George M. Brown

SUCROSE: PRECISE DETERMINATION OF CRYSTAL AND MOLECULAR STRUCTURE BY NEUTRON DIFFRACTION

This analysis provides the first precise molecular parameters for sucrose. All hydrogen atoms are included. Carbon-carbon distances are 1.51 1.53 �; carbon-oxygen 1.40 to 1.44 �; carbon-hydrogen 1.08 to 1.11 �; oxygen-hydrogen 0.94 to 0.99 �. The furanose ring conformation differs from that in sucrose sodium bromide dihydrate. Hydrogen bonds (two of them intramolecular) utilize every hydroxyl group except one.

Molecular Structure of an Unusual Organoactinide Hydride Complex Determined Solely by Neutron Diffraction

The structure of an unusual organometallic complex, {Th[(CH3)5C5]2 H(�-H)}2 � C6H5CH3, has been determined from neutron diffraction data, using only the direct-methods program MULTAN. Besides providing accurate metrical information on the first organometallic actinide hydride complex, these results have general and far-reaching implications concerning the complexity and size of crystal structures that can be elucidated solely on the basis of neutron diffraction data.