Azides, crystal structures

Crystal structures of manganese catalases (in the (111)2 oxidation state) from Lactobacillus plantarum,its azide-inhibited complex, " and from Thermus thermophilus have been determined. There are differences between the structures that may reflect distinct biological functions for the two enzymes, the L. plantarum enzyme functions only as a catalase, while the T. thermo-philus enzyme may function as a catalase/peroxidase. The active sites are conserved in the two enzymes and are shown schematically in Figure 32. Each subunit contains an Mu2 active site,... 

Alkylations, osmium(ll), 37 348 Alkyl azides, UV spectra, 26 178 Alkylbarium halides, solvated, 11 390 Alkylbery Ilium alkoxides, 11 395 alkylperoxides, 11 395 amides, 11 401 03 anions, 11 369-370 crystal structure of, 11 369 halides, solvated, 11 389 hydrides, 11 371-373 B-Alkylborolane, 16 241... 

Figure 22. X-ray crystal structure ofthe di-copper complex of 62 with azide anion. ...

Jin S, Kurtz DM, Liu ZJ, Rose J, Wang BC (2002) X-ray crystal structures of reduced rubr-erythrin and its azide adduct a structure-based mechanism for a non-heme diiron peroxidase. J Am Chem Soc 124 9845-9855... 

The crystal structure of the lead azide is checked by examination under a microscope at frequent intervals from the beginning of the precipitation. The lead azide is precipitated as spherical crystals (Fig. 51). 

Thallous azide is a yellow, crystalline substance, m.p. 334°C. The crystal structure as determined by X-ray analysis points to the isomorphism of T1N3 with KN3 and RbN3 azides. 

Crystal structures for the azides have been reported for Mo.246"249... 

The azide in HgMe(N3)328 is terminally bonded. The structure of Hg(N3)2329 consists of N3—Hg—N3 units, but in the crystal structure each Hg atom interacts with another five N atoms of different N3—Hg—N3 units. 

Fig. 4. Crystal structures of the anion cryptates formed by the hexaprotonated receptor molecule 33-6H+ with fluoride (left), chloride (centre), and azide (right) anions.

When aqueous solutions of the complexes [Co(NH3)5(N=CR)]3+ (R=Me or Ph) are treated with an excess of NaN3 at pH 5-6 (to prevent base hydrolysis to the amido complex) tetrazole complexes are formed (Scheme 17).32 The formation of 5-methyltetrazoIe from sodium azide and acetonitrile requires a reaction time of 25 h at 150 °C323 compared with only 2 h at ambient temperature for coordinated acetonitrile. The subsequent conversion of the N -bonded complex to an N2-bonded complex has been confirmed as the latter complex has been prepared and its crystal structure determined.324... 

P2j Z = 4 Dx = 1.31 R = 0.06 for 3,059 intensities. The crystal structure contains two symmetry-independent molecules. Both pyranose conformations are C u with all substituents equatorial. The conformations are very similar, with corresponding, ring torsion-angles differing by less than 4.5°. The azide orientation is -sc, with 0-5-C-l-N-N torsion-angles of -51 and —68° in the two molecules. The C-l-N bond-lengths are normal, 144.5 pm. 

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