Pyridylmethylthiourea derivatives coordinate with [(en)2Co(OSO 2CF3)2]+ in a tridentate manner resulting in the formation of a hypodentate ethylenediamine ligand. Four ligands were studied: N-(R)phenyl-N′-2-pyridylmethylthiourea (R≤H (1a), CH 3 (1b), OCH3 (1c)) and N-benzyl-N′-2- pyridylmethylthiourea (2). These bind through the sulfur, a deprotonated exo nitrogen, and the pyridyl nitrogen atoms forming four and five-membered rings, respectively. The ligand also coordinates in a bidentate manner through the sulfur and deprotonated endo or exo nitrogen atoms, forming two additional coordination isomers. The solid state structure (X-ray) of one of the bidentate isomers of Co-1b2+ (endo isomer) shows that the coordinated thiourea sulfur induces a structural trans effect of 0.035Å on the trans Co-N bond while that of the tridentate isomer of Co-1a3+ confirms the coordination mode of the ligand and the presence of a protonated hypodentate ethylenediamine ligand as suggested by 1H and 13C NMR spectroscopy.
|Number of pages||11|
|Journal||Australian Journal of Chemistry|
|State||Published - 2014|
Bibliographical noteFunding Information:
Funding for the Thermo Finnigan LCQ Deca Max was through NSF Grant 0421581 to Matthew Saderholm at Berea College. The authors thank Emily Fletcher and Say Lee Teh for obtaining the mass spectrometry data. Initial funding for this work was provided by the Appalachian College Association, Berea, KY. JK thanks Dr Alan Pinkerton (Department of Chemistry, University of Toledo, Toledo, OH 43606 USA) for the use of the SMART 6000 diffractometer.
ASJC Scopus subject areas
- Chemistry (all)