Preparations for 1,4,7,11,14,17-hexa-thiacycloeicosane, 1,4,7-trithiecan-9-ol, 1,11 -dioxa-4,8,14,18-tetrathia-cycloeicosane, 1 -oxa-4,8-dithiacyclo-decane, and some complexes of iron, cobalt, nickel, and palladium

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.…”

“…Likewise, the ligand 20S6 is also electrochemically silent in the same solvent over this range, but other workers have reported different behavior in acetonitrile [17]. The electrochemical data for the Ni(II) complexes with hexathioether macrocycles are summarized in Table 1.…”

“…However, only a limited number of complexation studies involving larger ring size hexathioethers have appeared. These include six reported crystal structures involving complexes of 20S6 [51][52][53][54][55] (principally by our group and the Lucas group), one crystal structure of a 24S6 complex [56], one Ag(I) complex of a hydroxylated hexathioether [57], and a few involving even larger macrocycles [58]. For several years, we have been interested in studying the effects that structural alterations on macrocyclic thioether ligands have on the ease of complex formation, complex stability, and complex structure.…”

Metal Complexes of 1-Oxa-4,7-dithiacyclononane

“…Thiocrown ethers as ligands have been studied intensively for over a decade, and from time to time during that period, reviews of progress in the field have appeared. − More recently, interest in differences in the properties of metal complexes caused by replacement of one or more thioether sulfurs with amine nitrogen atoms has been apparent in the literature. − In spite of this and the obvious connection between crown ethers and thiocrown ethers, less effort, until quite recently, − has been devoted to a comparison of O,S donor complexes with complexes of these other ligand systems. As part of our continuing interest in the properties of both acyclic and cyclic ligands that have thioether and other donors, − we have examined the properties of some metal complexes of ligand L and the results are reported herein for the purpose of comparison with those from homothioether and mixed S,N donor macrocyclic ligand complexes.…”

Copper(II) complexes of open-chain thioether ligands terminated by salicylaldimine functionality*This article has a companion paper in this issue (doi: 10.1139/v11-081).

“…It should be noted in this context that coordination by ethereal oxygen in a hydrocarbon chain also containing thioether sulfurs is well-known. [22][23][24] The structure of VII involves roughly octahedral NO 3 SBr coordination spheres about each of two copper atoms. The coordination spheres share common ethereal and phenolic oxygens and as a result the pseudo-octahedra are tipped towards each other by 74.57 (5)°so that the angle between their O 2 NS planes is 105.43(5)°.…”