Electrochemical synthesis and crystal structure of cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) complexes with 2-pyridinecarbaldehyde-(2′-aminosulfonylbenzoyl)hydrazone

Synthesis, characterization and biological activities of N-heteroaromatic hydrazones and their complexes with Pd(II), Pt(II) and Cd(II)

“…The coordination of azomethine nitrogen can be deduced on the basis of the shift of the band originating from m(C=N) toward higher frequencies in the IR spectra of all of the complexes (1,571 cm -1 in fphaOEt and 1,568 cm -1 in qahaOEt; 1,608 cm -1 , 1,607 cm -1 , 1,604 cm -1 and 1,589 cm -1 in 1-4, respectively) [12,13]. Coordination of carbonyl oxygen to a metal is generally accompanied by a shift of m(C=O) to lower frequencies in the IR spectra of the complexes compared to the spectra of the free ligands [14], but in the complexes 1-4 the opposite trend was observed, which indicates that the carbonyl oxygen atom is not coordinated.…”

“…Hydrazones have been intensively investigated because of their applications as anticancer, antiviral, antibacterial and antifungal agents [12,13]. These compounds display a versatile behavior in metal coordination [1][2][3][4][5][6][7][8][9][10][11][12][13][14], and their biological activity is often increased by bonding to d-metals [14]. Coordination compounds with N-heteraromatic hydrazone ligands, which are the condensation products of dap, ap, qa and fp with ethyl hydrazinoacetate hydrochloride (haOEtÁHCl), were obtained by simple in situ reactions in the presence of metal salts [1,7,9,11].…”

Synthesis, structural characterization and electrochemical recognition of metal ions of two new ferrocenylhydrazone‐based receptors

“…[13 -16] Among these, hydrazone-based receptors have strong binding ability with ions and are readily available. [17] Substituents on the functional group affect the properties of the receptors to some extent. Ferrocene-containing compounds have their own specialties owing to their special sandwich structure.…”

Synthesis, structure, spectroscopic and DFT studies of zinc(II) and manganese(II) complexes of 2-pyridine carboxaldehyde-N-methyl-N-2-pyridyl hydrazone

“…These distances and angles are in accordance with previously reported values for hydrazone containing Zn(II) [33,34] and Mn(II) [35] complexes. The bond distances and angles in the pamph ligand in each structure are in the normal range [33,34,36,37]. The distortion from TBP geometry and the extent of distortion could be a consequence of the connectivity of the metal, although crystal packing forces are an obvious candidate for the cause of such a distortion in the geometries.…”