Tetrazoles metal complexes

Tetraphosphine ligands, 995 Tetrapyridyls metal complexes, 91 geometry, 91 Tetrapyrroles metal complexes, 79 T etraselenoether metal complexes, 666 Tetrasulfur tetranitride metal complexes, 799 Tetrathiolane, bis(imino)-metal complexes, 591 Tetrathiooxalic acid metal complexes, 585, 606 Tetrathiosquaric acid metal complexes, 606 Tetrazole, 2-methyl-metal complexes, 77 Tetrazole, pentamethyl-metal complexes, 77 Tetrazoles metal complexes, 76 pK,ll... 

A number of studies have been reported concerning azide-isocyanide condensations to give tetrazoles. Early work by Beck and co-workers 18, 19) describes the addition of various isocyanides to metal azido species [Au(N3)4]", [Au(N3)2]", Au(PPh3)N3, and M(PPh3)2(N3)2, M = Pd, Pt, Hg. The products are carbon-bonded tetrazolato-metal complexes. It is not known whether metal isocyanide complexes are intermediates in these reactions. More recently inverse reactions with azide ion addition to metal isocyanide complexes were carried out, with similar results. From... 

See entry nitramine- metal complexes See other a-nitro compounds, tetrazoles... 

Table 1 Metals complexed with substituted tetrazoles.

See entry NITRAMINE METAL COMPLEXES See other A-NITRO COMPOUNDS, TETRAZOLES... 

Table 25 Structural data on selected metal complexes of tetrazole derivatives... 

The reaction of 5-ATZ with silver salts may, in certain conditions, lead to complex rather than normal salts. The only metallic complex salt of 5-amino-l//-tetrazole that has been reported as suitable as a primary explosive is the complex disilver 5-amino-1/J-tetrazoIium perchlorate Ag2(ATZ)C104. It was first reported by Charles Rittenhouse in 1972 [38]. The analogous nitrate complex has been published recently [39]. Both complexes are insoluble in water and other common solvents. They are only soluble in cmicentrated acid solutions (e.g., hydrochloric, nitric, perchloric acid) forming the corresponding salts [39]. 

Many of the newly developed pyrotechnics are based on metal complexes with very nitrogen-rich ligands, mainly tetrazole derivatives (Fig. 2.17). Unlike conventional... 

Formation of metastable [Cr(H20)5L]" ions is often achieved by inner-sphere redox reactions, usually by the reaction of [Cr(H20)6] with inert-metal complexes such as [Co(NH3)5L]". Recent examples include cases where L = tetrazoles, "0S02NH2, 3- or 4-CNC6H4CO2 and [0CC(CH3)C(CN)C(CH3,C0]. < ... 

Despite the weak basicity of isoxazoles, complexes of the parent methyl and phenyl derivatives with numerous metal ions such as copper, zinc, cobalt, etc. have been described (79AHC(25) 147). Many transition metal cations form complexes with Imidazoles the coordination number is four to six (70AHC(12)103). The chemistry of pyrazole complexes has been especially well studied and coordination compounds are known with thlazoles and 1,2,4-triazoles. Tetrazole anions also form good ligands for heavy metals (77AHC(21)323). 

---