The structures of both known forms of the polymorphic material ortho-acetamidobenzamide, C(9)H(10)N(2)O(2), have been determined by low-temperature neutron single-crystal diffraction. Neutron diffraction allows the full description of the H-atom positions in this molecular material, which is vital in benchmarking related crystal-structure predictions. Significant conformational differences are ...

The crystal structure of the high temperature phase of anilinium bromide, CeH5NH3®Br , was studied by X-ray and neutron diffraction at T = 343 K . The refinement supports disordered positions of the —NH3® group. A split-atom model is proposed which includes disorder of the benzene ring. The thermal parameters, hydrogen bond distances, and other experimental data (NMR, N Q R , inelastic neutron ...

Neutron diffraction is the method of choice when locating chemically interesting hydrogen atoms, particularly in systems containing a heavy metal. In this article, two fascinating complexes containing hydrogen atoms that were unambiguously located with neutron diffraction will be highlighted. The first complex, OsH3Cl(PPh3)3, is a Kubas-type complex containing a rare elongated dihydrogen ligand...

High oxygen conductivities can be achieved in cation ordered LnxZrl_=O2_l x (Ln=Gd, Nd) solid solutions with pyrochlore (P) structure. High values of the pre-exponentlal factor °o are correlated with the degree of anion disorder in the 8b oxygen sublattice (neutron diffraction). The activation energy AH is lowered by cation ordering (F-P transition; effect of x) due to the occurence of a prefer...

more than 30 mineral elements have been found with different key functions in helping plants and animals to survive and live healthy. as a direct result, they have always attracted the attention of scientists. the quest is to find some efficient analytical and quantitative procedures in this study to determine some mineral and trace elements of iranian crocus sativus l. corms. several studies h...

Seven-membered lactones undergo selective SmI2 -H2 O-promoted radical cyclization to form substituted cyclooctanols. The products arise from an exo-mode of cyclization rather than the usual endo-attack employed in the few radical syntheses of cyclooctanes. The process is terminated by the quenching of a chiral benzylic samarium. A labeling experiment and neutron diffraction study have been used...