![]() The ultimate goal is to understand the relationshipbetween property and chemical structure and to engineer promisingmaterials as low k ILD.ĩ. ![]() One order of magnitude increase in modulus has beenachieved. Variouschemical structures have been engineered and film deposition processeshave been developed to improve the mechanical strength of thematerials. A major challenge forusing nanoporous materials as ILD is mechanical strength. Our primary interest hereis nanoporous silica and organic polymers. The dielectric constant is 4 for silica, whichis widely used as ILD currently, 3-4 for fluorinated silica, 2-3for organic polymers and organosilane, 1.5-2 for porous organicpolymers and silica, and k~1 for air. Chiang, IntelCorporation, Components Research, 3065 Bowers Avenue, Santa Clara,CA 95052.Īn interlayer dielectric (ILD) thin film with a reduced dielectricconstant (k) can improve interconnect performance in ULSI devicesby reducing signal delay within and cross-talk between the metallines it separates. NANOPOROUS MATERIALS FOR INTERLAYER DIELECTRICS IN ULSIDEVICES. Tetsuo Otsubo, Faculty of Engineering, Hiroshima University,Higashi-Hiroshima, 739-8527, Japan.Ĩ. TETRATHIAFULVALENOPHANES AS NOVEL ELECTRON DONORS. Bronstein, Department of Chemistry, Boston College,Chestnut Hill, MA 02467-3860.ħ. GEODESIC POLYARENES: RATIONAL SYNTHESES AND NOVEL PROPERTIES. A generalizationof the classical perimeter model will be presented that permitsthe treatment of the electronic absorption and magnetic circulardichroism of electron systems derived from aromatic as well asantiaromatic perimeters with equal ease and brings to light thesimilarities as well as the profound differences between the electronicstates of these two fundamental classes of cyclic conjugated molecules.Ħ. ![]() A complement to such calculations on individual moleculesis provided by simple models that permit simultaneous treatmentof whole classes of molecules, suggest rationalizations of excitedstate properties, and permit predictions of trends. Recent developments in quantum chemistry permit accurate calculationsof electronically excited states of conjugated molecules of respectablesize. JosefMichl*, Jörg Fleischhauer and Udo Höweler, Departmentof Chemistry and Biochemistry, University of Colorado, Boulder,CO 80309. SYSTEMATICS OF THE EXCITED STATES OF CYCLIC -ELECTRONSYSTEMS: AROMATIC TO ANTIAROMATIC UNDER ONE ROOF. I will discuss our latest results on the solid-statestructures and electronic properties of these novel compounds.ĥ. These compounds show unusual electrochemistry, and we haveprovided evidence for an unusual mode of delocalization in thesesystems. We have previously reported the synthesis and solution propertiesof the spiro-phenalenyls. Haddon, Departments of Chemistry and Physics,University of Kentucky, Lexington, KY 40506-0055. SPIRO-PHENALENYLS: A NEW TWIST ON AN OLD IDEA. Aspectsof these ongoing projects will be presented.Ĥ. Further extension hasbeen feasible to encompass DreM for the construction of substitutedthioxanthones, xanthones, acridones, and dibenzophosphorinones.The Grubbs metathesis - DoM connection has allowed the synthesisof aromatics annelated to large heteroatom-containing rings. ![]() The discoveryof Directed remote Metalation (DreM) led to the generalizationof regiospecific strategies to fluorenones, highly substitutedbiaryls, and polyaryls and polycondensed aromatic systems, andsome of their heteroaromatic analogues. Recent developments in extensions and diversifications of Directed ortho Metalation (DoM) have included connections to varioustransition metal catalyzed cross coupling reactions. Victor Snieckus,Department of Chemistry, Queen's University, Kingston, Canada,K7L 3N6. THE EMERGING CENTRALITY OF THE DIRECTED ORTHO METALATION REACTION IN SYNTHETIC AROMATIC CHEMISTRY. Ward*, and Yunxia Wang, Department of Chemistry,University of Victoria, Victoria, BC V8W 2Y2.Įlaboration of the dimethyldihydropyrene - cyclophanediene(DMDHP - CPD) photoswitch gives compound I, which has two distinctphotoisomers accessible from the ground state I. PI-SWITCHES: MULTI-STATE THERMAL AND PHOTOCHEMICAL SWITCHESDERIVED FROM DIMETHYLDIHYDROPYRENES. Marye AnneFox, Chancellor, North Carolina State University, Raleigh,NC 27695.Ģ. PHOTOCHEMISTRY IN SELF-ASSEMBLED MONOLAYERS. (paper copy) means we will be xeroxing the abstract as submitted,usually due to the complexity of the structure and/or the absenceof a file copy of the structure. Note - indicates that there is a structure orfigure at that point, all of which are present and generally lookingjust fine in the text copy that will make up the Abstract Book.Īlso keep in mind that some Greek letters, subscripts, andother special characters may not have translated well to html. NORM '99 - Abstracts NORM '99 - List of Abstracts Version 4 ( )
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