Magnetic measurements on a {Dy4} single-molecule magnet (SMM) with defect-dicubane central core, synthesized using 1,2-bis(2-hydroxy-3-methoxybenzylidene) hydrazone and 3-methoxysalicylaldehyde as chelating agents (see structure; yellow Dy, red O, blue N, green Cl), confirm SMM behavior reveal hysteresis loops at 7 K. The anisotropic energy barrier of Ueff=170 K is the highest reported to date. Detailed facts importance specialist readers are published "Supporting Information". Such...

A family of five dinuclear lanthanide complexes has been synthesized with general formula [LnIII2(valdien)2(NO3)2] where (H2valdien = N1,N3-bis(3-methoxysalicylidene)diethylenetriamine) and LnIII EuIII1, GdIII2, TbIII3, DyIII4, HoIII5. The magnetic investigations reveal that 4 exhibits single-molecule magnet (SMM) behavior an anisotropic barrier Ueff 76 K. step-like features in the hysteresis loops observed for antiferromagnetic exchange coupling between two dysprosium ions. Ab initio...

Single-molecule magnets (SMMs) that contain one spin centre (so-called single-ion magnets) theoretically represent the smallest possible unit for spin-based electronic devices. These molecules hold promise to revolutionize computing and change methodology by which we store, employ process information.

Dysprosium-based single-molecule magnets: Single-molecule magnets (SMMs) of dinuclear dysprosium(III) having thermal and quantum tunneling regimes magnetization relaxation have been synthesized. Remarkably large energy barriers up to 71 K are observed, in particular for the polymeric complex network, which has largest gap a lanthanide one highest reported SMM. Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited...

The reaction of MnCl2·4H2O (3 equiv), pyridine-2,6-dimethanol (pdmH2) (10 and NaN3 equiv) in MeOH/MeCN (1:2 v/v) with NMe4OH (1 gave [Mn25O18(OH)2(N3)12(pdm)6(pdmH)6](Cl)2·12MeCN (1·12MeCN) ∼30% yield. cation complex 1 comprises five Mnx layers three types an ABCBA arrangement. Fitting variable-temperature -field magnetization data establishes that has S = 51/2 ground state, the largest value for a molecular species. also displays hysteresis loops below 0.6 K vs applied field sweeps,...

Abstract Remanence and coercivity are the basic characteristics of permanent magnets. They also tightly correlated with existence long relaxation times magnetization in a number molecular complexes, called accordingly single‐molecule magnets (SMMs). Up to now, hysteresis loops large coercive fields have only been observed polynuclear metal complexes metal‐radical SMMs. On contrary, mononuclear single‐ion (SIM), shown butterfly/phonon bottleneck type, negligible coercivity, therefore much...

Bis(imino)pyridine pincer ligands in conjunction with two isothiocyanate have been used to prepare mononuclear Co(II) complexes. Both complexes a distorted square-pyramidal geometry the centers lying above basal plane. This leads significant spin-orbit coupling for d(7) ions and consequently slow relaxation of magnetization that is characteristic Single-Molecule Magnet (SMM) behavior.

Two different coupling strategies were employed to create ErIII single-molecule magnets (SMMs) using high blocking temperature mononuclear precursors. The magnetic properties of three lanthanide–COT complexes, [ErIII2(COT′′)3] (1) (COT′′ = 1,4-bis(trimethylsilyl)cyclooctatetraenyl dianion) and K2(THF)4[LnIII2(COT)4] (Ln Gd (2), Er (3); THF tetrahydrofuran, COT cyclooctatetraenyl dianion), are reported. Both complexes behave as SMMs exhibit hysteresis at 12 K in solid state. In solution...

The effect of electron-withdrawing ligands on the energy barriers Single-Molecule Magnets (SMMs) is investigated. By introducing highly atoms targeted ligands, barrier was significantly enhanced. structural and magnetic properties five novel SMMs based a dinuclear {Dy2} phenoxo-bridged motif are explored compared with previously studied SMM (1). All complexes share formula [Dy2(valdien)2(L)2]·solvent, where H2valdien = N1,N3-bis(3-methoxysalicylidene) diethylenetriamine, terminal ligand L...

A dysprosium(III) sandwich complex, [Dy(III)(COT″)(2)Li(THF)(DME)], was synthesized using 1,4-bis(trimethylsilyl)cyclooctatetraenyl dianion (COT″). The complex behaves as a single-ion magnet and demonstrates unusual multiple relaxation modes. observed pathways strongly depend on the applied static dc fields.

The two-coordinate cationic Ni(I) bis-N-heterocyclic carbene complex [Ni(6-Mes)2]Br (1) [6-Mes =1,3-bis(2,4,6-trimethylphenyl)-3,4,5,6-tetrahydropyrimidin-2-ylidene] has been structurally characterized and displays a highly linear geometry with C-Ni-C angle of 179.27(13)°. Density functional theory calculations revealed that the five occupied metal-based orbitals are split in an approximate 2:1:2 pattern. Significant magnetic anisotropy results from this orbital degeneracy, leading to...

An organometallic building block strategy was employed to investigate the magnetic properties of a LnIII single-ion magnet (SIM) and subsequent single-molecule (SMM) after coupling two monomeric units. New homoleptic DyIIICOT″2 LnIII2COT″3 (Ln = Gd, Dy) complexes have been synthesized. DFT calculations bimetallic DyIII complex indicate strong metal–ligand covalency uneven donation ions by terminal internal COT″2– (cyclooctatetraenide) rings that correlate with respective bond distances....

DyIII single-ion magnets (SIMs) with strong axial donors and weak equatorial ligands are attractive model systems which to harness the maximum magnetic anisotropy of ions. Utilizing a rigid ferrocene diamide ligand (NNTBS), SIM, (NNTBS)DyI(THF)2, 1-Dy (NNTBS = fc(NHSitBuMe2)2, fc 1,1'-ferrocenediyl), composed near linear arrangement donor atoms, exhibits large energy barrier spin reversal (770.8 K) blocking (14 K). The effects transverse on electronic structure were investigated through ab...

A unique Dy(III)(6) complex is created by linking of two Dy(III)(3) triangles, in which intramolecular ferromagnetic interactions and single-molecule magnetic behaviour have been observed.

Two mononuclear high-spin Fe(II) complexes with trigonal planar ([Fe(II)(N(TMS)(2))(2)(PCy(3))] (1) and distorted tetrahedral ([Fe(II)(N(TMS)(2))(2)(depe)] (2) geometries are reported (TMS = SiMe(3), Cy cyclohexyl, depe 1,2-bis(diethylphosphino)ethane). The magnetic properties of 1 2 reveal the profound effect out-of-state spin-orbit coupling (SOC) on slow relaxation. Complex exhibits relaxation magnetization under an applied optimal dc field 600 Oe due to presence low-lying electronic...

Ammonia-borane (NH(3)BH(3), AB) has garnered interest as a hydrogen storage material due to its high weight percent content and ease of H(2) release relative metal hydrides. As consequence dehydrogenation, B-N-containing oligomeric/polymeric materials are formed. The ability control this process dictate the identity generated polymer opens up possibility targeted synthesis new materials. While precious metals have been used in regard, construct such using earth-abundant Fe presents more...

The electronic and magnetic properties of the complexes [Co(terpy)Cl2] (1), [Co(terpy)(NCS)2] (2), [Co(terpy)2](NCS)2 (3) were investigated. coordination environment around CoII in 1 2 leads to a high-spin complex at low temperature single-molecule magnet with multiple relaxation pathways. Changing ligand field geometry an additional terpy spin-crossover behavior 3 gradual transition from high spin spin.

The reaction of the mixed-valent metal triangles [Mn(3)O(O(2)CR)(6)(py)(3)] (R = CH(3), Ph, C(CH(3))(3)) with tripodal ligands H(3)thme (1,1,1-tris(hydroxymethyl)ethane) and H(3)tmp (1,1,1-tris(hydroxymethyl)propane) in MeCN, produces a family manganese rodlike complexes whose structures are all derived from series edge-sharing triangles. Variable temperature direct current (dc) magnetic susceptibility data were collected for 1.8-300 K range fields up to 7.0 T. Complex 1,...

A Dy2 single-molecule magnet was isolated using a mixed ligand strategy in which the DyIII ions adopt distinct coordination environments. This leads to two unique relaxation modes due single-ion type mechanism. Energy barriers were obtained from individually fitting overlapping peaks.

ConspectusSingle-molecule magnets (SMMs) are highly sought after for their potential application in high-density information storage, spintronics, and quantum computing. SMMs exhibit slow relaxation of the magnetization purely molecular origin, thus making them excellent candidates towards aforementioned applications. In recent years, significant focus has been placed on rare earth elements due to large intrinsic magnetic anisotropy arising from near degeneracy 4f orbitals. Traditionally,...

A mononuclear Er(III) sandwich type complex, [Li(DME)3][Er(III)(COT")2], was isolated using 1,4-bis(trimethylsilyl)cyclooctatetraenyl dianion (COT"). Remarkably, this low-symmetry complex exhibits magnet-like behavior of magnetic remanence and coercivity in the hysteresis loops up to 8 K with an energy barrier (Ueff) 187(1) K, thus making molecule a unique single-ion magnet.

The syntheses, structures, and magnetic properties are reported for four new lanthanide clusters [Sm(4)(μ(3)-OH)(2)L(2)(acac)(6)]·4H(2)O (1), [Gd(4)(μ(3)-OH)(2)L(2)(acac)(6)]·4CH(3)CN (2), [Ln(4)(μ(3)-OH)(2)L(2)(acac)(6)]·2H(2)L·2CH(3)CN (3, Ln = Tb; 4, Dy) supported by salen-type (H(2)L N,N'-bis(salicylidene)-1,2-cyclohexanediamine) β-diketonate (acac acetylacetonate) ligands. were confirmed to be essentially isomorphous infrared spectroscopy single-crystal X-ray diffraction. Their crystal...