Zero-field splitting in tetracoordinate Co(II) complexes

Synthesis and Characterization of 4‐, 5‐, and 6‐Coordinate Tris(1‐ethyl‐4‐isopropylimidazolyl‐κN)phosphine Cobalt(II) Complexes

“…If E = 0, then 2D represents the energy separation between Ϯ1/2 and Ϯ3/2 doublets arising from second-order contributions from the quartet ground state of the distorted square pyramid (for 1) and tetrahedral (for 2 and 3) Co , g = 2.14(1), Nα = 7ϫ 10 -5 cm 3 mol -1 ; and zJЈ = -0.04(4) cm -1 for 3. The D values for 2 and 3 agree well with those previously observed for tetrahedral complexes, [43,44] whereas the value for 1, even though somewhat high, is similar to that observed for pentacoordinate high-spin square-pyramid Co II complexes. [45,46] The change from Cl to Br on passing from 2 to 3 affects the ligand field around the Co II ion and, as a result, the values of D and g, [47] and this change can be, at least in part, responsible of the small differences between these parameters observed for 2 and 3.…”

Zero-Field Splitting in Pseudotetrahedral Co(II) Complexes: a Magnetic, High-Frequency and -Field EPR, and Computational Study

“…Structural and magnetic data relevant to a novel magnetostructural D correlation for pseudotetrahedral Co(II) complexes have begun to accumulate . However, the situation is more complex than in Ni(II), since in pseudotetrahedral complexes of the [CoL 4 ] and [CoL 2 X 2 ] type, the distortions from ideal tetrahedron are more variable, and D 2d , C 2v , C 2 , and C 1 symmetries often occur.…”

Crystal structure of di-μ-chlorido-bis[chloridobis(1,2-dimethyl-5-nitro-1H-imidazole-κN 3)copper(II)] acetonitrile disolvate

“…There is only one structurally characterized metal compound containing dimet listed in the Cambridge Database (CSD Version 5.37; Groom et al, 2016), namely, a mononuclear cobalt complex, [Co(dimet) 2 Cl 2 ], in which the cobalt(II) atom is surrounded by two dimet and two chlorido ligands in a distorted tetrahedron (Rosu et al, 1997;Idešicová et al, 2012). The Co-N distances are reported to be 2.228 (2) and 2.035 (4) Å (Rosu et al, 1997).…”