Comparative study on the coordination chemistry of cobalt(II), nickel(II), and copper(II) with derivatives of salen and tetrahydrosalen: metal-catalyzed oxidative dehydrogenation of the carbon-nitrogen bond in coordinated tetrahydrosalen

Synthesis, characterization and structural studies of binuclear nickel(II) complexes derived from dihydroxybenzaldehyde thiosemicarbazones, bridged by 1,2-bis(diphenylphosphino)ethane

“…The prepared complexes were found to be solid, insoluble in water but they were soluble in some organic solvents such as dimethylformamide and dimethylsulfoxide. The magnetic moment values of all nickel(II) thiosemicarbazone complexes in the crystalline state show diamagnetic nature and the results are in accordance with a square planar geometry for d 8 system (Boettcher et al, 1993).…”

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H4]salen and [H2]salen complexes

“…The similar effects of encapsulation and hydrogenization on the [H 2 ] and [H 4 ] complexes were observed by Yang et al in the aerobic epoxidation of styrene [6]. Methanol to the system probably retarded radicals [36,37] thus the selectivity was high when using (80% H 2 O 1 20% CH 3 OH) as the solvent (Table 2). Cu ([H 4 ]salen)/SB was proved to be most active when methanol was added to the system as giving the highest conversion per mole metal ion and selectivity.…”

“…Results as shown in Table 2 showed that solvent was more encapsulation dependence, whereas the effect of hydrogenation was relatively insignificant. It is considered that several factors are responsible for it: the use of methanol for solvolysis of lignin ethers or capping radicals or reaction with these disrupted linkages and affecting lignin depolymerization [34]; the cobalt loading; the differences in the location, interaction with the NaY framework and accessibility [35]; the presence of uncomplexed metal ions [36]; the differences in the siteisolation of complex and discretization of active species between encapsulation and hydrogenation [37].…”

Synthesis, characterisation and antifungal activity of a series of Cobalt(II) and Nickel(II) complexes with ligands derived from reduced N, N′-o-Phenylenebis(Salicylideneimine)

“…The comparison of the ligand coordinating properties of reduced Schiff bases with their Schiff base parents showed that the basicity of N atoms is enhanced and also a greater flexibility as consequence of the hydrogenation of the C=N bond, leading to more stable complexes [8][9][10][11]. For these reasons, the reduced Schiff bases have gained particular attention [12,13].…”