Highly Stable, Low Gas Crossover, Proton-Conducting Phenylated Polyphenylenes
作者:Michael Adamski、Thomas J. G. Skalski、Benjamin Britton、Timothy J. Peckham、Lukas Metzler、Steven Holdcroft
DOI:10.1002/anie.201703916
日期:2017.7.24
membrane‐electrode assemblies containing each ionomermembrane yield high in situ proton conductivity and peak power densities that are greater than obtained using Nafion reference membranes. In situ chemical stability accelerated stress tests reveal that this class of the polyaromatic membranes allow significantly lower gas crossover and lower rates of degradation than Nafion benchmark systems. These results point
Absorption and Fluorescence Spectroscopic Properties of 1- and 1,4-Silyl-Substituted Naphthalene Derivatives
作者:Hajime Maeda、Tomohiro Maeda、Kazuhiko Mizuno
DOI:10.3390/molecules17055108
日期:——
naphthalene derivatives at the 1- and 1,4-positions were synthesized and their UV absorption, fluorescence spectroscopic properties, and fluorescence lifetimes were determined. Analysis of the results shows that the introduction of silyl groups at these positions of the naphthalene chromophore/fluorophore causes shifts of the absorption maxima to longer wavelengths and increases in fluorescence intensities
Emission and transient absorption measurements of substitution effects of C–C triple bonds on relaxation processes of the fluorescent state of naphthalenes
Photophysical and photochemical properties of naphthalenes substituted with trimethylsilylethynyl, tert-butylethynyl, and trimethylsilylbutadiynyl groups were investigated by measurement of fluorescence yields, lifetimes, and triplet absorption. Introducing trimethylsilylethynyl and tert-butylethynyl groups to the 1-position of the naphthalene skeleton substantially enhanced fluorescence and intersystem crossing (ISC). The rates of fluorescence of 2-substituted naphthalenes were low. The effect of ethynyl groups on the 1-substituted naphthalenes was rationalized in terms of an increase of the transition moment along the short axis of the naphthalene skeleton. Substitution of the trimethylsilylbutadiynyl group at the 1 or 2-position of the naphthalene skeleton caused a considerable decrease in the fluorescence yield (approximately 0.01) and an increase in the ISC yield (0.99).
Complexation of the (η<sup>5</sup>-Cp)Ru<sup>+</sup> and (η<sup>5</sup>-Cp*)Ru<sup>+</sup> Arenophiles on Alkynylnaphthalene: Solvent Effect on the Regioselectivity and the Haptotropic Rearrangement
作者:Rim Makhoul、Jennifer A. Shaw-Taberlet、Hiba Sahnoune、Vincent Dorcet、Samia Kahlal、Jean-François Halet、Jean-René Hamon、Claude Lapinte
DOI:10.1021/om500654d
日期:2014.11.10
reactions of [Cp*Ru(NCMe)3](PF6) and 1,4-R-C6H4-C≡C-SiMe3 (R = Me, C≡C-SiMe3; Cp* = η5-C5Me5) in CH2Cl2 provided the complexes [Cp*Ru(η6-4-MeC6H4-C≡C-SiMe3)](PF6) (1) and [Cp*Ru(η6-1,4-C6H4(C≡C-SiMe3)2](PF6) (2) in 65% yield. A similar reaction using 1-(trimethylsilylethynyl)naphthalene provided the complexes [Cp*Ru(η6-C10H7(C≡C-SiMe3))](PF6), bearing the Cp*Ru+ arenophile on the monosubstituted (3A) or
Synthesis, characterisation and optical spectroscopy of platinum(<scp>ii</scp>) di-ynes and poly-ynes incorporating condensed aromatic spacers in the backbone
作者:Muhammad S. Khan、Muna R. A. Al-Mandhary、Mohammed K. Al-Suti、Fathiya R. Al-Battashi、Sultan Al-Saadi、Birte Ahrens、Jens K. Bjernemose、Mary F. Mahon、Paul R. Raithby、Muhammad Younus、Nazia Chawdhury、Anna Köhler、Elizabeth A. Marseglia、Emilio Tedesco、Neil Feeder、Simon J. Teat
DOI:10.1039/b405070c
日期:——
electron-rich naphthalene and anthracene spacers create strong donor–acceptor interactionsbetween the Pt(II) centres and conjugated ligands along the rigid backbone of the organometallic polymers. Thermogravimetry shows that the di-ynes possess a somewhat higher thermal stability than the corresponding poly-ynes. Both the Pt(II) di-ynes and the poly-ynes exhibit increasing thermal stability along the
通过主链上的稠合芳族连接基单元,1,4-双(三甲基甲硅烷基乙炔基)萘2a扩展了π共轭作用的一系列受保护的和末端的二炔基,1,4-双(乙炔基)萘,2b,9,10-双(三甲基甲硅烷基乙炔基)蒽 3A,9,10-双(乙炔基)蒽 通过光谱合成和表征了图3b。2a和3a的固态结构已通过单晶X射线衍射学习。在i Pr 2 NH-CH 2 Cl中,两当量的复杂反式-[Ph(Et 3 P)2 PtCl]与当量的末端二炔1,4-双(乙炔基)苯1b和2b-3b反应2,在室温下,在CuI存在下,可得到铂(II)二炔反式-[Ph(Et 3 P)2 Pt– CC C–R– CC C–Pt(PEt 3)2 Ph]( R =苯-1,4-二基1c ;萘-1,4-二基2c和蒽-9,10-二基3c),而在相同条件下等摩尔量的反式-[(n Bu 3 P)2 PtCl 2 ]和2b-3b之间的反应可轻松获得铂(II)聚炔反式-[-(n