Self-assembly of 2∶2 and 3∶3 metallamacrocyclic complexes of platinum(II) with symmetrical, bipodal N′,N′,N[hair space]N[hair space]‴-tetraalkyl-N,N[hair space]″-phenylenedicarbonylbis(thiourea)

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Klaus R. Koch, Susan A. Bourne, Anita Coetzee and Jörn Miller


Abstract

Bipodal N[hair space]′,N[hair space]′,N[hair space]N[hair space]-tetraalkyl-N,N[hair space]″-phenylenedicarbonylbis(thiourea) readily ‘self-assemble into’ Pt2L2 and Pt3L3 metallamacrocyclic complexes depending on whether the S,O chelating moieties are meta or para relative to each other in the ligand. Thus treatment of PtCl42– with one equivalent of 3,3,3′,3′-tetra(n-butyl)-1,1′-terephthaloylbis(thiourea), {H2L1}2, leads to the exclusive formation of the cis-[Pt(L1-S,O)]3 complex, while 3,3,3′,3′-tetraethyl-1,1′-isophthaloylbis(thiourea), {H2L2}2, yields only the cis-[Pt(L2-S,O)]2 complex. The cis-[Pt(L1-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 Pt2L2 complex does not include solvent molecules in the crystal lattice.


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