SOME TETRAZOLE COMPLEXES OF TRANSITION METAL HALIDES

Anhydrous complexes of pentamethylenetetrazole (PMT) were prepared with first-row transition metal chlorides and bromides. Two types of complexes were isolated, MII(PMT)X2 and MII(PMT)2X2. Both types of compounds are quite insoluble in polar and nonpolar liquids and have high melting or decomposition points. Magnetic and spectral evidence indicate that the metal ions in the MII(PMT)X2 complexes are in octahedral environments while MII(PMT)2X2 complexes may be tetrahedral. The former compounds are probably polymeric and contain halogen bridges, while complexes containing two molecules of the ligand are probably monomeric and have tetrahedral structure. © 1968, American Chemical Society. All rights reserved.