Transition metal complexes with sulfur ligands Part LXXIX. Crown thioether complexes of iron, cobalt, nickel and copper with bzo2-18S6. X-ray structure analysis of [Ni(bzo2-18S6)][B(C6H5)4]2 (bzo2-18S6 = 2,3,11,12-dibenzo-1,4,7,10,13,16-hexathiacyclooctadeca-2,11-diene)

Metal binding studies with macrocyclic hexathioethers: Transition metal complexes of 22S6 and 20S6

“…(2) with Ni(II), Cd(II), Ru(II), and Cu(II) are also presented in this report. The magnetic moments for the Ni(II) complexes were in the range of 2.95-3.05 B.M., similar to previously reported values of hexakis(thioether) nickel(II) complexes and consistent with two unpaired electrons per nickel [9,51,61,62]. Magnetic susceptibility measurements on the 22S6 complexes of Fe(II) and Co(II) complexes show that both are low-spin complexes, and their absorption spectra (see below) are also consistent with low-spin systems.…”

Structural Characterization of the Zinc Site in Protein Farnesyltransferase

“…Two distinctive shoulders were seen in the LMCT region (320 to 370 nm) with an intensity (ε = 1600 M -1 cm -1 ) intermediate between that of resting FTase (one thiolate ligand, ε = 1030 M -1 cm -1 ) and that of the ternary complex (two thiolate ligands, ε = 1900 M -1 cm -1 ) . The intensity of the charge-transfer transition for the product complex would be consistent with mixed Co-thiolate + Co-thioether ligation, thus suggesting that the thioether product remains coordinated to the Co (and thus presumably to the Zn). However, other factors, including thiolate-Co geometry, can affect the observed charge-transfer intensity, thus potentially complicating interpretation of the UV−visible spectra.…”

“…) 1900 M -1 cm -1 ). 1 The intensity of the charge-transfer transition for the product complex would be consistent with mixed Co-thiolate + Co-thioether ligation, 44 thus suggesting that the thioether product remains coordinated to the Co (and thus presumably to the Zn). However, other factors, including thiolate-Co geometry, can affect the observed charge-transfer intensity, thus potentially complicating interpretation of the UV-visible spectra.…”

Transition Metal Complexes with Sulfur Ligands. 117.1A Reaction Cycle for Nickel Mediated Thioester Formation from Alkyl, CO, and Thiolate Groups Modeling the Acetyl-Coenzyme A Synthase Function of CO Dehydrogenase

“…The Ni-S(thiolate) and Ni-S(thioether) distances lie in the expected range of 217-220 pm, 2g,26,27 and their nearly identical values can be traced back to the σ-donor-π-donor and σ-donor-π-acceptor character of the respective bonds. 28 Less common is the molecular structure…”