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Updated: Apr 30, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

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根据皮里丁基复合物中Ln3+的局部环境的定制:对热力学,动力学,结构和放松性质的影响

Martina Sanadar1, Loëza Collobert1, Harlei Martin1

  • 1Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, 45071 Orléans, France. celia.bonnet@cnrs.fr.

Dalton transactions (Cambridge, England : 2003)
|March 7, 2025
PubMed
概括

在配体中用皮里丁或伊米达替换碳酸盐基,会影响兰坦化复合物的稳定性和水交换. 含有伊米达的加多复合物显示出高放松性和加速的水交换,这对于MRI对比剂至关重要.

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals07:24

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Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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