Nano-structures of Cobalt Metal-Organic Complex (Co-MOC), [Co(NCS)2(L)(H2O)2.3(L)] {1} (L=2,5-dimethyl pyrazine), have been synthesized under different experimental conditions. Micrometric crystals (bulk) or nano-sized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by Scanning Electron Microscopy (SEM), Powder X-Ray Diffraction (PXRD), FT-IR spectroscopy, and elemental analyses. Single crystal X-ray analyses on 1 display that Co2+ ions are 6-coordinated and 0D coordination complex and two organic ligands (L) are not coordinated to Co(II) in the crystal lattice. Moreover, the impacts of the following parameters were investigated: ultrasonic power, reaction temperature, and reactant concentrations on structural and morphological features of the obtained materials. In the following step, the size of the nanomaterials was investigated based on SEM images. Finally, the intermolecular interaction of molecular crystals of 1 was also studied by Hirshfeld surface analysis.

The abundance of toxic contaminated effluents from the pharmaceutical industries and the serious risk of contamination of the aquatic systems combine to provide strong motivating factors to tackle this environmental problem. Use of non hazardous chemicals, reaction in aqueous medium is an interesting ecological alternative for the bulk production of important drugs and fine chemicals. Taking advantage of the remarkable ability of the selected catalytic systems, alternative sustainable methods have been exploited for the decontamination of industrial effluents and exhausts. Working in the same direction herein, we present a newly developed metal-organic complex [Bis(picolinate-κ2N:O) Cu(II)] catalysed A3-coupling reaction in water which has established an excellent greener protocol to yield propargylamine. Low toxicity, easy access to active sites, high surface area, high thermal stability, recyclability of the catalyst and easy way to separate the catalyst from the reaction mixture are the added advantage of this developed greener and sustainable protocol.

Todays, due to increasing population growth as well as increasing human demand, various industries are growing rapidly, which has led to a decrease in clean water, and as a result, the need to recycle water has become a priority. Dyes are complex organic compounds that are used in various industries. The nanostructures of magnetic metal-organic frameworks can be used as the main material for sustainable development and the elimination of environmental pollutants. These frameworks are intelligent due to the presence of magnetic nanoparticles and have been collected using an alternating external magnetic field, which can be reconstructed and regenerated. These magnetic composites can be used to control and isolate contaminants in the environment. The nanostructures of magnetic metal-organic frameworks, due to their easy synthesis and separation and their two attractive and destructive behaviors, high surface area, their rapid reaction with organic dyes and high efficiency, give a new generation of materials to industrial effluent treatment. In this study, an attempt has been made to investigate the nanostructures of magnetic metal-organic frameworks as well as their application as nano sorbents to remove organic dyes from industrial effluents.

In new technology fields, organic light emitting diodes (OLED) and the optimization of its components are of great interest. Organometallic complexes contain heavy metals, leading to the mixing of single and triple manifolds and increasing emission efficiency. For OLEDs to be useful in display applications, true red, green, and blue emissions of sufficient luminous efficiencies and proper chromaticity are required. The transition metals used to prepare emitting organometallic complexes are iridium, platinum, osmium and zinc (II). The development of these compounds depends on substitutions and organic structural units that are used as ligands. The results show that platinum and iridium have the best performance in preparing luminous organometallic complexes. In this article, a review of the recent progress in the development of organometallic compounds used in organic light-emitting diodes is highlighted. The preparation of optimal structure to achieve color purity and the development of the application of organometallic compounds will also be investigated.

In this research, zinc, calcium and cadmium organometallic nanostructures were synthesized as fluorescent materials for the application in organic light-emitting diodes (OLEDs). High luminescent ZnQ2, CaQ2, And CdQ2 organometallic nanostructures were synthesized by the simple precipitation method using 8- hydroxyquinoline ligand (8-hydroxyquinoline), cationic surfactant of trimethyl ammonium bromide (CTAB) and zinc, cadmium and cadmium salts. The crystalline and amorphous nature of ZnQ2, CdQ2 and CaQ2 organic-metal nanostructures was confirmed by X-ray diffraction (XRD). The synthesized organic-metal complex nanostructures were characterized using Fourier transform infrared (FT-IR) To determine functional groups and scanning electron microscope (SEM). Optical and luminescence properties of the complexes were analyzed by visible and ultraviolet (UV-Vis) and photoluminescence (PL) spectroscopy. The maximum Green-blue emission peaks were observed from ZnQ2, CdQ2, and CaQ2 nanostructures at 498, 488, and 494 nm, respectively. The optical and electronic studies of the samples show that the synthesized nanostructures can be used in liquid crystals displays (LCDs) as well as in light-emitting diodes as an emission and electron transport layers.

In continuation of our previous brief review of structural concepts of novel supramolecular proton transfer compounds and their metal complexes by Aghabozorg et al. [1], we briefly surveyed the current research in the field of proton transfer compounds supramolecular synthons and their self-assembled metallic complexes from the points of view of Crystal Engineering and Density Functional Theory (DFT) since 2008. Our research groups have recently focused on the proton delivery from acids, which are considered to be suitable proton donors, to amines as proton acceptors. The results were the production of several proton transfer ion pairs possessing some remaining donor sites applied for coordination to metal centers in the preparation of metal-organic compounds. Some of the complexes showed contributions of both cationic and anionic fragments of the starting ion pair, while some others contained only one of these species as ligand. Our review and investigation of compounds revealed that they mainly focused on the concept of supramolecular systems, co-crystallization, stereochemically active lone pairs, coordination polyhedron, mainly on the various interactions involved, including van der Waals, ion pairing, hydrogen bondings, face to face π-π stackings and edge to face C-H···π, C-O···π, N-H···π and S···S. These interactions were the most commonly used strategies in the extension of supramolecular structures.

Coordination polymers (CPs) are synthesized using bridging organic ligands and metal ions, depending on the geometric coordination of the metal, the bridging ligands, and the donor atoms present in these ligands, various one-, two-, or three-dimensional polymeric structures can form. To investigate the effect of the position of the pyridine nitrogen atom in the tridentate NN'O Schiff base ligand on the type of coordination polymers, two copper complexes were prepared. The ligand HL2 was characterized using IR, NMR, and elemental analysis, while the complexes were analyzed and identified using IR, elemental analysis, and X-ray diffraction techniques. The structural data of the copper complexes indicated that changing the pyridine nitrogen from position 3 to position 4 in the Schiff base ligand altered the structure of the copper complex from two-dimensional to three-dimensional. Analysis of inter- and intramolecular interactions using the NCI program shows that the interactions in both molecules are of the hydrogen bonding, halogen bonding, CH…π, π…π stacking, metal…π, and lone-pair…π type.

Nanoparticle-based magnetic solid phase microextraction (MSPME) has advanced in heavy metal ion concentration and speciation in recent years. This comprehensive review covers the latest developments in this field and their application to complex food samples. The review begins with conventional MSPE methods' challenges and constraints, then examines off-line and online MSPE formats. Later sections of the review examine solid phase extraction’s (SPE) use of magnetized inorganic nanomaterials. These include magnetic silica, alumina, titania, and layered double oxides. Magnetized carbonaceous nanomaterials, such as magnetic graphene and/or graphene oxides, carbon nanotubes, and carbon nitrides, also belong to this study. The study describes how magnetized organic polymers-non-imprinted and ion-imprinted improved SPE. Magnetized metal-organic frameworks (MOF), ionic liquids, and biosorbents are also covered briefly. Each section carefully examines nanomaterials' selectivity, sorption capacity, mechanisms of sorption, and synthesis routes. Nanomaterials are becoming key sorbents for toxic heavy metal extraction from food samples. Carbon nanomaterials (CNMs), magnetic nanoparticles (MNPs), nano-imprinted polymers (NIPs), nano-based metal-organic frameworks (N-MOFs), and silica nanoparticles (SiNPs) are leading preconcentration methods due to their high surface area, selectivity, rapid adsorption kinetics, and food contamination capture efficiency. The review emphasizes the importance of SPE and SPME, enhanced by nanomaterial sorbents and summarizes nanomaterial-infused solid phase extraction strategies and their impact on heavy metal extraction from food matrices. The review examines a variety of nanomaterials and their complex use to improve selectivity, extraction efficiency, and future research in this crucial area.

Organic acids exuded by plant roots increase solubility of soil micronutrient complexes. This study was carried out to evaluate adsorption isotherms of 4 acidic and 4 calcareous soils at presence of organic acids (citric, malic and oxalic acids). Iron sorption and desorption isotherms are defined in to two systems including; system 1; soil-water-metal, system 2; soil-water-organic acid-metal). Data fitted to different adsorption/desorption isotherms model including Langmuir (Cs= kbCe/ 1+kCe) and Frundlich (Cs=kCe1/n) and appropriate model developed for quantitative behavior of iron adsorption/desorption. The results showed that in acidic soils, Fe adsorption data fitted well with Frundlich (R2>0.98, P0.94, Poxalic acid>malic acid>control, respectively. It can be concluded that complexing organic acids with Fe decrease its adsorption and promote availability for plant.

Studing metal complexes of organic molecules has attracted great attention to explore the mechanisms of charge transfer through organometallic single molecules. In this work, we investigate the optoelectronic properties of diphenyl - bipyridine coordination chloride transition metal complex. By varying the transition metal in the group of Co, Cu, Fe, Mg, Ru and Zn atoms, we demonstrate the ability to manipulate the optical and electronic properties of the system. Density function theory (DFT) calculations with B3LYP functional are used to determine electronic properties of the metallo-molecules, including ionization potential, electronic affinity, energy gap, electronegativity, hardness, softness, and dipole moment. To understand the optical performance of the systems, we consider their absorption spectra in the ultraviolet and infrared regions, in the framework of time-dependent DFT. We argue that the six metallic atoms have the ability to tune the optoelectronic properties of the complex molecules.