Aggregation of platinum-containing complexes SAF-33, SAF-31, SAF-20 and SAF-12 was studied by 1H and 195Pt NMR spectroscopy in CDCl3 solution. The considered molecules contain the same heterocyclic chromophore with a chlorine atom bound to platinum and differ in the structure of the side chains: SAF-12, SAF-20 and SAF-33 contain linear hydrocarbon chains of different lengths, while SAF-31 contains an aromatic ring with three linear hydrocarbon chains attached to it. The analysis of experimental data was carried out using four models of self-association. In SAF-12, SAF-20 and SAF-33, the self-association constants coincide within the error of their determination, while in SAF-31 this parameter is significantly higher. It is concluded that the self-association constant of the studied compounds significantly depends on the structure of their side chains, while the aggregation is anticooperative.
NMR spectroscopy, luminescent platinum-containing complexes, self-association
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