Six 1-aroyl-4-(4-meth-oxy-phen-yl)piperazines: similar mol-ecular structures but different patterns of supra-molecular assembly.

On this basis the C—H⋯O contacts in (II) can be regarded as significant, while the nearly linear C—H⋯O contacts in (III)–(V), which appear in each case to act cooperatively with a C–H⋯π hydrogen bond should be regarded as of marginal significance in (III) and (V) .

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