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ChemInform Abstract The twelve purinophanes (I)-(IV) are prepared by either stepwise introduction of the linking chains or by quasi-dimerization of disubstituted purine derivatives. The five kinds of stacking geometries of the two component rings in the purinophanes are determined by X-ray analysis of (Ia), (IIa), (III), (IVa) and (IVd) (data submitted for publication) and/or 1H NMR. All compounds show large hypochromism values, which are correlated with the geometrical parameters from the X-ray results.

Eighteen isomeric dyes, each based on phenylazo-H-acid and containing two reactiue groups, namely a monochlorotriazine group and a sulphuric acid ester of Phydroxyethylsulphone, were applied to cotton fabric by an exhaustion process at 60°C. The following properties were studied: spectra, uptake curues ofthe dyes before and after adding sodium carbonate, affinity, diffusion rate, and rates of hydrolysis and of reaction with cellulose, as euidenced by fixation and colour yield. S o m e significant correlations were found, but some missingorpoorcorrelations indicated that there are further parameters or relationships between parameters that remain to be elucidated.