dc.contributor.author |
Boyd, Peter |
en |
dc.contributor.author |
MARTIN, RL |
en |
dc.contributor.author |
SCHWARZENBACH, G |
en |
dc.date.accessioned |
2011-09-14T22:08:41Z |
en |
dc.date.issued |
1988-01-01 |
en |
dc.identifier.citation |
AUST J CHEM 41(9):1449-1456 1988 |
en |
dc.identifier.issn |
0004-9425 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/7940 |
en |
dc.description.abstract |
The bulk magnetic susceptibility of the complex Ni4(chta)4(μ-OH)4(NO3)4.7H2O ( chta = cyclohexane-r-1,c-3,c-5-triamine) has been measured over the temperature range from 1.9 to 300 K at a field of 1 T. The observed data were fitted by a Heisenberg exchange model for the susceptibility of a cubane [Ni4II(μ-OH)4]4+ cluster with a single exchange interaction J between each pair of NiII ions for a single ion g value 2.20 and an antiferromagnetic spin-spin coupling parameter 2J = -1.14 cm-1. The bulk magnetization measured at fields of 1 to 5 T in the temperature range from 5 to 1.9 K differed from that calculated from the simple Heisenberg model above. Several possibilities were examined for this deviation including intercluster interactions, single ion zero-field splitting and differing exchange coupling constants between nickel(II) ions in the cluster. This last model was successful in describing the complete set of magnetic data. A comparison with other known oxygen-bridged nickel(II) cubane clusters shows a change from antiferromagnetic to ferromagnetic coupling as the Ni-O-Ni bond angle decreases. It appears that the cubane cluster studied here is in a region very close to the crossover from antiferromagnetic to ferromagnetic coupling between the nickel ions. |
en |
dc.language |
English |
en |
dc.publisher |
C S I R O PUBLICATIONS |
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dc.relation.ispartofseries |
AUSTRALIAN JOURNAL OF CHEMISTRY |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0004-9425/ |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.subject |
Science & Technology |
en |
dc.subject |
Physical Sciences |
en |
dc.subject |
Chemistry, Multidisciplinary |
en |
dc.subject |
Chemistry |
en |
dc.title |
SPIN SPIN INTERACTIONS IN POLYNUCLEAR NICKEL(II) COMPLEXES - A LOW-TEMPERATURE SUSCEPTIBILITY AND MAGNETIZATION STUDY OF THE CUBANE TETRANUCLEAR COMPLEX NI4(II)(CYCLOHEXANE-R-1,C-3,C-5-TRIAMINE)4(MU-OH)4(NO3)4.7H2O |
en |
dc.type |
Journal Article |
en |
dc.identifier.doi |
10.1071/CH9881449 |
en |
pubs.issue |
9 |
en |
pubs.begin-page |
1449 |
en |
pubs.volume |
41 |
en |
dc.rights.holder |
Copyright: 1988 CSIRO |
en |
pubs.author-url |
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=A1988R128900020&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=6e41486220adb198d0efde5a3b153e7d |
en |
pubs.end-page |
1456 |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Article |
en |
pubs.elements-id |
153700 |
en |
pubs.record-created-at-source-date |
2013-06-05 |
en |