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Diammin‐dihydroxo‐palladium(II), ein neues Agens für die Komplexierung von Kohlenhydraten
Author(s) -
Kästele Xaver,
Klüfers Peter,
Kunte Thomas
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200109)627:9<2042::aid-zaac2042>3.0.co;2-2
Subject(s) - chemistry , palladium , alkoxide , steric effects , deprotonation , ethylenediamine , nuclear magnetic resonance spectroscopy , stereochemistry , metal , coordination complex , polymer chemistry , medicinal chemistry , organic chemistry , catalysis , ion
Polyol Metal Complexes. 38. Diammine Dihydroxo Palladium(II), a New Agent for Carbohydrate Coordination [(NH 3 ) 2 Pd II (OH) 2 ] reacts with the diol functions of erythritol. The solution equilibrium was analyzed by means of 13 C NMR spectroscopy. The main species in Pd‐rich solutions is the doubly metallated complex, which has been isolated in the form of yellow crystals of the formula [{(NH 3 ) 2 Pd II } 2 (μ‐ErytH –4 )] · 2 H 2 O ( 1 ). As minor solution species, monometallated complexes with 1,2‐ErytH –2 and 2,3‐ErytH –2 ligands were detected. Compared with the ethylenediamine analogue, [(NH 3 ) 2 Pd II (OH) 2 ] is a remarkably bad cellulose solvent despite its good coordinating ability. Extensive hydrogen bonding, which may not be expected for en ligands for steric reasons, from the ammine ligands to the deprotonated alkoxide functions – resulting in lateral aggregation of the polysaccharide chains – seems to be the molecular origin of this phenomenon.