The prepared unsymmetrical α-diimine nickel precatalysts demonstrated exceptional performance at higher temperatures (act. 2.4 × 10⁶ g mol⁻¹ h⁻¹ at 100°C, M _w = 10⁵ g mol⁻¹, Ð = ≈1.5, branches 97–142/1000C). Excellent tensile strength and strain recovery of polyethylene highlight characteristic properties of thermoplastic elastomers.

The properties and practical applications of polyethylene are closely associated with the polymer molecular weight, polydispersity, degree of branching, and the type of branches and its arrangement within microstructure. In this study, a set of structurally diverse unsymmetrical 1-(2,6-dibenzhydryl-4-hydroxylphenylimino)-2-(2,6-(R)-4-(R¹)phenylimino)acenaphthene-nickel dibromide precatalysts (where Ni ^2Me [R = Me, R¹ = H], Ni ^2Et [R = Et, R¹ = H], Ni ^2iPr [R = iPr, R¹ = H], Ni ^3Me [R, R¹ = Me], Ni ^2Et,Me [R = Et, R¹ = Me]) has been prepared and studied for ethylene polymerization. Molecular structure analysis of Ni ^2Me and Ni ^2Et complexes revealed distorted tetrahedral geometries at nickel. The polymerization activities are extremely high for all precatalysts upon activation with either EASC or MMAO aluminum reagents, a trend notably pronounced in the case of the EASC-activated systems, entering activity in the range of 10 million g mol⁻¹ h⁻¹ at 30°C. The Ni ^2Me demonstrated exceptional performance at higher temperatures, achieving an activity of 2.4 × 10⁶ g mol⁻¹ h⁻¹ at 100°C and generated high molecular weight polyethylene (M _w = 10⁵ g mol⁻¹) with narrow polymer dispersity across all reaction temperatures (Ð ≈ 1.5). High temperature ¹³C NMR spectra identified 97–142/1000C branches in resulting polyethylene, a feature significantly dependent on the reaction temperature. In terms of mechanical properties, stress–strain analysis indicated that polyethylene synthesized at lower temperatures displayed superior tensile strength compared with that produced at higher reaction temperatures, while a reverse trend was observed in strain recovery analysis. The high strain recovery (up to 72%) of these polyethylene highlights the characteristic properties of thermoplastic elastomers.

The mesoporous KIT-6 was modified using 3,4-diaminobenzophenone, and further, a new complex of copper was immobilized on its surface (KIT-6@DABP@Cu) as an organometallic and nanocatalyst in the selective synthesis of 5-substituted tetrazoles. This catalyst was identified with FT-IR, WDX, AAS, XRD, SEM, TGA, EDX, and BET techniques. KIT-6@DABP@Cu nanocatalyst was demonstrated highly effective and good reusability in the synthesis of 5-substituted tetrazoles.

In this article, the mesoporous silica framework of KIT-6 was synthesized and, then its surface was modified using 3-aminopropyltrimethoxysilane (APTMS). The new KIT-6@DABP@Cu nanocatalyst was then prepared by anchoring the copper complex on modified mesoporous KIT-6. The nanocatalyst was identified using several techniques, including FT-IR, WDX, AAS, SEM, TGA, XRD, EDS, and BET. The physical properties, such as size, shape, and morphology of the nanocatalyst were studied by SEM analysis. The elemental composition of KIT-6@DABP@Cu nanocatalyst was described using wavelength dispersive X-ray spectroscopy (WDX) and EDS. FT-IR spectroscopy was used to characterize the functional groups in the structure of the nanoparticles. The stability of KIT-6@DABP@Cu nanocatalyst was studied by TGA at high temperatures. Also, the surface area, total volume, and average diameter of pores of the nanocatalyst were determined using Brunauer–Emmett–Teller (BET) analysis. The KIT-6@DABP@Cu catalyst was found to be a new, highly effective, and green catalyst for the synthesizing of 5-substituted-tetrazoles using nitriles and sodium azide (NaN₃) catalyzed in polyethyleneglycol-400 (PEG-400) as a green solvent. This heterogeneous catalyst showed good recyclability for up to five consecutive cycles without notable loss of its catalytic efficiency.

Cu²⁺ and Zn²⁺ complexes of malonyl dihydrazone derivative are synthesized and characterized.

The antimicrobial (bacteria and fungi) and anticancer potential of M-complexes and their ligand are examined. Their binding to ctDNA is examined via UV–Visible spectroscopy and hydrodynamic measurements. Cu²⁺ and Zn²⁺ complexes have more biological reactivity over their free ligand based the role of metal ion of the Tweedy's chelation theory. Their catalytic reactivity was examined in the epoxidation of 1,2-cyclohexene with H₂O₂, in which they assigned high catalytic performance.

According to the interesting reactivity of arylhydrazones in coordination chemistry and biological assays, malonyl dihydrazone ligand of diisatin derivative (H₂Lm) was reacted with Cu²⁺ and Zn²⁺ ions forming two complexes of dinuclear homoleptic mode (CuLm and ZnLm, respectively). Demonstration of their chemical structures was confirmed through various spectroscopic ways alongside the elemental analyses (EA), conductivity measurements, and magnetic characteristics.

Their bio-performance was recorded based on their inhibited potential of the growing ability of some common bacteria, fungi, and human cancer/normal cell lines. The biological studies appointed the role and job of M²⁺ ion = Cu²⁺ or Zn²⁺ in its chelated MLm complex to perform the bio-reactivity over the free ligand, H₂Lm. Moreover, their interacted modes with ctDNA (i.e., calf thymus DNA) were examined via the viscometry and spectrophotometric titration. Because the two chelates (CuLm and ZnLm) represented an attractive job for the inhibited action against the current microorganisms and the human cancer/normal strains' growth over the free H₂Lm ligand, CuLm and ZnLm complexes displayed a distinguished interaction with ctDNA more than that of their uncoordinated H₂Lm ligand. From the values of binding constant (K _b) and Gibb's free energy ( ∆Gb≠$$ \Delta {G}_b^{\ne } $$), CuLm assigned more bio-action within ctDNA more than ZnLm H₂Lm ligand, referring to the role of Cu²⁺ ion with more electronegativity to enhance the reactivity of CuLm over their free H₂Lm ligand and ZnLm.

The catalytic behavior of CuLm and ZnLm was given within the epoxidation of 1,2-cyclohexene (an example of unsaturated hydrocarbons) homogeneously using hydrogen peroxide (the oxidant). Their catalytic action was optimized through various temperatures, solvents, time, and type of M²⁺ ion in the catalyst.