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Figure 3
Second-level R42(8) or R44(12) hydrogen-bond motifs in (a) 1,1,3,3-tetra­methyl­guanidinium di­hydrogen ortho­phosphate (Criado et al., 2000BB8), (b) 1,1,3,3-tetra­methyl­guanidinium propionate (King et al., 2011BB11), (c) di­cyclo­hexyl­ammonium 4-nitro­phenyl­sulfinate (Brito et al., 2006BB6) and (d) N-[2-(3-meth­oxy­phen­oxy)prop­yl]-m-tolyl­acetamidinium p-toluene­sul­fon­ate monohydrate (Blaton et al., 1995BB5). In (d), the water molecule has been omitted and the substituted phenyl rings are shown as small spheres for clarity. The small circles in (a), (c) and (d) indicate crystallographic inversion centres.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
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