Abstract
The reaction of SnCl 2 with the sodium salts of orotic and 2-thioorotic acids under aerobic conditions leads to the formation of compounds with empirical formulae Sn(H 2or)·0.5H 2O and Sn(H 2thor) 3, where H 3ororotic acid and H 3thor2-thioorotic acid. Variable temperature 119mSn Mössbauer spectroscopy shows that these compounds contain tin in both the II and IV oxidation states. The Mössbauer data taken together with the vibrational and 1H NMR data lead to the conclusion that the two complexes are best formulated as [Sn 2 IISn 2 IVL 12] where L −H 2or − or H 2thor −. The central cluster of two Sn(II) and two Sn(IV) atoms is proposed to be held together by eight bidentate bridging carboxylate groups, each of which bridges one Sn(II) and one Sn(IV) atom, while the remaining four ligands appear to form links among the clusters via bridging carboxylate groups.
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