Linked Life Data

17630682

Source:http://linkedlifedata.com/resource/pubmed/id/17630682

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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
16
pubmed:dateCreated
2007-7-30
pubmed:abstractText
Two new mixed-valence manganese-carboxylate clusters, [MnIII9MnIV6(O2CPh)12(micro3-O)13(micro-O)4(micro-OMe)5(MeOH)4(H2O)5]2.1.5PhCO2H.MeOH.6H2O (1, PhCO2H = benzoic acid) and [MnIII9MnIV6(O2CCh)12(micro3-O)13(micro-O)4(micro-OMe)5(MeOH)3(H2O)6].0.5MeOH.2.5H2O (2, ChCO2H= cyclohexanecarboxylic acid) contain new disklike Mn15 cores. Both 1 and 2 can be synthesized by the conventional manganese redox reaction (MnO4- oxidizing Mn2+) in methanol solution. 2 can be also synthesized via the site-specific ligand substitution reaction from 1. 1 crystallizes in the triclinic space group P, whereas 2 crystallizes in the trigonal space group P. Magnetic study shows that both 1 and 2 have the same ground spin states ST = 2. Compared to the silence of the out-of-phase ac susceptibility of 1, 2 shows clearly slow magnetic relaxation behavior above 1.8 K due to the dramatically enhanced axial magnetic anisotropy (D = -0.89 and -1.58 cm-1 for 1 and 2, respectively, which was obtained by fitting the plots of M vs H/T with the program ANISOFIT 2.0).
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0020-1669
pubmed:author
pubmed:issnType
Print
pubmed:day
6
pubmed:volume
46
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
6437-43
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
From pseudo to true C(3) symmetry: magnetic anisotropy enhanced by site-specific ligand substitution in two Mn(15)-carboxylate clusters.
pubmed:affiliation
MOE Laboratory of Bioinorganic and Synthetic Chemistry/State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry & Chemical Engineering, Sun Yat-Sen University, Guangzhou, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't