Cadmium(ii) carboxyphosphonates based on mixed ligands: syntheses, crystal structures and recognition properties toward amino acids. Issue 95 (27th September 2016)

• Record Type: Journal Article
• Authors: Zhao, Zhou; Yang, Dan; Xing, Bo; Ma, Chao; Sun, Zhen-Gang; Zhu, Yan-Yu; Li, Huan-Yu; Li, Jing
• Is Part Of: RSC advances. Volume 6:Issue 95(2016)
• Page Start: 92175
• Page End: 92185
• Publication Date: 2016-09-27
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra20434a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Three novel cadmium(ii ) carboxyphosphonates have been hydrothermally synthesized. The luminescence properties of compounds1–3 have been investigated. Meanwhile, the excellent abilities of compounds2 and3 for selective recognition of tryptophan (Trp) have been demonstrated. Abstract : Three novel cadmium(ii ) carboxyphosphonates with three-dimensional (3D) frameworks and supramolecular structures, namely, Cd3 [(L)2 (1, 10-phen)1.5 ]·H2 O (1 ), Cd[(L′)(H2 biim)] (2 ), and Cd[(L′)(H2 biim)(H2 O)]·H2 O (3 ) (L = OOC–C6 H4 –CH2 PO3, L′ = OOC–C6 H4 –CH2 PO2 (OC2 H5 ), 1, 10-phen = 1, 10-phenanthroline, H2 biim = 2, 2′-biimidazole), were synthesized under hydrothermal conditions and were structurally characterized. For compound1, the Cd(1)O6, Cd(2)O4 N2, Cd(3)O2 N2, 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 L 3− anions, giving rise to a 3D framework structure. Compound2 adopted a 3D supramolecular structure. The interconnection of two Cd(1)O4 N2 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 compound3, the Cd(1)O4 N2 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 compounds1–3 were investigated. Meanwhile, the excellent abilities of compounds2 and3 for the selective recognition of tryptophan (Trp) were demonstrated.