Schiff base equilibria. I. Formation and distribution of N-n-butylsalicylideneimine

1965 ◽  
Vol 18 (3) ◽  
pp. 329 ◽  
Author(s):  
RW Green ◽  
PW Alexander
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Distribution Coefficient ◽  
Equilibrium Constant ◽  
Neutral Form ◽  
Phenolic Group

The equilibrium constant governing the formation of a Schiff base from salicylaldehyde and n-butylamine in aqueous solution has been evaluated by spectrophotometry as 5.62 x 104. The pK of the phenolic group of the Schiff base is 12.0. These constants have been used to account for the distribution of salicylaldehyde between water and toluene in the presence of butylamine. The neutral form of the Schiff base has a distribution coefficient of 1.9 x 103.

Schiff base equilibria. II. Beryllium complexes of N-n-butylsalicylideneimine and the hydrolysis of the Be2+ ion

1965 ◽  
Vol 18 (5) ◽  
pp. 651 ◽  
Author(s):  
RW Green ◽  
PW Alexander
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Complex Formation ◽  
Distribution Coefficient ◽  
Dilute Aqueous Solution ◽  
The Stability ◽  
Ph Range ◽  
Hydrolysis Of ◽  
Beryllium Complexes ◽  
Equilibria In Aqueous Solution

The Schiff base, N-n-butylsalicylideneimine, extracts more than 99.8% beryllium into toluene from dilute aqueous solution. The distribution of beryllium has been studied in the pH range 5-13 and is discussed in terms of the several complex equilibria in aqueous solution. The stability constants of the complexes formed between beryllium and the Schiff base are log β1 11.1 and log β2 20.4, and the distribution coefficient of the bis complex is 550. Over most of the pH range, hydrolysis of the Be2+ ion competes with complex formation and provides a means of measuring the hydrolysis constants. They are for the reactions: Be(H2O)42+ ↔ 2H+ + Be(H2O)2(OH)2, log*β2 - 13.65; Be(H2O)42+ ↔ 3H+ + Be(H2O)(OH)3-, log*β3 -24.11.

scholarly journals Schiff base equilibria. III. N-Methylsalicylideneimine

1966 ◽  
Vol 19 (2) ◽  
pp. 229 ◽  
Author(s):  
RW Green ◽  
Mesurier EL Le
Keyword(s):  
Schiff Base ◽  
Formation Constant ◽  
Distribution Coefficients ◽  
Neutral Form ◽  
Methyl Amine ◽  
Phenolic Group

At 25� the formation constant of the Schiff base of salicylaldehyde and methyl- amine is 3.72 x 104; and the pK of the phenolic group of the Schiff base is 11.7. The neutral form of the imine has distribution coefficients of 23.5 between water and toluene and 9.0 between water and cyclohexane.

A fluorescent colorimetric azo dye based chemosensor for detection of S2− in perfect aqueous solution and its application in real sample analysis and building a molecular logic gate

2018 ◽  
Vol 10 (20) ◽  
pp. 2317-2326 ◽  
Author(s):  
Amit Kumar Manna ◽  
Jahangir Mondal ◽  
Rukmani Chandra ◽  
Kalyani Rout ◽  
Goutam Kumar Patra
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Azo Dye ◽  
Color Change ◽  
Logic Gate ◽  
Real Sample ◽  
Sample Analysis ◽  
Real Sample Analysis ◽  
Molecular Logic Gate ◽  
Molecular Logic

A fluorescent-colorimetric azo dye based bis-Schiff base chemosensor, L, has been developed. L can selectively detect S2− through a color change from yellow to orange in perfect aqueous solution by deprotonation mechanism.

scholarly journals A fluorescent pH probe for an aqueous solution composed of 7-hydroxycoumarin, Schiff base and phenanthro[9,10-d]imidazole moieties (PICO)

2018 ◽  
Vol 24 (2) ◽  
pp. 93-97
Author(s):  
Shaoxin Li ◽  
Wei Kan ◽  
Bing Zhao ◽  
Ting Liu ◽  
Yue Fang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Fluorescent Probe ◽  
Fluorescence Intensity ◽  
Ph Probe ◽  
Pka Value

AbstractThe pH fluorescent probe 7-hydroxy-4-methyl-8-(((2-(1-phenyl-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)imino)methyl)-2H-chromen-2-one (PICO) contains a donor–π–acceptor (D–π–A) conjugated system. The ‘off−on’ probe PICO has a pKa value of 8.01 and its fluorescence intensity is enhanced with increasing pH.

Characterization of Metakaolin-Based Materials for Dye Adsorption from Aqueous Solution

2018 ◽  
Vol 283 ◽  
pp. 88-94
Author(s):  
Narumon Lertcumfu ◽  
Pharatree Jaita ◽  
Gobwute Rujijanagul ◽  
Tawee Tunkasiri
Keyword(s):  
Aqueous Solution ◽  
Aluminum Oxide ◽  
Distribution Coefficient ◽  
Alkaline Solution ◽  
Dye Adsorption ◽  
Adsorption Properties ◽  
High Adsorption ◽  
Uptake Capacity ◽  
High Adsorption Capacity

The properties of metakaolin-based materials were investigated. The studied materials were prepared by mixing metakaolin and aluminum oxide in alkaline solution. The obtained samples were cast into plastic molds and then left at 27°C for 24 h. The properties of the materials were investigated using XRD, FTIR, and SEM. The obtained results suggested that reaction of the mixed materials occurred. The adsorption properties of the materials, including removal efficiency, distribution coefficient, and uptake capacity were determined. The obtained results revealed that the studied materials exhibited high adsorption capacity, which is good for the adsorbent applications.

ChemInform Abstract: THE PKA AND KETO-ENOL EQUILIBRIUM CONSTANT OF ACETONE IN AQUEOUS SOLUTION

1984 ◽  
Vol 15 (17) ◽  
Author(s):  
Y. CHIANG ◽  
A. J. KRESGE ◽  
Y. S. TANG ◽  
J. WIRZ
Keyword(s):  
Aqueous Solution ◽  
Equilibrium Constant

A turn-on Schiff base fluorescent probe for the exogenous and endogenous Fe3+ ion sensing and bioimaging of living cells

2020 ◽  
Vol 44 (45) ◽  
pp. 19642-19649
Author(s):  
Lingjie Hou ◽  
Tao Liu ◽  
Yaling Gong ◽  
Jin Li ◽  
Chenhua Deng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Fluorescent Probe ◽  
Living Cells ◽  
Naphthalic Anhydride ◽  
Turn On ◽  
Ion Sensing

A Schiff base fluorescent probe, namely naphthalic anhydride – (2-pyridine) hydrazone (NAH), has been synthesized and developed for the highly selective and sensitive monitoring of Fe3+ ions in an aqueous solution and living cells.

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