Source:http://linkedlifedata.com/resource/pubmed/id/11686605
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| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
19
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| pubmed:dateCreated |
2001-10-31
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| pubmed:abstractText |
The coordinatively unsaturated dinickel(II) complex [(L2)Ni2](BPh4)2 (2), where (L2)2- represents the dianionic form of the 'N4S2' ligand N,N'-bis(2-thio-3-aminomethyl-5-tert-butylbenzyl)propane-1,3-diamine), has been investigated with respect to its ability to function as a building block for the preparation of polynuclear nickel complexes with a high-spin ground state. Treatment of 2 with pyridazine (pydz) followed by addition of two equivalents of NH4SCN afforded the dinuclear mupyridazine complex [(L2)Ni2(mu-pydz)(NCS)2] (4). The reaction of 2 with pyridazine and NaN3 in a 1:1:1 molar ratio gave the tetranuclear nickel(II) complex [[(L2)Ni2(mu-pydz)(N3)]2](BPh4)2 (5). Both complexes have been characterized by X-ray crystallography and variable-temperature magnetic susceptibility studies. In complex 4 two fac(SCN)N2Ni(II) units are linked by two thiophenolate sulfur atoms and a mu-pydz ligand to give a (SCN)N2Ni(mu-S)2(mu-pydz)NiN2(NCS) core structure with a pseudoconfacial bioctahedral geometry. The two NCS- groups occupy opposite coordination sites, each is in a cis position to the pydz bridge. Analyses of the susceptibility data indicate the presence of an intramolecular ferromagnetic exchange interaction between the two Ni(II) (S = 1) ions. Complex 5 is composed of two binuclear [(L2)Ni2(mu-pydz)]2+ subunits which are linked by two azide ions to give a rectangular array of four six-coordinate Ni(II) ions. The binuclear [(L2)Ni2(mu-pydz)]2+ fragments in 4 and 5 are isostructural. Analyses of the susceptibility data of 5 reveal ferromagnetic exchange interactions between the Ni(II) ions of the binuclear subunit as well as for the mu(1,3)N3-bridged Ni(II) ions. Thus, compound 4 has an S = 2 ground state, whereas in 5 it is S = 4.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
Oct
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| pubmed:issn |
0947-6539
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| pubmed:author | |
| pubmed:issnType |
Print
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| pubmed:day |
1
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| pubmed:volume |
7
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
4253-8
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| pubmed:dateRevised |
2009-8-4
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| pubmed:year |
2001
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| pubmed:articleTitle |
Binuclear complexes as building blocks for polynuclear complexes with high-spin ground states: synthesis and structure of a tetranuclear nickel complex with an S = 4 ground state.
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| pubmed:affiliation |
Institut für Anorganische und Analytische Chemie, Universität Freiburg, Germany. kerstber@sun2.ruf.uni-freiburg.de
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| pubmed:publicationType |
Journal Article
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