A single-crystal of ammonia, NH3, was grown in a
thin-walled capillary at 178 K, and high-resolution X-ray
diffraction data were obtained for this compound at 160 K in order to
obtain information about electron
density distribution. Conventional and multipole refinements and
deformation electron density maps indicated
small but significant N−H bond bending inside the NH3
tetrahedron that is in agreement with ab initio
quantum-chemical calculations and the VSEPR model. Topological analysis of
the experimental charge density
distribution in the ammonia molecule has been performed, and the data
are compared with high-level quantum-chemical calculations. Some features of the intermolecular hydrogen
bonds in the crystal are discussed.
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251ChemInform Abstract The reaction of (I) with sulfur or selenium (II) affords the novel complexes (III). Heating of (IIIa) in benzene gives the thiadiphosphiranyl complex (IVa), while the unstable (IIIb) slowly rearranges to (IVb) in solution at ambient temperature. The X-ray structure of (IIIa) is reported (space group P1, Z=2).
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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