NDLI: Synthesis, structure and magnetic properties of $Nd^{3+}$ and $Pr^{3+}$ 2D polymers with tetrafluoro-p-phthalate

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mikhalyova, Elena A. Kolotilov, Sergey V. Zeller, Matthias Pavlishchuk, Vitaly V. Hunter, Allen D. Addison, Anthony W. Thompson, Laurence K.
Description	Author Affiliation: Mikhalyova EA ( L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of the Ukraine, Prospekt Nauki 31, Kiev, 03028, Ukraine.)
Abstract	Two lanthanide tetrafluoro-p-phthalate $(L^{2−})$ complexes, $Ln(L)_{1.5}·DMF·H_{2}O$ (Ln = $Pr^{3+}$ (1), $Nd^{3+}$ (2)), were synthesized using pyridine as a base. The compounds were found to be isostructural, and the structure of 1 has been determined by single crystal X-ray diffraction (monoclinic, space group C2, a = 22.194(2) Å, b = 11.4347(12) Å, c = 11.7160(12) Å, β = 94.703(2)°, V = 2963.3(5) $Å^{3},$ Z = 4). The crystal structure of 1 consists of dinuclear $Pr^{3+}$ units, which are connected by tetrafluoro-p-phthalate, forming separate 2D polymeric layers. The $Ln^{3+}$ ions in the dinuclear $Ln_{2}$ units are linked by two μ-O atoms and by two bridging O-C-O groups. The structure is porous with DMF and water molecules located between layers. Non-coordinated DMF molecules occupy about 27% of the unit cell volume. A systematic analysis of reported structures of Ln(III) polymers with p-phthalate and its derivatives shows that the ca. known 60 structures can be divided into six possible structural types depending on the presence of certain structural motifs. The magnetic properties of compounds 1 and 2 were studied. The dependence of $χ_{M}T$ on T (where $χ_{M}$ is magnetic susceptibility per dinuclear lanthanide unit) for 1 and 2 was simulated using two different models, based on: (i) the Hamiltonian Ĥ = $ΔĴ_{z}^{2}+$ $μ_{B}g_{J}HĴ,$ which utilises an axial splitting parameter Δ and temperature-independent paramagnetism (tip) and (ii) crystal field splitting. It was found that both models gave satisfactory fits, indicating that the Ln–Ln exchange interactions are small and the symmetry of the coordination environment is the main factor influencing the magnetic properties of these compounds.
ISSN	14779226
Issue Number	41
Journal	Dalton Trans.
Volume Number	40
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-11-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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