Nonlinear optical materials/comparisons of chromium carbene complex chemistry with ketene chemistry

onlinear optical (NLO) effects require materials which possess a high degree of molecular alignment. Our approach to the construction of NLO polymeric materials was to use the inherent molecular ordering properties of liquid crystals to attain highly aligned polymeric materials. Polymerizable functionalities were incorporated into a number of known liquid crystalline compounds in an attempt to obtain liquid crystalline monomers which could be macroscopically aligned prior to polymerization. Of the monomers prepared, none provided the properties required to construct NLO materials by our proposed procedure. However, a side chain liquid crystalline polymer which exhibits optical transparency to 300 nm has been prepared. Also, mesomorphic structure-property relationships were investigated. Incorporation of ;The reactivity and stereoselectivity of optically active nitrogen substituted ketene species generated from acid chlorides and chromium carbene complexes were compared with respect to reactions with imines giving...