Oxygen—arsenic bonds

Both cw- and /ra -[Co(en)a(NH3)(P04H3)] + aquate by cobalt-oxygen bond fission, but [Co(NHs)5(As04)] has been shown by tracer experiments to aquate by arsenic-oxygen bond fission. [Co(NH3)b(N02)]+, and... 

Douhova et al. (2003) found that after mixing for 24-72 hours at 20 °C, calcinated synthetic hydrotalcite and calcinated natural boehmite were much more effective in removing As(V) from water than oxihumolite (i.e. humic-rich low-rank coals) (Douhova et al., 2003, 259). Dosages of 1 gL-1 of hydrotalcite or 2.6 gL-1 of boehmite removed 70.5 and 97.1 %, respectively, of 2 mmol L-1 (150 mg As L-1) of As(V) (Dou.vova et al., 2003, 265). The arsenic probably bonded with oxygens on the hydrotalcite and boehmite. Infrared spectra detected As-0 bonds in both inorganic sorbents (Dousova etal., 2003, 261, 263). In contrast, As-0 bonds were absent in the infrared spectra of the oxihumolite (Dou. ovd et al., 2003, 263). 

Evidence for exchange of arsenic-carbon with arsenic-oxygen and arsenic-sulfur bonds, respectively, is obtained from the thermal dispor-portionation of methylarsenous oxide (143) according to Eq. (154), of phenyl-arsenous oxide according to Eq. (155), and of alkyl or arylarsenous sulfides according to Eq. (156). 

Oxidative addition of compounds having arsenic(Ill)-oxygen bonds by o-benzoquinones gives cyclic As(V)—O bonded compounds as shown in equations 347 and 348 . ... 

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