Schluetter, Florian published the artcileSynthesis and Characterization of New Self-Assembled Metallo-Polymers Containing Electron-Withdrawing and Electron-Donating Bis(terpyridine) Zinc(II) Moieties, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Macromolecules (Washington, DC, United States) (2010), 43(6), 2759-2771, database is CAplus.
A series of rigid π-conjugated bis(terpyridines) (M1-M7) bearing electron-acceptor spacer units in 4′-position was synthesized in moderate to high yields by Pd0-catalyzed Sonogashira cross-coupling reactions. The compounds were fully characterized by NMR spectroscopy, MALDI-TOF mass spectrometry, elemental anal. and their photophys. properties were discussed in detail. These new bis(terpyridines) were applied for the self-assembly reaction with ZnII ions to form metallo-homo polymers (P1-P7). Broadened NMR signals and UV-vis titration experiments confirmed the successful polymerization The electro-optical properties of the materials were investigated in detail. Band gaps up to 2.08 eV and bright blue to orange photoluminescence with quantum yields of 18 to 66% were observed strongly depending on the nature of the π-conjugated bis(terpyridine) system. In combination with electron-donor ditopic terpyridine ligands (MD1 and MD2), two ZnII random copolymers (R1 and R2) were synthesized. These materials were investigated by UV-vis absorption and photoluminescence experiments in dilute solution and in the solid state, prepared by spin-coating from DMF solutions Thereby, random copolymer R2 featured an energy transfer from the donor to the acceptor part in dilute solution
Macromolecules (Washington, DC, United States) published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary