Modular Synthesis of Spirocyclic Germafluorene-Germoles: A New Family of Tunable Luminogens
作者:Olena Shynkaruk、Gang He、Robert McDonald、Michael J. Ferguson、Eric Rivard
DOI:10.1002/chem.201503377
日期:2016.1.4
The zirconium‐mediated synthesis of a new class of air‐stable spirocyclicgermafluorene–germole (SGG) luminogens is reported. These species contain ring‐fused germafluorene and germole units that display color‐tunable fluorescence when peripheral aryl substituents are appended. Three distinct pathways are introduced for SGG modification (Stille, Suzuki–Miyaura, and zirconocene‐mediated couplings),
Understanding the Origin of Phosphorescence in Bismoles: A Synthetic and Computational Study
作者:Sarah M. Parke、Mary A. B. Narreto、Emanuel Hupf、Robert McDonald、Michael J. Ferguson、Frank A. Hegmann、Eric Rivard
DOI:10.1021/acs.inorgchem.8b00149
日期:2018.7.2
A series of bismuth heterocycles, termed bismoles, were synthesized via the efficient metallacycle transfer (Bi/Zr exchange) involving readily accessible zirconacycles. The luminescenceproperties of three structurally distinct bismoles were explored in detail via time-integrated and time-resolved photoluminescence spectroscopy using ultrafast laser excitation. Moreover, time-dependent density functional
Coaxing Solid-State Phosphorescence from Tellurophenes
作者:Gang He、William Torres Delgado、Devon J. Schatz、Christian Merten、Arash Mohammadpour、Lorenz Mayr、Michael J. Ferguson、Robert McDonald、Alex Brown、Karthik Shankar、Eric Rivard
DOI:10.1002/anie.201307373
日期:2014.4.25
The synthesis of the first examples of tellurophenes exhibiting phosphorescence in the solid state and under ambient conditions (room temperature and in air) is reported. Each of these main‐group‐element‐based emitters feature pinacolboronates (BPin) as ring‐appended side groups. The nature of the luminescence observed was also investigated using computational methods.
The Marriage of Metallacycle Transfer Chemistry with Suzuki–Miyaura Cross-Coupling To Give Main Group Element-Containing Conjugated Polymers
作者:Gang He、Le Kang、William Torres Delgado、Olena Shynkaruk、Michael J. Ferguson、Robert McDonald、Eric Rivard
DOI:10.1021/ja402242z
日期:2013.4.10
A versatile and general synthetic route for the synthesis of conjugated main group element-based polymers, previously inaccessible by conventional means, is reported. These polymers contain five-membered chalcogenophene rings based on S, Se, and Te, and we demonstrate that optoelectronic properties can be readily tuned via controlled atom substitution chemistry. In addition, regioregular hybrid th
报道了一种通用的通用合成路线,用于合成基于共轭主族元素的聚合物,以前无法通过常规手段获得。这些聚合物包含基于 S、Se 和 Te 的五元硫属元素环,并且我们证明可以通过受控原子取代化学轻松调整光电特性。此外,合成了区域规则杂化噻吩-硒吩-碲烯和硒吩-芴共聚物,以进一步说明所提出的金属环转移/交叉偶联聚合方法的范围。
Selective Placement of Bromide and Pinacolboronate Groups about a Tellurophene: New Building Blocks for Optoelectronic Applications
作者:William Torres Delgado、Fatemeh Shahin、Michael J. Ferguson、Robert McDonald、Gang He、Eric Rivard
DOI:10.1021/acs.organomet.6b00362
日期:2016.6.27
Selective protodeboronation of preformed phosphorescent di- and tetrapinacolboronate (BPin)-substituted tellurophenes controllably affords new tellurophene products that show photoluminescence or, in the case of tellurophenes lacking BPin groups at the 2,5-positions, nonemissive behavior; for comparison the protodeboronation of select thiophene and selenophenes is also reported. The resulting BPin-appended tellurophenes are promising candidates for postfunctionalization via Suzuki-Miyaura cross-coupling and can be effectively converted into their respective brominated tellurophene counterparts via treatment with excess CuBr2. It is expected from prior studies that these brominated tellurophenes will be suitable building blocks (and monomers) for the preparation of conjugated oligomers and polymers featuring narrower optical band gaps in relation to their lighter chalcogen analogues; in this regard preliminary Stille coupling chemistry is reported.