The structure of a synthetic ferritin-like polymer of approximate composition Fe103(0H)4-(NO&. 1 SH20 has been investigated using X-ray scattering from aqueous solution, infrared and Mossbauer spectroscopy, and magnetic susceptibility measurements. The ferric ions are all tetrahedrally coordinated by 02-, OH-, and H 2 0 in a corner-sharing

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En~-to-~nd distances. for a s~ries of alkanes in the range Cs-to C22-have been measured by the technique descrIbed m the precedmg artIcle. There appears to be good agreement with the theoretical values of the characteristic ratio (r2)/nI2 cited by Flory. However, there is evidence that solvent effects are present. These are discussed.