Synthesis and characterization of the bimetallic polymers [MS4Ag2(Hmimt)2]n (where M=Mo or W, Hmimt=1-methylimidazoline-2(3H)-thione): crystal structures of [WS4Ag2(Hmimt)2]n and [Ag2I2(Hmimt)]n

Dichlorobis[1-methylimidazoline-2(3H)-thione]cadmium(II)

“…Due to their relevance in biological systems, the use of heterocyclic thiones as ligands in transition metal complexes has attracted much attention in the recent past (Raper, 1994(Raper, , 1997, because of the search for simple model compounds for metalloproteins. In view of this, Cu I , Ag I , Au I , Hg II and Cd II complexes with thiones have been widely studied (Isab et al, 2002, and references therein;Beheshti et al, 2005).…”

Three- and four-coordinate Ag(I) complexes of crotonate and bis(benzimidazole)-2-oxapropane ligands: syntheses, crystal structures, DNA-binding studies and antioxidant activities

“…The compounds of Ag(I) with multidentate N-donor ligands have attracted interest for a number of reasons. The absence of crystal field stabilization for the d 10 monovalent silver cation, coupled with its ability to tolerate a wide range of coordination geometries (with coordination numbers spanning 2-7), leads to considerable variation in the geometry and connectivity of the networks that can be formed when Ag(I) centers act as connectors [14,15]. Their various biological applications have also attracted attention [16].…”

Synthesis and structural characterization of mixed-metal complexes of CuI with MOS3 cores (M = Mo, W) and of an unusual polymeric AgI/mercaptoimidazole complex with five different AgI coordination environments

“…15 Our own interest in mixedmetal complexes of copper(I) and silver(I) with oxothiometalate a anions and heterocyclic thiones stems from our current research on coordination compounds of coinage metals with these ligands. [16][17][18][19] They show a fascinating variety of structures, both at the local chromophore and in the overall geometry; surprising results are sometimes obtained for the silver complexes, differing from their copper analogues, arising from the very soft character of silver(I) as a Lewis acid centre, which favours coordination by soft bases including sulfur-donating organic ligands and leads to coordination numbers ranging from two to six, and it is important to look for both comparisons and contrasts between related reactions and complexes of the two metals. 17, 18 We now report two additions to the family of mixed-metal complexes containing Cu I with the [MOS 3 ] 2core, and a polymeric mercaptoimidazole/AgI complex that was obtained unexpectedly during attempts to re-crystallize a related new WS 4 Ag 2 cluster complex with the softer [WS 4 ] 2core.…”

“…[16][17][18][19] They show a fascinating variety of structures, both at the local chromophore and in the overall geometry; surprising results are sometimes obtained for the silver complexes, differing from their copper analogues, arising from the very soft character of silver(I) as a Lewis acid centre, which favours coordination by soft bases including sulfur-donating organic ligands and leads to coordination numbers ranging from two to six, and it is important to look for both comparisons and contrasts between related reactions and complexes of the two metals. 17, 18 We now report two additions to the family of mixed-metal complexes containing Cu I with the [MOS 3 ] 2core, and a polymeric mercaptoimidazole/AgI complex that was obtained unexpectedly during attempts to re-crystallize a related new WS 4 Ag 2 cluster complex with the softer [WS 4 ] 2core. This polymeric complex displays a number of unusual structural features, while the two clusters, although chemically homologous, are crystallographically nonisostructural and exhibit subtle differences in their molecular structures.…”