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Oyetunde T, Masikane S, Khan MD, Akerman MP, Görls H, Revaprasadu N, Plass W. Precursor Engineering for the Synthesis of Mixed Anionic Metal (Cu, Mn) Chalcogenide Nanomaterials via Solvent-Less Synthesis. Inorg Chem 2022; 61:6612-6623. [PMID: 35436112 DOI: 10.1021/acs.inorgchem.2c00460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metal-organic ligands with mixed chalcogenides are potential compounds for the preparation of mixed anionic metal chalcogenide alloys. However, only a few of such ligands are known, and their complexes are not well explored. We have prepared homo- and hetero-dichalcogenoimidodiphosphinate [(EE'PiPr2NH)] (E, E' = Se, Se; S, S; S, Se) complexes of manganese and copper through metathetical reactions. The X-ray single crystal structure of [Mn{(SePiPr2)2N}2] 1 revealed a triclinic crystal system, with a MnSe4 core unit, whereas the crystal structure determination of [Mn{(SPiPr2)(SePiPr2)N}2] 2 indicated a triclinic crystal system with a Mn(S/Se)2 unit. Both metal centers are tetrahedral, with two deprotonated bidentate ligands forming the coordination sphere. The free ligand was found to exhibit a gauche configuration in the solid state. The energies of the various rotamers of dithio-analogue were studied by DFT calculations. The decomposition behavior of complexes with homo- and heterochalcogenides was investigated, and the complexes were employed as single-source precursors to generate manganese and copper chalcogenides through solvent-less melt reactions between 500 and 550 °C. The deposited powders were characterized by powder X-ray diffraction (p-XRD), scanning electron microscopy (SEM), energy dispersive analysis of X-ray (EDAX), transmission electron microscopy (TEM), and elemental mapping. MnS, MnSe2, and MnSSe phases were obtained from the decomposition of respective manganese complexes. In contrast, the decomposition of copper-based complexes yielded Cu2-xSe and the sulfur-doped Cu3Se2 phase from seleno- and mixed thio/seleno-complexes of Cu, respectively. The morphology ranged from random sheet-like structures to agglomerated platelets, while the selected area electron diffraction (SAED) revealed the crystalline nature of the materials. Depending on the nature of the complex and the temperature, different amounts of phosphorus were present as an impurity in the synthesized products.
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Affiliation(s)
- Temidayo Oyetunde
- Centre for Chemical and Biochemical Research (CCBR), Redeemer's University, Ede, P.M.B. 230, Ede, Osun State 232102, Nigeria.,Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, Jena D-07743, Germany
| | - Siphamandla Masikane
- Chemistry Department, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa
| | - Malik Dilshad Khan
- Chemistry Department, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa.,Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
| | - Matthew P Akerman
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg 3201, South Africa
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, Jena D-07743, Germany
| | - Neerish Revaprasadu
- Chemistry Department, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, Jena D-07743, Germany
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Exploring the binding interactions of structurally diverse dichalcogenoimidodiphosphinate ligands with α-amylase: Spectroscopic approach coupled with molecular docking. Biochem Biophys Rep 2020; 24:100837. [PMID: 33251341 PMCID: PMC7677685 DOI: 10.1016/j.bbrep.2020.100837] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Revised: 10/14/2020] [Accepted: 10/15/2020] [Indexed: 01/13/2023] Open
Abstract
Postprandial hyperglycemia has orchestrated untimely death among diabetic patients over the decades and regulation of α-amylase activity is now becoming a promising management option for type 2 diabetes. The present study investigated the binding interactions of three structurally diverse dichalcogenoimidodiphosphinate ligands with α-amylase to ascertain the affinity of the ligands for α-amylase using spectroscopic and molecular docking methods. The ligands were characterized using 1H and 31P NMR spectroscopy and CHN analysis. Diselenoimidodiphosphinate ligand (DY300), dithioimidodiphosphinate ligand (DY301), and thioselenoimidodiphosphinate ligand (DY302) quenched the intrinsic fluorescence intensity of α-amylase via a static quenching mechanism with bimolecular quenching constant (Kq) values in the order of x1011 M-1s-1, indicating formation of enzyme-ligand complexes. A binding stoichiometry of n≈1 was observed for α-amylase, with high binding constants (Ka). α-Amylase inhibition was as follow: Acarbose > DY301>DY300>DY302. Values of thermodynamic parameters obtained at temperatures investigated (298, 304 and 310 K) revealed spontaneous complex formation (ΔG<0) between the ligands and α-amylase; the main driving forces were hydrophobic interactions (with DY300, DY301, except DY302). UV–visible spectroscopy and Förster resonance energy transfer (FRET) affirmed change in enzyme conformation and binding occurrence. Molecular docking revealed ligands interaction with α-amylase via some key catalytic site amino acid residues (Asp197, Glu233 and Asp300). DY301 perhaps showed highest α-amylase inhibition (IC50, 268.11 ± 0.74 μM) due to its moderately high affinity and composition of two sulphide bonds unlike the others. This study might provide theoretical basis for development of novel α-amylase inhibitors from dichalcogenoimidodiphosphinate ligands for management of postprandial hyperglycemia. Interaction of α-amylase with dichalcogenoimidodiphosphinate ligands was studied. Spectroscopy and molecular docking explored the interaction mechanisms. The main driving forces were hydrophobic interactions with DY300 and DY301. The ligands quenched α-amylase fluorescence intensity by static mechanism. Dichalcogenoimidodiphosphinate ligands inhibited α-amylase activity.
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Flores-Romero V, García-Guzmán OL, Aguirre-Bautista A, Rojas-Montoya ID, García-Montalvo V, Rivera M, Jiménez-Sandoval O, Muñoz-Hernández MÁ, Hernández-Ortega S. Zinc( ii) and cadmium( ii) complexes, [M( iPr 2P(X)NC(Y)NC 5H 10-κ 2-X,Y) 2] (X and Y = O, S), as single source precursors for metal sulfide thin films. NEW J CHEM 2020. [DOI: 10.1039/d0nj01465f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural, morphological and optical studies of zinc and cadmium sulfide thin films with different contents of phosphorus.
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Affiliation(s)
- Víctor Flores-Romero
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Cd Mex
| | - Oscar L. García-Guzmán
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Cd Mex
| | | | - Iván D. Rojas-Montoya
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Cd Mex
| | - Verónica García-Montalvo
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Cd Mex
| | - Margarita Rivera
- Instituto de Física
- Dpto. Materia Condensada
- Universidad Nacional Autónoma de México
- Ciudad Universitaria
- Mexico
| | - Omar Jiménez-Sandoval
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional
- Unidad Querétaro
- Apartado Postal 1-798
- Querétaro
- Mexico
| | | | - Simón Hernández-Ortega
- Instituto de Química
- Universidad Nacional Autónoma de México
- Circuito Exterior
- Ciudad Universitaria
- Cd Mex
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