Melaphen, malamine, and bis(hydroxymethyl)phosphinic acid. Acid-base properties and behavior in the presence of some metal cations

2009 ◽  
Vol 79 (6) ◽  
pp. 1074-1079 ◽  
Author(s):  
Yu. I. Sal’nikov ◽  
G. A. Boos ◽  
I. S. Ryzhkina ◽  
S. G. Fattakhov ◽  
G. A. Chmutova ◽  
...  
Keyword(s):  
Phosphinic Acid ◽  
Metal Cations ◽  
Acid Base ◽  
Acid Acid ◽  
And Behavior ◽  
Base Properties

Simultaneous removal of dyes and metal cations using an acid, acid-base and base modified vermiculite as a sustainable and recyclable adsorbent

2017 ◽  
Vol 576 ◽  
pp. 398-408 ◽  
Author(s):  
Wojciech Stawiński ◽  
Agnieszka Węgrzyn ◽  
Olga Freitas ◽  
Lucjan Chmielarz ◽  
Grzegorz Mordarski ◽  
...  
Keyword(s):  
Metal Cations ◽  
Simultaneous Removal ◽  
Acid Base ◽  
Acid Acid ◽  
Recyclable Adsorbent

40 years with porphyrazines

2019 ◽  
Vol 23 (11n12) ◽  
pp. 1251-1264 ◽  
Author(s):  
Ol’ga G. Khelevina ◽  
Alena S. Malyasova
Keyword(s):  
Metal Complexes ◽  
Proton Acceptor ◽  
Acid Base ◽  
Coordination Properties ◽  
And Behavior ◽  
Base Properties

Our laboratory started research on tetraazaporphyrins in the middle of the 1970s. Before our works there was no information in the literature about coordination and ionization properties of these compounds, formation of their metal complexes or their state and behavior in proton-donating and proton-acceptor media. We carried out the first studies of the coordination and acid-base properties of unsubstituted tetraazaporphine [1], its octaphenyl [2] and tetra(tetramethylene)-[3] substituted derivatives. In this micro-review we summarize our works on the peripheral functionalization of unsubstituted porphyrazines and on their acid-base and coordination properties.

Understanding the behaviour of carnosine in aqueous solution: an experimental and quantum-based computational investigation on acid-base properties and complexation mechanisms with Ca2+ and Mg2+

2021 ◽  
Author(s):  
Chiara Abate ◽  
Giuseppe Cassone ◽  
Massimiliano Cordaro ◽  
Ottavia Giuffrè ◽  
Viviana Mollica Nardo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Parameters ◽  
Metal Cations ◽  
Computational Investigation ◽  
Acid Base ◽  
Essential Metal ◽  
Potential Interactions ◽  
Base Properties

A thorough investigation on the acid-base properties of carnosine and its potential interactions with the two essential metal cations, Ca2+ and Mg2+, is here reported. The thermodynamic parameters of protonation...

Acid-base properties of 1,3-diphenyl-5-(1H-tetrazol-2-yl)formazan and 1,3-diphenyl-5-(2H-1,2,4-triazol-3-yl)formazan

1982 ◽  
Vol 47 (11) ◽  
pp. 2882-2889
Author(s):  
Nadezhda Likhareva ◽  
Ladislav Šůcha ◽  
Miloslav Suchánek
Keyword(s):  
Computer Program ◽  
Dissociation Constants ◽  
Acid Base ◽  
New Compounds ◽  
Base Properties

Two new compounds from the formazan series, viz. 1,3-diphenyl-5-(1H-tetrazol-2-yl)formazan and 1,3-diphenyl-5-(2H-1,2,4-triazol-3-yl)formazan, were prepared, and the dissociation constants and molar absorptivities of all of their acid-base species were determined spectrophotometrically employing the SPEKTFOT computer program.

Acid-base properties of metals and glasses of Na2O.P2O5-xB2O3 system

1984 ◽  
Vol 49 (10) ◽  
pp. 2355-2362 ◽  
Author(s):  
Juraj Leško ◽  
Marie Dorušková ◽  
Jan Tržil
Keyword(s):  
Boron Oxide ◽  
A Priori ◽  
Optical Basicity ◽  
Galvanic Cell ◽  
Acid Base ◽  
Tetrahedral Configuration ◽  
Relative Basicity ◽  
Base Theory ◽  
Base Properties

Boron oxide in the Na2O.P2O5-x B2O3 system behaves as a Lux base. Its addition to Na2O.P2O5 brings about transformation of a Co(II) indicator from octahedral to tetrahedral configuration, increase in the optical basicity ΛPb(II), increase in the relative basicity of the melt as determined by means of a galvanic cell, and depolymerization reactions releasing PO43- ions. In the Na2O-B2O3 system free of P2O5, boron oxide behaves as a Lux acid. The amphoretic nature of B2O3 is explained in terms of Lux's acid-base theory extended in analogy with the protolysis theory. The theoretical optical basicity values do not indicate the amphoretic behaviour of B2O3 because in this approach boron oxide is a priori regarded as more acidic than Na2O.P2O5.

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