Issue 95, 2016, Issue in Progress

Cadmium(ii) carboxyphosphonates based on mixed ligands: syntheses, crystal structures and recognition properties toward amino acids

Abstract

Three novel cadmium(II) carboxyphosphonates with three-dimensional (3D) frameworks and supramolecular structures, namely, Cd3[(L)2(1,10-phen)1.5]·H2O (1), Cd[(L′)(H2biim)] (2), and Cd[(L′)(H2biim)(H2O)]·H2O (3) (L = OOC–C6H4–CH2PO3, L′ = OOC–C6H4–CH2PO2(OC2H5), 1,10-phen = 1,10-phenanthroline, H2biim = 2,2′-biimidazole), were synthesized under hydrothermal conditions and were structurally characterized. For compound 1, the Cd(1)O6, Cd(2)O4N2, Cd(3)O2N2, Cd(4)O4 and CPO3 polyhedra were interconnected in a one-dimensional (1D) chain along the b-axis via corner- and edge-sharing. The adjacent chains were connected with each other by sharing the L3− anions, giving rise to a 3D framework structure. Compound 2 adopted a 3D supramolecular structure. The interconnection of two Cd(1)O4N2 polyhedra and two CPO3 tetrahedra via corner-sharing formed a structure unit, with such units further connected in the bc-plane by sharing the L′2− anions to exhibit a 2D layer, and then the neighboring layers were further assembled into a 3D supramolecular structure by π–π stacking interactions. In compound 3, the Cd(1)O4N2 and CPO3 polyhedra were interconnected to form a unit, and then the interconnection of multi-units were assembled into two kinds of 1D chains, whereby chains and other chains are further connected by π–π stacking interactions to present a 3D supramolecular structure. The luminescence properties of compounds 1–3 were investigated. Meanwhile, the excellent abilities of compounds 2 and 3 for the selective recognition of tryptophan (Trp) were demonstrated.

Graphical abstract: Cadmium(ii) carboxyphosphonates based on mixed ligands: syntheses, crystal structures and recognition properties toward amino acids

Supplementary files

Article information

Article type
Paper
Submitted
13 Aug 2016
Accepted
12 Sep 2016
First published
12 Sep 2016

RSC Adv., 2016,6, 92175-92185

Cadmium(II) carboxyphosphonates based on mixed ligands: syntheses, crystal structures and recognition properties toward amino acids

Z. Zhao, D. Yang, B. Xing, C. Ma, Z. Sun, Y. Zhu, H. Li and J. Li, RSC Adv., 2016, 6, 92175 DOI: 10.1039/C6RA20434A

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