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Showing papers on "Schiff base published in 1971"



Journal ArticleDOI
TL;DR: In this paper, the pyridine-2-aldehyde Schiff base S-methyl-N-(2-pyridyl)methylendithiocarbazate, C5H4NCHNN-C(SMe)SH (N-N-SH), forms the square-planar 1:1 complexes [M(N(N))X] (M = Ni, Pd, Pt, Cu; X = Cl, Br, I, NCS, or NO3) and the octahedral 2:

84 citations




Journal ArticleDOI
TL;DR: Titanium(IV) complexes have been prepared with some aromatic Schiff bases and the analytical data show that these are either 1 : 2 or 1 : 1 complexes depending on the nature of the Schiff base.

47 citations


Journal ArticleDOI
TL;DR: In this paper, a series of Schiff base complexes of tin(IV), R2SnCl2·ligand (R = CH3, C2H5, n-C3H7, and N-C4H9) has been prepared.

45 citations





Journal ArticleDOI
TL;DR: Diorganotin(IV) dichlorides from 1/1 complexes with the potentially quadridentate Schiff base ligand, bis(acetylacetone)ethylenediimine(H 2 Acacen) have been shown to occupy a tras -R 2 SnX 4 octahedral configuration; conductivity measurements in nitrobenzene show that the species in solution are non-ionic and NMR spectra suggest that the adducts are largely dissociated, even in noncoordinating solvents as mentioned in this paper.

25 citations



Journal ArticleDOI
TL;DR: Evidence is presented which suggests that the 330 nm chromophore of glutamate decarboxylase is an aldamine formed by addition of a second amino group to the carbon nitrogen double bond, rather than any other sort of aldamines or a normal Schiff base structure.

Journal ArticleDOI
TL;DR: The spectral properties of PLP in glycogen phosphorylase and in aspartate aminotransferase are ascribed to the possibility of H-bonding interaction between the coenzyme and its microenvironment.



Journal ArticleDOI
TL;DR: The (fluoroalkyl)cobalt(III) Schiff-base complexes R f CoChelL (R f =CF 3, C 2 F 5, C 3 F 7 ; Chel = Salen, Acacen, Tfacacen and Bzacacen; L = -, H 2 O, pyridine) have been synthesised by oxidative addition of R f I to tetrahydrofuran solutions of sodium reduced cobalt Schiff base chelates as discussed by the authors.

Journal ArticleDOI
TL;DR: The planar transition metal compounds NN′-ethylenebis(salicylideneaminato)metal(II)[MII(salen)] where the metal ion is cobalt(II), nickel(II, or copper(II) react with the halides SnX4 and SnX2 to form 1 : 1 adducts as mentioned in this paper.
Abstract: The planar transition metal compounds NN′-ethylenebis(salicylideneaminato)metal(II)[MII(salen)] where the metal ion is cobalt(II), nickel(II), or copper(II), react with the halides SnX4 and SnX2(where X = Cl or Br) to form 1 : 1 adducts Characterisation of these adducts using magnetic data, and diffuse reflectance and ir spectroscopy indicates a retention of planarity about the transition-metal ion Structures are suggested for the adducts A mechanism is put forward to explain the metal-exchange reaction observed in polar solvents for the adducts CoII(salen)SnX4, leading to the compounds SnX2(salen)


Journal ArticleDOI
TL;DR: The reactions of a few bifunctional and tridentate Schiff bases with titanium and zirconium(IV) isopropoxides in equimolar and bimolar ratios are described in this article.
Abstract: The reactions of a few bifunctional and tridentate Schiff bases with titanium-(IV) and zirconium(IV) isopropoxides in equimolar and bimolar ratios are described. The resulting compounds have been obtained in almost quantitative yields and are of the general formulae M(SB)x(OPri)4−2X (where M = Ti or Zr; SB- = anion of the Schiff base SBH2 and x = 1 or 2). Their molecular weights have been determined ebullioscopically and IR spectra recorded. Es wurden Reaktionen einiger bifunktioneller dreizahniger Schiffscher Basen mit TiIV- und ZrIV-Isopropylat untersucht. Verbindungen der allgemeinen Formel MIV(SB)x(OPri)4−2x wurden dabei in fast quantitativer Ausbeute isoliert (SB- = Anion der Schiffschen Base SBH2; Pri = isopropyl; x = 1 oder 2). Die Molmassen wurden ebullioskopisch bestimmt und die IR-Spektren aufgenommen.

Journal ArticleDOI
TL;DR: In this paper, the magnetic properties of the ligand N,N′-bis(salicylidene)-1,1-(dimethyl)ethylenediamine (Sal 2 - i -bn) and its complexes with divalent nickel, cobalt, copper and palladium have been synthesized for the first time.

Journal ArticleDOI
W.M. Coleman1, L.T. Taylor1
TL;DR: Nickel(II) complexes of linear potentially pentadentate Schiff base ligands derived from variously substituted salicylaldehydes and bis(2,2′-aminoethyl)sulfide have been prepared as mentioned in this paper.


Journal ArticleDOI
TL;DR: In this paper, the temperature dependence of the proton Knight shifts in the ligands has been interpreted in terms of the contact hyperfine interaction constant A and exchange integral J. The fitting of these shifts represents a novel method for the evaluation of J in such systems.
Abstract: N.m.r. data are reported for oxygen-bridged iron(III) complexes of the type (FeIIIL2)2O where L is a bidentate Schiff-base ligand. The temperature-dependence of the proton Knight shifts in the ligands has been interpreted in terms of the contact hyperfine interaction constant A and exchange integral J. The fitting of these shifts represents a novel method for the evaluation of J in such systems.

Journal ArticleDOI
TL;DR: In this paper, a Schiff base prepared from an aromatic or heterocyclic aldehyde and an aliphatic amine was shown to give 1:2-adducts, whose spectroscopic properties can only be reconciled with the new ring system spiro-pyrrolidin-1,2-(pyrrolinidino[3.4-c ]pyrrin) and not with a newly formed 6-membered ring as described for adducts of Schiff bases with other dipolarophiles.

Journal ArticleDOI
TL;DR: In this paper, a series of planar diamagnetic, nickel complexes, derived from pyrrole-2-carbaldehyde, and 1,2-diaminobenzene, 1, 2-dimino-ethane and -propane, have been characterised by electronic, mass and proton magnetic resonance spectroscopy.
Abstract: A series of planar, diamagnetic, nickel complexes, derived from pyrrole-2-carbaldehyde, and 1,2-diaminobenzene, 1,2-diaminonaphthalene, 1,2-diamino-ethane and -propane, 1,2-diamino-(2-methyl)propane, 1,3-diaminopropane, and DL- and meso-2,4-diaminopentane, have been characterised by electronic, mass and proton magnetic resonance spectroscopy. A palladium complex derived from 1,3-diaminopropane is also described. A complete assignment of all resonances in the 1H n.m.r. spectra of each complex is given, and the conformation of the group bridging the two pyrrolyl residues in the complexes derived from 1,2-diaminopropane and DL-2,4-diaminopentane has been established in solution. The complexes were examined by polarography and cyclic voltammetry and were shown to undergo one reduction process; only in the species derived from 1 3-diaminopropane and DL-2,4-diaminopentane was this wave reversible.

Journal ArticleDOI
TL;DR: In this paper, Lanthanide(III) complexes with N-t-butylsalicylideneiminate (abbreviated as H-SAL.t-C4H9) have been synthesized as yellow crystals by the reaction of several lanthanide (III) chloride hydrates and the Schiff base.
Abstract: Lanthanide(III) complexes with N-t-butylsalicylideneiminate (abbreviated as H-SAL.t-C4H9) have been synthesized as yellow crystals by the reaction of several lanthanide(III) chloride hydrates and the Schiff base. The complexes obtained, which were purified by recrys tallization from appropriate organic solvents, are represented by the formula In(H-SAL. t-C4H9)3.3H2O, where the notation Ln denotes tervalent La, Pr, Nd, Gd, Yb, and Lu.


Journal ArticleDOI
TL;DR: The rate of binding of pyridoxal 5'-phosphate to apoglutamate decarboxylase has been measured as a function of coenzyme concentration at 20°, pH 4.9, and first order kinetics is observed for at least three half-lives.


Journal ArticleDOI
TL;DR: The second-order rate constants correlate with rate constants for aquation of tris-[α-(2-pyridyl)benzylideneaniline]iron(II) complexes with cyanide in a range of aqueous alcohols indicate a bimolecular reaction mechanism as discussed by the authors.
Abstract: Kinetics of reaction of tris-[α-(2-pyridyl)benzylideneaniline]iron(II) complexes with cyanide in a range of aqueous alcohols indicate a bimolecular reaction mechanism. Second-order rate constants correlate with rate constants for aquation of the respective complexes, and with Grunwald–Winstein solvent Y values.