Author(s)

Christophe Faulmann^1,2*, Benoît Cormary^1,2, Dominique de Caro^1,2*, Kane Jacob^1,2, Lydie Valade^1,2, Pascale de Caro³

¹CNRS, LCC (Laboratoire de Chimie de Coordination), Toulouse, France.
²Université de Toulouse, UPS, INPT, Toulouse, France.
³Laboratoire de Chimie Agro-Industrielle (LCA), Université de Toulouse, INRA, INPT, Toulouse, France.

Nanoparticles of the conductive coordination polymer Ni(tto) have been synthesized under mild conditions in the presence of bio-based polyesters or polyethylene glycol acting as growth controlling agents. With polyesters, aggregates of particles are observed whereas well dispersed nanoparticles are obtained with polyethylene glycol. Indeed, for a Ni²⁺/polyethylene glycol weight ratio of 0.031, transmission electron micrographs evidence dispersed particles exhibiting sizes in the 3 - 10 nm range. Infrared spectra for nanopowders show two CS stretching modes in the 1100 - 1190 cm⁻¹ range, confirming the presence of the tetrathiooxalate ligand coordinated to the nickel center. The room-temperature electrical conductivity for the nanopowder prepared in the presence of polyethylene glycol is about 0.8 S∙cm⁻¹, a decent value for tetrathiolate-based polymers. Finally, magnetic susceptibility measurements for well-dispersed Ni(tto) particles evidence a Curie-Weiss law in a large temperature range. Moreover, low temperatures measurement would confirm intra- or interchain interactions between nickel atoms within the Ni(tto) polymer chains.

Conductive Coordination Polymers, Tetrathiooxalate, Polyethylene Glycol, Biobased Polyesters, Nanoparticles

Faulmann, C. , Cormary, B. , de Caro, D. , Jacob, K. , Valade, L. and de Caro, P. (2020) Synthesis and Characterization of the Thermoelectric Nickel Tetrathiooxalate Polymer as Nanoparticles. Journal of Materials Science and Chemical Engineering, 8, 1-12. doi: 10.4236/msce.2020.84001.