Water-soluble Cu(II)-complexes of Schiff base amino acid derivatives as biological reagents and sufficient catalysts for oxidation reactions

Synthesis of Novel Aqua ƞ4-NNNO/Cu(II) Complexes as Rapid and Selective Oxidative Catalysts for O-Catechol: Fluorescence, Spectral, Chromotropism and Thermal Analyses

“…Copper complexes containing Schiff bases have been applied in catalytic oxidation of various types of chemical compounds including hydrocarbons [35], cyclooctene and benzylic alcohols [36][37][38]. However, the conversion rates and ease of experimental conditions were not optimum when compared to the process we report in the current work, where complete conversion of o-catechol to o-benzoquinone has been achieved in a very short time and under mild reaction conditions.…”

“…Increasing the temperature of catalytic conversion reaction from room temperature to 50 °C allowed an increase in the conversion rate and at the same time a reduction in reaction time by half (Trial 6), while the TOF was increased further by a factor of 10 at 70 It is worth mentioning that plenty of sustainable catalytic oxidation reactions have been performed in the presence of molecular oxygen and hydrogen peroxide as oxidants [31]. However, peroxide is largely used for having higher oxidation potential than oxygen [31][32][33][34][35][36][37][38]. Initially the catalytic oxidation of o-catechol to o-benzoquinone was perused using UV-Vis spectroscopy, in which in the recorded absorbance values at 358 nm of the o-benzoquinone were time dependent, measured every one minute for 20 min using complex 3 (Figure 11).…”

Two ionic oxo‐vanadate and dioxo‐molybdate complexes of dinitro‐aroylhydrazone derivative: Effective catalysts for epoxidation reactions, biological activity, ctDNA binding, density functional theory, andin silicoinvestigations

“…[ 38 ] The polarity of the central metal ion is significantly diminished after bonding with the hydrazone ligand donor atoms, enhancing its lipophilic character. [ 55 ] Therefore, the presence of the central metal ion enhances the overall penetrating ability of the complexes through the microbes' cell wall membranes compared to the free ligand. Subsequently, M‐chelates could therefore inhibit microbial growth by disturbing and blocking the respiration process.…”

“…The distinguished changes in the particular free ctDNA viscosity and with HLZNa, VOLZNa, or MoO 2 LZNa could aim to understand the degree of the binding strength using equations and . [ 55 ] In addition, EB was applied as a standard interacting agent (positive control) with ctDNA to compare its reactivity with the studied compounds (HLZNa, VOLZNa, and MoO 2 LZNa) depending on the measured improvement in the viscosity of ctDNA solution. The more progressive interaction of HLZNa, VOLZNa, or MoO 2 LZNa with ctDNA could be attributed to the enhanced ctDNA viscosity, particularly with the increase in the studied compound concentrations, as shown in Figure 6.…”

“…Both B and C complex intermediates were treated to reduce energy content and assess intermediate stability to track the mechanism step by step. [ 55 ] The spectroscopic scan changes in MoO 2 LZNa with 1,2‐cyclooctene in the presence and absence of H 2 O 2 in the reaction media of AN at 50 °C (15 min for 6 h) were recorded and used for practical elucidation of the mechanism (Scheme 4). Here we estimated the theoretical aspects that facilitated the catalysis success of the MoO 2 LZNa complex in the alkene epoxidation process with H 2 O 2 as follows: The big size of Mo(VI) ion (4d element) according to its ionic radii recorded (73 pm), compared to that of the radii of V(IV) ion (72 pm), 3d‐element, enhanced its associative mechanism of the reaction.…”