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274 results on '"Wilbrandt, R."'

3. Radical cation of N,N-dimethylpiperazine: dramatic structural effects of orbital interactions through bonds

Author

Brouwer, A.M., Zwier, J.M., Svendsen, C., Mortensen, O.S., Langkilde, F.W., and Wilbrandt, R.

Subjects
Piperazine -- Research, Molecular orbitals -- Research, Intermolecular forces -- Research, Chemical bonds -- Research, Cations -- Research, Chemistry
Abstract

The radical cation of N,N-dimethylpiperazine (DMP) was investigated since its molecule exhibited minimal splittings in the single pair ionization energies because of unfavorable geometry for orbital interactions through bonds. The molecule was studied utilizing time-resolved optical absorption and resonance Raman spectroscopy. It was established that an extensive geometry reorganization happened in DMP after ionization due to the negativity of the neutral molecular structure for through-bond interaction.

Published
1998

16. Einzelbesprechungen

Author

Stephans, K. H., Stonier, A. W., Frhr. v. Mering, O., Beckhart, B. H., Kauder, E., Chappey, J., Sokal, M., Nusko, H., Dolinski, N. W., Wilbrandt, R., Ferenczi, I., Ricci, U., de Luca, M., Zassenhaus, H., and Fröhlich, W.

Published
1934
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17. Einzelbesprechungen

Author

Vogelnik, A., Kristensen, T., Knoblich, A., Tinbergen, J., D. S., Wilbrandt, R., Casper, K., Kamitz, R., Winkler, W., Fischer, G., and Hassinger, H.

Published
1938
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18. Einzelbesprechungen

Author

Vito, F., Veit, O., Hoffmann, W., Rössle, K., Fischer, G., Wilbrandt, R., Gröll, F., Vogel, E. H., Lindrath, H., Winkler, W., Mahr, A., Quante, P., and Brinkmann, C.

Published
1939
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20. Einzelbesprechungen

Author

Wilbrandt, R., Veit, O., Madlé, A., Ottel, K., Linhardt, H., Vogel, E. Hugo, Günther, A., and Lorenz, P.

Published
1941
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41. A Molecular Switch Involving Large Conformational Changes. A Theoretical Study

Author

Sommer-Larsen, P., Bjørnholm, Thomas, Jørgensen, M., Lerstrup, Knud, Frederiksen, P., Schaumburg, Kjeld, Brunfeldt, K., Bechgaard, Klaus, Roth, S., Poplawski, J., Byrne, H., Anders, J., Eriksson, L., Wilbrandt, R., Frederiksen, J., Sommer-Larsen, P., Bjørnholm, Thomas, Jørgensen, M., Lerstrup, Knud, Frederiksen, P., Schaumburg, Kjeld, Brunfeldt, K., Bechgaard, Klaus, Roth, S., Poplawski, J., Byrne, H., Anders, J., Eriksson, L., Wilbrandt, R., and Frederiksen, J.

Published
1993

42. Time-resolved resonance Raman study of proton transferring systems in the excited triplet state: 2,2'-bipyridine and 2,2'-bipyridine-3,3'-diol

Author

Langkilde, F.W., Mordzinski, A., Wilbrandt, R., Langkilde, F.W., Mordzinski, A., and Wilbrandt, R.

Abstract

Time-resolved resonance Raman (RR) spectra of the excited triplet state T1 of 2,2'-bipyridine (BP), 2,2'-bipyridine-3,3'-diol BP(OH)2, and 5,5'-dimethyl-2,2'-bipyridine-3,3'-diol Me2BP(OH)2 are obtained. and interpreted by comparison with their ground-state Raman spectra and the T1 spectrum of biphenyl. The BP T1 RR spectrum is assigned assuming C2h molecular symmetry. The T1 RR spectra of BP(OH)2 and Me2BP(OH)2 are ascribed to diketo tautomers that are products of double proton transfer in the S1 state.

Published
1992

43. Resonance Raman study of benzyl radical

Author

Langkilde, F.W., Bajdor, K., Wilbrandt, R., Langkilde, F.W., Bajdor, K., and Wilbrandt, R.

Abstract

Time-resolved resonance Raman spectra are obtained of benzyl radicals created by laser flash photolysis of benzylchloride and diphenylacetone in solution. The spectra are obtained in resonance with the intense 2 2A2-1 B-2(2) transition of benzyl. The strong Raman bands are assigned to totally symmetric a1 modes. The remaining observed bands are tentatively assigned to fundamental modes of b1, a2, and b2 symmetry, and to overtones and combinations. The resonance Raman spectra are found to be quite different from previous fluorescence spectra of benzyl, and the origins of these differences are discussed.

Published
1992

50. Localization Versus Delocalization in Diamine Radical Cations.

Author

Brouwer, A. M., primary, Wiering, P. G., additional, Zwier, J. M., additional, Langkilde, F. W., additional, Wilbrandt, R., additional, Niinistö, Lauri, additional, Styring, Stenbjörn, additional, Tommos, Cecilia, additional, Warncke, Kurt, additional, and Wood, Bryan R., additional

Published
1997
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