Five new bis(3-hydroxy-4-pyridinone) tetradentate chelators were synthesized in this study. The structures of these tetradentate chelators were characterized by ¹H-NMR, (13)C-NMR, FT-IR, UV-vis, and mass spectral analyses. The binding abilities of these tetradentate chelators for uranyl ion at pH 7.4 were also determined by UV spectrophotometry in aqueous media. Results showed that the efficien...

A preorganized tetradentate phenanthroline-derived amide ligand, N,N'-diethyl-N,N'-ditolyl-2,9-dicarboxamide-1,10-phenanthroline (Et-Tol-DAPhen), was found to show high selectivity towards small copper ions, which might be due to the change of the coordination mechanism from tetradentate to terdentate mode.

metal complexes, ml (m=ni, cu, co and zn) of unsymmetrical tetradentate schiff base have been synthesized by the template reaction of the half-units n-(1-hydroxy-2-acetonaphthone)-1-amino-2-phenyleneimine)(hl1) with 2-pyrroleca-rbaldehyde. the complexes have been characterized by elemental analysis, ir, 1h nmr and uv spectroscopy. the crystal structure of the ni(ii) complex has been determine...

Pentacoordinated copper(II) complexes were synthesized from tetradentate ligand N,N-bis (2-methyl-N-methylbenzimidazolyl)hexanediamide. Characterization has been done on the basis of elemental analysis, electronic spectra, IR studies, conductance data, magnetic properties, EPR and x-ray studies for the complexes. From analytical data, the stoichiometry of the complexes has been found to be 1:1 ...

An unprecedented combination of porous SWCNHs with tetradentate polypyridine cobalt( ii ) complexes bearing pyrene groups has been realized to produce a hybrid cathode active for the hydrogen evolution reaction (HER) in water at neutral pH.

The Schiff base complexes of Pb(II) and Sn(II) with bidentate (NO), [M(sal-An)2] (sal-An = aniline salicylideneiminato); tridentate (ONO), [M(sal-OAP)H2O)] (sal-OAP = orthoaminophenol salicylideneiminato); and tetradentate (N2O2), [M(sal-o-phdn)] (sal-o-phdn = N,N'-ophenylene bis(salicylideneiminato) have been synthesized. The infrared spectra were recorded and full assignments of all observed ...

The crystal structure of the title compound, [Ni(C8H20N4)(C12H8N2)](ClO4)2, has been determined by X-ray diffraction. The Ni(II) ion is six coordinated with four nitrogen atoms of the tetradentate macrocyclic ligand and two nitrogen atoms of the bidentate ligand in a distorted octahedron geometry. The folded tetradentate macrocyclic ligand adopts a configuration having four five-membered chelat...

the coupling of tetrazotised 1,8-diaminonaphthalene with 1,3-dicarbonyl compounds [acetylacetone,methylacetoacetate and acetoacetanilide] yielded a new series of tetradentate ligand systems. analytical, ir,1h nmr and mass spectral data indicate that the compounds exist in the intramolecularly hydrogen bondeddihydrazone form. dibasic tetradentate n2o2 coordination of these compounds in their [ml...

CPL active enantiopure zinc(ii) complexes based on the first tetradentate salen ligands surrounded by [4]helicene moieties and chiral 1,2-cyclohexane-diamine are reported.

Rare examples of tetrapalladated derivatives in which two flat tetradentate bridging ligands are perfectly face-to-face as a result of a remarkable ancillary ligand effect are reported.