Abstract
Detailed spectroscopic data have been obtained for arsonoacetic acid, As(CH2COOH)O3H2, and its barium and sodium salts. The X-ray crystal structure of the free acid is isomorphous with phosphonoacetic acid. Reduction gave the As(I) compound arsenoacetic acid, (AsCH2COOH)n which was shown by ESI-MS to contain cyclic species based on As–As bonds, with n mainly 3–6. The X-ray crystal structure of the hexamer was determined as the pyridine solvate and shown to have a hexacyclic As6 ring in a puckered chair conformation, with –CH2COOH groups in equatorial sites, each H-bonded to a pyridine molecule in the lattice.
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