Search
Now showing items 1-10 of 34
The preparation and x-ray structural characterization of dinuclear chromium, molybdenum, ruthenium, rhodium, and osmium complexes
(1983)
Eleven new dimeric complexes containing metal-metal bonds have been prepared and structurally characterized by X-ray crystallography. Seven are of the type M(,2)(O(,2)CR)(,4) (M = Cr, Mo, Rh; R = CH(,3), 2-biphenyl, CPh(,3), ...
The electron density in beryllium intermetallic compounds
(1983)
The electron deformation density of Li(,2)BeF(,4) was investigated with respect to a description of purely covalent bonding. X-ray diffraction data was collected from a single Li(,2)BeF(,4) crystal in the range 0.0 sin ...
Catalytic properties of alkali metal-graphite intercalation compounds
(1983)
Identities, as well as purities, of synthesized alkali metal-graphite intercalation compounds were confirmed by X-ray diffraction methods. Second-stage compounds (MC(,24), M = K, Rb, or Cs) adsorb large amounts of nitrogen ...
Stereoselective electrophilic reactions using azaallyllithium reagents generated from acyclic imidate esters
(1983)
The generation and synthetic utility of azaallyllithium reagents from acyclic imidate esters was described. The acyclic imidate esters 5-15, 18-22, 31-33, 34, 36 and 37 were prepared by various methods. Azaallyllithium ...
A new method for the simultaneous determination of pyrite content and proximate analysis in coal and lignite
(1983)
Coal Analysis is ordinarily divided into three parts: (1) Proximate analysis, determination of moisture, volatile matter, fixed carbon and ash contents; (2) Ultimate analysis, determination of carbon, hydrogen, sulfur, ...
Synthesis and evaluation of the biological activity of analogues of leupeptin
(1983)
Leupeptin, N-acetyl or N-propionyl-L-leucyl-L-leucyl-DL-argininal, is a potent inhibitor of trypsin-like enzymes; however, it is not selective within this proteolytic class. In an effort to increase selectivity among ...
The characterization of catalytically active sites on lanthanum sesquioxide for olefin isomerization and hydrogenation
(1983)
The active sites on La(,2)O(,3) that are responsible for 1-butene isomerization are "acid-base" pair sites which are generated by the thermal removal of surface hydroxyls over the pretreatment temperatue range 400(DEGREES)C ...
The synthesis and structural characterization of dinuclear and triniuclear vanadium complexes
(1983)
The reactions of VCl(,2)(.)2THF and VCl(,3)(.)3THF with ligands capable of functioning as three atom bridges between metal atoms were studied. Several new dimeric and trimeric vanadium complexes in oxidation states II to ...
Microabsorptiometry with heavy ions
(1983)
This study investigated the use of heavy ion (Z > 3) absorptiometry for the measurement of thickness/density variations in low density (1-2 g/cm('3)) materials on a microscopic scale ((LESSTHEQ) 10 (mu)m lateral resolution) ...
Synthesis and structural characterization of dinuclear and trinuclear chromium complexes and dinuclear tungsten complexes
(1983)
Dichromium(II) compounds are unique among metal-metal quadruply bonded systems in the range of metal-metal distances they display and in the tendency of the metal atoms in neutral molecules to bind axial ligands. X-ray ...