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ACS Essential PUBLICATIONS Resources for the Chemical Sciences EDITOR:
Leonard V. Interrante
Rensselaer Polytechnic Institute ASSOCIATE EDITORS
Dennis W. Hess, Lehigh University
GaryE.Wnek Rensselaer Polytechnic Institute
696 A Analytical Chemistry, December 1, 1995
In AC
Research
Umeâ (Sweden) describe a catalytic SPD reactor for an immobilized chemiluminescence system. The authors investigate six amino polycyclic aromatic hydrocarbons immobilized on various supports for their suitability in solid-phase peroxyoxalate chemiluminescence detection. ("Immobilized Amino Aromatics for Solid-Phase Detection Using Imidazole-Mediated Bis(trichlorophenyl) Oxalate Chemiluminescence"; AC950667H; p. 4302) Analyzing multicomponent solid state NMR spectra When magic angle spinning NMR samples contain a mixture of chemically similiar components with nearly identical isotropic chemical shifts, analysis of the resultant spectrum's line shape is often complex. Jeff M. Koons of the University of South Carolina and Paul D. Ellis of Pacific Northwest Laboratory describe an abstract factor analysis target transformation technique that can be used to determine the number of constituents present and the component MAS NMR spectra. Compared with the conventional least-squares approach, the new technique demonstrates improved precision and accuracy. ("Applicability of Factor Analysis in Solid State NMR"; AC950499T; p. 4309) Raman chemical imaging Chemical imaging is an emerging area of study that provides rapid probing of material chemical heterogeneity at high spatial resolution and with molecular specificity. Patrick J. Treado and colleagues at the University of Pittsburgh and Bayer describe the application of Raman chemical imaging microscopy for visualizing polypropylene-polyurethane blends. The authors report that their Raman imaging is complementary to electron microscopy for polymer blend characterization but requires less extensive sample preparation. ("Raman Chemical Imaging: Noninvasive Visualization of Polymer Blend Architecture"; AC950767N; p. 4316) REMPI for methyl-substituted cyclohexanes Saturated six-membered rings are commonly found as structural components in biologically interesting systems. Tomas Baer and colleagues at the University of North Carolina evaluate 2+1 resonance-enhanced multiphoton ionization spectroscopy as a tool for stereochemically analyzing methyl-substituted cyclohexanes. They derive three additive shift parameters and use them to predict transition origins to within an average error of ± 58 cirf ' for 14 different methylcyclohexanes. They also find a correlation between the molecular ground-state steric properties and the 3s
