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4-Hydroxybenzaldehyde

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Hongkun Zhao – One of the best experts on this subject based on the ideXlab platform.

  • Saturated Solubility and Thermodynamic Mixing Propertiesof 3,5-Dibromo-4-Hydroxybenzaldehyde in 16 Individual Solvents atElevated Temperatures
    Journal of Chemical & Engineering Data, 2020
    Co-Authors: Changfei Zhu, Hao Yin, Yanyan Zhou, Hongkun Zhao

    Abstract:

    This work aimed at saturated solubility of 3,5-dibromo-4-Hydroxybenzaldehyde in 16 individual solvents including n-pentanol, methanol, dimethylsulfoxide (DMSO), isobutanol, ethanol, 1,4-dioxane, n-…

  • 3-Bromo-4-Hydroxybenzaldehyde in Aqueous Cosolvent Mixtures of Acetonitrile, Ethanol, n-Propanol, and N,N-Dimethylformamide: Solubility, Preferential Solvation, and Solvent Effect Analysis
    Journal of Chemical & Engineering Data, 2020
    Co-Authors: Yuxin Bao, Hao Yin, Changfei Zhu, Hongkun Zhao

    Abstract:

    Solubility data determination of 3-bromo-4-Hydroxybenzaldehyde in aqueous cosolvent solutions of ethanol, acetonitrile, N,N-dimethylformamide (DMF), and n-propanol at the temperatures ranging from …

  • 3,5-dibromo-4-Hydroxybenzaldehyde dissolved in aqueous solutions of ethanol, n-propanol, acetonitrile and N,N-dimethylformamide: Solubility modelling, solvent effect and preferential solvation investigation
    The Journal of Chemical Thermodynamics, 2020
    Co-Authors: Changfei Zhu, Hongkun Zhao, Hao Yin, Ali Farajtabar

    Abstract:

    Abstract Equilibrium solubility of 3,5-dibromo-4-Hydroxybenzaldehyde in four aqueous solutions of ethanol/n-propanol/acetonitrile/N,N-dimethylformamide (DMF) was determined at temperatures covering from 278.15 K to 323.15 K. All determinations were carried out by the well-known saturation shake-flask method under atmospheric pressure of 101.2 kPa. The maximum values of solubility data appeared in neat ethanol/n-propanol/acetonitrile/DMF for each solution. By Jouyban-Acree model, Apelblat-Jouyban-Acree model and van’t Hoff-Jouyban-Acree model, the 3,5-dibromo-4-Hydroxybenzaldehyde solubility was well mathematically described obtaining RAD values smaller than 3.71% and RMSD values smaller than 2.27 × 10-4. The Kamlet and Taft linear solvation energy relationships were employed to examine the chief factors describing solvent effect. The cavity formation energy of solvents played a significant role on the solubility variation of 3,5-dibromo-4-Hydroxybenzaldehyde in different aqueous solutions. The local mole fractions of ethanol/n-propanol/acetonitrile/DMF and water molecules around the 3,5-dibromo-4-Hydroxybenzaldehyde molecule were quantitatively studied via the Inverse Kirkwood–Buff integrals way used to the solubility values. 3,5-Bibromo-4-Hydroxybenzaldehyde was preferentially solvated by water in water-rich compositions for the ethanol/n-propanol/acetonitrile/DMF + water mixtures; while within co-solvent-rich and intermediate compositions, 3,5-dibromo-4-Hydroxybenzaldehyde was preferentially solvated by ethanol/n-propanol/acetonitrile/DMF.

Diana Dragancea – One of the best experts on this subject based on the ideXlab platform.

  • vanadium v complexes with substituted 1 5 bis 2 hydroxybenzaldehyde carbohydrazones and their use as catalyst precursors in oxidation of cyclohexane
    Inorganic Chemistry, 2016
    Co-Authors: Diana Dragancea, Sergiu Shova, Martin Breza, Peter Rapta, Natalia Talmaci, Ghenadie Novitchi, Denisa Darvasiova, Markus Galanski, Jozef Kožisek, Nuno M R Martins

    Abstract:

    Six dinuclear vanadium(V) complexes have been synthesized: NH4[(VO2)2(HLH)] (NH4[1]), NH4[(VO2)2(t-BuLH)] (NH4[2]), NH4[(VO2)2(ClLH)] (NH4[3]), [(VO2)(VO)(HLH)(CH3O)] (4), [(VO2)(VO)(t-BuLH)(C2H5O)] (5), and [(VO2)(VO)(ClLH)(CH3O)(CH3OH/H2O)] (6) (where HLH4 = 1,5-bis(2-hydroxybenzaldehyde)carbohydrazone, t-BuLH4 = 1,5-bis(3,5-di-tert-butyl-2-hydroxybenzaldehyde)carbohydrazone, and ClLH4 = 1,5-bis(3,5-dichloro-2-hydroxybenzaldehyde)carbohydrazone). The structures of NH4[1] and 4–6 have been determined by X-ray diffraction (XRD) analysis. In all complexes, the triply deprotonated ligand accommodates two V ions, using two different binding sites ONN and ONO separated by a diazine unit −N–N–. In two pockets of NH4[1], two identical VO2+ entities are present, whereas, in those of 4–6, two different VO2+ and VO3+ are bound. The highest oxidation state of V ions was corroborated by X-ray data, indicating the presence of alkoxido ligand bound to VO3+ in 4–6, charge density measurements on 4, magnetic susceptibil…

  • copper ii complexes with 1 5 bis 2 hydroxybenzaldehyde carbohydrazone
    Polyhedron, 2014
    Co-Authors: Diana Dragancea, Sergiu Shova, Edward A Enyedy, Martin Breza, Peter Rapta, Luca M Carrella, Eva Rentschler, Anatolie Dobrov, Vladimir B Arion

    Abstract:

    Abstract The acid–base properties of 1,5-bis(2-hydroxybenzaldehyde)carbohydrazone (H4L) and its thioanalogue 1,5-bis(2-hydroxybenzaldehyde)thiocarbohydrazone (H4LS) have been studied experimentally by pH-potentiometry and UV–Vis spectrophotometry and theoretically by using DFT methods. Copper(II) complexes [Cu2(HL)(DMSO)2(H2O)]NO3·H2O (1), [{Cu2(HL)(DMF)(H2O)}n][{Cu2(HL)(DMF)NO3}n](NO3)n (2), [Cu2(HL)(DMF)2(H2O)]HSO4·H2O (3), [Cu2(HL)(DMF)2(H2O)][Cu2(HL)(SO4)(H2O)(DMF)2]·2H2O (4) and [Cu4(HL)2(HSO4)(DMF)2]HSO4 (5), where H4L = 1,5-bis(2-hydroxybenzaldehyde)carbohydrazone, have been synthesised. Complexes 1–3 have been characterised by elemental analysis, IR spectroscopy, ESI mass spectrometry, cyclic voltammetry, magnetic susceptibility measurements and X-ray diffraction, while 4 and 5 only by X-ray crystallography. X-ray diffraction revealed that the ditopic triply deprotonated ligand possesses two binding sites able to accommodate transition metal ions, namely ONN and ONO. Magnetic measurements showed antiferromagnetic interactions between copper(II) centres.

Changfei Zhu – One of the best experts on this subject based on the ideXlab platform.

  • Saturated Solubility and Thermodynamic Mixing Propertiesof 3,5-Dibromo-4-Hydroxybenzaldehyde in 16 Individual Solvents atElevated Temperatures
    Journal of Chemical & Engineering Data, 2020
    Co-Authors: Changfei Zhu, Hao Yin, Yanyan Zhou, Hongkun Zhao

    Abstract:

    This work aimed at saturated solubility of 3,5-dibromo-4-Hydroxybenzaldehyde in 16 individual solvents including n-pentanol, methanol, dimethylsulfoxide (DMSO), isobutanol, ethanol, 1,4-dioxane, n-…

  • 3-Bromo-4-Hydroxybenzaldehyde in Aqueous Cosolvent Mixtures of Acetonitrile, Ethanol, n-Propanol, and N,N-Dimethylformamide: Solubility, Preferential Solvation, and Solvent Effect Analysis
    Journal of Chemical & Engineering Data, 2020
    Co-Authors: Yuxin Bao, Hao Yin, Changfei Zhu, Hongkun Zhao

    Abstract:

    Solubility data determination of 3-bromo-4-Hydroxybenzaldehyde in aqueous cosolvent solutions of ethanol, acetonitrile, N,N-dimethylformamide (DMF), and n-propanol at the temperatures ranging from …

  • 3,5-dibromo-4-Hydroxybenzaldehyde dissolved in aqueous solutions of ethanol, n-propanol, acetonitrile and N,N-dimethylformamide: Solubility modelling, solvent effect and preferential solvation investigation
    The Journal of Chemical Thermodynamics, 2020
    Co-Authors: Changfei Zhu, Hongkun Zhao, Hao Yin, Ali Farajtabar

    Abstract:

    Abstract Equilibrium solubility of 3,5-dibromo-4-Hydroxybenzaldehyde in four aqueous solutions of ethanol/n-propanol/acetonitrile/N,N-dimethylformamide (DMF) was determined at temperatures covering from 278.15 K to 323.15 K. All determinations were carried out by the well-known saturation shake-flask method under atmospheric pressure of 101.2 kPa. The maximum values of solubility data appeared in neat ethanol/n-propanol/acetonitrile/DMF for each solution. By Jouyban-Acree model, Apelblat-Jouyban-Acree model and van’t Hoff-Jouyban-Acree model, the 3,5-dibromo-4-Hydroxybenzaldehyde solubility was well mathematically described obtaining RAD values smaller than 3.71% and RMSD values smaller than 2.27 × 10-4. The Kamlet and Taft linear solvation energy relationships were employed to examine the chief factors describing solvent effect. The cavity formation energy of solvents played a significant role on the solubility variation of 3,5-dibromo-4-Hydroxybenzaldehyde in different aqueous solutions. The local mole fractions of ethanol/n-propanol/acetonitrile/DMF and water molecules around the 3,5-dibromo-4-Hydroxybenzaldehyde molecule were quantitatively studied via the Inverse Kirkwood–Buff integrals way used to the solubility values. 3,5-Bibromo-4-Hydroxybenzaldehyde was preferentially solvated by water in water-rich compositions for the ethanol/n-propanol/acetonitrile/DMF + water mixtures; while within co-solvent-rich and intermediate compositions, 3,5-dibromo-4-Hydroxybenzaldehyde was preferentially solvated by ethanol/n-propanol/acetonitrile/DMF.