Synthesis, Characterization, and Structural Assessment of Ni(II) Complexes Derived from Bis(2-hydroxy-1-naphthaldehyde)succinoyldihydrazone

Abstract

The monometallic nickel(II) complexes [Ni(H2nsh)(A)2]·nH2O (where A = water (H2O), n=0 (1); pyridine (py), n=2 (2); 2-picoline(2-pic), n=0 (3); 3-picoline(3-pic), n=2 (4); and 4-picoline(4-pic), n=0 (5)) and homobimetallic nickel(II) complexes [Ni2(nsh)(A)4]·nH2O (where A = water (H2O), n=1 (6); pyridine (py), n=4 (7); 2-picoline(2-pic), n=4 (8); 3-picoline(3-pic), n=4 (9); and 4-picoline(4-pic), n=4 (10), resp.) have been synthesized in methanol from bis(2-hydroxy-1-naphthaldehyde)succinoyldihydrazone (H4nsh). The complexes have been characterized by elemental analyses, molar conductance, magnetic moment, and electronic and IR and TGA/DTA spectroscopic studies. The monometallic complexes (1) to (5) are found to have octahedral stereochemistry while complexes (6) to (10) are found to have distorted octahedral stereochemistry in which one of the Ni(II) centres is present in N2O2 coordination sphere and another Ni(II) centre is bonded to it through phenolate oxygen atoms via oxo-bridging.

Synthesis and Characterization of Bioactive Cadmium (II) Complexes Derived from 4-Benzyloxybenzoylhydrazine with Different Aromatic Aldehydes

“…Moreover, the ligands showed absorption maxima in the range of 300-370 nm which ascribed to (n→π * ) transition for the loan pair of electrons on the hetero atom of (>C=O) and (-N=CH-) moieties. During formation of the complexes, the (π→π * ) transition shifted slightly towards longer wave length, whereas the (n→π * ) transition of (>C=O) and (-N=CH-) largely shifted to the longer wave lengths, suggesting the chelation of the ligands to the metal center [18]. The complexes did not show any d-d electronic transition due to completely filled d 10 electronic configuration of cadmium ion [19].…”

Amine-substituent induced highly selective and rapid “turn-on” detection of carcinogenic 1,4-dioxane from purely aqueous and vapour phase with novel post-synthetically modified d10-MOFs

“…Initially, the UV-vis analysis of Cd-MOF 1 showed the highest absorption (λ max ) at 323 nm, possibly due to the n-π* or π-π* transitions in the 'strut' ATA (Fig. S12 †) 40,41 After post-synthetic modifications, a bathochromic shift (∼10 nm, Fig. S12 †) was observed in the absorption band owing to N-functionalization with the incorporation of conjugated aromatic entities in the MOF skeleton.…”

Schiff Bases Derived from 2-Hydroxynaphthalene-1-carbaldehyde and their Metal Complexes

“…The coordination number of these compounds was either six or nine relying upon the anionic ligand [62]. Chakrabarty et al [63] investigated the synthesis and characterization of some nickel complexes as mono and homo dimetallic derived from bis(2-hydroxynaphthalene-1-carbaldehyde)succinoyldihydrazone (Fig. 15).They observed that the complexes with mono nickel have octahedral geometry while complexes with bi-nickels have deformed octahedral geometry in which one of the nickel lopes is available in N2O2 coordination circle and another nickel focus is bind to it through oxygen of phenolate.…”