Synthesis, Structure, and Magnetic Properties of the Single-Molecule Magnet [Ni21(cit)12(OH)10(H2O)10]16-
- 31 August 2002
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 41 (20) , 5133-5140
Abstract
The preparation of two new compounds containing the cluster [Ni21(cit)12(OH)10(H2O)10]16- is presented, together with a detailed magnetic investigation of one of the compounds. We found that this cluster shows an unexpected stability and that it exists as different stereoisomers. Compound 1 contains the achiral cluster with a Δ−Λ configuration, and compound 2 contains a pair of enantiomeric clusters with the configurations Δ−Δ and Λ−Λ, respectively. Magnetic measurements of 1 in the millikelvin range were necessary to determine the spin ground state of S = 3, and they also revealed a magnetic anisotropy within the ground state. A frequency-dependent out-of-phase signal was found in alternating current susceptibility measurements at very low temperatures, which indicates a slow relaxation of the magnetization. Thus, individual molecules are acting as single magnetic units, which is a rare phenomenon for nickel clusters. The energy barrier exhibited by compound 1 has been calculated to be 2.9 K.Keywords
This publication has 34 references indexed in Scilit:
- Single-Molecule Magnets: Preparation and Properties of Mixed-Carboxylate Complexes [Mn12O12(O2CR)8(O2CR‘)8(H2O)4]Inorganic Chemistry, 2001
- Single-Molecule Magnets: Site-Specific Ligand Abstraction from [Mn12O12(O2CR)16(H2O)4] and the Preparation and Properties of [Mn12O12(NO3)4(O2CCH2But)12(H2O)4]Inorganic Chemistry, 2001
- A new class of single-molecule magnets: mixed-valent [Mn12O8Cl4(O2CPh)8(hmp)6]Chemical Communications, 2001
- Inelastic Neutron Scattering and Magnetic Susceptibilities of the Single-Molecule Magnets [Mn4O3X(OAc)3(dbm)3] (X = Br, Cl, OAc, and F): Variation of the Anisotropy along the SeriesJournal of the American Chemical Society, 2000
- A third isolated oxidation state for the Mn12 family of single-molecule magnetsChemical Communications, 2000
- Single-Molecule Magnets: A New Class of Tetranuclear Manganese MagnetsInorganic Chemistry, 2000
- Reduced Anionic Mn12Molecules with Half-Integer Ground States as Single-Molecule MagnetsInorganic Chemistry, 1999
- Modeling the Photosynthetic Water Oxidation Center: Chloride/Bromide Incorporation and Reversible Redox Processes in the Complexes Mn4O3X(OAc)3(dbm)3 (X = Cl, Br) and (pyH)3[Mn4O3Cl7(OAc)3]Inorganic Chemistry, 1996
- Magnetic bistability in a metal-ion clusterNature, 1993
- High-spin molecules: [Mn12O12(O2CR)16(H2O)4]Journal of the American Chemical Society, 1993