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Acknowledgements
The authors are grateful to Dr A. S. Azevedo for collecting the
powder diffraction data. IKB thanks FCT for the contract under
‘Programa Ciência 2007’. This work was supported by the Centro
de Química (University of Minho, Portugal) and by Fundação para
a Ciência e Tecnologia (FCT-Portugal), under programme POCTI-
SFA-3-686.
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