| Abstract
| - The study of the sugar−metal ion interactions remains one of the main objectives of carbohydrate coordinationchemistry because the interactions between metal ions and carbohydrates are involved in many biochemicalprocesses. This paper presents a comparison of coordination structures of erythritol with alkaline-earth-metal andlanthanide chloride and nitrate in the solid state using FT-IR and X-ray diffraction. Neutral, nondeprotonated erythritol(E) reacts with CaCl2 to give three CaCl2-erythritol (CaE(I), CaE(II), CaE(III)) complexes, showing that three of thefive general features of calcium−carbohydrate complexes deduced in the reference encounter contrary examples.Different coordination structures have been observed for calcium and lanthanide chloride and nitrates. The coordinationof carbohydrates to metal ions is complicated, and erythritol, chloride ions, nitrates, water molecules, and ethanol(crystallization medium and reaction solvents) have the chance to coordinate to metal ions. IR spectral resultsshow that different lanthanide ions, from LaCl3 to TbCl3, have similar coordination structures with erythritol. Theresults show that erythritol can act as two bidentate neutral ligands (CaE(I), CaE(II), CaE(III), CaEN, PrE, NdE) oras a three-hydroxyl donor (NdEN). The IR results are consistent with the crystal structures.
- A comparison of coordination structures of erythritol with alkaline-earth-metal and lanthanide chloride and nitrate in the solid state using FT-IR and X-ray diffraction is given. Erythritol reacts with CaCl2 to give three CaCl2-erythritol complexes, and different coordination structures have been observed for calcium and lanthanide chloride and nitrates. The results show that erythritol can act as two bidentate neutral ligands or as a three-hydroxyl donor. The IR results are consistent with the crystal structures.
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