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Sharples JW, Collison D, McInnes EJL, Schnack J, Palacios E, Evangelisti M. Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements. Nat Commun 2014; 5:5321. [PMID: 25336061 PMCID: PMC4220460 DOI: 10.1038/ncomms6321] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 09/19/2014] [Indexed: 11/09/2022] Open
Abstract
Geometric spin frustration in low-dimensional materials, such as the two-dimensional kagome or triangular antiferromagnetic nets, can significantly enhance the change of the magnetic entropy and adiabatic temperature following a change in the applied magnetic field, that is, the magnetocaloric effect. In principle, an equivalent outcome should also be observable in certain high-symmetry zero-dimensional, that is, molecular, structures with frustrated topologies. Here we report experimental realization of this in a heptametallic gadolinium molecule. Adiabatic demagnetization experiments reach ~200 mK, the first sub-Kelvin cooling with any molecular nanomagnet, and reveal isentropes (the constant entropy paths followed in the temperature-field plane) with a rich structure. The latter is shown to be a direct manifestation of the trigonal antiferromagnetic net structure, allowing study of frustration-enhanced magnetocaloric effects in a finite system. The magnetocaloric effect is well understood in spin-frustrated low-dimensional systems, and should be observable in certain high-symmetry molecular structures. Here, the authors report the experimental observation of sub-Kelvin cooling with a molecular magnet, and probe the low-temperature spin behaviour.
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Martin LR, May I, Collison D, Helliwell M, Hastings JJ, Denniss IS. Phosphate and Phosphate Analogue Complexes of Uranyl Nitrate. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2002.10875505] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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53
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Zhang YJ, Tilley GJ, Martin LR, Collison D, Livens FR, Helliwell M, Malik KA, Hursthouse MB. Controlling Solid State Structure of Uranyl(VI) Complexes: Monomeric Complexes with Malonate and Malonamate. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2002.10875506] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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54
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Renshaw JC, Livens FR, Collison D, Robson GD, Trinci APJ, Taylor RJ. Solubilization of α-FeO(OH), ThO2.2H2O and γ-UO3 by hydroxamate and carboxylate Hgands. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2002.10875455] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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55
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John GH, Collison D, May I, Livens FR, Helliwell M, McKinney JD. Investigation of the UO22+ / ReO4 / TPPO reaction system; the first characterised actinide-perrhenate complex, [UO2(ReO4)2(TPPO)3]. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2002.10875504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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56
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Thorpe JM, Beddoes RL, Collison D, Garner CD, Helliwell M, Holmes JM, Tasker PA. Surface coordination chemistry: corrosion inhibition by tetranuclear cluster formation of iron with salicylaldoxime. Angew Chem Int Ed Engl 2014; 38:1119-21. [PMID: 25138515 DOI: 10.1002/(sici)1521-3773(19990419)38:8<1119::aid-anie1119>3.0.co;2-4] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/1998] [Indexed: 11/09/2022]
Abstract
A tetranuclear iron cluster is the principal component of the purple coatings produced by treating a mild steel surface with a salicylaldoxime corrosion inhibitor. This was shown by comparison of the spectroscopic data with those of the cluster [{Fe(salH)(HsalH)}4 ], which was obtained from FeCl3 and salicylaldoxime (H2 salH) and has a distorted tetrahedral arrangement of Fe(III) atoms coordinated by terminal (1-) and bridging (2-) salicylaldoximate ligands (the central core of the cluster is depicted).
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Collison D. The selected papers of William N. Lipscomb, Jr. A legacy in structure–function relationships. CRYSTALLOGR REV 2014. [DOI: 10.1080/0889311x.2014.939961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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58
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Walsh JPS, Sproules S, Chilton NF, Barra AL, Timco GA, Collison D, McInnes EJL, Winpenny REP. On the Possibility of Magneto-Structural Correlations: Detailed Studies of Dinickel Carboxylate Complexes. Inorg Chem 2014; 53:8464-72. [DOI: 10.1021/ic501036h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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59
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Garlatti E, Albring MA, Baker ML, Docherty RJ, Mutka H, Guidi T, Garcia Sakai V, Whitehead GFS, Pritchard RG, Timco GA, Tuna F, Amoretti G, Carretta S, Santini P, Lorusso G, Affronte M, McInnes EJL, Collison D, Winpenny REP. A Detailed Study of the Magnetism of Chiral {Cr7M} Rings: An Investigation into Parametrization and Transferability of Parameters. J Am Chem Soc 2014; 136:9763-72. [DOI: 10.1021/ja5047445] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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60
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Magee SA, Sproules S, Barra AL, Timco GA, Chilton NF, Collison D, Winpenny REP, McInnes EJL. Rücktitelbild: Large Zero-Field Splittings of the Ground Spin State Arising from Antisymmetric Exchange Effects in Heterometallic Triangles (Angew. Chem. 21/2014). Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201401141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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61
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Magee SA, Sproules S, Barra AL, Timco GA, Chilton NF, Collison D, Winpenny REP, McInnes EJL. Back Cover: Large Zero-Field Splittings of the Ground Spin State Arising from Antisymmetric Exchange Effects in Heterometallic Triangles (Angew. Chem. Int. Ed. 21/2014). Angew Chem Int Ed Engl 2014. [DOI: 10.1002/anie.201401141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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62
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Magee SA, Sproules S, Barra AL, Timco GA, Chilton NF, Collison D, Winpenny REP, McInnes EJL. Large zero-field splittings of the ground spin state arising from antisymmetric exchange effects in heterometallic triangles. Angew Chem Int Ed Engl 2014; 53:5310-3. [PMID: 24737709 DOI: 10.1002/anie.201400655] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Indexed: 11/08/2022]
Abstract
[Ru2Mn(O)(O2CtBu)6(py)3] has an S=5/2 ground state with a very large zero-field splitting (ZFS) of D=2.9 cm(-1), as characterized by EPR spectroscopy at 4-330 GHz. This is far too large to be due to the Mn(II) ion (D <0.2 cm(-1)), as shown from the {Fe2Mn} analogue, but can be modeled by antisymmetric exchange effects.
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63
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Magee SA, Sproules S, Barra AL, Timco GA, Chilton NF, Collison D, Winpenny REP, McInnes EJL. Large Zero-Field Splittings of the Ground Spin State Arising from Antisymmetric Exchange Effects in Heterometallic Triangles. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400655] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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64
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Sharples JW, Collison D. The coordination chemistry and magnetism of some 3d-4f and 4f amino-polyalcohol compounds. Coord Chem Rev 2014; 260:1-20. [PMID: 25009361 PMCID: PMC4073056 DOI: 10.1016/j.ccr.2013.09.011] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 09/16/2013] [Indexed: 11/18/2022]
Abstract
Triethanolamine, teaH3, and diethanolamine, RdeaH2, 3d-4f and 4f compounds demonstrate an enormous variety in their structure and bonding. This review examines the synthetic strategies to these molecules and their magnetic properties, whilst trying to assess these ligands' suitability towards new SMMs and magnetic refrigerants.
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Key Words
- 3d–4f
- 4-Me-py, 4-methyl-pyridine
- BVS, bond valence sum
- CASPT2, complete active space perturbation theory 2
- CASSCF, complete active space self consistent field
- Coordination chemistry
- D, axial anisotropy
- Diethanolamine
- E, rhombic ZFS
- H, applied magnetic field
- H2Pc, phthalocyanine
- HDVV, Heisenberg Dirac van Vleck
- HO2CPh, benzoic acid
- HO2CtBu, pivalic acid
- Hbta, benzotriazole
- J12, coupling constant
- JT, Jahn–Teller
- Lanthanide
- MCE, magnetocaloric effect
- Magnetism
- Micro-SQUID, micro-superconducting quantum interference device
- NMR, nuclear magnetic resonance
- QT, quantum tunnelling
- RASSI, restricted active space state interaction
- RdeaH2, functionalised diethanolamines
- SMM, single-molecule magnet
- THF, tetrahydrofuran
- Triethanolamine
- Ueff, anisotropy barrier
- ZFS, zero-field splitting
- a.c., alternating current
- acacH, acetylacetone
- bmhH2, 1,2-bis(2-hydroxy-3-methoxybenzylidene)hydrazone
- chpH, 6-chloro-2-hydroxy-pyridine
- d.c., direct current
- edteH4, N,N,N′,N′-tetrakis(2-hydroxyethyl)ethylenediamine
- fcdcH2, ferrocene dicarboxylic acid
- g, Landé g-value
- iPrO, isopropoxide
- ib, isobutyrate
- kB, Boltzmann constant
- mdeaH2, methyldiethanolamine
- ms, microstate
- mshH, 3-methoxysalicylaldehyde hydrazone
- nBudeaH2, n-butyldiethanolamine
- nBudeaH3, n-butyldiethanolamine
- py, pyridine
- sabheaH3, N-salicylidene-2-(bis(2-hydroxyethyl)amino)ethylamine
- tacn, 1,4,7-triazacyclononane
- teaH3, triethanolamine
- tpaH, triphenyl acetic acid
- Ŝn, spin operator
- ΔTAD, adiabatic temperature change
- μβ, electronic Bohr magneton
- τ, tau
- χ, susceptibility
- χT, susceptibility temperature product
- χ″, out-of-phase susceptibility
- −ΔSM, magnetic entropy change
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65
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Moro F, Kaminski D, Tuna F, Whitehead GFS, Timco GA, Collison D, Winpenny REP, Ardavan A, McInnes EJL. Coherent electron spin manipulation in a dilute oriented ensemble of molecular nanomagnets: pulsed EPR on doped single crystals. Chem Commun (Camb) 2014; 50:91-3. [DOI: 10.1039/c3cc46326e] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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66
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Nguyen T, Håkansson P, Edge R, Collison D, Goodman BA, Burns JR, Stulz E. EPR based distance measurement in Cu-porphyrin–DNA. NEW J CHEM 2014. [DOI: 10.1039/c4nj00673a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Measurement of EPR spectra of Cu-porphyrin–DNA reveals intermolecular interactions between the DNA strands with average distances of 6.5–8.9 Å.
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67
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Zhang Y, Bhadbhade M, Price JR, Karatchevtseva I, Collison D, Lumpkin GR. Kinetics vs. thermodynamics: a unique crystal transformation from a uranyl peroxo-nanocluster to a nanoclustered uranyl polyborate. RSC Adv 2014. [DOI: 10.1039/c4ra06970f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Kinetics vs. thermodynamics: a novel method has been developed to make a nano-clustered uranyl polyborate in aqueous solution at room temperature through a unique crystal transformation.
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68
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69
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Alturaifi HA, Faulkner J, Raftery J, Tuna F, Collison D, Whiteley MW. Synthesis and redox chemistry of cycloheptatrienyl molybdenum carbon-chain complexes featuring diimine support ligands: [Mo{(CC)nCCR}(R′NCH–CHNR′)(η-C7H7)], (n = 0 or 1). J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.07.073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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70
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Bartlett TR, Ahmed S, Tuna F, Collison D, Blanchard GJ, Marken F. Liquid|Liquid Interfacial Photoelectrochemistry of Chromoionophore I Immobilised in 4-(3-Phenylpropyl)Pyridine Microdroplets. ChemElectroChem 2013. [DOI: 10.1002/celc.201300090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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71
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Lorusso G, Sharples JW, Palacios E, Roubeau O, Brechin EK, Sessoli R, Rossin A, Tuna F, McInnes EJL, Collison D, Evangelisti M. A dense metal-organic framework for enhanced magnetic refrigeration. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:4653-4656. [PMID: 23813875 DOI: 10.1002/adma.201301997] [Citation(s) in RCA: 182] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Indexed: 05/28/2023]
Abstract
The three-dimensional metal-organic framework Gd(HCOO)3 is characterized by a relatively compact crystal lattice of weakly interacting Gd(3+) spin centers interconnected via lightweight formate ligands, overall providing a remarkably large magnetic:non-magnetic elemental weight ratio. The resulting magnetocaloric effect per unit volume is decidedly superior in Gd(HCOO)3 than in the best known magnetic refrigerant materials for liquid-helium temperatures and low-moderate applied fields.
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72
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Collison D. Problems in structural inorganic chemistry. CRYSTALLOGR REV 2013. [DOI: 10.1080/0889311x.2013.812082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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73
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Shuvaev KV, Sproules S, Rautiainen JM, McInnes EJL, Collison D, Anson CE, Powell AK. A self-assembled Cu(ii)4[2 × 2] grid with organic radicals. Dalton Trans 2013; 42:2371-81. [DOI: 10.1039/c2dt31946b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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74
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Smith CA, Tuna F, Bodensteiner M, Helliwell M, Collison D, Layfield RA. Exchange-coupled oxygen- and sulfur-bridged cyclopentadienyl-manganese(ii) cages. Dalton Trans 2013; 42:71-4. [DOI: 10.1039/c2dt32262e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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75
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Helten H, Dutta B, Vance JR, Sloan ME, Haddow MF, Sproules S, Collison D, Whittell GR, Lloyd-Jones GC, Manners I. Paramagnetic Titanium(III) and Zirconium(III) Metallocene Complexes as Precatalysts for the Dehydrocoupling/Dehydrogenation of Amine-Boranes. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207903] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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