Schiff bases from α-ionone with adenine, cytosine, l-leucine biomolecules: Synthesis, structural features, electronic structure and medicinal activities

Author(s):  
P. Surendar ◽  
T. Pooventhiran ◽  
Shameela Rajam ◽  
Ahmad Irfan ◽  
Renjith Thomas
2014 ◽  
Vol 50 (53) ◽  
pp. 6949-6966 ◽  
Author(s):  
Soji Shimizu ◽  
Nagao Kobayashi

This feature article summarizes recent contributions of the authors in the synthesis of structurally-modified subphthalocyanines, which covers (1) modification of the conjugated system, (2) core-modification, and (3) exterior-modification.


1977 ◽  
Vol 32 (5) ◽  
pp. 551-561 ◽  
Author(s):  
John R. Wasson ◽  
H. Wayne Richardson ◽  
William E. Hatfield

Copper(II) complexes with the Schiff bases formed by condensing t-butyl-, isopropyl-, cyclohexyl- and diphenylmethylamines with salicylaldehyde and 3-methoxy- and 5-nitrosalicyl-aldehyde have been prepared and characterized. The isotropic nuclear hyperfine coupling constants increase in the order t-butyl < isopropyl < cyclohexyl < diphenylmethyl for the N-substituents in the three series of complexes while isotropic g-values increased in the opposite direction. Spectra structure correlations were examined and discussed.


2018 ◽  
Vol 34 (4) ◽  
pp. 2031-2042 ◽  
Author(s):  
Tahseen Saddam Fandi Al-Mathkuri ◽  
Hamid Mohammed Saleh Al-Jubori ◽  
Ali Taha Saleh

The compound 6-amino-5-mercapto-4H-1,2,4-triazol-3-yl)-9-fluoro-3-methyl-10-(4-methylpiperazin-1-yl)-2,3-dihydro-7H-[1,4] oxazino[2,3,4-ij] quinolin-7-one (M1) synthesize from the reaction of thiocarbohydrazide with levofloxacin acid by using ethanol as a solvent, phenolic Schiff bases (Z)-9-fluoro-6-(4-((4-hydroxybenzylidene) amino)-5-mercapto4H1,2,4-triazol-3-yl)-3-methyl-10-(4-methylpiperazin-1-yl)-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij] quinolin-7-one (M2), (Z)-6-(4-((2,4-dihydroxybenzylidene) amino)-5-mercapto-4H-1,2,4-triazol-3-yl)-9-fluoro-3-methyl-10-(4-methylpiperazin-1-yl)-2,3-dihydro-7H-[1,4] oxazino[2,3,4-ij]quinolin-7-one (M3) and (Z)-6-(4-((5-chloro-2-hydroxybenzylidene) amino)-5-mercapto-4H-1,2,4-triazol-3-yl)-9-fluoro-3-methyl-10-(4-methylpiperazin-1-yl)-2,3-dihydro-7H- [1,4] oxazino[2,3,4-ij] quinolin-7-one (M4) were prepared from the reaction of trizol derivative of [M1] compound with the appropriate phenolic aldehydes by using ethanol as a solvent. The synthetic Schiff bases used to prepare numbers of phenolic polymers [M5-M7] from the reaction of Schiff bases [M2-M4] with phenol formaldehyde. The analytical efficiency of the synthetic chelating polymers studied by the batch method with different transition metals ions (Cd2+, Fe3+, Cu2+), in terms of the effect of treatment time and the pH on the loading capacity of the polymers, controlling the other factors such as temperature, ions concentration and quantity of polymers. The result shows that the capacity of the polymer increased with increasing of the pH and treating time. The synthetic compounds were characterized by various instrumental techniques like FTIR, 1H-NMR, DTG and TGA studies.These spectral and thermal studies provide very valuable information about the structural features.


Computation ◽  
2013 ◽  
Vol 1 (1) ◽  
pp. 16-26 ◽  
Author(s):  
Csaba Szakacs ◽  
Erika Merschrod S. ◽  
Kristin Poduska

1992 ◽  
Vol 70 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Sudhindra N. Misra ◽  
Shaun O. Sommerer

The absorption difference, comparative absorption spectrophotometry, and quantitative analysis of 4f–4f spectra of praseodymium(III) complexes with ligands possessing varying structural features and binding capabilities have clearly indicated that the 3H4 → 3P2, 3H4 → 3P1, 3H4 → 3P0, and 3H4 → 1D2 transitions exhibit substantial intensification as well as a wide variation of oscillator strength. Since these transitions do not follow the selection rules they cannot be considered hypersensitive. Ligands such as β-diketones, Schiff bases, amino acids, diols, nucleic bases, nucleosides, nucleotides, alkoxides, and haloacetates with widely differing binding features in terms of coordinating ability, denticity, and normalized bite appear to induce, to varying degrees, high sensitivity in these non-hypersensitive transitions. The present article reports the high sensitivity of the 3H4 → 3P2, 3P1, 3P0, and 1D2, transitions of Pr(III) by considering the solution spectra of 173 species. This unique sensitivity is termed Ligand Mediated Pseudohypersensitivity. Keywords: praseodymium(III), 4f–4f transitions, hypersensitive transitions.


2007 ◽  
Vol 63 (a1) ◽  
pp. s169-s169
Author(s):  
S. Ide ◽  
N. Ancın ◽  
H. Malkaş ◽  
S. G. Öztaş

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