A series of tetradentate pyridyltriazoles, separated by aromatic spacers, have been synthesized to study their coordination with copper(II). The ortho and meta xylylenebis(pyridyltriazole) gave dimeric macrocycles of type  [Cu2L2]4+ while the para isomer gave a triple helical or 1-D polymer with Cu(II). Even though the cavity size of macrocycle obtained from meta xylylenebis(pyridyltriazole) ligand is appropriate for accommodating the 1,4-diazabicyclo[2.2.2]octane (dabco) as a guest, the macrocycle underwent rearrangement in the presence of dabco giving a trimer [Cu3L3(�-CO3)]4+ byreaction with atmospheric CO2. The incorporation of dabco molecule inside the macrocycle was, however, possible by increasing the distance of aromatic spacer using naphthalenyl linker.

Metallosupramolecular assembly of �click� ligands with copper(II) and their interactions with bidentate guests

246th National Meeting (2013)

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