Coordination Polymers of M2L2 Macrocycles and M3L2 Podands Containing Tris (pyridyl) Tripodal Amide: Anion Bridging, Ag⋅⋅⋅Ag Interactions and Solid‐State Luminescence

Abstract

AbstractThe tris‐pyridyl‐tripodal amide ligand (L), which is synthesized by the condensation of tris(2‐aminoethyl)amine (tren) and isonicotinic acid, was shown to form coordination polymers (CPs) with AgX (X= CF3SO3−, BF4− and ClO4−), HgX2 (X= Cl− and Br−) and CdI2. The crystal structure analysis of {[Ag3L2(CF3SO3)3].MeOH}n, 1, {[AgL](BF4).2H2O}n, 2, {[AgL](ClO4).MeOH.H2O}n, 3, {[Hg2Cl4L].H2O}n, 4, [Hg3Br6L2], 5, [Cd2I4L2.(H2O)2], 6, reveals that they are constituted by M2L2 macrocycles and M3L2 podand structures. The complexes 1–4 were found to form 1D‐coordination polymers by linking M2L2 units via anions. Complexes 5 and 6 found to contain capsule (podand) like structure with M3L2 and M2L2 H2O compositions in 5 and 6 respectively. The complex 1 contains Ag⋅⋅⋅Ag interactions within the Ag2L2 macrocycle whereas the complex 2 and 3 contains such argentophilic interactions between the macrocycles. These 1D‐CPs linked further via amide‐to‐amide and amide‐to‐water hydrogen bonding to form higher dimensional networks. In these complexes the ligand (L) found to exhibit conformational variations which defines the overall network geometries. The ligand (L) and the coordination complexes 1–6 were found to exhibit intense luminescence emissions upon exciting at a wavelength of 310 nm.