Heterocyclic Selenium- and Tellurium-Nitrogen Compounds

Abstract

The methods available for the synthesis of selenium-nitrogen (Se-N) heterocycles are discussed. The chemistry of phosphorus-containing Se-N and Te-N ring systems is described and compared with that of the corresponding S-N heterocycles. The P₂N₄Se₂ ring is a versatile ligand in transition-metal complexes. The use of ⁷⁷Se NMR and ESR spectroscopy in the characterization of cyclic Se-N systems is also presented.

Key Words:

• synthesis
• selenium-nitrogen heterocycles
• tellurium-nitrogen heterocycles
• phosphorus-nitrogen-chalcogen rings
• coordination complexes
• ESR spectra
• ⁷⁷Se and ¹²⁵Te NMR spectra