Komplexsalze des α‐Methyl‐o‐phenanthrolins

Pfeiffer, P.; Christeleit, Winfried

doi:10.1002/prac.19381510402

Cited by 12 publications

(3 citation statements)

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“…[Fe II (phen) 3 ] 2+ and [Fe II (2-CH 3 -phen) 3 ] 2+ were prepared as reported previously (Pfeiffer & Christeleit, 1938;Irving et al, 1953). All the reagents were reagent-grade and used without further purification.…”

Section: Spin Crossover Transition Of [Fe II (Phen) 3 ] 2+mentioning

confidence: 99%

Capturing molecular structural dynamics by 100 ps time-resolved X-ray absorption spectroscopy

Sato

Nozawa

Ichiyanagi

et al. 2008

J Synchrotron Radiat

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An experimental set-up for time-resolved X-ray absorption spectroscopy with 100 ps time resolution at beamline NW14A at the Photon Factory Advanced Ring is presented. The X-ray positional active feedback to crystals in a monochromator combined with a figure-of-merit scan of the laser beam position has been utilized as an essential tool to stabilize the spatial overlap of the X-ray and laser beams at the sample position. As a typical example, a time-resolved XAFS measurement of a photo-induced spin crossover reaction of the tris(1,10-phenanthrorine)iron(II) complex in water is presented.

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Section: Spin Crossover Transition Of [Fe II (Phen) 3 ] 2+mentioning

confidence: 99%

Capturing molecular structural dynamics by 100 ps time-resolved X-ray absorption spectroscopy

Sato

Nozawa

Ichiyanagi

et al. 2008

J Synchrotron Radiat

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“…In addition, the very reactive isomer-polyhalomethane species may undergo chemical reactions with olefins ͑such as alkenes, terpenes, and other volatile organic compounds found in the lower atmosphere͒ [100][101][102][103][104][105][106][107][108][109] and release a halogen molecule ͑X-X͒ as a product in cyclopropanation and/or other reactions ͑see Sec. IV C͒.…”

Section: Possible Implications For Release Of Reactive Halogens Inmentioning

confidence: 99%

Transient resonance Raman spectroscopy and density functional theory investigation of iso-polyhalomethanes containing bromine and/or iodine atoms

Zheng

Fang

Phillips

2000

The Journal of Chemical Physics

103

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We report additional transient resonance Raman spectra and density functional theory computations for the products formed following ultraviolet photoexcitation of solution phase polyhalomethanes containing bromine and/or iodine atoms. We show that the iso-polyhalomethane photoproduct is responsible for the intense transient absorption band observed in the 350-470 nm region after ultraviolet excitation of polyhalomethanes in the solution phase. We examine the trends and correlation in the density functional theory optimized geometry and intense electronic absorption transition in the 350-470 nm region for the iso-polyhalomethanes containing bromine and/or iodine atoms. We explore the chemical reactivity of the iso-polyhalomethane species using density functional theory computations for the reaction of iso-CH 2 Br-Br with ethylene as an example. Our results and comparison with experimental data in the literature indicate that the iso-polyhalomethane species is most likely the methylene transfer agent in the cyclopropanation reactions of olefins using ultraviolet photoexcitation of polyhalomethanes in the solution phase. We briefly discuss the possibility that the photochemistry and chemistry of the iso-polyhalomethanes may give significant release of reactive halogens to the atmosphere.

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“…6,6'-Dicarboxy-2,2'-bipyridine gives an orange color, but this is undoubtedly due to chelation through the carboxyl group and nitrogen, as occurs in picolinic Since reagents normally attack phenanthroline in the benzenoid ring, 5 (or 6)derivatives are the easiest to obtain and a comparable series of 2-and 2,9- derivatives (XXVIII) has not yet been tested. However, the tris-2-methylphenanthroline iron(II) salts are of an orange color (147, 227) and recently have been shown to be of low stability. Though 2-methylphenanthroline is a stronger base (pKa = 5.42) than phenanthroline itself (pKa = 4.92), it forms much weaker complexes, pKi = 10.8, as compared with pXj-= 21.4 for Fe(phen)3++.…”

Section: Substitution and Steric Considerationsmentioning

confidence: 99%