Tetrazoles complexes

The azido complex [(T) -Cp )(N3)Rh( j.-N3),Rh(N3)(Ti -Cp )] with trifluoroace-tonitrile gives the tetrazole complex with two terminal and one bridging tetrazolate ligands as well as one unreacted bridging azido group, 193... 

Kusz J, Giitlich P, Spiering H (2004) Structural Investigations of Tetrazole Complexes of Iron(II). 234 129-153... 

The 1,3-dipolar cycloadditions of N3 with coordinated nitriles (211) may result in formation of 5-substituted tetrazole complexes (212). Some examples include [Co(NH3)5(N4R)]2+-(R =p-methylphenyl, /uchlorophenyl, /unitrophenyl (N1 bound), m-formylphenyl N2 bound)). 

Spin cross-over iron(II)-triazole and -tetrazole complexes have been reviewed. 

Tetrazole complexes of Ru have received far less attention than tiiazole or, in general, other heterocyclic ligands. Complex formation of Ru(bpy)2 and Ru(4,4 -Me2bpy)2 groups with the tetrazole ligands (82)-(84) has been studied, and electronic spectroscopic and electrochemical properties reported. ... 

Reactions between 5-cyanotetrazole and transition metals, when performed in boiling acetone, lead to hydrolysis of the cyano group and formation of 5-carbamyl tetrazolate complexes (68). Complexes containing 1- or 5-substituted tetrazolate anions can also be obtained by 1,3-dipolar cycloaddition of organic isonitriles (RNC) (15) or nitriles (RCN) (61), respectively, to coordinated azide ligands [Eqs. (3) and (4)]. 

Far infrared data have been reported and v(M-N) frequencies assigned for a variety of cobalt, nickel, copper, zinc, cadmium, and mercury tetrazolate complexes (153). An inverse relationship between the basicity of the tetrazolate anions and the values of v(M-N) has been interpreted as evidence of significant M - L n bonding (153). 

---