Coordination assemblies based on a flexible tetrathiafulvalene derivative

A tetrathiafulvalene (TTF) derivative bearing four peripheral 4-picolylthio units has been synthesized and employed for the formation of coordination assemblies with a series of divalent metal salts, highlighting the flexibility and adaptability of this ligand owing to the rotation allowed around the sulfur and carbon atoms of the thiomethyl spacer. While a [2 + 1] metallamacrocycle has been obtained with the tetrahedral Zn(NCS)(2) node, a series of 1D coordination networks has been characterized by X-ray diffraction with the octahedral Cd(NCS)(2), CdBr2, MnCl2 and CoCl2 nodes. Within this series, the observed conformation of the TTF is the same with the 4-picolylthio groups either above or below the mean plane of the sulfur-rich core leading to analogous 1D arrangements. However, their packing differs depending on the nature of the anions. Indeed, 1D stacks of the TTF cores form with halide salts, whereas dimers are observed in the case of the thiocyanate system. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A TTF derivative with four peripheral 4-picolylthio units was synthesized and used to form coordination assemblies with divalent metal salts, showing its flexibility and adaptability. Different 1D arrangements of TTF cores were observed depending on the nature of the anions, with halide salts forming stacks and thiocyanate system forming dimers.