Coordinative flexibility of 1,2-bis[1,4,7-triazacyclonon-1-yl]propan-2-ol in mononuclear and binuclear Ni(II) complexes

Warren, Mark, Battle, Andrew R., Moubaraki, Boujemaa, Murray, Keith S., Spiccia, Leone, Skelton, Brian W. and White, Allan H. (2004) Coordinative flexibility of 1,2-bis[1,4,7-triazacyclonon-1-yl]propan-2-ol in mononuclear and binuclear Ni(II) complexes. Dalton Transactions, 15: 2309-2313. doi:10.1039/B405320F

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Author Warren, Mark
Battle, Andrew R.
Moubaraki, Boujemaa
Murray, Keith S.
Spiccia, Leone
Skelton, Brian W.
White, Allan H.
Title Coordinative flexibility of 1,2-bis[1,4,7-triazacyclonon-1-yl]propan-2-ol in mononuclear and binuclear Ni(II) complexes
Journal name Dalton Transactions   Check publisher's open access policy
ISSN 1472-7773
1477-9226
1477-9234
1470-479X
Publication date 2004
Sub-type Article (original research)
DOI 10.1039/B405320F
Open Access Status File (Publisher version)
Issue 15
Start page 2309
End page 2313
Total pages 5
Place of publication London, U.K.
Publisher Royal Society of Chemistry
Language eng
Subject 0302 Inorganic Chemistry
Formatted abstract
Reaction of 1,2-bis[1,4,7-triazacyclonon-1-yl]propan-2-ol hexabromide (T2PrOH.6HBr) with Ni(ClO4)2·6H2O and adjustment of the pH to 7 resulted in the crystallization of pink and blue products from the one reaction mixture. The analytical data and X-ray structure determinations establish compositions corresponding to [Ni(T2PrOH)]Br(ClO4)·H2O ( 1, pink crystals) and [Ni2(T2PrO)(OH2)3Br]Br(ClO4)·2H2O ( 2, blue crystals). A repeat synthesis of the latter yielded the diperchlorate monohydrate [Ni2(T2PrO)(OH2)3Br](ClO4)2·H2O ( 3). In the mononuclear complex ( 1), the 2-propanol group connecting the two 1,4,7-trizacyclononane (tacn) rings is protonated, the six nitrogen donors from the T2PrOH ligand coordinating to a single Ni(II) centre in a distorted octahedral geometry. In the binuclear complexes ( 2) and ( 3), three coordination sites on each distorted octahedral Ni(II) centre are occupied fac by three nitrogen donors from the one tacn ring, the two metal centres being linked by an endogenous alkoxo bridge. A notable common feature of the two identical cations of ( 2) and ( 3) is that for one Ni(II) centre the remaining two sites are occupied by two water ligands, while in the other a bromo ligand replaces one ligated water. Similar binuclear systems have been recently defined [Zn2(T2PrO)X(H2O)2](ClO4)2(X = Cl, Br), two complexes that exhibit coordination asymmetry with one pseudo-octahedral and one pseudo-square pyramidal Zn(II) centre. The weak antiferromagnetic coupling in 2 and 3 is discussed and compared to di-phenoxo-bridged Ni(II) examples.
Keyword Magnetic exchange interaction
Nickel(II) complexes
Macrocyclic ligands
Zinc(II) complexes
Metal-complexes
Series
Cleavage
Crystal
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Biomedical Sciences Publications
 
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