Synthesis and coordination chemistry of 2-(di-2-pyridylamino)pyrimidine; structural aspects of spin crossover in an Fe(II) complex

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dc.contributor.authorCrees, R.
dc.contributor.authorMoubaraki, B.
dc.contributor.authorMurray, K.
dc.contributor.authorSumby, C.
dc.date.issued2012
dc.descriptionThis paper was accepted on February 26 2012
dc.description.abstract2-(Di-2-pyridylamino)pyrimidine (L), a potentially ditopic tetradentate ligand, was synthesized from commercially available di-2-pyridylamine and 2-chloropyrimidine. Despite being capable of bridging two metal atoms with bidentate chelation of both metal centres, L prefers to chelate or bridge through the more basic pyridyl donors of the di-2-pyridylamine moiety. Mononuclear trans-[Fe(NCS)2(L)2] and [Cu(L)2(H2O)](BF4)2•H2O complexes, and a discrete [Ag2(L)4](PF6)2 metallomacrocycle were isolated and structurally characterized by X-ray crystallography. A mononuclear palladium complex [PdCl2(L)]•(solvate), where solvate = ½H2O or CH2Cl2, was also readily obtained in 71% yield. One example of the ligand acting as a bis(bidentate) bridging ligand was observed in a dinuclear [(PdCl2)2(L)]•¾H2O complex that was obtained only in very low yield (ca. 3%) from the reaction that produced [PdCl2(L)]•½H2O. trans-[Fe(NCS)2(L)2] undergoes a temperature dependent HS-LS (HS = high spin; LS = low spin) crossover at ca. 205 K that was 2 observed by X-ray crystallography and magnetic measurements and attempts were made to understand the structural basis of this process. Despite efforts to isolate examples of L bridging two iron(II) centres, only the mononuclear trans-[Fe(NCS)2(L)2] species could be obtained.
dc.description.statementofresponsibilityRachel S. Crees, Boujemma Moubaraki, Keith S. Murray, and Christopher J. Sumby
dc.identifier.citationAustralian Journal of Chemistry: an international journal for chemical science, 2012; 65(7):842-850
dc.identifier.doi10.1071/CH12045
dc.identifier.issn0004-9425
dc.identifier.issn1445-0038
dc.identifier.orcidSumby, C. [0000-0002-9713-9599]
dc.identifier.urihttp://hdl.handle.net/2440/69613
dc.language.isoen
dc.publisherC S I R O Publishing
dc.relation.granthttp://purl.org/au-research/grants/arc/FT0991910
dc.relation.granthttp://purl.org/au-research/grants/arc/LE0989336
dc.rightsCopyright CSIRO 2012
dc.source.urihttps://doi.org/10.1071/ch12045
dc.titleSynthesis and coordination chemistry of 2-(di-2-pyridylamino)pyrimidine; structural aspects of spin crossover in an Fe(II) complex
dc.typeJournal article
pubs.publication-statusPublished

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