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Journal ArticleDOI: 10.1080/00319104.2019.1698041

Binary and ternary nickel (II) complexes with 2-methylquinoline-8-carboxylic acid and some amino acids

04 Mar 2021-Physics and Chemistry of Liquids (Taylor & Francis)-Vol. 59, Iss: 2, pp 208-217
Abstract: In this work, the ligand 2-methylquinoline-8-carboxylic acid (HL) was prepared using a modification of a previous protocol, and its protonation constants were studied. The stability constants of th...

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Topics: Carboxylic acid (60%), Protonation (58%), Amino acid (52%)
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5 results found


Journal ArticleDOI: 10.1080/00319104.2020.1808656
Alba Paz1, Isis Caceres1, Yola Fakhri1, Yurgenis Henríquez2  +3 moreInstitutions (2)
Abstract: In this work, we present the results from a chemical speciation study of binary and ternary complexes formed by Ni(II) ion with picolinic acid and the amino acids = Arginine (HArg), Tryptophan (HTr...

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Topics: Picolinic acid (62%)

3 Citations


Journal ArticleDOI: 10.1080/00319104.2020.1793334
Abstract: In this work, we report the results of a speciation study on the ternary complexes present in the systems formed by Ni(II) ion, 8-hydroxyquinoline (8-HQ) and the amino acids = α-alanine (HαAla), β-...

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Topics: Ternary operation (53%)

2 Citations


Journal ArticleDOI: 10.1080/00319104.2021.1949011
Yoselin Jara1, Mary Lorena Araujo2, Waleska Madden1, Vito Lubes1  +1 moreInstitutions (2)
Abstract: In this work we report the results of a speciation study on the ternary complexes present in the ternary Ni(II)- 1,10 phenanthroline (Phen)-amino acids and Ni(II)- 2,2-bipyridine (Bipy)-amino acids...

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Topics: 2,2'-Bipyridine (60%), Phenanthroline (60%), Ternary complex (59%) ... read more

1 Citations


Journal ArticleDOI: 10.1080/10406638.2020.1871036
Alparslan Atahan1Institutions (1)
Abstract: The title polyaromatic chalcone compound (PyMQ-chalcone) was sequentially synthesized via a three steps synthetic procedure and well characterized. Structural illumination was achieved by 1D and 2D...

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Topics: Chalcone (63%)

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13 results found


Journal ArticleDOI: 10.1016/S0010-8545(98)00260-4
Lucia Alderighi1, Peter Gans2, Andrea Ienco1, Daniel Peters  +2 moreInstitutions (2)
Abstract: Hyperquad simulation and speciation (HySS) is a computer program written for the Windows operating system on personal computers which provides (a) a system for simulating titration curves and (b) a system for providing speciation diagrams. The calculations relate to equilibria in solution and also include the possibility of formation of a partially soluble precipitate. There are no restrictions as to the number of reagents that may be present or the number of complexes that may be formed.

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1,278 Citations


Journal ArticleDOI: 10.1351/PAC200173111795
Abstract: A unified scale is recommended for reporting the NMR chemical shifts of all nuclei relative to the 1 H resonance of tetramethylsilane (TMS The unified scale is designed to provide a precise ratio, Ξ, of the resonance frequency of a given nuclide to that of the primary reference, the 1 H resonance of TMS in dilute solution (volume fraction, φ < 1%) in chloroform. Referencing procedures are discussed, including matters of practical application of the unified scale. Special attention is paid to recommended reference samples, and values of Ξ for secondary references on the unified scale are listed, many of which are the results of new measurements. Some earlier recommendations relating to the reporting of chemical shifts are endorsed. The chemical shift, δ, is redefined to avoid previous ambiguities but to leave practical usage unchanged. Relations between the unified scale and recently published recommendations for referencing in aqueous solutions (for specific use in biochemical work) are discussed, as well as the special effects of working in the solid state with magic-angle spinning. In all, nine new recommendations relating to chemical shifts are made. Standardized nuclear spin data are also presented in tabular form for the stable (and some unstable) isotopes of all elements with nonzero quantum numbers. The information given includes quantum numbers, isotopic abundances, magnetic moments, magnetogyric ratios and receptivities, together with quadrupole moments and line-width factors where appropriate.

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Topics: Chemical shift (50%)

926 Citations


Open accessJournal ArticleDOI: 10.1107/S0108767303005488
Abstract: A novel and general approach to scaling diffraction intensities is presented. The method minimizes the disagreement among multiple measurements of symmetry-related reflections using a stable refinement procedure. The scale factors are described by a flexible exponential function that allows different scaling corrections to be chosen and combined according to the needs of the experiment. The scaling model presented here includes: scale and temperature factor per batch of data; temperature factor as a continuous function of the radiation dose; absorption in the crystal; uneven exposure within a single diffraction image; and corrections for phenomena that depend on the diffraction peak position on the detector. This scaling model can be extended to include additional corrections for various instrumental and data-collection problems.

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Topics: Scaling (59%), Diffraction (54%), Scale factor (54%) ... read more

630 Citations


Journal ArticleDOI: 10.1016/J.EJMECH.2016.05.007
Valentina Oliveri1, Graziella Vecchio1Institutions (1)
Abstract: 8-Hydroxyquinolines are heterocyclic compounds characterized by a moderate metal-binding affinity. The interest in 8-hydroxyquinolines has grown exponentially in the last two decades as they are privileged structures for the design of new drug candidates that exert a host of biological effects on various targets. The study of biological activities such as neuroprotection, anticancer, antibacterial, antifungal activity has been further promoted by the synthetic versatility of 8-hydroxyquinoline, which allows the generation of a large number of derivatives. These include numerous multifunctional analogues having the metal-binding motif of 8-hydroxyquinoline. In this review, we have summarized 8-hydroxyquinolines, 8-hydroxyquinoline-like compounds, 8-hydroxyquinoline-loaded nanoparticle systems with respect to their biological activities, interaction with metal ions and mechanisms of action.

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Topics: Hydroxyquinolines (55%)

146 Citations


Journal ArticleDOI: 10.1126/SCIENCE.7754394
Stephen J. Lippard1Institutions (1)
19 May 1995-Science
Topics: Crystal structure (50%)

83 Citations