Results 1 to 10 of about 905,743 (64)
مجلة علوم ذي قار, 2019 This research includes the synthesis and characterization of Shiff's bases crown ethers prepared from condensation between cis-diaminodibenzo-18-crown-6 and benzaldehyde substituted with some groups such as; 4-H , 4-CH2(CH2)6CH 3 , 4-Cl , 4-Br and 4-NO2
Raed A. Aubed
doaj +4 more sources
Some of the next articles are maybe not open access.
Lanthanide Compounds with S
AbstractLanthanide adducts with N,N′‐bis(salicylidene)‐1,3‐propylendiamine and N,N′‐bis(salicylidene)‐1,3‐propylendiamine‐2‐olo have been prepared. It is noted that the molecules, and not anions, of the SCHIFF bases are coordinated with the metal ion.Bi‐ and trinuclear lanthanide complexes with the “complex ligand”, N,N′‐1,3‐propylen‐bis ...
G. Condorelli +3 more
openaire +1 more source
Polymerization of cyclic SCHIFF's bases
Die Makromolekulare Chemie, 1970AbstractPolymerization of various cyclic SCHIFF's bases by cationic catalysts was attempted. It was found that a five membered cyclic SCHIFF's base such as 5.5‐dimethylpyrroline‐Δ1 gives a powdery product having a molecular weight of about 1,000 while six membered ones cannot be polymerized at all. Although the structure of the polymer obtained is much
Kunihiro Harada +3 more
openaire +1 more source
Tetradentate S
Abstract1:1‐complexes of lead(IV) with these tetradentate SCHIFF bases have been prepared in the pure form. These are non‐ electrolytes in DMF, and hence can be considered to have octahedral configuration. The IR spectra of the complexes show no pattern for H‐bonded OH. The phenolic CO stretch shows a shift towards longer wavelengths.
N. S. Biradar, V. H. Kulkarni
openaire +1 more source
Polyaddition reactions of S
AbstractNew polymers were obtained by polyaddition reactions of various SCHIFF's bases and diisocyanates. The structure of the polymers obtained was investigated by model reactions and thermal analysis. The results show that there are several reaction modes in these polyaddition reactions and the polymers hardly have the simple and regular structure.
Kunihiro Harada +3 more
openaire +1 more source
Studies of the Metal Chelates of some S
AbstractThe SCHIFF bases, 4‐(2‐hydroxy‐ethylimino) pentane‐2‐one (abbr. HEA) und 1‐[N‐(2′‐hydroxyethyl)iminomethyl]‐2‐naphthol (abbr. HNA) form solid complexes with Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Cd(II) and UO2(II). The elemental analyses, molecular weight, magnetic moment values and electronic spectral data have been used to establish the ...
R. K. Mehta, R. K. Gupta, V. C. Singhi
openaire +1 more source
Condensation of Unsaturated S
Abstract1, 4‐Dihydropyridine derivatives have been obtained by MICHAEL condensation with cinnamylidene anilines 1 or N‐p‐tolyl‐chalcone imine 5. With ethyl acetoacetate 1 and 5 yield 1‐aryl‐2‐methyl‐3‐ethoxycarbonyl‐4‐phenyl‐1, 4‐dihydropyridines 2 and 6, with diethyl malonate 1‐aryl‐3‐ethoxycarbonyl‐2‐oxo‐4‐phenyl‐1, 2, 3, 4‐tetrahydropyridines 7 and ...
A. Sammour +2 more
openaire +1 more source
Conjugated polymeric S
AbstractPolymeric SCHIFF's bases have been obtained by the condensation of conjugated dialdehydes, such as glyoxal and terephthalaldehyde, with conjugated diamines such as phenylenediamine or diamino phenol. Low molecular weight coloured polymers are obtained from aqueous systems, while high molecular weight black polymers are obtained by dilute ...
J. W. Akitt +3 more
openaire +1 more source
Six and eight coordinate complexes of tin(IV) with some aromatic S
AbstractA few complexes of tin(IV) chloride with some Schiff bases have been prepared in benzene medium. The complexes are orange red in colour and amorphous. The elemental analysis shows that these are 1:1 or 1:2 adducts. They are nonelectrolytes in DMF.
N. S. Biradar, V. B. Mahale
openaire +1 more source
Some novel nanostructure
AbstractIn this paper, five new zinc‐Schiff base compounds formulated as ZnLX2 (L is a new N3‐Schiff base ligand obtained by condensation reaction between diethylenetriamine and (Z)‐3‐(4‐(dimethylamino)phenyl) acrylaldehyde and X is (Cl−, Br−, I−, N3−, and NCS−)) were synthesized and characterized by Fourier transform infrared, 1H and 13C NMR, UV ...
S. Khani, M. Montazerozohori, R. Naghiha
openaire +1 more source