Publication Date:
2014-10-08
Description:
Two new compounds with Co-centered Sn 9 clusters were obtained by the extraction directly from the intermetallic precursor K 4.79 Co 0.79 Sn 9 in ethylenediamine with addition of cryptand [2.2.2]. The anions [Co 0.68 @Sn 9 ] 4– in K[K([2.2.2]crypt)] 3 [Co 0.68 @Sn 9 ] ( 1 ) consisting of overlaying [Co@Sn 9 ] 4– and [Sn 9 ] 4– cluster anions are connected by K atoms to form infinite K[Co 0.68 @Sn 9 ] chains. The anions [Co 2 @Sn 17 ] 5– in [K([2.2.2]crypt)] 5 [Co 2 @Sn 17 ] · en · tol ( 2 ) are built from two [Co@Sn 9 ] sharing one common Sn atom, with the same composition but a different conformation as in the previously reported [K([2.2.2]crypt)] 5 [Co 2 @Sn 17 ]. Quantum chemical calculations for the different conformers of [Co 2 @Sn 17 ] 5– reveal that both conformers are rather close in energy and that the short intercluster Sn–Sn distance in 2 does not originate from attractive interactions.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
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