title: 5,5'-Diazaisoindigo: an Electron-Deficient Building Block for Donor-Acceptor Conjugated Polymers.
abstract: A novel electron-deficient building block, 5,5'-diazaisoindigo (5DNIID), was synthesized through a facile method in good yield. As a derivative of isoindigo, 5DNIID shows an ultra-low LUMO level of -3.92 eV after incorporation of two electron-deficient nitrogen atoms into the para-position of the amine groups in the isoindigo π skeleton. Modified polymerization conditions were applied to efficiently afford the donor-acceptor (D-A) conjugated polymer 5DNIID-2T, which exhibited a p-type charge transport property.
authors.affiliation: Beijing National Laboratory for Molcular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Lu
authors.affiliation: College of Life Science, Shandong Normal University, Jinan, Shandong, 250014, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Molcular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Ya-Zhong
authors.initials: YZ
authors.lastname: Dai
authors.affiliation: Beijing National Laboratory for Molcular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Chi-Yuan
authors.initials: CY
authors.lastname: Yang
authors.affiliation: Beijing National Laboratory for Molcular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Hio-Ieng
authors.initials: HI
authors.lastname: Un
authors.affiliation: Beijing National Laboratory for Molcular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Si-Wei
authors.initials: SW
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Molcular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Shi
authors.affiliation: Beijing National Laboratory for Molcular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Jie-Yu
authors.initials: JY
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Molcular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Jian
authors.identifier: http://orcid.org/0000-0002-2222-5361
authors.initials: J
authors.lastname: Pei
keywords: conjugated polymers; diazaisoindigo; donor-acceptor systems; electron-deficient compounds