Synthesis and Characterization of Three Coordinate “T-Shaped” Complexes of Tellurium (II) Incorporating a Naphthyl Tellurium Fragment

Abstract

Several new three coordinate tellurium(II) complexes have been prepared by the addition of dinaphthyl ditelluride (C₁₀H₇)₂Te₂ and a halogen (Br₂ or I₂) to various monodentate ligands known to coordinate through their terminal sulfur or selenium atoms to investigate possible electronic and steric effects associated with a large aryl group. Complexes of the type RTeX(L) are described here [R = naphthyl, X = Br, I, L = thiourea (I (X = Br), II (X = I)), tetramethylthiourea (III), selenourea (IV), tris(dimethylamino)phosphane selenide (V) and N-methylbenzothiazol-2(3H)-thione (VI)]. Evidence of the formation of new complexes is presented through microanalytical data and multinuclear NMR spectroscopy in addition to single crystal X-ray diffraction studies of (I) and (III). Structures are described in detail along with a comparison with related Te (II) complexes.

Keywords:

• Naphthyl tellurium
• T-shaped
• tellurium (II)
• thiourea
• X-ray structure

Acknowledgments

Would like to thank the Professional Development Committee and Jim Perry of UW–Fox Valley for generous financial support of this undergraduate research. We would like to express our gratitude to Jerry Lokensgard at Lawrence University (Appleton, WI) for the use of the NMR spectrometer.

Notes

*Two independent molecules in the unit cell.