کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1305674 | 1499174 | 2014 | 7 صفحه PDF | دانلود رایگان |
• X-ray crystal structures of four complexes proved the orientation of the ligands.
• Only mononuclear bis- and tris-chelates complexes were obtained.
• Tautomerization resulted keto-thiol form of the ligands for metal ion binding.
Bis- and tris-chelates (1–5) of Ni(II), Cu(II), Fe(III) and Co(II) with two O,S donor substituted benzoylthiourea based ligands 3,3-diethyl-1-benzoylthiourea (HL1) and 3-methyl-3-phenyl-1-benzoylthiourea (HL2) have been synthesized and structurally characterized by X-ray crystallography. The keto-thione form of the free ligands transform to the keto-thiol form during coordination through neutral O and anionic S atoms. Crystallographic characterizations with supportive spectroscopic signatures confirm the cis-conformation in bis-chelates and facial binding to the tris-chelates.
Benzoylthiourea based O,S donor ligands showed preference for cis- and fac-isomers for bis- and tris-chelates of 3d metal ions with keto-imine-thiol tautomerization.Figure optionsDownload as PowerPoint slide
Journal: Inorganica Chimica Acta - Volume 414, 1 April 2014, Pages 127–133