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204 results on '"Frieder Jäkle"'

201. Group 13 Chemistry

Author

Pamela J. Shapiro, David A. Atwood, Ned J. Hardman, Andrew D. Phillips, Philip P. Power, L. O. Schebaum, P. Jutzi, Thomas P. Fehlner, Charles A. G. Carter, Kevin D. John, Grace Mann, Richard L. Martin, Thomas M. Cameron, R. Tom Baker, Karyn L. Bishop, Richard D. Broene, Stephen A. Westcott, John J. Eisch, Peter O. Otieno, Katrin Mackenzie, Boguslaw W. Kotowicz, Frieder Jäkle, François P. Gabbaï, Melanie J. Harvey, Peter H. M. Budzelaar, Giovanni Talarico, Hansgeorg Schnöckel, Andreas Schnepf, Mark J. Pender, Kersten M. Forsthoefel, Larry G. Sneddon, Mark R. Mason, R. Mark Matthews, Alisa M. Perkins, Vira V. Ponomarova, P. Blais, J. K. Brask, T. Chivers, C. Fedorchuk, G. Schatte, R. B. King, I. Silaghi-Dumitrescu, A. Kun, S. Anitha, P. Shanmugavelu, Valeswara-Rao Gazula, S. K. Shankar, Rani B. Menon, R. V. Rao, Jagannatha K. S. Rao, Luigi Zecca, C. Y. Wang, S. P. Bi, M. B. Luo, B. D. Conley, U. Dutta, C. Fridh, A. L. Gilliam, B. C. Yearwood, J. P. Selegue, D. A. Atwood, Anna Strunecka, Jiri Patocka, Pamela J. Shapiro, David A. Atwood, Ned J. Hardman, Andrew D. Phillips, Philip P. Power, L. O. Schebaum, P. Jutzi, Thomas P. Fehlner, Charles A. G. Carter, Kevin D. John, Grace Mann, Richard L. Martin, Thomas M. Cameron, R. Tom Baker, Karyn L. Bishop, Richard D. Broene, Stephen A. Westcott, John J. Eisch, Peter O. Otieno, Katrin Mackenzie, Boguslaw W. Kotowicz, Frieder Jäkle, François P. Gabbaï, Melanie J. Harvey, Peter H. M. Budzelaar, Giovanni Talarico, Hansgeorg Schnöckel, Andreas Schnepf, Mark J. Pender, Kersten M. Forsthoefel, Larry G. Sneddon, Mark R. Mason, R. Mark Matthews, Alisa M. Perkins, Vira V. Ponomarova, P. Blais, J. K. Brask, T. Chivers, C. Fedorchuk, G. Schatte, R. B. King, I. Silaghi-Dumitrescu, A. Kun, S. Anitha, P. Shanmugavelu, Valeswara-Rao Gazula, S. K. Shankar, Rani B. Menon, R. V. Rao, Jagannatha K. S. Rao, Luigi Zecca, C. Y. Wang, S. P. Bi, M. B. Luo, B. D. Conley, U. Dutta, C. Fridh, A. L. Gilliam, B. C. Yearwood, J. P. Selegue, D. A. Atwood, Anna Strunecka, and Jiri Patocka

Published
2002

202. Lewis acidity enhancement of organoboranes via oxidation of appended ferrocene moieties.

Author

Krishnan Venkatasubbaiah, Israel Nowik, Rolfe H. Herber, and Frieder Jäkle

Subjects
LEWIS acids, ACID-base chemistry, ORGANIC compounds, FERROCENE
Abstract

The Lewis acidity of boron in diboradiferrocene 1 is strongly enhanced through oxidation of the iron atoms as evident from examination of X-ray structural parameters of the mixed-valent cation 1+PF6 and further confirmed from the strong complexation of MeCN to the dication in 22+(I3)2. [ABSTRACT FROM AUTHOR]

Published
2007

203. Tuning of the emission of organoboron quinolate polymers

Author

Frieder Jäkle and Yang Qin

Subjects
chemistry.chemical_classification, Laser scattering, Photoluminescence, Materials science, chemistry, business.industry, OLED, Optoelectronics, Polymer, business, Luminescence
Abstract

A new class of organoboron quinolate polymers have been prepared and their luminescence properties have been studied.

204. Synthesis, electronic structure, and novel reactivity of strained, boron-bridged [1]ferrocenophanes

Author

and Alan J. Lough, Andrea Berenbaum, Frieder Jäkle, Jennifer C. Green, Regina Dirk, Ian Manners, Holger Braunschweig, and Ulli Englert

Subjects
Chemistry, Stereochemistry, chemistry.chemical_element, General Chemistry, Electronic structure, Mass spectrometry, Biochemistry, Catalysis, Spectral line, Crystallography, Colloid and Surface Chemistry, Cyclopentadienyl complex, Spectroscopy, Boron
Abstract

The first boron-bridged [1]ferrocenophanes, Fe(η-C5H4)2BN(SiMe3)2 (4a), Fe(η-C5H4)2BN(tBu)SiMe3 (4b), and Fe(η-C5H4)2BNiPr2 (4c), have been synthesized via reaction of Fe(η-C5H4Li)2·nTMEDA (TMEDA = N,N,N‘,N‘-tetramethylethylenediamine) with the aminodichloroboranes Cl2BN(SiMe3)2, Cl2BN(tBu)SiMe3, and Cl2BNiPr2, respectively. Species 4a, 4b, and 4c represent the first [1]ferrocenophanes containing a bridging first row element and were isolated in 35−44% yield as dark red crystalline solids which were characterized by multinuclear NMR and UV−vis spectroscopy, mass spectrometry, and single-crystal X-ray diffraction (4a,c). The tilt-angle between the planes of the cyclopentadienyl rings in 4a and 4c was found to be 32.4(2)° and 31.2(2)° (average), respectively. The angle of 32.4(2)° in 4a represents the largest tilt reported to date for any [n]ferrocenophane. The ring-tilting results in a considerable redshift of the lowest energy absorbances in the UV−vis spectra recorded in hexanes (λmax 479 (4a), 489 (4b),...

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