Topic
Relaxation (NMR)
About: Relaxation (NMR) is a research topic. Over the lifetime, 29342 publications have been published within this topic receiving 689851 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: Two planar tetranuclear dysprosium(III) complexes, which exhibit an anion-dependent magnetic slow relaxation behavior, have been synthesized by in situ condensation of o-vanillin and 2-aminoethanol.
Abstract: Two planar tetranuclear dysprosium(III) complexes, [Dy4(μ3-OH)2(hmmpH)2(hmmp)2(Cl)4]·3MeCN·MeOH (1) and [Dy4(μ3-OH)2(hmmpH)2(hmmp)2(N3)4]·4MeOH (2) {hmmpH2 = 2-[(2-hydroxyethylimino)methyl]-6-methoxyphenol}, which exhibit an anion-dependent magnetic slow relaxation behavior, have been synthesized by in situ condensation of o-vanillin and 2-aminoethanol. The higher energy barrier observed in 2 could be the result of a more favorable crystal field and/or orientations of single-ion easy axes of magnetization of the DyIII ions.
234 citations
TL;DR: In this paper, the triplet state of a single pentacene molecule embedded in a p-terphenyl host crystal was observed for a single molecule in a single-molecule environment.
Abstract: THE introduction of optical detection methods for observing magnetic resonance transitions in metastable paramagnetic states1–4 has contributed enormously to our understanding of the properties of photoexcited molecules in condensed phases. In such experiments the luminescence intensity is recorded as a function of the frequency of an applied microwave field. At resonance with transitions between sublevels of a metastable paramagnetic state, the lifetime of the metastable state is altered and a consequent change in the luminescence intensity is observed. Here we report the observation of such optically detected magnetic resonance transitions for the triplet state of a single pentacene molecule embedded in a p-terphenyl host crystal. This result has been obtained by combining the conventional optical detection technique for observing magnetic resonance transitions1–4 with the new single-molecule optical detection methods developed recently5,6. This observation opens the way for magnetic resonance studies in condensed phases with single-molecule sensitivity.
233 citations
TL;DR: In this paper, the properties of ten spectral densities relevant for nuclear spin relaxation studies in solids are investigated and a brief review of the appropriate spin-dependent interactions and the various relaxation rates which can be measured is discussed.
233 citations
TL;DR: In this paper, the dielectric constants of water and heavy water were determined from 270 to 362 K and decomposed into four components: slow relaxation, fast relaxation, intermolecular stretching vibration, and intermolescular libration.
233 citations
TL;DR: The femtosecond-resolved evolution of the emission spectrum of the important conjugated polymer poly(3-hexylthiophene) (P3HT) is presented in this article.
Abstract: The femtosecond-resolved evolution of the emission spectrum of the important conjugated polymer poly(3-hexylthiophene) (P3HT) is presented. Detailed fluorescence up-conversion spectroscopy was performed on P3HT solid-state films and on P3HT in chlorobenzene solution. Two excitation wavelengths and several emission wavelengths, covering the entire fluorescence spectrum, were used. The data were complemented by polarization-sensitive measurements. Our global analysis allowed a reconstruction of the time-resolved emission spectra with 200 fs temporal resolution, so that spectral changes due to the early relaxation processes following π–π* interband absorption in the pristine polymer could be comprehensively characterized. Absorption occurs in isolated polymer chains in solution and in the solid state (including interchain interactions) for the film. In both cases, we find evidence of delocalization of the electrons and holes formed in the energy bands directly after photoexcitation with excess energy. This i...
231 citations