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Flat vs. Folded Chelate Rings in cis‐ Pt II a 2 (a = NH 3 , a 2 = en, a 2 = 2, 2′‐bpy) Complexes of Twofold Substituted Diazine Ligands
Author(s) -
von Grebe Philipp,
Sanz Miguel Pablo J.,
Lippert Bernhard
Publication year - 2012
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/zaac.201200306
Subject(s) - pyrazine , platinum , pyridine , chelation , chemistry , pyrimidine , ligand (biochemistry) , dicarboxylic acid , stereochemistry , crystallography , medicinal chemistry , polymer chemistry , inorganic chemistry , organic chemistry , receptor , biochemistry , catalysis
Acid‐base and ligating properties of three bis(substituted)pyrazine (pz) and pyrimidine (pym) ligands (pyrazine‐2, 5‐dicarboxylic acid, 2, 5‐pzdcH2, 2, 3‐bis(pyridine‐2‐yl)pyrazine, 2, 3‐bppz, pyrimidine‐4, 6‐dicarboxylic acid, 4, 6‐pmdcH 2 ) toward cis ‐Pt II a 2 (a = NH 3 , a 2 = en, a 2 = 2, 2′‐bpy) have been studied. Combinations of pz‐N/pym‐N with donor atoms of the substituents lead to 5‐membered platinum chelates, but exclusive N, N‐coordination through the pyridyl substituents of 2, 3‐bppz can lead to a 7‐membered platinum chelate with a characteristic L‐shape of the resulting cation. It is observed for Pt II (2, 2′‐bpy), yet not for Pt II (en), and is a consequence of differences in sterical interactions between the 2, 3‐bppz ligand and the coligands of Pt II .