Inclusion of metal complexes into cavities of 2D coordination networks built from p-sulfonatothiacalix[4]arene tetranuclear clusters

Reactions of the p-sulfonatothiacalix[4]arene salt (Na(4)H(4)TCAS) and MSO4 (M = Co, Cu) in the presence of 2,2'-bipyrazine (2,2'-bpz) generated 2 D coordination networks formed by tetranuclear cluster subunits, namely {[Co(2,2'-bpz)(H2O)(4)]C2+[Co-4(TCAS)(mu(4)-SO4)(H2O)(4)](2-). 10.75H(2)O}(n) (1) and {[Cu(2,2'-bpz)(H2O)(3)]C2+[Cu-4(TCAS)(mu(4)-SO4)(H2O)(4)](2-)center dot 16H(2)O}(n) (2). X-ray diffraction analyses reveal that both these complexes include metal-2,2'-bipyrazine complexes into the hydrophobic cavities of p-sulfonatothiacalix[4]arenes as guests through supramolecular interactions. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)