NDLI: Structure and magnetism of decanuclear and octadecanuclear manganese(II/III) triethanolamine clusters

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Dalton Transactions Vol - 0 Issue - 5

Structure and magnetism of decanuclear and octadecanuclear manganese(II/III) triethanolamine clusters

Content Provider	Royal Society of Chemistry (RSC)
Author	Berry, Kevin J. Moubaraki, Boujemaa Langley, Stuart K. Murray, Keith S.
Copyright Year	2009
Abstract	Two new potential single molecule magnets [Mn10O3(O2CCH3)6(tea)(teaH)3(teaH2)3][NO3]2·3H2O (1) and [Mn18(N3)12O12(tea)2(teaH)4(OMe)(MeOH)]·2MeOH·H2O·Et2O (2) have been synthesised using manganese(II) nitrate, the tripodal ligand triethanolamine (teaH3) and co-ligands such as acetate for 1 and azide for 2. Both compounds are mixed-valent with 1 consisting of 4 Mn(II) and 6 Mn(III) ions and 2 consisting of 3 Mn(II) and 15 Mn(III) ions. Complex 1 has a near planar Mn7(II/III) disc-like core with 3 Mn(II) ions positioned on the periphery of the disc, forming a star-like geometry. Complex 2 contains a hexa-capped truncated tetrahedral core. Variable temperature DC magnetic susceptibility data collected in 2, 1, 0.1 and 0.01 T fields, and in the 2–300 K temperature range, for 1 and 2, indicate a large ground spin-state for both compounds. Using a new approach to calculating the DC Mvs. H isotherms (or isofield Mvs. H/T curves) by means of the thermal population of Zeeman levels generated from a group of closely spaced S states (within 9 cm−1 of ground), the ground S of 1 is 10. The ZFS term, D, is close to zero. For 2, the magnetisation isotherms, and low temperature susceptibilities, point to a ground state spin of 21/2 with many closely spaced spin states (probably from 17/2 to 35/2) close in energy, the lowest Zeeman level energies of which change as the field increases. AC magnetic susceptibility data show frequency-dependent out-of-phase signals indicating both clusters are possibly single molecule magnets. Extrapolation of the in-phase component, χ'MT, to 0 K suggests spin ground state of S = 10 for 1 and 21/2 for 2, in agreement with the DC data.
Starting Page	973
Ending Page	982
Page Count	10
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	0
Issue Number	6
Journal	Dalton Transactions
DOI	10.1039/b814407a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	AC Zeeman Tea Properties of water Manganese(II) nitrate Tripodal ligand Triethanolamine Azide Molecular geometry Magnetic susceptibility ZFS Extrapolation Tonne
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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