Synthesis, spectral characterization, properties and structures of copper(I) complexes containing novel bidentate iminopyridine ligands

• Published in: Polyhedron Vol. 26; no. 1; pp. 154 - 162
• Main Authors: Dehghanpour, Saeed, Bouslimani, Nouri, Welter, Richard, Mojahed, Fresia
• Format: Journal Article
• Language: English
• Published: OXFORD Elsevier Ltd 01.01.2007; Elsevier
• Subjects: 2-Pyridinecarbaldehyde; Chemistry; Chemistry, Inorganic & Nuclear; Copper(I) complexes; Crystallography; Diimine ligands; Distorted tetrahedral structure; Physical Sciences; Science & Technology; Distorted tetrahedral structure; 2-Pyridinecarbaldehyde; Diimine ligands; Copper(I) complexes; copper(I) complexes; ELECTRON; CHARGE-TRANSFER ABSORPTION; CRYSTAL-STRUCTURES; diimine ligands; EXCITED-STATES; NMR; distorted tetrahedral structure; DNA; 2-pyridinecarbaidehyde; SYSTEMS; ENERGY-TRANSFER; EMISSION; PHENANTHROLINES
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2006.08.011

The copper(I) complexes [Cu(LL) 2]ClO 4 Cu(LL)(PPh 3) 2]ClO 4, where LL is iminopyridine derivatives, have been synthesized and characterized by CHN analyses, 1H, 13C-NMR, IR, and UV–Vis spectroscopy. The crystal structures of some complexes have been determined. The redox behavior of the complexes has been studied. Four new ligands, (4-methyl-phenyl)-pyridin-2-ylmethylene-amine (A), (2,3-dimethyl-phenyl)-pyridin-2-ylmethylene-amine (B), (2,4-dimethyl-phenyl)-pyridin-2-ylmethylene-amine (C) and (2,5-dimethyl-phenyl)-pyridin-2-ylmethylene-amine (D), and their corresponding copper(I) complexes, [Cu(A) 2]ClO 4 ( 1a), [Cu(B) 2]ClO 4 ( 1b), [Cu(C) 2]ClO 4 ( 1c), [Cu(D) 2]ClO 4 ( 1d), [Cu(A)(PPh 3) 2]ClO 4 ( 2a), [Cu(B)(PPh 3) 2]ClO 4 ( 2b), [Cu(C)(PPh 3) 2]ClO 4 ( 2c) and [Cu(D)(PPh 3) 2]ClO 4 ( 2d), have been synthesized and characterized by CHN analyses, 1H and 13C NMR, IR and UV–Vis spectroscopy. The crystal structures of [Cu(B) 2]ClO 4 ( 1b), [Cu(C) 2]ClO 4 ( 1c) and [Cu(A)(PPh 3) 2]ClO 4 · 1/2CH 3CN ( 2a) were determined from single crystal X-ray diffraction. The coordination polyhedron about the copper(I) center in the three complexes is best described as a distorted tetrahedron. A quasireversible redox behavior is observed for the complexes.