Structure, magnetic and luminescence properties of the lanthanide complexes Ln2(Salphen)3·H2O (Ln=Pr, Nd, Sm, Eu, Gd, Tb, Dy; H2Salphen=N,N′-bis(salicylidene)-1,2-phenylenediamine)

Mikhalyova, Elena A.; Yakovenko, A. V.; Zeller, Mat­thias; Gavrilenko, Konstantin S.; Lofland, S. E.; Addison, Anthony W.; Pavlishchuk, V. V.

doi:10.1016/j.ica.2014.01.034

Cited by 31 publications

(13 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The values obtained for these parameters for 3 and 4 agree well with those obtained previously for complexes containing [SmCu 5 (GlyHA) 5 ] 3+ and [EuCu 5 (GlyHA) 5 ] 3+ units . The value of the spin‐orbit‐coupling parameter [ λ = 303(9) cm –1 ] obtained for Eu III in 4 also corresponds well to typical λ values obtained from magnetic and spectroscopic experiments for different Eu III complexes , , ,

χ_{S m} = \frac{N β^{2}}{3 k T x} [\frac{2.143 x + 7.347 + (49.92 x + 1.641) e^{- 7 x / 2} + (283.7 x - 0.6571) e^{- 8 x} + (620.6 x - 1.94) e^{- 27 x / 2} + (1122 x - 2.835) e^{- 20 x} + (1813 x - 3.556) e^{- 55 x / 2}}{3 + 4 e^{- 7 x / 2} + 5 e^{- 3 x} + 7 e^{- 8 x} + 6 e^{- 27 x / 2} + 7 e^{- 20 x} + 8 e^{- 55 x / 2}}], x = \frac{λ}{k T}

χ_{E u} = \frac{N β^{2}}{3 k T x} [24 + (\frac{27}{2} x - \frac{3}{2}) e^{- x} + (\frac{135}{2} x - \frac{5}{2}) e^{- 3 x} + (189 x - \frac{7}{2}) e^{- 6 x} + (405 x - \frac{9}{}

…”

Section: Resultssupporting

confidence: 86%

“…During the fitting procedure for complexes 1 – 3 some of the parameter values were fixed using typical values previously reported in the literature [for 1 : g Pr = 0.89 (theoretical g J for Pr III is 0.80); for 2 : g Cu = 2.0; for 3 : g Sm = 0.29 (theoretical g J for Sm III is 0.29), λ Sm = 220 cm –1 ; Table ] , , , . The values obtained for Δ and g Nd for 1 and 2 (Table ) are in good correspondence with those reported previously using the same interpretative approach , , , , , . However, in many prior cases, the fitting procedures were simplified for Pr III ‐containing complexes by using only equation (5) (the χ ⊥ term was neglected) , .…”

Section: Resultssupporting

confidence: 76%

“…Complex 3 with Sm III ions possesses a χ M T value at room temperature which is noticeably higher than that calculated for five non‐interacting Cu 2+ ions ( S = 1/2, g Cu = 2.0) and one Sm III ion (Table ),, which results from significant population of low‐lying Sm III excited states. With decreasing temperature, χ M T values for 1 – 4 fall (Table ), indicating both the existence of dominant antiferromagnetic exchange interactions between paramagnetic centers and depopulation of m J sublevels of Nd III and Pr III ‐containing complexes, or low‐lying excited states for Eu III and Sm III ions , , …”

Section: Resultsmentioning

confidence: 99%

“…The contributions of Pr III and Nd III ions to the magnetic susceptibility in complexes 1 and 2 were taken into account with a free‐ion approximation because ligand field effects are minor and their excited levels are well separated from the ground state , . Additionally, for the ninefold degenerate 3 H 4 and ten‐fold degenerate 4 I 9/2 ground terms for Pr III and Nd III ions, axial splitting of the m J sublevels by the crystal field (4) was taken into account:

{\overset{H}{true}}_{L n} = Δ J_{z}^{2} + μ_{B} g_{J} \hat{J} H

where Δ is the axial splitting parameter and Ĵ the total angular momentum operator for the corresponding Ln III ion.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Magnetic Properties of Ln^III–Cu^II 15‐Metallacrown‐5 Dimers with Terephthalate (Ln^III = Pr, Nd, Sm, Eu)

et al. 2018

Self Cite

View full text Add to dashboard Cite

Metathesis of the isomorphous 15-metallacrown-5 complexes {[LnCu 5 (GlyHA) 5 (SO 4 )(H 2 O) 6.5 ]} 2 (SO 4 )·6H 2 O (Ln III = Pr, Nd, Sm, Eu; GlyHA 2-= glycinehydroxamate) with excess p-bdc 2-(p-bdc 2-= terephthalate) gave pairs of isomorphous complexes {[LnCu 5 (GlyHA) 5 (CO 3 )(H 2 O) 4 ] 2 (p-bdc)}·15H 2 O [Ln = Pr (1) and Nd (2)] and {[LnCu 5 (GlyHA) 5 (SO 4 )(H 2 (4), x = 4, y = 14] as outcomes of partial sulfate replacement. Complexes 1-4 are discrete dimers with two 15metallacrown-5 blocks {LnCu 5 } 3+ , a bridging p-bdc 2and a bidentate capping anion on each Ln 3+ . The anion caps in 1 and 2 are carbonates from atmospheric CO 2 capture, while in 3 and 4 the anion caps are sulfates. Between 3 K and 300 K, intramet- [a] 3504 allacycle antiferromagnetic exchange interactions amongst the Cu 2+ dominate the magnetic properties of 1-4, while for the Ln 3+ , spin-orbit coupling and crystal field effects are significant, the former being greater for Sm 3+ and Eu 3+ . The experimental M T vs. T data were fitted with an additive model reflecting the dominance of the Cu···Cu superexchange, while Ln 3+ ···Cu 2+ exchange interactions were taken into account through a molecular field approach. The best-fit values (-2J Cu-Cu ) for the intercopper superexchange interactions range from 88 to 120 cm -1 ; the g-factors, spin-orbit coupling (λ) and axial crystal field splitting (Δ) parameter values are typical for Ln III .

show abstract

χ_{S m} = \frac{N β^{2}}{3 k T x} [\frac{2.143 x + 7.347 + (49.92 x + 1.641) e^{- 7 x / 2} + (283.7 x - 0.6571) e^{- 8 x} + (620.6 x - 1.94) e^{- 27 x / 2} + (1122 x - 2.835) e^{- 20 x} + (1813 x - 3.556) e^{- 55 x / 2}}{3 + 4 e^{- 7 x / 2} + 5 e^{- 3 x} + 7 e^{- 8 x} + 6 e^{- 27 x / 2} + 7 e^{- 20 x} + 8 e^{- 55 x / 2}}], x = \frac{λ}{k T}

χ_{E u} = \frac{N β^{2}}{3 k T x} [24 + (\frac{27}{2} x - \frac{3}{2}) e^{- x} + (\frac{135}{2} x - \frac{5}{2}) e^{- 3 x} + (189 x - \frac{7}{2}) e^{- 6 x} + (405 x - \frac{9}{}

…”

Section: Resultssupporting

confidence: 86%

Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

{\overset{H}{true}}_{L n} = Δ J_{z}^{2} + μ_{B} g_{J} \hat{J} H

where Δ is the axial splitting parameter and Ĵ the total angular momentum operator for the corresponding Ln III ion.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Properties of Ln^III–Cu^II 15‐Metallacrown‐5 Dimers with Terephthalate (Ln^III = Pr, Nd, Sm, Eu)

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Tetradentate NNOO Schiff-bases have been used extensively as supporting ligands in d-block chemistry because of their ability to stabilize metals in various oxidation states (Alaghaz et al, 2014;Kianfar et al, 2015;Mikhalyova et al, 2014;Borthakur et al, 2014;Basumatary et al, 2015). For many years, particular attention has been devoted to imines because of their uses as catalysts in various organic transformations (Khorshidifard et al, 2015), and for their anticancer (Shiju et al, 2015), antifungal (Abo-Aly et al, 2015) and antibacterial (Salehi et al, 2015) properties.…”

Section: Chemical Contextmentioning

confidence: 99%

Crystal structure of 1,1′-{(pentane-1,5-diyl)bis[(azaniumylylidene)methanylylidene]}bis(naphthalen-2-olate)

Ouari¹,

Merzougui²,

Karmazin³

2015

Acta Cryst E

View full text Add to dashboard Cite

show abstract

Linear Tetranuclear Lanthanide Cymantrenecarboxylates with Diethylene Glycol Ligand: Synthesis, Magnetism, and Thermolysis

et al. 2020

View full text Add to dashboard Cite

Exchange reactions of LnCl3 and CymCO2K in aqueous‐organic medium in the presence of diethylene glycol (DEG) bring about isostructural tetranuclear cluster complexes with linear core, [Ln4(CymCO2)12(O(CH2CH2OH)2)2(H2O)4] ⋅ 2THF (Ln=Nd (1), Gd (2), Tb (3), Dy (4), Ho (5); Cym=(η5‐C5H4)Mn(CO)3). The complexes have centrosymmetric structure and contain two types of Ln3+ coordination centers. Thermal decomposition of the complexes under argon and air atmospheres was studied; in the latter case it brings about mixed oxides LnMn2O5 as one of the products. The complexes 1–5 were characterized by dc‐ and ac‐magnetic measurements. Complexes of Nd, Gd, and Dy exhibit the properties of single‐molecule magnets (SMMs) with remagnetization barriers Δeff/kB of 14 K for 1 under 2500 Oe dc‐field, 13 K for 2 under 1500 Oe dc‐field, and with two barriers, 18 and 19 K, for 4 in zero field. The presence of field‐induced slow relaxation of the magnetization detected for the complex 2 is a rare case for Gd complexes.

show abstract

Structure, magnetic and luminescence properties of the lanthanide complexes Ln2(Salphen)3·H2O (Ln=Pr, Nd, Sm, Eu, Gd, Tb, Dy; H2Salphen=N,N′-bis(salicylidene)-1,2-phenylenediamine)

Cited by 31 publications

References 68 publications

Magnetic Properties of Ln^III–Cu^II 15‐Metallacrown‐5 Dimers with Terephthalate (Ln^III = Pr, Nd, Sm, Eu)

Magnetic Properties of Ln^III–Cu^II 15‐Metallacrown‐5 Dimers with Terephthalate (Ln^III = Pr, Nd, Sm, Eu)

Crystal structure of 1,1′-{(pentane-1,5-diyl)bis[(azaniumylylidene)methanylylidene]}bis(naphthalen-2-olate)

Linear Tetranuclear Lanthanide Cymantrenecarboxylates with Diethylene Glycol Ligand: Synthesis, Magnetism, and Thermolysis

Contact Info

Product

Resources

About

Structure, magnetic and luminescence properties of the lanthanide complexes Ln2(Salphen)3·H2O (Ln=Pr, Nd, Sm, Eu, Gd, Tb, Dy; H2Salphen=N,N′-bis(salicylidene)-1,2-phenylenediamine)

Cited by 31 publications

References 68 publications

Magnetic Properties of LnIII–CuII 15‐Metallacrown‐5 Dimers with Terephthalate (LnIII = Pr, Nd, Sm, Eu)

Magnetic Properties of LnIII–CuII 15‐Metallacrown‐5 Dimers with Terephthalate (LnIII = Pr, Nd, Sm, Eu)

Crystal structure of 1,1′-{(pentane-1,5-diyl)bis[(azaniumylylidene)methanylylidene]}bis(naphthalen-2-olate)

Linear Tetranuclear Lanthanide Cymantrenecarboxylates with Diethylene Glycol Ligand: Synthesis, Magnetism, and Thermolysis

Contact Info

Product

Resources

About

Magnetic Properties of Ln^III–Cu^II 15‐Metallacrown‐5 Dimers with Terephthalate (Ln^III = Pr, Nd, Sm, Eu)

Magnetic Properties of Ln^III–Cu^II 15‐Metallacrown‐5 Dimers with Terephthalate (Ln^III = Pr, Nd, Sm, Eu)