title: A new series of pyrimidine-containing linear molecules: their elegant crystal structures and intriguing photophysical properties.
abstract: A new series of aza-substituted analogues 3-5 based on the 1,4-bis(phenylethynyl)benzene moiety have been synthesized by the selective Pd-catalyzed Sonogashira coupling reaction from 5-bromo-2-iodopyrimidine (1). In these linear molecules, the dipolar pyrimidine moiety is introduced as a probe to investigate factors that control the intermolecular interactions over the crystal engineering. The results reveal that the manner of packing changes both dipolar interactions between linear pyrimidine-containing molecules and transition moments simultaneously, resulting in remarkably different photophysical properties. Due to their versatile dipole-dipole and face-to-face pi-piinteractions in a crystal motif, further applications on the design of ordered crystalline materials for the field effect transistors are promising.
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan. kenwong@ntu.edu.tw
authors.forename: Ken-Tsung
authors.initials: KT
authors.lastname: Wong
authors.forename: Fu-Chuan
authors.initials: FC
authors.lastname: Fang
authors.forename: Yi-Ming
authors.initials: YM
authors.lastname: Cheng
authors.forename: Pi-Tai
authors.initials: PT
authors.lastname: Chou
authors.forename: Gene-Hsiang
authors.initials: GH
authors.lastname: Lee
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang