Journal of inclusion phenomena
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Mebendazole complexes with various cyclodextrins: preparation and physicochemical characterization
Journal of inclusion phenomena - - 2007
Complexation of Vinpocetine with Cyclodextrins in the Presence or Absence of Polymers. Binary and Ternary Complexes Preparation and Characterization
Journal of inclusion phenomena - Tập 44 - Trang 251-256 - 2002
Inclusion complexation between β-cyclodextrin (β-CD),hydroxypropyl-β-cyclodextrin (HP-β-CD), water-solublepolymers (PVP and HPMC) and vinpocetine was studied in aqueous solution and in the solid state.Phase solubility studies were used to evaluate the complexation in aqueous solution at roomtemperature. Stability constants (Kc) of binary and ternary complexes were determined spectrophotometrically...... hiện toàn bộ
Studies of curcumin and curcuminoids. XXXVI. The stoichiometry and complexation constants of cyclodextrin complexes as determined by the phase-solubility method and UV–Vis titration
Journal of inclusion phenomena - Tập 66 - Trang 335-348 - 2009
Cyclodextrin (CD) complex stoichiometry and complexation constant with two symmetric curcuminoids and two unsymmetric curcuminoid-like compounds were investigated and compared by two independent methods, the phase-solubility method and ultraviolet-visible absorption spectroscopy (UV–Vis) titration. Two different methods were applied in an effort to increase the apparent intrinsic solubility of the...... hiện toàn bộ
Synthesis and structure analysis of sandwich complexes of potassium and cesium with benzo-15-crown-5 derivatives
Journal of inclusion phenomena - Tập 77 - Trang 301-308 - 2012
Two novel alkali cation sandwich complexes have been constructed by reaction of potassium and cesium picrate with double-armed benzo-15-crown-5 ether 1. Crystals of the K+Pic−2(B15C5) and Cs+Pic−2(B15C5) complexes (Mr = 1339.81, 2865.23) are all yellow prisms which belong to the orthorhombic space group Pna2(1) with a = 25.757(5), b = 12.927(3), c = 37.507(8) Å and a = 25.905(7), b = 12.998(3), c ...... hiện toàn bộ
Synthesis and extraction abilities of mono-formylated calix[4]-1,3-aza-crown and its hydrazone derivatives
Journal of inclusion phenomena - Tập 74 - Trang 257-263 - 2012
By formylation of calix[4]-1,3-aza-crown in hexamethylenetetramine/trifluoroacetic acid system, the first formylated calix[4]-aza-crown derivative 6 was synthesized in yield of 61%. Reacting compound 6 with salicyloyl hydrazine, 2,4-dinitrophenyl hydrazine, nicotinyl hydrazine or phenyl thiosemicarbazide afforded four novel calix[4]crown hydrazone derivatives 7a–d in yields of 70–90%. By condensat...... hiện toàn bộ
Regioselective Nitration of 4′-R-Dibenzo-18-Crown-6 by Some Alkaline Metals Nitrates in Polyphosphoric Acid
Journal of inclusion phenomena - Tập 49 - Trang 145-151 - 2004
We have studied the effect of the substituent nature on nitration of 4′-R-dibenzo-18-crown-6 (DB18C6, where R is NO2, CH3CO, or C2H5) in polyphosphoric acid (PPA). We also studied the influence of cations' nature on regioselectivity of nitration. It was found that electron withdrawing substituents direct the incoming NO2-group mainly to the 4″-position of the unsubstituted benzene ring in the reac...... hiện toàn bộ
Interaction of indomethacin–cyclodextrins in water by UV–Vis and ITC
Journal of inclusion phenomena - Tập 95 - Trang 55-62 - 2019
In this contribution, we analyze indomethacin–cyclodextrin (IMC–CD) inclusion by means of UV–Vis spectrophotometry and isothermal titration calorimetry (ITC) at 25 °C. Experiments were carried out in water at pH 5 and 7, using β-CD and 2-hydroxypropyl-β-cyclodextrin (2-HP-β-CD). The study with UV–Vis was made using a molar relation method analyzing the spectra with Stability Quotients from Absorba...... hiện toàn bộ
Enthalpy and entropy changes on molecular inclusion of pentane derivatives into α-cyclodextrin cavities in aqueous solutions
Journal of inclusion phenomena - Tập 70 - Trang 269-278 - 2010
In order to investigate the contribution of the hydrophilic parts of guest molecules of aliphatic compounds to the inclusion reaction, the thermodynamic properties of inclusion compounds of cyclodextrin (α-CD) with eight pentane derivatives into the cavity of α-CD in dilute aqueous solutions were measured by micro-calorimeter at 298.15 K. The thermodynamic properties of the inclusion reactions of ...... hiện toàn bộ
The Spectral Displacement Technique for Determining the Binding Constants of β-Cyclodextrin – Alkyltrimethylammonium Inclusion Complexes
Journal of inclusion phenomena - Tập 47 - Trang 133-136 - 2003
A survey of the literature reveals that the spectroscopic displacement method, in which phenolphthalein is used as a competitive chromophore to determine binding constants of β-cyclodextrin with surfactants was successful in the case of homologous hydrocarbon and fluorocarbon anionic surfactants. We show here that this method can be applied also for homologous alkyltrimethylammonium bromides (with...... hiện toàn bộ
Studies on werner clathrates. Part 131. Selective criteria in werner clathrates. Six crystal structures with bis(isothiocyanato)tetra(4-vinylpyridine)nickel(II) as host
Journal of inclusion phenomena - Tập 16 - Trang 25-54 - 1993
This paper addresses the general question: what are the significant guest properties selected by this host when interacting with guest molecules in the liquid phase, resulting in cocrystallization of the host and guest? In particular, to what extent do π electrons in a guest molecule effect its potential as a guest? Werner clathrates of the host [Ni(NCS)2(4-ViPy)4] with mixtures of tetrahydrofuran...... hiện toàn bộ
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