic serinate salts (as can be guessed from the unit cell parameters; see Table 3.5), namely, cis-bis(L-serinato)-platinum and cis-bis(L-serinato)-palladium (Watanabe et al 2003;Vagg 1979), which correspond structurally to cis-bis(glycinato)-platinum.…”