Zwitterionic (E)-6-methyl-2-oxo-3-[1-(p-tolyliminio)ethyl]-2H-pyran-4-olate

Abstract

Key indicatorsSingle-crystal X-ray study T = 173 K Mean (C-C) = 0.003 Å R factor = 0.040 wR factor = 0.110 Data-to-parameter ratio = 14.4For details of how these key indicators were automatically derived from the article, see

Synthesis, spectroscopic characterization and antibacterial activities of three Schiff bases derived from dehydroacetic acid with various substituted anilines

“…Also a strong band appears in the range of 1694 cm -1 in the free ligand, which is assigned to the C=O group of the pyran ring. The Schiff bases synthesized exist in tautomeric form, mainly as imine-enol form, this is also supported by IR and NMR data [2,9,11,[17][18][19]. H NMR data (δ ppm), J (Hz) for Schiff bases is given in Table 3.…”

“…This class of ligand is flexible in terms of both size and charge [2]. Schiff base ligands and their metal complexes are omnipresent because of their easy synthesis, wide applications and the convenience of diverse structural modifications [3].…”

Synthesis, structural characterization and biological evaluation of mononuclear transition metal complexes of zwitterionic dehydroacetic acidN‐aroylhydrazone ligand

“…The keto form of the free ligand is evident from the single bond nature of C14‐N2 bond and the double bond character of C14‐O2 bond. The ligand is found to exist in zwitterionic form and formally a neutral species as evident by the presence of hydrogen atom (H3B) on N3 rather than O3, where there exists a single bond character for C18‐O3 bond . Two intramolecular hydrogen bonds, involving N1‐H1B with O2 and N3‐H3B with O3 are observed.…”

(Z)-Ethyl 4-chloro-3-oxo-2-(2-p-tolylhydrazono)butanoate

“…L(1), has the following structural properties : Monoclinic, P2 1 /c, a=11.8933 (5)Å, b=7.9260(3)Å, c = 12.9177 (7)Å, β = 91.2598 (14)°, and Z = 4; for L(2) a= 7.561(5), b =8.738(7), c=10.209(12), α=85.018(4)°, β=79.311(3)°, γ=76.008(8) and Z = 2. The two molecules have a zwitterionic form with cationic iminium and anionic enolate groups [4]. An electrochemical study, by cyclic voltammetry for the two compond, has been achieved in aprotic medium, DMF-TBAHFB 0.1M, on a platin electrode of 2 mm of diameter.…”