7-(2'-Deoxy-?-D-ribofuranosyl)hypoxanthine

The [alpha]-configured N7 analogue of 2'-deoxyinosine [7-(2'-deoxy-[alpha]-D-ribofuranosyl)hypoxanthine, C10H12N4O4] shows the following structural characteristics: (i) the furanose part of the molecule adopts the 2'-endo conformation [pseudorotation phase angle 166.4 (2)°]; (ii) the torsion angle [chi] (O4'-C1'-N7-C5) is syn [70.9 (1)°] with the base substituent pointing away from the sugar unit; (iii) the nucleobases are not hydrogen bonded to each other; only sugar-base hydrogen bonds between adjacent molecules were detected

Orientational order in the stable buckminster fullerene solvate C60.2CBr2H2

Crystals of the solvate C 60 ·2CBr 2 H 2 (monoclinic C2/m), which is stable in air, were grown by slow evaporation of solutions of C 60 in CBr 2 H 2 at room temperature. The high enthalpy change for the complete desolvation process, 54.9 kJ mol-1 of solvent, as well as the relatively large negative excess volume of-49.6 Å 3 indicate the presence of strong intermolecular interactions between C 60 and CBr 2 H 2. The strong intermolecular interactions are consistent with an overall orientational order for the C 60 and the CBr 2 H 2 molecules in the solvate as found by the Rietveld refinement of its crystal structure