Spectrophotometric, FTIR and theoretical studies of the charge-transfer complexes between isoniazid (pyridine-4-carboxylic acid hydrazide) and the acceptors (p-chloranil, chloranilic acid and tetracyanoethylene) in acetonitrile, their association constants, thermodynamic properties and other related properties

Preparation and characterization of liprotides prepared from protein extracts of mung beans (Vigna radiata (L.))

“…Peak shifts also occurred between the albumin-OA complexes and the OA controls. It is interesting to note that previous works attributed frequency shifts to potential complexation, which in the current study is between OA and the protein (Bagchi et al, 2012;Sharma & Lahiri, 2008;Yan et al, 2020). Such instances of peak shifting in FTIR analysis have two common perspectives: either the change in peak position is caused by the actual frequency shift of a distinct absorption band or by the relative intensity contributions of coinciding bands, such as the amide I band (Ryu et al, 2011).…”

Studies on the weak interactions and CT complex formations between chloranilic acid, 2,3-dichloro-5,6-dicyano-p-benzoquinone, tetracyanoethylene and papaverine in acetonitrile and their thermodynamic properties, theoretically, spectrophotometrically aided by FTIR

“…But whatever may be the method, K DA -values using BenesiHildebrand [37] equation under conditions D ) A or A ) D can never be regarded to be accurate values for the thermodynamic association constants though the Benesi-Hildebrand equation have been extensively used till now. The limitations of BenesiHildebrand equation were discussed in some recent publications [23][24][25][26][27]. Therefore, K DA determined in the present work can be regarded to be accurate thermodynamic K DA -values.…”

“…Interpretation of IR spectra [23][24][25][26][27] Solid charge-transfer complexes of P with acceptors stated before were isolated. FTIR spectra of the complexes and the components are presented (Figs.…”

“…The importance of CT complexes in biological systems was studied by Mulliken et al [9][10][11][12][13][14][15][16][17] Lahiri et al [18][19][20][21][22][23][24][25][26][27][28][29][30][31] made studies on CT complexes between drugs and various acceptors to explore the role of weak interactions (CT and H-bonding) in understanding drug receptor interactions.…”

Eco-Friendly Synthesis, Spectral, Bio-Potential, DNA Binding and Antituberculosis Activities of Ni(II) And Cu(II) Complexes

“…The mixed ligand, benzoate ion shows the stretching frequencies of ν(C=C) at 1400-1600 cm -1 , ν(C=O) at 1680-1750 cm -1 , ν(C=H) at 3000-3050 cm -1 , ν(C-O) at 1210-1320 cm -1 . Except ν(C-O), all the other frequencies are slightly changed but the ν(C-O) in Ni(II) complex is 1219 cm -1 and in Cu(II) is 1220 cm -1 confirming the mixed ligand also enter into the coordination sphere through the oxygen atom 12,13 . …”