Eight coordination compounds based on a reduced Schiff base tetraaminodiphenol macrocyclic ligand

• Eight new compounds based on a macrocyclic ligand have been synthesized.
• These compounds show fascinating 1D, 2D and 3D supramolecular structures.
• These compounds display intense emissions.

Eight new compounds, namely, [Cu2(L)]·2NO3·H2O (1), [Cu(ox)2]·0.5(H6L)·3H2O (2), [Zn(L)0.5(nds)0.5] (3), [Zn4(L)2(m-bdc)2]·0.5H2O (4), [Cd(L)0.5(ox)0.5(H2O)]·MeOH·1.25H2O (5), [Cd(L)0.5(H2O)3]·0.5(p-bdc)·1.5H2O (6), [Cd2(L)(btec)0.5(H2O)4]·2.5MeOH·H2O (7) and [Ni2(L)(btec)0.5(H2O)]·MeOH·1.5H2O (8) (H2L = 10,21-dimethyl-3,6,14,17-tetraazatricyclo [17.3.18,12]tetracosa-1(23),8,10,12(24),19,21-hexaene-23,24-diolate, ox = oxalate, nds = 1,5-naphthalenedisulfonate, m-bdc = 1,3-benzenedicarboxylate, p-bdc = 1,4-benzenedicarboxylate and btec = 1,2,4,5-benzenetetracarboxylate), have been synthesized. In compound 1, the L ligand coordinates with two Cu(II) atoms to form a [Cu2L]2+ unit. In compound 2, two ox anions chelate to one Cu(II) atom to form a [Cu(ox)2]2− unit. The (H6L)4+ acts as a counter ion. The whole structures of 1 and 2 feature three-dimensional (3D) supramolecular architectures connected by weak Cu⋯O and hydrogen-bonding interactions, respectively. In compounds 3–5, the [M2L]2+ cations are bridged by nds, m-bdc and ox anions to form chains, respectively. The chains of 3 and 4 are further linked by hydrogen-bonding interactions into 2D and 3D supramolecular architectures, respectively. In compound 6, the macrocyclic L anion coordinates to two Cd(II) atoms to form a [Cd2L]2+ cation. The final structure of 6 exhibits a 3D supramolecular architecture linked by hydrogen bonds. In compound 7, Cd(II) atoms are linked by L anions to form two types of [Cd2L]2+ cations. One type of [Cd2L]2+ cations are bridged by btec anions to generate a polymeric anion chain, whereas the other [Cd2L]2+ cations are free. Further, the polymeric anion chains and the [Cd2L]2+ cations are linked by hydrogen bonds to generate a 2D supramolecular layer. In compound 8, btec anion bridges the [Ni2L]2+ cations to yield a 2D layer. Thermogravimetric analyses (TGA) for the compounds 1–8 have been investigated. In addition, the magnetic property for 1 and the luminescent properties for compounds 3–7 have also been studied.

Eight new coordination compounds based on reduced Schiff base tetrazamacrocycle ligand have been prepared. These compounds show fascinating 1D, 2D and 3D supramolecular structures. Compound 1 shows the existence of an antiferromagnetic interactions between the Cu(II) ions. Compounds 3–7 display intense emissions.Figure optionsDownload as PowerPoint slide