In:
Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 53, No. 5-6 ( 1998-6-1), p. 581-586
Abstract:
Crown ether complexed pentachloro(aqua)platinic acid, (H 3 O)[PtCl 5 (H 2 O)]·2(18-cr-6)·6H 2 O (1) reacts with glycine, L-alanine, and DL-2-aminobutyric acid to give cis-[PtCl 4 (O-glyH)(H 2 O)]·(18-cr-6)·H 2 O (4a) 1 and cis-[PtCl 4 (O-amacH)(H 2 O)]·(18-cr-6) (amacH = alaH 4b, abuH 4c), respectively, as well as (amacH 2 ) 2 [PtCl 6 ]·2(18-cr-6) (amacH = glyH 5a, alaH 5b, abuH 5c). The crown ether complexed hexachloroplatinic acid, (H 3 O) 2[PtCl 6 ]·2(18-cr-6) (2), reacts with glycine to afford (glyH 2 )[PtCl 4 (N,O-gly)]·2(18-cr-6)·1.25H 2 O (6). The structures of 4b and 6 were determined by X-ray diffraction. The alanine ligand in 4b is a zwitterion that is coordinated to platinum by one oxygen atom of the carboxylate group only. The other oxygen atom is engaged in a strong hydrogen bond to the ds-coordinated aqua ligand. The glycinato ligand in 6 is N, O-coordinated at platinum forming an anion [PtCl 4 (N,O-gly)] - . The other oxygen atom of the carboxylate group is involved in a strong hydrogen bridge to the cation (glyH 2 ) + . In both complexes hydrogen bridges are formed between the -N + H 3 and -NH 2 groups of the amino acid ligands and the oxygen atoms of the crown ether molecules.
Type of Medium:
Online Resource
ISSN:
1865-7117
,
0932-0776
DOI:
10.1515/znb-1998-5-616
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
1998
detail.hit.zdb_id:
2078109-X
detail.hit.zdb_id:
124635-5
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