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Article: Coordinative versatility of 2,3-bis(2-pyridyl)-5,8-dimethoxyquinoxaline (L) to different metal ions: Syntheses, crystal structures and properties of [Cu(I)L]22+ and [ML]2+ (M=Cu(II), Ni(II), Zn(II) and Co(II))

TitleCoordinative versatility of 2,3-bis(2-pyridyl)-5,8-dimethoxyquinoxaline (L) to different metal ions: Syntheses, crystal structures and properties of [Cu(I)L]22+ and [ML]2+ (M=Cu(II), Ni(II), Zn(II) and Co(II))
Authors
Keywords2,3-Bis(2-Pyridyl)-5,8-Dimethoxyquinoxaline
Crystal Structures
Cu(I), Cu(Ii), Ni(Ii), Zn(Ii) And Co(Ii) Complexes
Electrochemistry
Spectra
Issue Date2002
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/ica
Citation
Inorganica Chimica Acta, 2002, v. 333, p. 32-40 How to Cite?
AbstractThe complexes of Cu(I), Cu(II), Ni(II), Zn(II) and Co(II) with a new polypyridyl ligand, 2,3-bis(2-pyridyl)-5,8-dimethoxyquinoxaline (L), have been synthesized and characterized. The crystal structures of these complexes have been elucidated by X-ray diffraction analyses and three types of coordination modes for L were found to exist in them. In the dinuclear complex [Cu(I)L(CH3CN)]2·(ClO4)2 (1), L acts as a tridentate ligand with two Cu(I) centers bridged by two L ligands to form a box-like dimeric structure, in which each Cu(I) ion is penta-coordinated with three nitrogen atoms and a methoxyl oxygen atom of two L ligands, and an acetonitrile. In [Cu(II)L(NO3)2] ·CH3CN 2, the Cu(II) center is coordinated to the two nitrogen atoms of the two pyridine rings of L which acts as a bidentate ligand. The structures of [Ni(II)L(NO3)(H2O)2] ·2CH3CN·NO3 (3), [Zn(II)L(NO 3)2 (H2O)]·2CH3CN (4) and [Co(II)LCl2(H2O)] (5) are similar to each other in which L acts as a tridentate ligand by using its half side, and the metal centers are coordinated to a methoxyl oxygen atom and two bipyridine nitrogen atoms of L in the same side. The formation of infinite quasi-one-dimensional chains (1, 4 and 5) or a quasi-two-dimensional sheet (2) assisted by the intra- or intermolecular face-to-face aryl stacking interactions and hydrogen bonds may have stabilized the crystals of these complexes. Luminescence studies showed that 1 exhibits broad, structureless emissions at 420 nm in the solid state and at 450 nm in frozen alcohol frozen glasses at 77 K. Cyclic voltammetric studies of 1 show the presence of an irreversible metal-centered reduction wave at approximately -0.973 V versus Fc+/0 and a quasi-reversible ligand-centered reduction couple at approximately -1.996 V versus Fc +/0. The solution behaviors of these complexes have been further studied by UV-Vis and ESR techniques. © 2002 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/167804
ISSN
2015 Impact Factor: 1.918
2015 SCImago Journal Rankings: 0.584
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorBu, XHen_US
dc.contributor.authorLiu, Hen_US
dc.contributor.authorDu, Men_US
dc.contributor.authorWong, KMCen_US
dc.contributor.authorYam, VWWen_US
dc.date.accessioned2012-10-08T03:11:50Z-
dc.date.available2012-10-08T03:11:50Z-
dc.date.issued2002en_US
dc.identifier.citationInorganica Chimica Acta, 2002, v. 333, p. 32-40en_US
dc.identifier.issn0020-1693en_US
dc.identifier.urihttp://hdl.handle.net/10722/167804-
dc.description.abstractThe complexes of Cu(I), Cu(II), Ni(II), Zn(II) and Co(II) with a new polypyridyl ligand, 2,3-bis(2-pyridyl)-5,8-dimethoxyquinoxaline (L), have been synthesized and characterized. The crystal structures of these complexes have been elucidated by X-ray diffraction analyses and three types of coordination modes for L were found to exist in them. In the dinuclear complex [Cu(I)L(CH3CN)]2·(ClO4)2 (1), L acts as a tridentate ligand with two Cu(I) centers bridged by two L ligands to form a box-like dimeric structure, in which each Cu(I) ion is penta-coordinated with three nitrogen atoms and a methoxyl oxygen atom of two L ligands, and an acetonitrile. In [Cu(II)L(NO3)2] ·CH3CN 2, the Cu(II) center is coordinated to the two nitrogen atoms of the two pyridine rings of L which acts as a bidentate ligand. The structures of [Ni(II)L(NO3)(H2O)2] ·2CH3CN·NO3 (3), [Zn(II)L(NO 3)2 (H2O)]·2CH3CN (4) and [Co(II)LCl2(H2O)] (5) are similar to each other in which L acts as a tridentate ligand by using its half side, and the metal centers are coordinated to a methoxyl oxygen atom and two bipyridine nitrogen atoms of L in the same side. The formation of infinite quasi-one-dimensional chains (1, 4 and 5) or a quasi-two-dimensional sheet (2) assisted by the intra- or intermolecular face-to-face aryl stacking interactions and hydrogen bonds may have stabilized the crystals of these complexes. Luminescence studies showed that 1 exhibits broad, structureless emissions at 420 nm in the solid state and at 450 nm in frozen alcohol frozen glasses at 77 K. Cyclic voltammetric studies of 1 show the presence of an irreversible metal-centered reduction wave at approximately -0.973 V versus Fc+/0 and a quasi-reversible ligand-centered reduction couple at approximately -1.996 V versus Fc +/0. The solution behaviors of these complexes have been further studied by UV-Vis and ESR techniques. © 2002 Elsevier Science B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/icaen_US
dc.relation.ispartofInorganica Chimica Actaen_US
dc.subject2,3-Bis(2-Pyridyl)-5,8-Dimethoxyquinoxalineen_US
dc.subjectCrystal Structuresen_US
dc.subjectCu(I), Cu(Ii), Ni(Ii), Zn(Ii) And Co(Ii) Complexesen_US
dc.subjectElectrochemistryen_US
dc.subjectSpectraen_US
dc.titleCoordinative versatility of 2,3-bis(2-pyridyl)-5,8-dimethoxyquinoxaline (L) to different metal ions: Syntheses, crystal structures and properties of [Cu(I)L]22+ and [ML]2+ (M=Cu(II), Ni(II), Zn(II) and Co(II))en_US
dc.typeArticleen_US
dc.identifier.emailWong, KMC:wongmc@hku.hken_US
dc.identifier.emailYam, VWW:wwyam@hku.hken_US
dc.identifier.authorityWong, KMC=rp00809en_US
dc.identifier.authorityYam, VWW=rp00822en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0020-1693(02)00806-Xen_US
dc.identifier.scopuseid_2-s2.0-0038772834en_US
dc.identifier.hkuros73861-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0038772834&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume333en_US
dc.identifier.spage32en_US
dc.identifier.epage40en_US
dc.identifier.isiWOS:000175741300005-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridBu, XH=7103052967en_US
dc.identifier.scopusauthoridLiu, H=8712651900en_US
dc.identifier.scopusauthoridDu, M=7201997484en_US
dc.identifier.scopusauthoridWong, KMC=8061067200en_US
dc.identifier.scopusauthoridYam, VWW=18539304700en_US

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