비의류제품

circular dichroism measurements of thiophenophanes and binaphthyl-descendants in the vuv-region with a recent facility at hasylab

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 470
solutions of binaphthyl-derivatives, methylesters of a helical skeleton of the cyclophane type and combinations of these structure units have been measured in an absorption type cd experiment between 200 nm and 160 nm using synchrotron radiation as a continuum light source. assignments of exciton chirality were made according to the cd exciton coupling mechanism. in the case of the well known /sup 1/b/sub b/ transition the combined units neither do change their chirality nor do they develop strong exciton coupling between themselves. below 200 nm two new transitions had been accessed' cd data allow to distinguish between x to c and the x to d transition which strongly overlap in the absorption spectra. by comparison of acetonitrile and hexafluoroisopropanol solution data they could be determined as a rydberg transition and a molecular valence transition, the latter showing a bisignate cd cotton effect
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