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Article: Electrochemical studies of nickel(II) and cobalt(II) complexes of tetra-azamacrocycles bearing a pyridine functional group and X-ray structures of [NiII(L3)Cl]ClO4 and [NiII(L3)][ClO4]2·H 2O {L3 = meso-2,3,7,11,12-pentamethyl-3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1(17), 13,15-triene}

TitleElectrochemical studies of nickel(II) and cobalt(II) complexes of tetra-azamacrocycles bearing a pyridine functional group and X-ray structures of [NiII(L3)Cl]ClO4 and [NiII(L3)][ClO4]2·H 2O {L3 = meso-2,3,7,11,12-pentamethyl-3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1(17), 13,15-triene}
Authors
Issue Date1988
PublisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/dalton
Citation
Journal Of The Chemical Society, Dalton Transactions, 1988 n. 8, p. 2153-2159 How to Cite?
AbstractThe new complexes [NiII(L3)Cl]ClO4 (1), [CoII(L3)(CH3CN)][ClO4]2, and [NiII(L3)][ClO4]2·H 2O (2) {L3 = meso-2,3,7,11,12-pentamethyl-3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1 (17),13,15-triene} have been prepared. Their redox chemistry and electrocatalytic behaviour in the CO2 reduction process were studied in comparison with related cobalt(II)-and nickel(II)-tetra-azamacrocyclic systems. The complex cation in (1) [monoclinic, space group P21/n, a = 9.457(4), b = 17.614(3), c = 14.078(4) Å, β = 107.39(2)°, Z = 4, R = 0.065 for 2 812 observed Mo-Kα data] is isostructural with the distorted tetragonal pyramidal CoII analogue. The increased atomic number of the nickel centre is reflected in a significant shortening (by ca. 0.03 Å) of the metal-N bond distances. In (2) [monoclinic, space group P21/c, a = 10.248(1), b = 17.958(4), c = 13.538(3) Å, β = 90.48(2)°, Z = 4, R = 0.076 for 3 310 observed Mo-Kα data] the two independent ClO4 - groups are bridged by the water molecule through hydrogen bonding, and one ClO4 - group is unidentately bound to the 'square-planar' metal atom by a long Ni-O bond of 2.838(7) Å. The macrocyclic L3 ligand adopts different conformations in (1) and (2): the substituted methyl groups at N(2) and N(4) are oriented anti with respect to each other in (1), but bear a syn relationship in (2).
Persistent Identifierhttp://hdl.handle.net/10722/168216
ISSN
2002 Impact Factor: 3.023
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DC FieldValueLanguage
dc.contributor.authorChe, CMen_US
dc.contributor.authorMak, Sen_US
dc.contributor.authorLee, Wen_US
dc.contributor.authorFung, Ken_US
dc.contributor.authorMak, TCWen_US
dc.date.accessioned2012-10-08T03:16:20Z-
dc.date.available2012-10-08T03:16:20Z-
dc.date.issued1988en_US
dc.identifier.citationJournal Of The Chemical Society, Dalton Transactions, 1988 n. 8, p. 2153-2159en_US
dc.identifier.issn1472-7773en_US
dc.identifier.urihttp://hdl.handle.net/10722/168216-
dc.description.abstractThe new complexes [NiII(L3)Cl]ClO4 (1), [CoII(L3)(CH3CN)][ClO4]2, and [NiII(L3)][ClO4]2·H 2O (2) {L3 = meso-2,3,7,11,12-pentamethyl-3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1 (17),13,15-triene} have been prepared. Their redox chemistry and electrocatalytic behaviour in the CO2 reduction process were studied in comparison with related cobalt(II)-and nickel(II)-tetra-azamacrocyclic systems. The complex cation in (1) [monoclinic, space group P21/n, a = 9.457(4), b = 17.614(3), c = 14.078(4) Å, β = 107.39(2)°, Z = 4, R = 0.065 for 2 812 observed Mo-Kα data] is isostructural with the distorted tetragonal pyramidal CoII analogue. The increased atomic number of the nickel centre is reflected in a significant shortening (by ca. 0.03 Å) of the metal-N bond distances. In (2) [monoclinic, space group P21/c, a = 10.248(1), b = 17.958(4), c = 13.538(3) Å, β = 90.48(2)°, Z = 4, R = 0.076 for 3 310 observed Mo-Kα data] the two independent ClO4 - groups are bridged by the water molecule through hydrogen bonding, and one ClO4 - group is unidentately bound to the 'square-planar' metal atom by a long Ni-O bond of 2.838(7) Å. The macrocyclic L3 ligand adopts different conformations in (1) and (2): the substituted methyl groups at N(2) and N(4) are oriented anti with respect to each other in (1), but bear a syn relationship in (2).en_US
dc.languageengen_US
dc.publisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/daltonen_US
dc.relation.ispartofJournal of the Chemical Society, Dalton Transactionsen_US
dc.titleElectrochemical studies of nickel(II) and cobalt(II) complexes of tetra-azamacrocycles bearing a pyridine functional group and X-ray structures of [NiII(L3)Cl]ClO4 and [NiII(L3)][ClO4]2·H 2O {L3 = meso-2,3,7,11,12-pentamethyl-3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1(17), 13,15-triene}en_US
dc.typeArticleen_US
dc.identifier.emailChe, CM:cmche@hku.hken_US
dc.identifier.authorityChe, CM=rp00670en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1039/DT9880002153en_US
dc.identifier.scopuseid_2-s2.0-37049078551en_US
dc.identifier.issue8en_US
dc.identifier.spage2153en_US
dc.identifier.epage2159en_US
dc.identifier.isiWOS:A1988P799500027-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridChe, CM=7102442791en_US
dc.identifier.scopusauthoridMak, S=15129924400en_US
dc.identifier.scopusauthoridLee, W=7407087172en_US
dc.identifier.scopusauthoridFung, K=7202934752en_US
dc.identifier.scopusauthoridMak, TCW=7401931058en_US

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