Dinuclear and Trinuclear Phosphinate Paddlewheels of Lanthanide: Structural and Magnetic Investigations
Junaid Ali1, Calvin Samuel1, Kammala Gangajala1
1University of Hyderabad, Hyderabad, Telangana 500 046, India.
Abstract:
The reaction of hydrated salts of paramagnetic lanthanides (GdCl3, DyCl3, and HoCl3) with sterically hindered phosphinic acid (trityl-H-phosphinic acid) in a stoichiometric ratio of 1:2 afforded dinuclear gadolinium {Gd2[Ph3C-(H)-(PO2)]4(CH3OH)8}-(CH3OH)8Cl2 (1), isostructural paddlewheel-type trinuclear dysprosium {Dy3[(Ph3C)-(H)-(PO2)]8(H2O)6} (2), and holmium {Ho3[(Ph3C)-(H)-(PO2)]8(DMF)4(H2O)2} (3) complexes. The direct current (dc) magnetic measurements indicate potentially very weak magnetic interactions at low temperatures for all complexes (1-3). Alternating current (ac) magnetic susceptibility measurements show field-induced out-of-phase magnetic susceptibility signals for the isotropic GdIII complex (1). Slow magnetic relaxation in this case is attributed to either a direct process or a phonon bottleneck effect. The DyIII complex (2) also exhibits the single-molecule magnet behavior under an applied magnetic field of 2200 Oe, with slow magnetic relaxation occurring through a combination of Raman and Orbach processes, while the small n exponent value also suggests the participation of the phonon bottleneck effect. Additionally, detailed theoretical studies are provided to explain and understand the observed magnetic properties of these complexes.
More Related Videos
07:24Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
13:21Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
Related Concept Videos
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
Valence Bond Theory
Other Nuclides: 31P, 19F, 15N NMR
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
¹H NMR: Pople Notation
A proton...
Atomic Nuclei: Nuclear Spin State Overview
Photoluminescence: Applications
