Complexes of “late” transition metals of the 3d row based on functionalized o-iminobenzoquinone type ligands: Interrelation of molecular and electronic structure, magnetic behaviour

Spin transitions in ferric catecholate complexes mediated by outer-sphere counteranions

“…Metal complexes with redox-active ligands are attracting considerable attention from scientists in the last 40 years. [1][2][3][4][5] It is caused by the unique ability of such types of ligands, being coordinated to the metal center, to change their oxidation state reversibly. Redox-active ligands can be used as reservoirs of electrons, for designing highly-active catalysts for bondforming or bond-breaking chemical reactions, [6][7][8][9][10] for generating ligand-centered radicals applied in the directed preparation of polyspin systems-building blocks of molecular magnets.…”

Heteroligand Metal Complexes with Extended Redox Properties Based on Redox-Active Chelating Ligands of o-Quinone Type and Ferrocene

“…Further study of such model systems will provide information on the influence of various factors on redox processes, including the electron transfer process, which is a fundamental stage of many chemical reactions and is of crucial importance in many catalytic and biochemical processes, including photosynthesis, respiration, the transmission of nerve impulses, etc. L R -ferrocenyl-containing β-ketoiminate ligand 13--14 [111,112] (Fc-C 6 H 4 -CH=CH)Ru(acac-R)(PiPr 3 ) 2 (CO) acac-R-disubstituted β-diketonate ligand 14 [113] RR' Fc-CH=CH-PTF PTF-perchlorotriphenylmethyl radical 15 [114][115][116][117] (L N4 -Fc)Ni (Fc-L N4 -Fc)Ni L N4 -Fc and Fc-L N4 -Fc-mono-and diferrocenyl-containing macrocyclic ligands based on dibenzo [1,4,8,11]tetraazacyclotetradecines 15 [118] FcS 4 dt(Me) 2 and FcS 4 dt[Pt(t-Bu 2 bpy)] FcS 4 dt(Me) 2 -1,1 -ferrocenyl-containing redox-active dithiolene type ligand 16 [119] (pFlip)Pd pFlip-ferrocene-containing bis-o-aminophenol 16 [120] ferrocenyl-amide-p-benzoquinone -17 [128] ferrocenyl-acetylene-benzodioxines -17 [123] ferrocenyl…”

“…J.-R. Hamon et al [87,89] used the condensation reaction of 2-aminophenol and the corresponding ferrocenylacetone to obtain and characterize (using IR-, 1 A completely different picture is observed for a series of bi/trinuclear neutral asymmetric copper and nickel complexes based on ferrocene-containing Schiff base ligands (Scheme 12) [93][94][95]. In this case, the strong electronic interaction between two organometallic centres (Fe-Ru), namely, between the ferrocenyl group and the electron-withdrawing mixed-ligand ruthenium sandwich structure through the π-conjugated macrocyclic organometallic bridge [(L ONNO )Ni], is observed.…”

“…Currently, the coordination chemistry of redox-active compounds is attracting a lot of attention from various research groups worldwide [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Such growing attention is caused by the fact that unlike "classical" ligands, redox-active ones significantly expand the range of redox transitions in their complexes and the number of different electronic states associated with combinations of oxidized (reduced) forms of redox-active ligands and the central metal atom.…”

Ni(ii) complexes of a new tetradentate NN′N′′O picolinoyl-1,2-phenylenediamide-phenolate redox-active ligand at different redox levels

“…Transition-metal complexes of redox-active 1–6 (non-innocent) 2 a,b ,3,4 a ligands have recently received increasing attention due to their intriguing electronic properties, 7 triggered by solely organic radical-based redox-processes and also synergistic metal- and organic radical-based redox-processes, and distinct reactivity patterns, 2 f ,5,6 including enzymatic multi-electron redox reactions. 8 The prospective role of various ligand-based redox levels and their influence on metal centres in catalysis have been widely studied.…”