Braunschweig, Holger published the artcileSynthesis, Crystal Structure, EPR and DFT Studies, and Redox Properties of [2]Tetramethyldisilacobaltocenophane, Synthetic Route of 18346-57-1, the publication is Organometallics (2008), 27(24), 6427-6433, database is CAplus.
The 1st [2]silacobaltocenophane, [(Me2Si)2(η5-C5H4)2Co] (1), was synthesized by dilithiation of 1,2-bis(cyclopentadienyl)-1,1,2,2-tetramethyldisilane with BuLi and subsequent reaction with [CoBr2(dme)]. EPR spectroscopic studies of frozen pentane solutions of 1 at X-band showed a fully anisotropic g tensor (g1 = 1.914, g2 = 2.005, and g3 = 2.084) with hyperfine couplings on all three components (A1 = 145 MHz, A2 = 67 MHz, and A3 = 424 MHz). DFT studies using the B3LYP functional with its 20% exact exchange provide the best agreement with experiment and reproduce the g and A tensors well. Spin-orbit contributions to the isotropic coupling (APC) and to the anisotropies (Aidip,2) are significant. As was shown by cyclic voltammetry in THF, 1 is quasi-reversibly oxidized to the neutral cobaltocenium cation [(Me2Si)2(η5-C5H4)2Co]+ (8) at a potential of E°1/2 = -1.27 V (vs. the Fc/Fc+ couple) and quasi-reversibly reduced to the corresponding anion [(Me2Si)2(η5-C5H4)2Co]– (9) at E°1/2 = -2.40 V. The preparative oxidation of 1 with 1 equiv of ferrocenium hexafluorophosphate ([Fc][PF6]) provided the diamagnetic [PF6]– salt of the cation 8 in high yields. The mol. structures of both complexes (1 and 8) were confirmed by x-ray diffraction anal., and a significant decrease in mol. strain was depicted. DFT findings support the experiments
Organometallics published new progress about 18346-57-1. 18346-57-1 belongs to bromides-buliding-blocks, auxiliary class Cobalt, name is Cobalt(II) dibromo(1,2-dimethoxyethane), and the molecular formula is C4H10Br2CoO2, Synthetic Route of 18346-57-1.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary