Marcin Brynda - Academia.edu (original) (raw)
Papers by Marcin Brynda
Journal of the American Chemical Society, 2007
... Department of Chemistry, University of California, Davis, California 95616, and Department of... more ... Department of Chemistry, University of California, Davis, California 95616, and Department of Chemistry, University of Missouri Rolla, Rolla, Missouri 65409-0010. J. Am. Chem. Soc. ... Organometallic Chemistry; Wilkinson, G., Ed.; Pergamon: Oxford, 1982; Vol. 3, pp 975−1054. ...
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Inorganic Chemistry, 2007
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Chemical Physics Letters, 2009
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Chemical Communications, 2008
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Angewandte Chemie International Edition, 2009
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Journal of the American Chemical Society, Sep 5, 2007
Mn doped Si nanoparticles have been synthesized via a low-temperature solution route and characte... more Mn doped Si nanoparticles have been synthesized via a low-temperature solution route and characterized by X-ray powder diffraction, transmission electron microscopy, optical and emission spectroscopy, and by electron paramagnetic resonance (EPR). The particle diameter was 4 nm, and the surface was capped by octyl groups. Mn doping at 5% resulted in a green emission with a slightly lower quantum yield than undoped Si nanoparticles prepared by the same method. Mn2+ doped into the nanoparticle is confirmed by EPR ...
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Chemical Communications, Nov 20, 2008
Dihydrogen reacts directly with a range of distannynes at ca. 25 degrees C under one atmosphere p... more Dihydrogen reacts directly with a range of distannynes at ca. 25 degrees C under one atmosphere pressure to afford symmetric hydrogen bridged or unsymmetric stannylstannane products in high yield.
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Journal of the American Chemical Society Jacs, 2004
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Journal of Organometallic Chemistry, May 15, 2006
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Inorganic Chemistry, 2005
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J Organomet Chem, 2006
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J Am Chem Soc, 2007
The synthesis and structural characterization of the first homologous, molecular M-M bonded serie... more The synthesis and structural characterization of the first homologous, molecular M-M bonded series for the group 12 metals are reported. The compounds Ar'MMAr' (M = Zn, Cd, or Hg; Ar' = C(6)H(3)-2,6-(C(6)H(3)-2,6-Pr(i)(2))(2)) were synthesized by reduction of the corresponding arylmetal halides by alkali metal/graphite (Zn or Hg) or sodium hydride (Cd). These compounds possess almost linear C-M-M-C core structures with two-coordinate metals. The observed M-M bonds distances were 2.3591(9), 2.6257(5), and 2.5738(3) A for the zinc, cadmium, and mercury species, respectively. The shorter Hg-Hg bond in comparison to that of Cd-Cd is consistent with DFT calculations which show that the strength of the Hg-Hg bond is greater. The arylmetal halides precursors (Ar'MI)(1 or 2), and the highly reactive hydrides (Ar'MH)(1 or 2), were also synthesized and fully characterized by X-ray crystallography (Zn and Cd) and multinuclear NMR spectroscopy. The arylzinc and arylcadmium iodides have iodide-bridged dimeric structures, whereas the arylmercury iodide, Ar'HgI, is monomeric. The arylzinc and arylcadmium hydrides have symmetric (Zn) or unsymmetric (Cd) mu-H-bridged structures. The Ar'HgH species was synthesized and…
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J Am Chem Soc, 2005
A sequence of first row transition metal(II) dithiolates M(SAr)(2) (M = Cr(1), Mn(2), Fe(3), Co(4... more A sequence of first row transition metal(II) dithiolates M(SAr)(2) (M = Cr(1), Mn(2), Fe(3), Co(4), Ni(5) and Zn(6); Ar = C(6)H(3)-2,6-(C(6)H(2)-2,4,6-Pr(i)(3))(2)) has been synthesized and characterized. Compounds 1-5 were obtained by the reaction of two equiv of LiSAr with a metal dihalide, whereas 6 was obtained by treatment of ZnMe(2) with 2 equiv of HSAr. They were characterized by spectroscopy, magnetic measurements, and X-ray crystallography. The dithiolates 1, 2, and 4-6 possess linear or nearly linear SMS units with further interactions between M and two ipso carbons from C(6)H(2)-2,4,6-Pr(i)(3) rings. The iron species 3, however, has a bent geometry, two different Fe-S distances, and an interaction between iron and one ipso carbon of a flanking ring. The secondary M-C interactions vary in strength in the sequence Cr(2+) approximately Fe(2+) > Co(2+) approximately Ni(2+) > Mn(2+) approximately Zn(2+) such that the manganese and zinc compounds have essentially two coordination but the chromium and iron complexes are quasi four and three coordinate, respectively. The geometric distortions in the iron species 3 suggested that the structure represents the initial stage of a rearrangement into a sandwich structure involving metal-aryl ring coordination. The bent structure of 3 probably also precludes the observation of free ion magnetism of Fe(2+) recently reported for Fe{C(SiMe(3))(3)}(2). DFT calculations on the model compounds M(SPh)(2) (M = Cr-Ni) support the higher tendency of the iron species to distort its geometry.
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Magnetic doping of semiconductor nanostructures is pursued for applications in magnetic memory an... more Magnetic doping of semiconductor nanostructures is pursued for applications in magnetic memory and spin-based electronics. A primary goal is to control interactions between carriers (electrons and holes) and the embedded magnetic atoms. We have demonstrated^* a tunable magnetic sp-d exchange interaction between electron-hole excitations and paramagnetic Mn^2+ ions using `inverted' core-shell nanocrystals composed of Mn^2+-doped ZnSe cores overcoated with undoped
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The paper shows the possibilities of the complementary use of the density matrix formalism for th... more The paper shows the possibilities of the complementary use of the density matrix formalism for the simulation of the anisotropic EPR spectra and the DFT potential energy surface calculations to obtain a detailed picture of the motions of radical molecules. The combined approach is illustrated by a comparative EPR study of three phosphorus derivatives of barrelene. Three compounds were chosen as the model molecules for the observation of different temperature depend-ent dynamics of radical fragment. Each molecule based on the same barrelene skeleton has a different set of substitu-ents which by influencing the local chemical environment are likely to modify the internal dynamics. The temperature dependent EPR spectra are simulated by means of the density matrix formalism and the geometry of radicals are calcu-lated with DFT. The motion is described in terms of rotational barriers, DFT calculated energy profiles and hypotheti-cal intramolecular distortions. These two approaches lead t...
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Biological Magnetic Resonance, 2009
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Coordination Chemistry Reviews, 2005
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Biomedical Applications of Biophysics, 2010
The acronym EPR describes a spectroscopic technique known as electron paramagnetic resonance.In s... more The acronym EPR describes a spectroscopic technique known as electron paramagnetic resonance.In several, especially older, textbooks and research papers the alternative names ESR(electron spin resonance) or EMR (electron magnetic resonance) can be sometimes encountered.The development of EPR spectroscopy was slowed during the few decades following its inventiondue to the unavailability of microwave components for higher frequencies. Today, however, EPR technologies are enjoying very rapid development in all areas of application. Such regained interest is related to the fact that EPR not only proved to be an extremely powerful spectroscopic technique but to an increasing amount of related techniques that were born around EPR methodology. Recent developments in the area of instrumentation followed by the commercialization of high-end EPR spectrometers have attracted many new adepts who benefit from exploring this technique in their specific fields of research.
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Journal of the American Chemical Society, 2007
... Department of Chemistry, University of California, Davis, California 95616, and Department of... more ... Department of Chemistry, University of California, Davis, California 95616, and Department of Chemistry, University of Missouri Rolla, Rolla, Missouri 65409-0010. J. Am. Chem. Soc. ... Organometallic Chemistry; Wilkinson, G., Ed.; Pergamon: Oxford, 1982; Vol. 3, pp 975−1054. ...
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Inorganic Chemistry, 2007
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Chemical Physics Letters, 2009
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Chemical Communications, 2008
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Angewandte Chemie International Edition, 2009
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Journal of the American Chemical Society, Sep 5, 2007
Mn doped Si nanoparticles have been synthesized via a low-temperature solution route and characte... more Mn doped Si nanoparticles have been synthesized via a low-temperature solution route and characterized by X-ray powder diffraction, transmission electron microscopy, optical and emission spectroscopy, and by electron paramagnetic resonance (EPR). The particle diameter was 4 nm, and the surface was capped by octyl groups. Mn doping at 5% resulted in a green emission with a slightly lower quantum yield than undoped Si nanoparticles prepared by the same method. Mn2+ doped into the nanoparticle is confirmed by EPR ...
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Chemical Communications, Nov 20, 2008
Dihydrogen reacts directly with a range of distannynes at ca. 25 degrees C under one atmosphere p... more Dihydrogen reacts directly with a range of distannynes at ca. 25 degrees C under one atmosphere pressure to afford symmetric hydrogen bridged or unsymmetric stannylstannane products in high yield.
Bookmarks Related papers MentionsView impact
Journal of the American Chemical Society Jacs, 2004
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Journal of Organometallic Chemistry, May 15, 2006
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Inorganic Chemistry, 2005
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J Organomet Chem, 2006
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J Am Chem Soc, 2007
The synthesis and structural characterization of the first homologous, molecular M-M bonded serie... more The synthesis and structural characterization of the first homologous, molecular M-M bonded series for the group 12 metals are reported. The compounds Ar'MMAr' (M = Zn, Cd, or Hg; Ar' = C(6)H(3)-2,6-(C(6)H(3)-2,6-Pr(i)(2))(2)) were synthesized by reduction of the corresponding arylmetal halides by alkali metal/graphite (Zn or Hg) or sodium hydride (Cd). These compounds possess almost linear C-M-M-C core structures with two-coordinate metals. The observed M-M bonds distances were 2.3591(9), 2.6257(5), and 2.5738(3) A for the zinc, cadmium, and mercury species, respectively. The shorter Hg-Hg bond in comparison to that of Cd-Cd is consistent with DFT calculations which show that the strength of the Hg-Hg bond is greater. The arylmetal halides precursors (Ar'MI)(1 or 2), and the highly reactive hydrides (Ar'MH)(1 or 2), were also synthesized and fully characterized by X-ray crystallography (Zn and Cd) and multinuclear NMR spectroscopy. The arylzinc and arylcadmium iodides have iodide-bridged dimeric structures, whereas the arylmercury iodide, Ar'HgI, is monomeric. The arylzinc and arylcadmium hydrides have symmetric (Zn) or unsymmetric (Cd) mu-H-bridged structures. The Ar'HgH species was synthesized and…
Bookmarks Related papers MentionsView impact
J Am Chem Soc, 2005
A sequence of first row transition metal(II) dithiolates M(SAr)(2) (M = Cr(1), Mn(2), Fe(3), Co(4... more A sequence of first row transition metal(II) dithiolates M(SAr)(2) (M = Cr(1), Mn(2), Fe(3), Co(4), Ni(5) and Zn(6); Ar = C(6)H(3)-2,6-(C(6)H(2)-2,4,6-Pr(i)(3))(2)) has been synthesized and characterized. Compounds 1-5 were obtained by the reaction of two equiv of LiSAr with a metal dihalide, whereas 6 was obtained by treatment of ZnMe(2) with 2 equiv of HSAr. They were characterized by spectroscopy, magnetic measurements, and X-ray crystallography. The dithiolates 1, 2, and 4-6 possess linear or nearly linear SMS units with further interactions between M and two ipso carbons from C(6)H(2)-2,4,6-Pr(i)(3) rings. The iron species 3, however, has a bent geometry, two different Fe-S distances, and an interaction between iron and one ipso carbon of a flanking ring. The secondary M-C interactions vary in strength in the sequence Cr(2+) approximately Fe(2+) > Co(2+) approximately Ni(2+) > Mn(2+) approximately Zn(2+) such that the manganese and zinc compounds have essentially two coordination but the chromium and iron complexes are quasi four and three coordinate, respectively. The geometric distortions in the iron species 3 suggested that the structure represents the initial stage of a rearrangement into a sandwich structure involving metal-aryl ring coordination. The bent structure of 3 probably also precludes the observation of free ion magnetism of Fe(2+) recently reported for Fe{C(SiMe(3))(3)}(2). DFT calculations on the model compounds M(SPh)(2) (M = Cr-Ni) support the higher tendency of the iron species to distort its geometry.
Bookmarks Related papers MentionsView impact
Magnetic doping of semiconductor nanostructures is pursued for applications in magnetic memory an... more Magnetic doping of semiconductor nanostructures is pursued for applications in magnetic memory and spin-based electronics. A primary goal is to control interactions between carriers (electrons and holes) and the embedded magnetic atoms. We have demonstrated^* a tunable magnetic sp-d exchange interaction between electron-hole excitations and paramagnetic Mn^2+ ions using `inverted' core-shell nanocrystals composed of Mn^2+-doped ZnSe cores overcoated with undoped
Bookmarks Related papers MentionsView impact
The paper shows the possibilities of the complementary use of the density matrix formalism for th... more The paper shows the possibilities of the complementary use of the density matrix formalism for the simulation of the anisotropic EPR spectra and the DFT potential energy surface calculations to obtain a detailed picture of the motions of radical molecules. The combined approach is illustrated by a comparative EPR study of three phosphorus derivatives of barrelene. Three compounds were chosen as the model molecules for the observation of different temperature depend-ent dynamics of radical fragment. Each molecule based on the same barrelene skeleton has a different set of substitu-ents which by influencing the local chemical environment are likely to modify the internal dynamics. The temperature dependent EPR spectra are simulated by means of the density matrix formalism and the geometry of radicals are calcu-lated with DFT. The motion is described in terms of rotational barriers, DFT calculated energy profiles and hypotheti-cal intramolecular distortions. These two approaches lead t...
Bookmarks Related papers MentionsView impact
Biological Magnetic Resonance, 2009
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Coordination Chemistry Reviews, 2005
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Biomedical Applications of Biophysics, 2010
The acronym EPR describes a spectroscopic technique known as electron paramagnetic resonance.In s... more The acronym EPR describes a spectroscopic technique known as electron paramagnetic resonance.In several, especially older, textbooks and research papers the alternative names ESR(electron spin resonance) or EMR (electron magnetic resonance) can be sometimes encountered.The development of EPR spectroscopy was slowed during the few decades following its inventiondue to the unavailability of microwave components for higher frequencies. Today, however, EPR technologies are enjoying very rapid development in all areas of application. Such regained interest is related to the fact that EPR not only proved to be an extremely powerful spectroscopic technique but to an increasing amount of related techniques that were born around EPR methodology. Recent developments in the area of instrumentation followed by the commercialization of high-end EPR spectrometers have attracted many new adepts who benefit from exploring this technique in their specific fields of research.
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