Year-end Sale % OFF 
Abstract
Two isostructural lanthanide amino-phosphonate complexes [Ln10(μ3-OH)3(µ-OH)(CO3)2(O2CtBu)15(O3PC6H10NH2)3(O3PC6H10NH3)2(H2O)2][Et2NH2] (Ln = Gd(III), 1 and Tb(III), 2) have been obtained through reflux reactions of lanthanide pivalates with, a functionalized phosphonate, (1-amino-1-cyclohexyl)phosphonic acid and diethylamine (Et2NH) in acetonitrile (MeCN) at 90 °C. Both compounds have been characterized with elemental analysis, single-crystal X-ray diffraction methods, and magnetic measurements. The molecular structure of compounds 1 and 2 reveal two highly unsymmetrical complexes comprising ten lanthanide metal centers, where the lanthanide metal ion centers in the cages are linked through pivalate units and further interconnected by CPO3 tetrahedra to build the crystal structure. The magnetic behavior of 1 and 2 was investigated between ambient temperature and ca. 2 K, the magnetic measurements for compound 1 suggests antiferromagnetic interactions between the Gd(III) metal ion centers at low temperatures. The large number of isotropic Gd(III) ions comprising 1 makes it a candidate for magnetocaloric applications, thus the magnetocaloric properties of this molecular cage were investigated indirectly through isothermal magnetisation curves. The magnetic entropy change was found to be 34.5 J kg−1K−1, making 1 a plausible candidate in magnetic cooling applications.
Highlights
In recent years, research involving metal phosphonates has been deeply explored because of the great variety of building blocks available for the preparation of functional materials useful in the field of structural chemistry and magnetic properties [1,2,3,4,5,6,7]
When the isotropic Gd(III) metal ion is present, lanthanide phosphonate clusters display impressive magnetocaloric effects (MCE), which have been suggested for application in magnetic refrigeration [13]
Magnetic measurements were performed in temperature ranges of 2–300 K, using a Quantum Design MPMS-XL7 SQUID magnetometer equipped with a 7 T magnet
Summary
Research involving metal phosphonates has been deeply explored because of the great variety of building blocks available for the preparation of functional materials useful in the field of structural chemistry and magnetic properties [1,2,3,4,5,6,7]. Phosphonic acid and its derivatives are flexible coordination ligands towards a wide range of metal ions, with various ionic radii, including Ln(III) ions, resulting in some materials with promising magnetic properties [8,9,10,11]. When the isotropic Gd(III) metal ion is present, lanthanide phosphonate clusters display impressive magnetocaloric effects (MCE), which have been suggested for application in magnetic refrigeration [13]. Hereiaismnsuintphopepohusoessdeplyhooafngaiconoadacimdligilniagnoadpnhdtootssopysnhytonhntehisceizseaizc4eifdtmwlooigle4acfn-updlharotoscpagshyeosnn(taFhtieegscuilzrueest2et)wr[s3oi8s,34p9fr-]o.pvHhidoeersedpi.nhTothhneeartueesaeccotluifosantnsers is provhidaveed.beTehnepererfaocrtmioends bhyarveeflubxeinegn apmerifxotrumreedof blaynthreafnliudxeinpgivaalatme i[xLtnu2r(eO2oCftBluan)6t(hHaOn2idCetBup)i6v]alate [Ln2((OLn2C=tBGud)(6I(IHI);OT2bC(ItBIIu))),6(]1-a(mLinno-1=-cyGcldoh(IeIxI)y;l) pThbo(sIpIIh)o),nic(1ac-aidm(iHn2oO-13-PcCy6cHlo1h0NexHy2l)), anpdhoasmpihldonbiacse, acid (H2OE3tP2CN6HHi1n0NMHeC2)N, ainndthaemmioldle braatsieo,sE0.t12N:0.H5:0i.n01M. eCN in the mole ratios 0.1:0.5:0.01
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
