The structure of a second crystal polymorph of silver(I) 2,6-dihydroxybenzoate

Thomas C. W. Mak, Graham Smith and Colin H. L. Kennard


The structure of a second crystal polymorph of silver(I) 2,6-dihydroxybenzoate, [Ag2((OH)2 · C6H3COO)2]n has been determined by X-ray diffraction and refined to a residual R = 0.036 for 1332 observed reflections. Crystals are monoclinic, space group P21/n with two dimeric units in a cell of dimensions a = 7.090(1), b = 11.693(2), c = 8.164(1)Å, β = 90.58(1)°. As in the first reported polymorph, the structure contains centrosymmetric bis(carboxylato-O,O′) bridged silver dimers. In the present structure, the dimers are cross-linked via Ag–O (hydroxyl) bonds [2.607(3)Å] to form a sheet polymer, whereas those in the earlier structure are discrete. Chelate-ring dimensions are essentially unchanged [Ag–O, 2.220, 2.236(3) cf. 2.203, 2.240(4)Í; Ag–Ag, 2.926(1) cf. 2.910(1)Å].

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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.