Catalytic promiscuity of mononuclear copper(II) complexes in mild conditions: Catechol and cyclohexane oxidations

Hydrolysis of phosphate diester catalyzed by new mononuclear copper(II) complexes containing selenium ligands

“…The E 1/2 potential values (vs NHE) found are considerably high-more than 0.3 V-when compared with copper(II) complexes containing only oxygen or nitrogen as donors in the ligands, such as imines, amines, and phenol, which have more negative redox potential. 29,[33][34][35] However, these values are in agreement with other complexes containing selenium ligands. 18,36 Among complexes 1-3, the narrow difference between the E 1/2 can be attributed to the effect of the substituents on the ligands, which, when altering the electronic density of the donor atom, consequently, alters the electronic density of the metallic center.…”

Investigations on a mononuclear Cu(ii) Schiff base complex: theoretical calculations, catechol oxidase activity, and protein binding interaction analysis

“…23,24 Among all the inorganic transition metal ions copper(II)-containing compounds with an advanced mode of design have been explored for various catalytic activities, protein-complex binding studies, proteins and the role of catechol oxidases is to catalyze the oxidation of catechols to orthoquinones in the presence of air. [32][33][34][35][36][37][38][39][40][41] Catechol is present in small quantities in the vacuoles and cytoplasm of the plant cell. If any bacterial or fungal diseases occur in plant tissues, catecholase enzyme is immediately released and converts catechol to ortho-quinone; therefore, it is known as a natural antiseptic.…”

“…30,31 In particular, catechol oxidases are type III copper proteins and the role of catechol oxidases is to catalyze the oxidation of catechols to ortho quinones in the presence of air. 32–41 Catechol is present in small quantities in the vacuoles and cytoplasm of the plant cell. If any bacterial or fungal diseases occur in plant tissues, catecholase enzyme is immediately released and converts catechol to ortho -quinone; therefore, it is known as a natural antiseptic.…”

An unusual partial occupancy of labile chloride and aqua ligands in cocrystallized isomers of a nickel(II) complex bearing a tripodal N 4-donor ligand

“…In the last two decades, our group and others have exploited mononuclear first-row transition-metal complexes containing two labile cis ligands as biomimetic or bio-inspired homogeneous catalysts for a great variety of reactions, such as the oxidation of catechol and cyclohexane (Ferre et al, 2017), the hydrolysis of proteins (Oliveira et al, 2009), phosphodiesters (Scarpellini et al, 2003;Kettenmann et al, 2018) and polysaccharides (Concia et al, 2017), and, more recently, water splitting (Luo et al, 2016). They have also been studied as prodrugs and carrier prototypes for the selective delivery of bioactive substances (Pires et al, 2016;de Souza et al, 2016).…”