Four coordination polymers constructed by a novel octacarboxylate functionalized calix[4]arene ligand: syntheses, structures, and photoluminescence property

Abstract

Four novel coordination polymers, [(CH₃)₂NH₂][Zn₃(HL)(H₂O)₂]·4H₂O (1), [Co₄(L)(DMF)₂(H₂O)₈]·6H₂O (2), [Ni₄(L)(DMF)₂(H₂O)₈]·6H₂O (3) and [(CH₃)₂NH₂][Mn₃(HL)(DMF)(H₂O)₆]·6H₂O (4) (H₈L = 2,8,14,20-tetra-methyl-4,6,10,12,16,18,22,24-octa-carboxymethoxy-calix[4]arene and DMF = N,N-dimethylformamide) have been synthesized. Their structures have been confirmed and further characterized by relative physical methods. Compound 1 reveals a 2D double layer. Compounds 2 and 3 are isomorphous, and demonstrate identical 3D (3,6)-connecting nets with (4²·6)(4⁴·6²·8⁸·10) topologies. Compound 4 features a 3D binodal 5-connected (4⁶·6⁴)(4⁶·6⁴) framework. The UV-vis spectra of compounds 1–4 have been explored. The solid-state luminescence of compound 1 and its fluorescence property in various suspensions has also been investigated at room temperature. Moreover, the luminescence sensing properties of 1 for nitroaromatic compounds have been studied in detail.