Endocyclic and Endo–Exocyclic Silver(I) Complexes of Thiaoxaaza Macrocycles: Crystallographic and NMR Studies
نویسندگان
چکیده
Acomparative investigation of the coordination behaviour of a 19-memberedNO2S2-macrocycle (L ) and a 20-membered NO2S3-macrocycle (L ) is reported. On silver(I) complexation, L yields a discrete endocyclic mononuclear complex, whereasL affords a one-dimensional coordination polymer inwhich the endo-coordinatedmacrocyclic complex units are linked by silver(I) ions outside the cavity via endo–exo-coordination. The larger ring cavity along with the flexible nature of Lmay induce the weaker endocyclic complexation and contribute to exocyclic coordination as well. In NMR titration studies for the corresponding complex system, however, no evidence of exocyclic coordination was observed. Instead, L and L form a stable endocyclic 1 : 1 silver(I) nitrate complex, with a higher affinity for the former ligand.
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