70728-93-7Relevant academic research and scientific papers
Simultaneous expansion of 9,10 boron-doped anthracene in longitudinal and lateral directions
John, Alexandra,Kirschner, Sven,Fengel, Melina K.,Bolte, Michael,Lerner, Hans-Wolfram,Wagner, Matthias
supporting information, p. 1871 - 1877 (2019/02/28)
Doubly boron-doped anthracenes and pentacenes have been longitudinally and laterally expanded through annulation of thiophene or benzene rings. The obtained series of closely related compounds allowed an assessment of key structure-property relationships with a focus on optoelectronic characteristics. Most of the products are benchtop-stable blue emitters and capable of accepting two electrons in a reversible manner. The syntheses involved late-stage modifications through photocyclization or stepwise oxidative C-C coupling (DDQ/BF3·Et2O) as well as cyclocondensation of ortho-disilylated or -diborylated aryl building blocks.
Strongly Luminescent Cyclometalated Gold(III) Complexes Supported by Bidentate Ligands Displaying Intermolecular Interactions and Tunable Emission Energy
Chan, Kaai Tung,Tong, Glenna So Ming,Wan, Qingyun,Cheng, Gang,Yang, Chen,Che, Chi-Ming
supporting information, p. 2104 - 2120 (2017/08/23)
A series of charge-neutral AuIII complexes, which comprise a dicarbanionic C-deprotonated biphenyl ligand and bidentate ancillary ligands ([Au(C^C)(L^X)]; L^X=β-diketonate and relatives (O^O), quinolinolate and relatives (N^O), and diphosphino (P^P) ligands), were prepared. All the complexes are emissive in degassed CH2Cl2 solutions and in thin-film samples with Φem up to 18 and 35 %, respectively, except for 5 and 6, which bear (N^O)-type ancillary ligands. Variation of the electronic characteristics of the β-diketonate ancillary ligand was demonstrated to be a viable route for tuning the emission color from blue-green (peak λem at ca. 466 nm for 1 and 2; 501 nm for 4 a and 4 b) to orange (peak λem at 585 nm for 3), in contrast to the common observations that the ancillary ligand has a negligible effect on the excited-state energy of the AuIII complexes reported in the literature. DFT/time-dependent (TD) DFT calculations revealed that the energies of the 3ππ*(C^C) and the 3ILCT(O^O) excited states (ILCT=intraligand charge transfer) switch in order on going from O^O=acetylacetonate (acac) to aryl-substituted β-diketonate ligands. Solution-processed and vacuum-deposited organic light-emitting diode (OLED) devices of selected complexes were prepared. The vacuum-deposited OLED fabricated with 2 displays a sky-blue emission with a maximum external quantum efficiency (EQE) of 6.71 % and CIE coordinates of (0.22, 0.40). The crystal structures of 7 and 9 reveal short intermolecular AuIII???AuIII contacts, with intermetal distances of 3.408 and 3.453 ?, respectively. DFT/TDDFT calculations were performed on 7 and 9 to account for the noncovalent interactions. Solid samples of 1, 3, and 9 exhibit excimeric emission at room temperature, which is rarely reported in AuIII complexes.
Synthesis of ladder-type graphene ribbon oligomers from pyrene units
Liu, Feng,Shen, Xiaoxiao,Wu, Yonggang,Bai, Libin,Zhao, Hongchi,Ba, Xinwu
supporting information, p. 4157 - 4161 (2016/08/24)
A series of ladder-type graphene ribbon oligomers have been synthesized through DDQ/acid-mediated oxidative cyclization. The oligomers present a bright blue light emission, and the new oligomers were clearly characterized by NMR and MALDI-TOF.
Gold(iii) compounds containing a chelating, dicarbanionic ligand derived from 4,4′-di-tert-butylbiphenyl
David,Monkowius,Rust,Lehmann,Hyzak,Mohr
, p. 11059 - 11066 (2014/07/08)
An oligomeric gold(iii) compound containing dicarbanionic chelating 4,4′-di-tert-butylbiphenyl was prepared via transmetallation using the corresponding organotin(iv) compound. The reactivity of the chloro-bridged oligomer with various species including neutral N-, P-, and C-donor ligands as well as monoanionic S- and Se-ligands was investigated. Some of the products were characterised by X-ray crystallography. The photophysical properties of two derivatives were studied.
The superbase-mediated pairwise substitution of the 2,2′- and 6,6′-positions in a biphenyl derivative
Schlosser, Manfred,Mangano, Guiseppe,Leroux, Frederic
, p. 1014 - 1017 (2007/10/03)
The superbasic mixture of butyllithium and potassium tertbutoxide is powerful enough to enable the double proton abstraction from one ortho and one ortho′ position of 4,4′-di-tert-butylbiphenyl. In this way, a series of functionalized derivatives becomes readily accessible, among them 4,4′-di-tert-butylbiphenyldiyl-2,2′-dicarboxylic acid (2a) and 4,4′-ditert-butylbiphenyl-2,2′-diol (2d). The latter compound can be subjected again to a superbase-promoted double metalation, thus giving rise to 2,2′,6,6′-tetrasubstituted biphenyl derivatives. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
NEW PRECURSORS TO SILAFLUORENES
Corey, Joyce Y.,Chang, Lihsueh S.
, p. 7 - 14 (2007/10/02)
Conversion of 2,2'-dibromo-4,4'-di-t-butylbiphenyl and o-bromo-o'-chlorobiphenyl to organometallic reagents suitable for reaction with Me2SiCl2 to produce silafluorene has been developed.
