| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1302082 | Inorganic Chemistry Communications | 2012 | 6 Pages |
A series of LMOFs, consisting of three groups of isostructural compounds, [Ln(3-H-5-phenoxonicotinato)(ox)(H2O)2]n1 (Ln = La(1a), Pr(1b), Nd(1c), 5-Hydroxynicotinic acid = C6H5NO3, ox = C2O42 −), {[Ln(3-H-5-hydroxynicotinato)(ox)1.5(H2O)]⋅H2O}n2 (Ln = Sm(2a), Gd(2b), Tb(2c), and {[Ln(3-H-5-phenoxonicotinato)(ox)(H2O)]⋅H2O}n3 (Ln = Dy(3a), Er(3b), have been hydrothermally synthesized and structurally determined by X-ray diffraction analyses. Compounds in group 1 are constructed by mixed μ3-3-H-5-phenoxonicotinato and oxalate bridging ligands and Ln3 + ions, exhibiting a 3D covalent network with empty 1D microchannels, featuring a 3,5-connected topology symbol of {42⋅ 65⋅ 83}⋅{42⋅ 6}. Compounds in group 2 present a brick-well-liked 2D network generated by both metal ions and oxalate groups at a side-by-side way. Compounds in group 3 are isotopological to those in group 1, accompanying 1D microchannels being occupied by coordinated water molecules. Antiferromagnetic interactions between praseodymium metal centers are observed from the magnetic susceptibility of compound 1b. In addition, luminescence measurements indicate that the terbium complex 2c is a strong green luminescence emitter.
Graphical abstractEight new lanthanides metal-organic frameworks (LMOFs) [Ln(3-H-5-phenoxonicotinato)(ox)(H2O)2]n1 (Ln = La(1a), Pr(1b), Nd(1c)), {[Ln(3-H-5-hydroxynicotinato)(ox)1.5(H2O)]⋅H2O}n2 (Ln = Sm(2a), Gd(2b), Tb(2c), and {[Ln(3-H-5-phenoxonicotinato)(ox)(H2O)]⋅H2O}n3 (Ln = Dy(3a), Er(3b), have been hydrothermally synthesized and structurally determined. The study on magnetic property of complex 1b reveals antiferromagnetic interactions existing between neighboring praseodymium(III) ions and the study of luminescent property about compound 2c shows that the terbium compound is a green luminance emitter.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Reaction of Ln3 + ions with 5-Hydroxy-nicotinic acid and oxalate forms eight LMOFs. ► The 2D LMOFs (Ln = Sm/Gd/Tb) show a brick-well-liked covalent network. ► The 3D LMOFs (Ln = La/Pr/Nd/Dy/Er) hold a 3,5-connected {42⋅ 65⋅ 83}⋅{42⋅ 6} topology. ► The praseodymium complex exhibits antiferromagnetic interactions. ► The terbium compound is a strong green luminance emitter.
