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Bipodal NЈ,NЈ,NٞNٞ-tetraalkyl-N,NЉ-phenylenedicarbonylbis(thiourea) readily 'self-assemble into' Pt 2 L 2 and Pt 3 L 3 metallamacrocyclic complexes depending on whether the S,O chelating moieties are meta or para relative to each other in the ligand. Thus treatment of PtCl 4 2with one equivalent of 3,3,3Ј,3Ј-tetra(n-butyl)-1,1Ј-terephthaloylbis(thiourea), {H 2 L 1 } 2 , leads to the exclusive formation of the cis-[Pt(L 1 -S,O)] 3 complex, while 3,3,3Ј,3Ј-tetraethyl-1,1Ј-isophthaloylbis(thiourea), {H 2 L 2 } 2 , yields only the cis-[Pt(L 2 -S,O)] 2 complex. The cis-[Pt(L 1 -S,O)] 3 complex forms extremely friable crystals, necessitating X-ray data collection in mother-liquor, the lattice of which was found to contain chloroform, water and ethanol molecules as 'guests'. By contrast, the sparingly soluble diethyl-substituted Pt 2 L 2 complex does not include solvent molecules in the crystal lattice.

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Structures of the inclusion compounds of five hydroxy-containing hosts with dioxane have been solved.Crystal data: 1, monoclinic, C2/c, a = 8.648( 1 ) A, b = 16.551 (1 ) A, c = 17.038(4) A, #I = go", V = 2398.64 A3, Z = 4; 2, triclinic, P i , a = 8.441 ( 8 ) A, b = 10.544(2) A, c = 11.562(2) A, 01 =67.47(1)", /I = 83.96(5)", y = 89.08(5)", V = 944.94 A3, Z = 2; 3, triclinic, P i , a = 9.378(7) A, b = * For details of the deposition scheme see 'Instructions for Authors',

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