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A series of soluble, discrete homo and heteroleptic Ca(II) complexes of hexanuclear sulfidochloride rhenium clusters, [Ca(X)n(Y)m][Re6S6Cl8], (n=6, m=0, X=DMF, THF, DMSO; n=4, m=3, X=MeCN, Y=THF, dioxane) and the 1D co-ordination polymer [Ca(MeCN)3(OH2)2(