Linked Life Data

19421620

Source:http://linkedlifedata.com/resource/pubmed/id/19421620

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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
17
pubmed:dateCreated
2009-5-7
pubmed:abstractText
Reactions of N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine (H(4)edte) with MnCl(2).4H(2)O or FeCl(3).6H(2)O in MeOH or MeCN with different bases yield four butterfly-like tetranuclear clusters with fused defective dicubane M(4)O(6) cores: [Mn(II)(2)Mn(IV)(2)(mu(4)-Hedte)(2)(thme)(2)].MeCN () (H(4)edte = N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine, H(3)thme = 1,1,1-tris(hydroxymethyl)ethane), [Mn(II)(2)Mn(IV)(2)(mu(4)-Hedte)(2)(thme)(2)].2MeOH (), [Fe(III)(4)(mu(4)-Hedte)(2)(N(3))(6)].2MeCN () and [Fe(III)(4)(mu(4)-edte)(2)(N(3))(4)(MeOH)(2)] (). Both and crystallize in the triclinic space group P1[combining macron], while and crystallize in the monoclinic space group P2(1)/c and P2(1)/n, respectively. The hexadentate Hedte(3-) ligand in , and the edte(4-) ligand in acts in a similar mu(4):eta(1):eta(1):eta(1):eta(2):eta(2):eta(3) coordination mode to bridge four metal ions into butterfly-like tetranuclear clusters with fused defective dicubane M(4)O(6) cores. Magnetic studies show that has the spin ground state S(T) = 8 while has the spin ground state S(T) = 0. Within the Mn(4)O(6) cluster core of , both Mn(iv)Mn(ii) and Mn(ii)Mn(ii) ferromagnetic interactions (J(Mn(iv)Mn(ii)) = +2.91 cm(-1) and J(Mn(ii)Mn(ii)) = +7.94 cm(-1)) occur contrary to the Fe(4)O(6) core, where antiferromagnetic exchange exists (J(aptical-Fe(iii)central-Fe(iii)) = -15.4 cm(-1) and J(central-Fe(iii)central-Fe(iii)) = -4.5 cm(-1)).
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1477-9226
pubmed:author
pubmed:issnType
Print
pubmed:day
7
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3182-92
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
High-spin tetranuclear Mn(II)(2)Mn(IV)(2) clusters with unique Mn(ii)-Mn(iv) magnetic exchange: synthesis, structures and magnetism.
pubmed:affiliation
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry/State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't