Synthesis, Spectroscopic and Electrochemical Studies of Mononuclear Fe(II) and Ni(II) Complexes Containing a Macrocyclic Ligand Derived from Pyridine-2,6-dicarboxaldehyde and 1,2-Bis(2-aminoethoxy) Ethane

Abstract

The cyclic (2+2) template condensation of 2,6-pyridinedicarboxaldehyde with 1,2-bis(2-aminoethoxy) ethane using Pb(SCN) 2 as the metal source gave dinuclear lead(II) complex, Pb 2 L 1 (SCN) 4 (1), where L 1 is tetra-Schiff-base macrocycle. The transmetallation treatment of 1 with suitable metal perchlorate yield [FeL 1 ](ClO 4 ) 2 (2) and [NiL 1 ](ClO 4 ) 2 (3). The complexes (2 & 3) have been characterized by elemental analyses, IR, UV-visible, and ESI-MS spectroscopy. Based on spectral data, octahedral geometry may be proposed for these complexes. The electrochemical behavior of iron and nickel complexes is reported.

Synthesis, characterization and biological relevance of some metal (II) complexes with oxygen, nitrogen and oxygen (ONO) donor Schiff base ligand derived from thiazole and 2-hydroxy-1-naphthaldehyde

“…The 1 H NMR spectra of Schiff base ligand (L) and its Zn(II) complex were recorded in d 6 -DMSO and data are depicted in Table 2 [29]. Thus, the 1 H NMR spectral data supports the IR spectral inferences and complexation of Zn(II) ion with Schiff base ligand (L).…”

Pd(II) complexes of Schiff bases and their application as catalysts in Mizoroki–Heck and Suzuki–Miyaura cross‐coupling reactions

“…These signals are assigned to C HN resonances. The shifting of 13 C NMR spectra occurring after complexation proves that Pd(II) coordinates to the ligands via nitrogen atoms . The 1 H NMR spectra of ligands and their Pd(II) complexes 1 , 2 , 1a and 2a show signals at 2.50–3.86 ppm, corresponding to aliphatic C H 3 protons.…”

Synthesis and Characterization of a Thiocyanate Bridged Dinuclear Cu(II) Complex Containing Macrocyclic Ligand Derived from Pyridine-2, 6-dicarboxaldehyde and 1, 2-bis(2-aminoethoxy) Ethane

“…The positive-ion ESI-mass spectrum of complexes was obtained with a Quatttro micro API spectrometer manufactured by Waters. X-ray measurement was performed on a Rigaku Saturn CCD area detector at Li was first prepared by condensation pyridine-216-discardox aldehyde with 1,2-bis(2-amino ethony) ethane which was subsequentcy treated with Pb (SCN) 2 to yield pb 2 Li (SCN) 4 by the method as reparted in the literature (Alam et al 2011). Pyridine-2,6-dicarboxaldehyde and Pb 2 L 1 (SCN) 4 were prepared by method reported by Alam et al (2011).. All measurements were performed at room temperature (25 ± 2 °C).…”

“…X-ray measurement was performed on a Rigaku Saturn CCD area detector at Li was first prepared by condensation pyridine-216-discardox aldehyde with 1,2-bis(2-amino ethony) ethane which was subsequentcy treated with Pb (SCN) 2 to yield pb 2 Li (SCN) 4 by the method as reparted in the literature (Alam et al 2011). Pyridine-2,6-dicarboxaldehyde and Pb 2 L 1 (SCN) 4 were prepared by method reported by Alam et al (2011).. All measurements were performed at room temperature (25 ± 2 °C). Crystal structure determination: The block type crystals of complex, [Cu 2 L 1 (SCN) 3 (ClO 4 )] are so stable in air that the single crystal was mounted in a capillary without coating.…”