Ashley, Andrew E. published the artcileHomoleptic Permethylpentalene Complexes: “Double Metallocenes” of the First-Row Transition Metals, Formula: C4H10Br2CoO2, the publication is Journal of the American Chemical Society (2008), 130(46), 15662-15677, database is CAplus and MEDLINE.
The synthesis of the bimetallic permethylpentalene complexes Pn*2M2 (M = V, Cr, Mn, Co, Ni; Pn* = C8Me6) was accomplished, and all of the complexes were structurally characterized in the solid state by single-crystal x-ray diffraction. Pn*2V2 (1) and Pn*2Mn2 (3) show very short intermetallic distances that are consistent with metal-metal bonding, while the Co centers in Pn*2Co2 (4) exhibit differential bonding to each side of the Pn* ligand that is consistent with an η5:η3 formulation. The Pn* ligands in Pn*2Ni2 (5) are best described as η3:η3-bonded to the metal centers. 1H NMR studies indicate that all of the Pn*2M2 species exhibit D2h mol. symmetry in the solution phase; the temperature variation of the chem. shifts for the resonances of Pn*2Cr2 (2) indicates that the mol. has an S = 0 ground state and a thermally populated S = 1 excited state and can be successfully modeled using a Boltzmann distribution (ΔH° = 14.9 kJ mol-1 and ΔS° = 26.5 J K-1 mol-1). The solid-state molar magnetic susceptibility of 3 obeys the Curie-Weiss law with μeff = 2.78 μB and θ = -1.0 K; the complex is best described as having an S = 1 electronic ground state over the temperature range 4-300 K. Paradoxically, attempts to isolate the double ferrocene equivalent, Pn*2Fe2, led only to the isolation of the permethylpentalene dimer Pn*2 (6). Solution electrochem. studies were performed on all of the organometallic compounds; 2-5 exhibit multiple quasi-reversible redox processes. D. functional theory calculations were performed on this series of complexes to rationalize the observed structural and spectroscopic data and provide estimates of the M-M bond order.
Journal of the American Chemical Society 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, Formula: C4H10Br2CoO2.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary