Synthesis and characterization of novel M(II) (M = Mn(II), Ni(II), Cu(II) or Zn(II)) complexes with tridentate N2,O-donor ligand (E)-2-amino-N’-[1-(pyridin-2-yl)- ethylidene]benzohydrazide

Abstract

The coordination chemistry towards the M(II) metal centre (M = Mn, Ni, Cu or Zn) of the hydrazone ligand (E)-2-amino-N'-[1-(pyridin-2-yl)ethylidene]benzohydrazide (H3L) has been explored and complexes having formulae [Mn(H2L)2] (1), {[Ni(H2L)2]. DMF. 0.4H2O} (2), {[Cu2(H2L)2(µ-Cl)2]. DMF} (3) and [Zn(H2L)2] (4) have been isolated and characterized by IR, UV-Visible spectroscopy, elemental analysis and Xray crystal diffraction. Structural studies reveal that the mononuclear complexes (1), (2) and (4) adopt highly distorted octahedral geometries while the dinuclear complex (3) adopts a square pyramidal geometry around each copper(II) ion.

A microporous metal–organic framework with open metal sites for selective sensing Fe3+, CrO42- and nitrobenzene

“…Moreover, 1 has five potential sensing sites and its sensing properties were not explored at all. Our group has also reported several interesting solventinduced MOFs in recent works [15][16][17][18][19], and the results indicate that sensing feature are mainly controlled by solvent size and polarity, however, the mechanisms of solvent effects are still largely unexplored. Consequently, much research work in this area remains to be done [20].…”

Crystal structure of the mixed methanol and ethanol solvate of bis{3,4,5-trimethoxy-N′-[1-(pyridin-2-yl)ethylidene]benzohydrazidato}zinc(II)

“…1). The average bond lengths (3) Å and Zn-O = 2.141 (2) Å ] are typical for such Zn II complexes (Jang et al, 2005;Barbazá n et al, 2007;Singh et al, 2015;Kane et al, 2016;Wang et al, 2019). The N2-Zn-N5 angle, formed by the ketimine N atoms of the two ligand molecules, is 164.81 (10) , showing the deviation of the coordination polyhedron from an ideal octahedral geometry.…”

Synthesis, structure determination and characterization by UV–Vis and IR spectroscopy of bis(diisopropylammonium) cis-dichloridobis(oxalato-κ2 O 1,O 2)stannate(IV)

“…Thus, this strong absorption band at 320 nm (Fig. 5) may be assigned to ligand-metal ion charge transfer (LMCT) (Kane et al, 2016). However, as the ligandbased !…”