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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaIO3 by Materials Project

NaIO3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Na1+ is bonded to six O2- atoms to form corner-sharing NaO6 octahedra. The corner-sharing octahedra tilt angles range from 54–66°. There are a spread of Na–O bond distances ranging from 2.43–2.49 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Na1+ and one I5+ atom. The O–I bond length is 1.84 Å. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Na1+ and one I5+ atom. The O–I bond length is 1.83 Å. I5+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaIO3 by Materials Project

NaIO3 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.26–3.00 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a square co-planar geometry to two equivalent Na1+ and two equivalent I5+ atoms. Both O–I bond lengths are 1.98 Å. In the second O2- site, O2- is bonded in a distorted linear geometry to two equivalent Na1+ atoms. In the third O2- site, O2- is bonded in a distorted linear geometry to two equivalent Na1+ atoms. I5+ is bonded in a linear geometry to two equivalent O2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaIO3 by Materials Project

NaIO3 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.42–2.94 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Na1+ and one I5+ atom. The O–I bond length is 1.84 Å. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Na1+ and one I5+ atom. The O–I bond length is 1.83 Å. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Na1+ and one I5+ atom. The O–I bond length is 1.83 Å. I5+ is bonded in a trigonal non-coplanar geometry to three O2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Oxidation of p-[125I]Iodobenzoic Acid and p-[211At]Astatobenzoic Acid Derivatives and Evaluation In Vivo

The alpha particle-emitting radionuclide astatine-211 (211At) is of interest for targeted radiotherapy; however, low in vivo stability of many 211At-labeled cancer-targeting molecules has limited its potential. As an alternative labeling method, we evaluated whether a specific type of astatinated aryl compound that has the At atom in a higher oxidation state might be stable to in vivo deastatination. In the research effort, para-iodobenzoic acid methyl ester and dPEG4-amino acid methyl ester derivatives were prepared as HPLC standards. The corresponding para-stannylbenzoic acid derivatives were also prepared and labeled with 125I and 211At. Oxidization of the [125I]iodo- and [211At]astato-benzamidyl-dPEG4-acid methyl ester derivatives provided materials for in vivo evaluation. A biodistribution was conducted in mice with coinjected oxidized 125I- and 211At-labeled compounds. The oxidized radioiodinated derivative was stable to in vivo deiodination, but unfortunately the oxidized [211At]astatinated benzamide derivative was found to be unstable under the conditions of isolation by radio-HPLC (post animal injection). Another biodistribution study in mice evaluated the tissue concentrations of coinjected [211At]NaAtO3 and [125I]NaIO3. Comparison of the tissue concentrations of the isolated material from the oxidized [211At]benzamide derivative with those of [211At]astatate indicated the species obtained after isolation was likely [211At]astatate.

59 BASIC BIOLOGICAL SCIENCES↗