Synthesis, structure, computational studies and magnetic properties of a ten-coordinate gadolinium(III) complex

Synthesis, characterization and antimicrobial activity of pentagonal-bipyramidal isothiocyanato Co(II) and Ni(II) complexes with 2,6-diacetylpyridine bis(trimethylammoniumacetohydrazone)

“…Depending on the reaction conditions and nature of the metal, 2,6-diacetylpyridine dihydrazones are able to coordinate in neutral (scheme 1a) [4][5][6][7][8][9], mono-(schemes 1b and 1c) [10] and doubledeprotonated forms (scheme 1d) [11]. Lanthanide complexes with coordination numbers larger than seven were reported [12][13][14][15][16][17] with one dihydrazone ligand and the remaining coordination sites occupied with monodentate or bidentate ligands [12][13][14][15][16][17]; however, in isostructural complexes of Pr(III) and Sm(III) two ligands are pentadentate N 3 O 2 coordinated to the metal ion [14]. Mono-and binuclear octahedral complexes of Ni(II) with 2,6-diacetylpyridine dihydrazones were reported [18][19][20].…”

“…Formation of stable lanthanide complexes with this type of ligand allows them to be used in MRI as contrast agents [12,13]. Because of interesting structural characteristic of 2,6-diacetylpyridine dihydrazone complexes and opportunities of applications, we have examined the coordination properties of condensation product of 2,6-diacetylpyridine and trimethylammoniumacetohydrazide (Girard's T reagent) and antimicrobial activity of its isothiocyanato Co(II) and Ni(II) complexes.…”

Cytotoxic Activities of Newly Synthesized Co(II), Ni(II) and Cu(II) Complexes with Hexadentate Hydrazonic Ligands

“…Yields refer to analytically pure compounds and were not optimized. 1 H NMR was recorded on Perkin Elmer 283B and 300 MHz Varian XL-300 instruments in DMSO-d 6 as solvent. IR spectra were recorded on a Perkin Elmer (Spectrum 1000) Fouriertransform infrared (FT-IR) spectrometer, using KBr pellets.…”

“…Although acyclic Schiff bases have not been extensively studied but they found to have a flexible cavity size which is considered as an advantage. Some studies [1][2][3][4] regarding pentadentate bis acylhydrazones of 2,6-diacetylpyridine suggests that 2,9-diformylphenanthroline has been widely used as a metal-binding reagent in most aspects of coordination chemistry while some of its derivatives are used as hexadentate ligands [5][6] .…”

Synthesis and characterization of dodecahedral cerium(IV) and gadolinium(III) complexes with a tetradentate Schiff Base

“…Selected crystallographic data are listed in table 1. and gadolinium(III) complexes, respectively having similar coordinating atoms. [32][33][34] In In both complexes, each phenyl ring is twisted along the C−C bond that connects it with the terminal chelate ring. In 1, the dihedral angles formed by the two phenyl ring planes with the mean plane containing the corresponding 5,5,5-membered fused chelate rings span the range 9.…”