Syntheses and structures of mononuclear and binuclear transition metal complexes (Cu, Zn, Ni) with (salicylideneglycine and imidazole)

Abstract

2008) Syntheses and structures of mononuclear and binuclear transition metal complexes (Cu, Zn, Ni) with (salicylideneglycine and imidazole), Journal of Coordination Chemistry, 61:5, 715-730, Four transition metal (Cu(II), Zn(II) and Ni(II)) complexes with a Schiff-base ligand (salicylideneglycine) have been synthesized. All complexes have been characterized by elemental analysis, IR spectra and UV-vis spectroscopy. Single-crystal analyses were performed with (Á CH 3 OH Á 0.5H 2 O (4) and fluorescence spectra and thermogravimetric analyses were also carried out. Structural analyses show that 1, 2 and 4 have similar coordinated modes with the tridentate amino-Schiff-base ligand, but differ from the binuclear nickel complex 3. The tridentate amino-Schiff-base ligand contains aliphatic nitrogen, phenoxy, and carboxylic oxygen as three donor atoms. In addition, inter-and intra-molecular hydrogen bonds are also discussed.

Synthesis, structure and superoxide dismutase activity of two self-assembly transition metal complexes containing a tridentate amino-Schiff base deviating from salicylaldehyde with glycine

“…The Ni center lies in the N1−N2−N4−N6 coordination plane. The average deviated distance of N1, N2, N4 and N6 from the coordination plane is 0.0000 (2) Compared with (C 9 H 7 NO 3 )Ni(C 3 H 4 N 2 ) 2 (C 4 H 5 N 2 O) CH 3 OH0.5H 2 O [20] , the corresponding lengths of M− Figure 3 The molecular structure of complex 2. Table 3 The selected bond lengths (Å) and angles () for complex 2…”

Framework Materials Based on Naphthalenediimide Derivatives Supported by Aromatic Carboxylic Acids for Application as Multifunctional Fluorescence Sensors

“…In addition, we also explored the In order to explore the active site of the interaction between complexes 1-3 and guest molecules, we compared the molecular structures of the nine amino acids (Figure 8) and found that L-Arginine contains a unique C=N bond, which may be the reason for the fluorescence quenching of complexes 1-3 towards L-Arginine. Therefore, to confirm point, a small molecule compound with C=N (potassium salt of salicylideneglycine) was designed and synthesized according to the reported reference, [55] and it was prepared into an aqueous solution of 10 À 2 mol/L, and fluorescence detection of the complex 3 was performed on it. Through experiments, it was found that 3 towards potassium salt of salicylideneglycine exhibited fluorescence quenching, which also confirmed that the fluorescence quenching may be due to the existence of C=N bond (Figure 11a).…”