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Hydrated Lanthanoid Complexes of 5-(2′-Pyridyl)tetrazole Formed in the Presence of Dimethyl Sulfoxide *
Daniel
D'Alessio A,
Louise E.
Karagiannidis A B,
Brian W.
Skelton C,
Massimiliano
Massi A and
Mark I.
Ogden A D
A
Department of Chemistry, Curtin University, GPO Box U 1987, Perth, WA 6845, Australia. B
Chemistry, University of Southampton, Southampton, SO17 1BJ, UK. C
Centre for Microscopy, Characterisation and Analysis, M313, University of Western Australia, Perth, WA 6009, Australia. D
Corresponding author. Email: m.ogden@curtin.edu.au
Australian Journal of Chemistry
65(7)
819-822 http://dx.doi.org/10.1071/CH12031
Submitted: 19 January 2012 Accepted: 18 February 2012 Published:
2
April
2012
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Abstract
Reaction of DMSO solvates of lanthanoid nitrates or perchlorates with 5-(2′-pyridyl)tetrazole (pytz) and triethylamine in organic solvents resulted in the unexpected crystallization of hydrates, rather than DMSO solvates. This was confirmed by the structural characterization of [Eu(pytz)3(H2O)3]. Decreasing the metal:ligand ratio in the reaction mixture resulted in the crystallization of a complex salt formulated as [Y(pytz)2(H2O)4](pytz)·(Hpytz)·4H2O; once again DMSO was absent from the product. Interestingly, the omission of base from one reaction resulted in the serendipitous crystallization of Hpytz in a zwitterionic form, unlike the neutral ligand structure reported previously. 
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