Tetrahedral μ₄-chloride and in situ generated octahedral μ₆-sulfide templating Co₈ complexes with different distortions of the cube

Abstract

Two unprecedented octanuclear Co8 clusters with distorted cubes were synthesized using chloride and in situ generated sulfide as templates, in which strong intra-cluster antiferromagnetic interactions were found.

Synthesis, structural determination, in vitro and in silico biological evaluation of divalent or trivalent cobalt complexes with indomethacin

“…A search of the literature regarding Cl-bridged cobalt complexes revealed the following: (i) one, two and three Cl-bridges between Co atoms have been reported, (ii) one Cl-bridge was reported in co-existence with other bridges based on O or N atoms [ [53] , [54] , [55] ], (iii) in the case of two [ [56] , [57] , [58] , [59] , [60] , [61] , [62] , [63] , [64] , [65] ] and three Cl-bridges [ [66] , [67] , [68] ], the compounds were di- [ [56] , [57] , [58] , [59] ], tri- [ 60 , 61 ] or poly-nuclear [ 62 , 63 ] and in few cases polymeric [ 64 , 65 ], (iv) in complexes having only Cl-bridges, the reported Co…Co separation distance was in the range 3.024–4.006 Å [ [66] , [67] , [68] ]. Considering all these data, we may suggest that the structure of complex 1 is among the rare cases containing the existence of a unique Cl-bridge between Co atoms and the reported Co…Co of 3.988 Å is within the range found for Cl-bridged cobalt atoms.…”

Constructing [CoII6] hexagon-centered heterometallic {Ln6Co6} (Ln = Y, Eu and Dy) clusters with a calix[8]arene ligand

“…Those behaviours are similar to other Co clusters with spin glass behaviours. 37,38 For CIAC-249, the spin glassy behavior probably is attributed to the weak magnetic moment from Eu(III) ions that modified the magnetic coupling between Co(II) ions. Every Eu 2 C8A SUB bridges two Co(II) ions (Co 2 dimer), and three Co 2 dimers result in a triangular structure.…”