First oxidative synthetic route of a novel, linear mixed valence Co(III)Co(II)Co(III) complex with bridging acetate and salen

1,1-Azido bridge driven aggregation of a centrosymmetric trinuclear linear CoIIICoIICoIII complex

“…The Co(II)-N(azido) distances (2.128(4) and 2.172(4) Å ) are longer than Co(III)-N(azido) distances (1.958(4) and 1.961(4) Å ). Co(III)-N(Q À ) and Co(III)-O(Q À ) distances are comparable to the corresponding distances in 1 and other 8-quinolinolate complexes of known structures [13,21]. The bond angles of Co III -N(azido)-Co II are in the range between 99.64(16)°and 101.26(16)°, and the metalmetal separation through EO azide is Co(III)-Co(II), 3.160 Å [13,16,28].…”

“…It functioned as a structural bridge for metal ions within one-, two-or three-dimensional extended coordination arrays, rather than discrete molecules, unveiling interesting phenomena such as ferrimagnetism within homometallic chains [3] or sheets [12]. Linear mixed valent Co III Co II Co III [13][14][15][16] and Co II Co II Co II [17] complexes are known with chelating and bridging ligands. In trying to isolate and study new forms of Co 3 aggregates, we have been exploring the reactions of cobalt(II) with the ligand 8-quinolinol (HQ) in non-aqueous medium.…”

Counter anion modulated variation of denticity of NNO donor Schiff base in copper(II) complexes: Isolation of a zwitterionic Schiff base as the metal complex

“…Simple one-step reaction of various primary diamines, such as 1,2-diaminoethane, 1,3-diaminopropane, o-phenylenediamine etc with salicylaldehyde or its derivatives in 1:2 ratio yields the well-known Salen-type tetradentate Schiff bases, which form very stable mono-and poly-nuclear complexes with many transition metals [1][2][3][4][5][6][7], with countless applications as materials [8,9], catalysts [10][11][12] etc. The 1:1 condensation of a diamine with salicyaldehyde (or its derivative) may also be obtained in a good yield to produce a 'half unit' by a template synthesis in the presence of metal ions [13].…”

Coordination Versatility of 5(3)‐(2‐Hydroxyphenyl)‐3(5)‐methylpyrazole: Synthesis, Crystal Structure and Properties of CoIII, NiII and CuII Complexes

“…The cobalt(III) to oxygen and cobalt(III) to nitrogen bond lengths are in the ranges of 1.865-2.002 Å and 1.875-1.969 Å, respectively, as expected for low-spin cobalt(III) complexes. [10] The largest deviation from the octahedral geometry is observed for the trans angle which is O81-Co2-O41 174.90(17)°. The Co-O-Co angle is 107.09°, and it is slightly smaller than the angle normally observed for phenoxido-bridged dinuclear cobalt(III) complexes.…”