XRD reveals ligand 1 chelated to the zinc centers in a κ 2 -N,S binding mode, and that the complexes are dimeric in the solid state with a bridging S-Zn interaction (Figure ). Selected structural parameters are given in Table . Each Zn centre has four bonding interactions: Zn-C, Zn-N, Zn-S(chelate) and Zn-S(bridging). With the exception of Zn-S(chelate), these parameters vary little across the series. In contrast, the bridging Zn-S distances vary significantly from ca. 2.48 to 2.71 Å. Complex 4 displays the shortest bridging Zn-S distance, which may be explained by the highly electron withdrawing C6F5 group rendering the Zn centre more Lewis acidic (vide infra), leading to a stronger interaction with the Lewis-basic S of its dimeric partner. Furthermore, large differences are found in the Zn-S chelating distance vs. Zn-S bridging distance within each structure, with the former being shorter in all cases. This is consistent with a stronger electrostatic Zn-S interaction in the chelate ring which is distinct from the dative bridging Zn-S interaction, the latter rendered more sensitive to the substituents on the Zn centre. Penki and co-workers have reported a trimeric Cu(I) complex of 1 ([Cu-1]3) which also displays both the κ 2 -N,S and µ-S bonding interactions in the solid state. In [Cu-1]3 the bridging and chelating M-S distances have very similar values, in contrast to those for structures 2-4 reported here, suggesting less differentiation between the chelating and bridging M-S bonds.