Astrochemistry

Straughan, B. P.; Walker, S.

doi:10.1007/978-94-009-5741-1_6

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…From the quantum yields Φ em and the τ lifetime values, the radiative decay rate ( k r ), the nonradiative decay rate ( k nr ), and the pure radiative lifetime (τ r ) were calculated for a series of complexes through the equations k r = Φ em /τ, k nr = (1 – Φ em )/τ, and τ r ≈ τ/Φ em (see Table ). Thus, the emission quantum yield (Φ em ) is generally formulated as Φ em = k r /( k r + k nr ).…”

Section: Resultsmentioning

confidence: 99%

Orange-Red Phosphorescent Iridium(III) Complexes Bearing Bisphosphine Ligands: Synthesis, Photophysical and Electrochemical Properties, and DFT Calculations

Dou

Zheng

et al. 2017

Organometallics

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Nine new phosphorus-coordinated iridium(III) complexes of the form [Ir(C∧N)2(P∧P)]PF6, [Ir(F-piq)2(xantphos)]PF6 (1), [Ir(F-piq)2(binap)]PF6 (2), [Ir(F-piq)2(dppp)]PF6 (3), [Ir(Me-piq)2(xantphos)]PF6 (4), [Ir(Me-piq)2(binap)]PF6 (5), [Ir(Me-piq)2(dppp)]PF6 (6), [Ir(CF3O-piq)2(xantphos)]PF6 (7), [Ir(CF3O-piq)2(binap)]PF6 (8), and [Ir(CF3O-piq)2(dppp)]PF6 (9) (F-piq = 1-(4-fluorophenyl)isoquinoline, Me-piq = 1-(p-tolyl)isoquinoline, CF3O-piq = 1-(4-(trifluoromethoxy)phenyl)isoquinoline, xantphos = 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene, binap = 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl, dppp = 1,3-bis(diphenylphosphanyl)propane), have been synthesized and fully characterized. The crystal structures of 1, 7, and 9 have been determined by X-ray analysis. The most representative molecular orbital energy-level diagrams and the lowest energy electronic transitions of 1–9 have been calculated with density functional theory (DFT) and time-dependent DFT (TD-DFT). All of the complexes are orange-red emissive with quantum efficiencies of 3.2–24.4% and lifetimes of 1.77–3.19 μs in degassed CH2Cl2 solution at room temperature. These research results reveal that the Me-piq C∧N ligand and xantphos P∧P ligand are beneficial for a red shift of absorption and emission wavelength. Complex 4 has better charge transfer ability, which probably promises its use as a red-phosphorescent material.

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Section: Resultsmentioning

confidence: 99%

Orange-Red Phosphorescent Iridium(III) Complexes Bearing Bisphosphine Ligands: Synthesis, Photophysical and Electrochemical Properties, and DFT Calculations

Dou

Zheng

et al. 2017

Organometallics

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“…Infrared spectroscopy, however, is not without its drawbacks. It is well-known that glass is quite unsuitable for any type of optics (e.g., lenses, widows, or sample slides) because of its opacity over most of the useful mid-infrared region of the spectrum. − In order to analyze a biopsy sample, therefore, the slice of tissue either has to be placed on a mid-infrared transparent substrate such a calcium fluoride (CaF 2 ) or barium fluoride (BaF 2 ) for a transmission measurement or on a highly reflecting substrate for a, so-called, transflection measurement. In the case of a transmission measurement the substrates are expensive (typically greater than $40 per slide) and are far from robust.…”

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confidence: 99%

Transmission FT-IR Chemical Imaging on Glass Substrates: Applications in Infrared Spectral Histopathology

et al. 2014

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Fourier transform-infrared (FT-IR) chemical imaging in transmission mode has traditionally been performed on expensive mid-IR transparent windows such as barium/calcium fluoride, which are more fragile than glass, making preparation in the histopathology laboratories more cumbersome. A solution is presented here by using cheap glass substrates for the FT-IR chemical imaging, which has a high-wavenumber transmission window allowing measurement of the C-H, N-H, and O-H stretches occurring at ca. 2500-3800 cm(-1). The "fingerprint" region of the IR spectrum occurring below 1800 cm(-1) is not obtainable; however, we demonstrate that a wealth of information is contained in the high wavenumber range using 71 patients on a breast tissue microarray (TMA) as a model for investigation. Importantly, we demonstrate that the tissue can be classified into four basic tissue cell types and that using just the epithelial cells, reasonable discrimination of normal and malignant tissue can be found.

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“…Astronomical objects produce spectra in both emission and absorption (Thackeray 1961, Straughan andWalker 1976). The simulator does the same, generating an array of 'stars' in an imaginary constellation by various methods.…”

Section: The Stellar Spectra Simulatormentioning

confidence: 99%

Simulators for assisting the teaching of observational astronomy. Part I: Stellar spectrography

1983

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Astrochemistry

Cited by 3 publications

References 23 publications

Orange-Red Phosphorescent Iridium(III) Complexes Bearing Bisphosphine Ligands: Synthesis, Photophysical and Electrochemical Properties, and DFT Calculations

Orange-Red Phosphorescent Iridium(III) Complexes Bearing Bisphosphine Ligands: Synthesis, Photophysical and Electrochemical Properties, and DFT Calculations

Transmission FT-IR Chemical Imaging on Glass Substrates: Applications in Infrared Spectral Histopathology

Simulators for assisting the teaching of observational astronomy. Part I: Stellar spectrography

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