A one-dimensional polyoxometalate-based polymer [Cu(DMF)₆][PMo(V)Mo(VI)₁₁O₄₀Cu(DMF)₄]·DMF: crystal structure and luminescent properties

A Comprehensive Review on the Importance of Sustainable Synthesized Coinage Metal Nanomaterials and Their Diverse Biomedical Applications

From a historical perspective, coinage metals (CMNMs) are most renowned for their monetary, ornamental, and metallurgical merits; nevertheless, as nanotechnology's potential has only just come to light, their metal nanostructures and uses may be viewed as products of modern science. Notable characteristics of CMNMs include visual, electrical, chemical, and catalytic qualities that depend on shape and size. Due diligence on the creation and synthesis of CMNMs and their possible uses has been greatly promoted by these characteristics. This review focuses on solution-based methods and provides an overview of the latest developments in CMNMs and their bimetallic nanostructures. It discusses a range of synthetic techniques, including conventional procedures and more modern approaches used to enhance functionality by successfully manipulating the CMNMs nanostructure's size, shape, and composition. To help with the design of new nanostructures with improved capabilities in the future, this study offers a brief assessment of the difficulties and potential future directions of these intriguing metal nanostructures. This review focuses on mechanisms and factors influencing the synthesis process, green synthesis, and sustainable synthesis methods. It also discusses the wide range of biological domains in which CMNMs are applied, including antibacterial, antifungal, and anticancer. Researchers will therefore find the appropriateness of both synthesizing and using CMNMS keeping in mind the different levels of environmental effects.

EXAFS Study on the Coordination Chemistry of the Solvated Copper(II) Ion in a Series of Oxygen Donor Solvents

The structures of the solvated copper(II) ion in water and nine organic oxygen donor solvents with similar electron-pair donor ability, but with different space-demanding properties at coordination, have been studied by EXAFS. N,N′-Dimethylpropyleneurea and N,N,N′,N′-tetramethylurea are sufficiently space demanding at coordination to make the axial positions not accessible, resulting in square-planar copper(II) solvate complexes with an intense green color. The mean Cu–O bond distances in these two solvate complexes are 1.939(3) and 1.935(3) Å, respectively. The best fits of the remaining solvates, which are light blue in different hues, are obtained with a Jahn–Teller distorted-octahedral model consisting of four strongly bound solvent molecules in the equatorial positions at 1.96(2) Å and two in the axial positions but with different Cu–O_ax bond distances: ca. 2.15 and 2.32 Å. This is in agreement with observations in solid-state structures of compounds containing hexaaquacopper(II) complexes crystallizing in noncentrosymmetric space groups and all reported crystal structures containing a [Cu(H₂O)₅(O-ligand)] complex with Jahn–Teller distortion. Such a structure is in agreement with previous EPR and EXAFS studies proving the hydrated copper(II) ion to be a noncentrosymmetric complex in aqueous solution. The refinements of the EXAFS data of the solids [Cu(H₂O)₆](ClO₄)₂, [Cu(H₂O)₆](BrO₃)₂, [Cu(H₂O)₆]SiF₆, Cu(NO₃)₂·2.5H₂O, and CuSO₄·5H₂O gave Cu–O bond distances significantly different from those reported in the crystallographic studies but similar to the configuration and bond distances in the hydrated copper(II) ion in aqueous solution. This may depend on whether the orientation of the axial positions is random in one or three dimensions, giving a mean structure of the solid with symmetry higher than that of the individual complexes. This study presents the very first experimental data from the new X-ray absorption spectroscopy beamline Balder at the MAX IV synchrotron radiation facility in Lund, Sweden, as well as the utilized properties of the beamline.

The coordination chemistry of the solvated copper(II) ion has been studied in 10 solvents, including water. The copper(II) ion has a noncentrosymmetric Jahn−Teller distorted-octahedral geometry with the axial Cu−O bond distances differing by ca. 0.2 Å.

A polyoxometalate-based inorganic-organic hybrid polymer constructed from silver-Schiff base building block and Keggin-type cluster: Synthesis, crystal structure and photocatalytic performance for the degradation of rhodamine B

One polyoxometalate-based inorganic-organic hybrid polymer [Ag3L4(PMo12O40)(CH3OH)]·CH3OH (1), where L is N,N'-bis(furan-2-ylmethylene)hydrazine, has been synthesized at room temperature and structurally characterized by infrared spectroscopy, ultraviolet-visible spectroscopy, elemental analysis, X-ray powder diffraction and X-ray single-crystal crystallography. The structure of 1 exhibits a crystalline one-dimensional polymer constructed by the connections of Keggin-type [PMo12O40](3-) anions and [Ag3L4](3+) units, in which each Ag(I) center adopted a distorted square pyramidal environment. The spectroscopic experiments show that polymer 1 not only is potential semiconductor materials but also displays the obvious photocatalytic performance for the degradation of rhodamine B.

One new dicoumarol-based fluorescent compound: synthesis, crystal structure and metal ions recognition

A new dicoumarol-based compound (C6H4)[CH2NHCO(C9O2H4)N(C2H5)2]21 was synthesized and characterized by IR, UV spectroscopy and single-crystal X-ray diffraction analysis. The structure of 1 exhibits a transoid formation with the two coumarin-containing arms sited on the two sides of the center benzene ring. In the crystal packing the molecule further interact with each other and form a three-dimensional framework through π-π stacking interactions and multiform hydrogen bonds. The compound 1 shows the main emission peak at 540 nm corresponding to the green hue in the solid state. The fluorescence recognition behaviors for various metal ions were investigated and 1 exhibits a highly fluorescence-quenching selectivity for Fe(III) ion in the mixed CH3CN-H2O solvent.

Assembly of one novel polyoxometalate-based inorganic-organic compound from copper-Schiff base building block: synthesis, crystal structure and spectral properties

A novel copper(II) inorganic-organic hybrid compound [CuL(DMF)(CH(3)OH)](2)(PMo(V)Mo(VI)(11)O(40))·2DMF (L=phenyl 2-pyridyl ketone azine) 1 has been synthesized and characterized by IR, UV, elemental analysis and X-ray crystallography. Cu(II) atom has a distorted square pyramidal environment interconnecting with N(3)O(2) donor set. In solid-state there are three types of C-H···π interactions between adjacent [CuL(DMF)(CH(3)OH)](2+), which generate a two-dimensional (2D) layer. Adjacent 2D layers form porous channels in which polyoxoanions as templates are filled. Simultaneously, the oxygen atoms of polyoxoanion as electron acceptors feather multiple intermolecular hydrogen bonds, through which giving rise to a 3D supramolecular network. The luminescent properties of the compound 1 were investigated in the solid state and in aqueous solution at room temperature, respectively.

Two copper(II) complexes with 4-benzoylpyridine ligand: synthesis, crystal structure and luminescent properties

Two new copper(II) complexes Cu(NCS)2(4-Bzpy)2 (1) and Cu(NO3)2(4-Bzpy)4 (2) (4-Bzpy=4-benzoylpyridine) have been synthesized and characterized by IR, UV, elemental analysis and X-ray crystallography. Cu(II) atom has a square planar environment for 1 and an distorted octahedral environment for 2, respectively. In solid state there are C-H⋯π interactions and C-H⋯S hydrogen bonds between adjacent molecules in complex 1. The molecule of complex 2 is further connected by multiform π-π interactions, C-H⋯π interactions and C-H⋯O hydrogen bonds to form a three-dimensional supramolecular structure. The luminescent properties of the complexes 1 and 2 were both investigated in H2O solution and in solid state at room temperature, respectively.