Note. Preparation of 11-(2′-dimethylaminoethyl)-1,4,7-trimethyl-1,4,7,11-tetra-azacyclotetradecane, and characterisation of its nickel(II), copper(II), and zinc(II) complexes

Heptacoordinate Tin(IV) Compounds Derived from Pyridine Schiff Bases: Synthesis, Characterization, in Vitro Cytotoxicity, Anti-inflammatory and Antioxidant Activity

“…The 2,6-pyridinedicarboxaldehyde was prepared according to the literature procedure. 46) 1 H-NMR, 13 C-and 13 C-CPMAS NMR spectra were recorded on a JEOL Eclipse ϩ300 and Varian (75.4 MHz) spectrometers, respectively. Chemical shifts (ppm) are relative to (CH 3 ) 4 Si, coupling constants are quoted in Hz.…”

Structure of a binuclear nickel(II) complex of a pyridine-containing tetraaza macrocycle, including a tetradentate oxalato bridge, [(L)Ni(μ-ox)Ni(L)](ClO4)2

“…The geometry at each Ni is octahedral, with cis-oxygen atoms. This gives a relatively unusual folded macrocycle; this ligand more often takes up the apex and three basal positions of a square pyramid (Alcock, Moore & Omar, 1987). Indeed, it is evident from the trans angle [N(2)-Ni-N(4)] of only 158.2 (3) ° that the ligand is unable to accommodate the present geometry entirely satisfactorily.…”

“…The paramagnetic five-coordinate nickel(II) complexes were found to have square-pyramidal geometries, as shown by crystal structures with X= C1 and dimethyl sulfoxide; X is coordinated in the basal plane in a trans position to the pyridine N atom, and with N 7 at the apex (Alcock, Moore & Omar, 1987). The six-coordinate oxalato complex was assigned a folded cis structure, based on an elemental analysis, spectroscopic data, and by comparison with related structures.…”

SYNTHESIS AND CHARACERISATION OF NOVEL PENTADENTATE LIGAND TYPE N2S2O 4-METHYL-2,6- BIS[4-METHYL THIOSEMICARBAZONYLIDEN]- PHENOL AND THEIR COMPLEXES WITH Ni+2 , Pd+2 , Cu+2 , Zn+2 , Cd+2 and Hg+2

“…The UV-Vis spectrum of [Ni (H 2 L)Cl] shows anew absorption peak at (390)nm due to (d-d) electronic transition type ( 3 A 2 g → 3 T 1 g (p) suggesting octahedral geometry about Ni(II) (16,17) . The new absorption peak at (18,19,20) ( 21) . The UV-Vis spectra of Zn(II), Cd(II)and Hg(II) complexes show no absorption peak at range (380-1000)nm that is indicates no(d-d) electronic transition happened (d 10 -system ) in visible region, that is a good result for Zn(II), Cd(II) and Hg(II) tetrahedral complexes (22,23) .…”