Thermal Dehydrogenation of Oxovanadium(IV) Complexes with Schiff Base Ligands Derived from meso-1,2-Diphenyl-1,2-ethanediamine in the Solid State

Abstract

Schiff base−oxovanadium(IV) complexes, [VO(Xsal-meso-stien)] (X = 3-EtO, 5-MeO, 5-Br) were dehydrogenated upon heating at 210 °C for 3−15 h in the solid state in the air to form [VO(Xsalton)], which have a CC double bond in the five-membered chelate ring moiety. The structures of [VO(3-EtOsal-meso-stien)] and [VO(3-EtOsalton)] were determined by X-ray structure analyses. The benzylic carbon atoms of the N−N chelate ring of [VO(Xsal-meso-stien)] will be oxidized by oxygen in the air to form a double bond.

Mechanochemical Reaction of Polymeric Oxovanadium(IV) Complexes with Schiff Base Ligands Derived from 5-Nitrosalicylaldehyde and Diamines

“…[VO(5-NO sal-meso-stien)] ' 0.5H O (2) was prepared by the literature method (6). Oxovanadium(IV) complexes with Schi!…”

“…(Fig. 1), form linear chain structures in the solid state (5,6). The IR spectra of these complexes in Nujol mulls showed a strong V " O stretching band at 875 cm\ for 1 and 905 cm\ for 2.…”

Synthesis, characterization, spectroscopic and crystallographic investigation of Cobalt(III) schiff base complex with two perpendicular diamine coumarin ligands

“…In the past decade, Schiff bases have received much attention, mainly because of their extensive applications in the synthesis of coordination compounds and catalysis [13][14][15][16][17]. This is due to the fact that Schiff bases offer opportunities for inducing substrate chirality, tuning factors of metal centered electronic and improve the solubility and stability of homogeneous or heterogeneous catalysts, i.e.…”

Synthesis and characterization of copper(II), cobalt(II), nickel(II), and iron(III) complexes with two diamine Schiff bases and catalytic reactivity of a chiral diamine cobalt(II) complex

“…The nickel(II) complexes [L 1 Ni]Á3H 2 O and [L 2 Ni]ÁH 2 O show two shoulders in the ranges 539-542 nm and 440-442 nm, which are characteristic of square planar diamagnetic Ni(II) complexes [31], and resemble the absorption bands observed in the spectrum of an analogous Ni(II) complex reported by Bouwman [46]. A third band which is expected to appear at a higher energy is apparently hidden under the charge transfer band.…”

“…In the last decade, Schiff bases have received much attention, mainly because of their extensive application in the field of synthesis and catalysis [1,2]. Their complexes have also been amongst the most widely studied coordination compounds in the past few years [3][4][5].…”