A new preorganized tridentate ligand bearing three indolethiolate groups. Preparation of 3∶1 subsite-differentiated Fe4S4 clusters

Publisher Website
Google Scholar
Abstract
1,3,5-Triethyl-2,4,6-tris(3-sulfanylindolyl[1]methyl)benzene (TriSH 3 ) has been prepared in three steps from 3-sulfanylindole and 1,3,5-tris(bromomethyl)-2,4,6-triethylbenzene. X-Ray analysis and NMR spectroscopy demonstrated it is highly preorganized for co-ordination to three subsites of a Fe 4 S 4 cluster core. The clusters [PPh 4 ] 2 [Fe 4 S 4 (TriS)(Br)] and [PPh 4 ] 2 [Fe 4 S 4 (TriS)(SPh)] were obtained by reaction of [PPh 4 ] 2 [Fe 4 S 4 (SEt) 4 ] with TriSH 3 under dynamic vacuum followed by addition of [(Me 2 N) 2 CSSC(NMe 2 ) 2 ]Br 2 and substitution of bromide with PhS - respectively. The latter was characterized by X-ray structure analysis. No crystallographic symmetry is imposed on the cluster anion and the cluster core exhibits the tetragonal distortion typical of tetrathiolate-substituted Fe 4 S 4 cores. This implies that the trithiolate ligand TriS 3- is sufficiently rigid to guarantee co-ordination to a single cluster core, while it is still flexible enough to match the preferred core distortions.

This publication has 0 references indexed in Scilit: