seems rather difficult when M is the tungsten.The MoS2 final product has been characterized by both HREM and LRS. A correlation exists to indicate that the Raman lines characteristic of MoS2 are sensitive to their crystal size. Dehydration of a sample before sulfidation noticeably affects the size of the supported MoS2 slabs.

No abstract

A three-dimensional X-ray crystal structure analysis of SbCI3,CsH5NH2 is described. The unit cell is monoclinic, a = 10.86, b = 8.90, c = 10-10 8, p = 99.0', space group P2,,c, and contains 4 formula units. Least-squares refinement led to R = 0-136 for 637 independent reflections. The dimensions of the antimony trichloride molecule differ considerably form those of antimony trichloride in the pure crystalline state. The antimony atom is situated in a distorted trigonal bipyramidal environment with a nitrogen atom at one apex and with one of the equatorial positions occupied by a non-bonding lone pair of electrons. The Sb-N distance is 2-53 A, corresponding to a long bond.

By X-ray diffraction methods the compound (C5H,N)Me,SnCl is shownThe trigonal bipyramidal molecules contain to be monomeric and covalent. a five co-ordinate tin atom, the Sn-C1 distance being 2.42 f 0.04 A. Preparation of the Crystals.-Although Beattie and McQuillan X-RuyDutu.-C,H,,NSnCl, M = 278.2, orthorhon3bic.38 hkO, 62 hkZ, and 68 h0Z reflections were observed to be non-zero.

Soil entrapment by plant tissue is often ignored when the tissue is analyzed. This leads to errors in interpretation of results. Plant tissue samples were taken from vegetables grown in experimental field plots in Norfolk, VA, Riverhead, NY, and Geneva, NY. At harvest, plant tissues were washed with deionized water, cut into small pieces, oven dried (VA) or freeze dried (NY), ground to pass a 0.0841-cm stainless steel screen and stored in glass botries. The suqace 15 cm of each soil was sampled, Subportions of tissue and soil were analyzed for a number of elements by inductively coupled argon plamsa emission spectrometry (ICP-ES) and electrothermal atomic absorption ( E T A ) . Titanium (Ti) concentrations in the soil and plant tissue were used as a measure of soil inclusion. As much as 76% of the Al, 100% of the Cr, and 70% of the Fe in the vegetable samples could be accounted for by soil particulate inclusion by the plant tissue during its growth.