Affiliation:
1. Laboratório de Materiais Inorgânicos Departamento de Química Universidade Federal de Santa Maria 97105-900 Santa Maria, RS Brazil
2. Department Department of Inorganic Chemistry VNU University of Science 19 Le Thanh Tong 110403 Hanoi Vietnam
3. Ruprecht-Karls Universität Heidelberg Im Neuenheimer Feld 271 D-69120 Heidelberg Germany
4. Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 D-14195 Berlin Germany
Abstract
AbstractReactions of 2,6‐dipicolinoylbis(N,N‐diethylthiourea) (H2LEt) with common tellurium(IV) starting materials such as PhTeBr3 or TeBr4 yield various tellurium(IV) and tellurium(II) compounds depending on the conditions applied. Equimolar amounts of H2LEt and PhTeBr3 give the 1 : 1 complex [PhTeIVBr3(H2LEt)], while with an excess of H2LEt, the tellurium compound is partially reduced and a {PhTeII}+ building block coordinates to both sulfur atoms of H2LEt under the formation of the ion pair [PhTeII(H2LEt)][PhTeIVBr4]. Similar reactions between H2LEt and TeBr4 give the neutral monomer [TeIIBr2(H2LEt)] or the coordination polymer [TeIIBr2(H2LEt)]∞. The latter compound is also formed with the assistance of Pb2+ ions. While the lead ions do not appear in the isolated product, similar reactions with transition metal ions such as Ni2+, Mn2+, or Co2+ result in the formation of heterobimetallic complexes, in which Te(II) building blocks are directed to the sulfur atoms of the deprotonated ligand {H2LEt2‐S,S}2−, while the transition metal ions occupy central coordination positions between two of the organic ligands using the pyridine nitrogen atom, carbonyl oxygen atom(s) and/or the nitrogen atoms of the thiourea units.