It has been shown that the presence of a methylenedioxy substituent in a planar aromatic molecule tends to favour its crystallisation in highly overlapped structures. Thus, in a series of methylenedioxycinnamic acid derivatives, there is a preference for the P-structure over the U -and y-forms. It is suggested that this substituent is a good steering device towards the p-form since, in this form, the oxygen atoms of the substituent can participate in stabilising non-bonded interactions involving p electrons and further, the compactness of the substituent allows the molecules to crystallise with a 4 A repeat. The crystal-structure determination of 3,4-methylenedjoxycinnamic acid, (1 ), illustrates these concepts. The crystals of (1 ) are triclinic, the space group is PI, Z = 2, a = 3.804(3), b = 10.502(5), c = 11.1 12(4) A, u = 77.84(4),

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Table S1. In vitro antimicrobial activity of synthesized compounds through agar welldiffusion method. Inhibition zone of free ligand 9-(((5-mercapto-4H-1,2,4-triazole-4yl)imino)methyl)-anthracene and its metal complexes with nickel, copper, zinc and cadmium ions. CompoundsDiameter of growth of inhibition zone (mm) a

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Die Kristallchemie von Zimtsäurederivaten wird in Hinsicht auf den Einfluß untersucht, den die Beteiligung von Alkoxygruppen an Wechselwirkungen ohne Bindungsbildung ausübt.