Platinum(II) and Palladium(II) Metallacycles Derived from Cationic 4,4’-Bipyridinium, 3-Aminopyrazinium and 2-Aminopyrimidinium Ligands Schilter, David en_US Clegg, Jack en_US Harding, Margaret en_US Rendina, Louis en_US 2021-11-25T16:43:57Z 2021-11-25T16:43:57Z 2010 en_US
dc.description.abstract A series of cationic, ditopic N-donor ligands based on 4,4-bipyridine (4,4-bipy), 3-aminopyrazine (apyz) and 2-aminopyrimidine (apym), each incorporating two positively-charged N-heterocycles linked by a conformationally-flexible spacer unit, have been synthesised and treated with palladium(II) or platinum(II) precursors [M(2,2-bipy)(NO3)2] (M = Pd(II) or Pt(II)) to form highly cationic metallocyclic species. Treatment of 1,6-bis(4,4-bipyridinium)hexane nitrate with [M(2,2-bipy)(NO3)2] in aqueous solution, followed by the addition of KPF6, resulted in the formation of the [2+2] species [M2(2,2-bipy)2{4,4-bipy(CH2)64,4-bipy}2](PF6)8. Treatment of [Pd(PhCN)2Cl2] with 1,3-bis(4,4-bipyridinium)propane hexafluorophosphate in MeCN afforded [Pd2Cl4{4,4-bipy(CH2)34,4-bipy}2](PF6)4. When the cationic apyz or apym ligands were used in aqueous solution, the analogous metallomacrocycles did not form. Instead, deprotonation of the exocyclic amino group occurred upon coordination of the ligand to afford a tetranuclear [4+2] species in the case of platinum(II), with Pt(II)Pt(II) bonding supported by strong UV-vis absorption at = 428 nm which was assigned to a metal-metal-to-ligand charge transfer (MMLCT) band. Thus, treatment of 1,6-bis(3-aminopyrazinium)hexane nitrate with [Pt(2,2-bipy)(NO3)2], followed by the addition of KPF6, led to the formation of the red species [Pt4(2,2-bipy)4{apyz(CH2)6apyz–2H}2](PF6)8. No related products could be identified with palladium(II), consistent with the low propensity for this metal ion to form strong Pd(II)Pd(II) bonding interactions en_US
dc.identifier.issn 1477-9226 en_US
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.subject.other metallomacrocycle en_US
dc.subject.other Inorganic Chemistry (030200) en_US
dc.subject.other Bioinorganic Chemistry (030201) en_US
dc.title Platinum(II) and Palladium(II) Metallacycles Derived from Cationic 4,4’-Bipyridinium, 3-Aminopyrazinium and 2-Aminopyrimidinium Ligands en_US
dc.type Journal Article en
dcterms.accessRights metadata only access
dspace.entity.type Publication en_US
unsw.identifier.doiPublisher en_US
unsw.relation.faculty Science
unsw.relation.ispartofissue 46 en_US
unsw.relation.ispartofjournal Journal of the Royal Chemical Society, Dalton Transactions en_US
unsw.relation.ispartofpagefrompageto 11263-11271 en_US
unsw.relation.ispartofvolume 39 en_US
unsw.relation.originalPublicationAffiliation Schilter, David en_US
unsw.relation.originalPublicationAffiliation Clegg, Jack en_US
unsw.relation.originalPublicationAffiliation Harding, Margaret , Chemistry, Faculty of Science, UNSW en_US
unsw.relation.originalPublicationAffiliation Rendina, Louis en_US School of Chemistry *
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