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Novel dinuclear palladium(II) complexes with the chelating ligand bis(1‐methylimidazol‐2‐yl) ketone (bmik) and pyridine‐2‐thiolate, pyrimidine‐2‐thiolate, and 1‐methylimidazole‐2‐thiolate as bridging secondary ligands
Author(s) -
Engelking Holger,
Karentzopoulos Stefan,
Reusmann Gerhard,
Krebs Bernt
Publication year - 1994
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19941271203
Subject(s) - chemistry , palladium , pyridine , ketone , chelation , ligand (biochemistry) , pyrimidine , medicinal chemistry , imidazole , stereochemistry , bridging ligand , metal , crystal structure , polymer chemistry , crystallography , inorganic chemistry , organic chemistry , catalysis , biochemistry , receptor
Abstract Three novel dinuclear palladium(II) complexes with the chelating ligand bis(1‐methylimidazol‐2‐yl) ketone (bmik) as well as pyridine‐2‐thiolate (pyt), pyrimidine‐2‐thiolate (pymt), and 1‐methylimidazole‐2‐thiolate (meimt) as bridging secondary ligands were prepared by reactions of diaqua[bis(1‐methylimidazol‐2‐yl) ketone]palladium(II) nitrate with the ligands in aqueous solution. The thiolates bridge the two metal atoms in the μ‐ N,S mode. The structures of the following compounds were analyzed by single crystal X‐ray diffraction: Bis(μ‐pyridine‐2‐thiolato‐ N,S )‐bis{[bis(1‐methyl‐imidazol‐2‐yl) ketone]palladium(II)}nitrate [Pd 2 (bmik) 2 ‐(pyt) 2 ](NO 3 ) 2 · 5 H 2 O ( 1 ), bis(μ‐pyrimidine‐2‐thiolato‐ N 1 ,S )‐ bis{[bis(1‐methylimidazol‐2‐yl) ketone]palladium(II)} nitrate [Pd 2 (bmik) 2 (pymt) 2 ](NO 3 ) 2 · 5 H 2 O ( 2 ), and bis(μ‐1‐methyl‐imidazole‐2‐thiolato‐ N 3 ,S )‐bis{[bis(1‐methylimidazol‐2‐yl) ketone]palladium(II)} nitrate [Pd 2 (bmik) 2 (meimt) 2 ](NO 3 ) 2 · 4.5 H 2 O ( 3 ). In the cases of 1 and 3 the bridging thiolate ligands show head‐to‐head orientation. For complex 2 a head‐to‐tail orientation of the pyrimidine‐2‐thiolates was found. The metal‐metal distances vary from 2.963 Å in complex 3 and 2.915 Å in 1 to the shortest of 2.886 Á in 2 . In addition to the X‐ray crystallography the three compounds were characterized by 1 H‐NMR and IR spectroscopy.