Compartment compounds as secondary building units for the preparation of 3d–4f coordination polymers: Preparation, structures, and properties of [NiLn(L)(NO3)2(4-pyp)(EtOH)] (Ln = Nd, Eu; H2L = 1,3-bis((3-methoxysalicylidene)amino)propane; 4-Hpyp = 4-pyri

This paper describes the preparation of three compartment compounds and their use as secondary building units (SUBs) for the synthesis of Ni–Nd and Ni–Eu coordination polymers. A tetranuclear 3d–4f compartment compound, [NiNd(L)(NO3)2(μ-NO3)(H2O)(CH3CN)]2(H2O)2 (1) was prepared from [Ni(L)] (H2L = 1,3-bis((3-methoxysalicylidene)amino)propane) and Nd(NO3)3·5(H2O) in acetonitrile under microwave-heating conditions. In addition, two dinuclear 3d–4f compartment compounds, [NiLn(L)(NO3)(CH3CN)(H2O)4](NO3)2(H2O) (Ln = Nd (2), Eu (3)), were synthesized at room temperature by stirring an acetonitrile solution containing [Ni(L)] and Ln(NO3)3·n(H2O). Compounds 2 and 3 were subsequently treated with 4-pyridinepropionic acid (4-Hpyp) to create the corresponding one-dimensional 3d–4f coordination polymers under microwave-heating conditions: [NiLn(L)(NO3)2(4-pyp)(EtOH)] (Ln = Nd (4), Eu (5)). The compartment ligand (L) in compounds 3 and 5 appears to exhibit quenching effects on the emission of the Eu3+ ions in both compounds.

Graphical abstractThis paper describes the preparation of three compartment compounds and their use as secondary building units for the synthesis of 1D Ni–Nd and Ni–Eu coordination polymers. The compartment ligand (L) in compounds containing the Eu3+ ion appears to exhibit quenching effects.Figure optionsDownload full-size imageDownload as PowerPoint slide