Polymeric structures of a pair of linear, dicarboxylate (tpy)2Ru2+ analogues

The preparation and solid-state structures of homoleptic Ru(II) complexes based on the ligands 4′-(4-carboxyphenyl)tpy (L1) (where tpy = 2,2′:6′,2″-terpyridine) and 4′-(4-carboxyphenyl)-4,4″-di-(tert-butyl)tpy (L2) are described. Both complexes are found to possess polymeric solid-state structures due to hydrogen-bonding interactions. The first complex, [Ru(L1)2]2+, exhibits a more closely-packed structure relative to that of [Ru(L2)2]2+, which was found to have a porous solid-state structure due to the steric bulk of the tert-butyl groups.