Fig. 4. (a) PXRD patterns of the starting material C4N-HST and its reaction products with α,ω-alkanediols (HOCnH2nOH, n = 2, 3, 4, 7, 8, 9, 12). (b) Left: Relation between the number of carbon atoms in the aliphatic chain of α, ω-alkanediols and the interlayer distance of the corresponding grafted products (full line corresponds to the best linear fit for the longer diols (see text)). Right: Schemes of the pillaring arrangement of α, ω-alkanediols with long alkyl chains (top) and of the bilayer arrangement of ethyleneglycol or of 1,3-propanediol. (c) IR spectra of ethylene glycol, 1,3-propanediol, 1,4-butanediol, C2(OH)2-HST, C3(OH)2-HST and C4(OH)2-HST.
