Hexachlorocyclotriphosphazene is one of the most representative phosphazene compounds which have been proved to have broad application prospects in many fields. However, it is an emerging research perspective to combine cyclotriphosphazene-derived polycarboxylic acid compounds with lanthanides for the construction of Tb-DPCP metal−organic f r a m e w o r k ( M O F ) m a t e r i a l s . H e r e i n , a T b -D P 1), was successfully prepared via the reaction of H 12 HDPCP [hexa(4-carboxyphenoxy) cyclotriphosphazene] and Tb(NO 3 ) 3 •6H 2 O under the solvothermal condition. Through fluorescence sensing experiments, it was found that both nitrophenols and chlorophenols could cause the fluorescence quenching of compound 1. At the same time, the compound also exhibited nice trace detection ability for small-molecule drugs (moxifloxacin hydrochloride, balsalazide disodium, and colchicine); the limits of detection were all lower than 0.2 μM. These experimental results fully demonstrated the potential application value of 1 as a multifunctional fluorescent sensor.

Three new triazine compounds [Co 1.5 (H 3 TDPAT)-(H 2 O) 3 ]•6H 2 O (1), [Co 2 (TCPT)(μ 2 -H 2 O) 2 ]•OH (2), and [Ni 3 (TCPT)]•3OH (3) were designed and synthesized via the reaction of the symmetrical triazine ligand connected by C−N−C and C−O−C bonds with triazine poly(carboxylic acid)s ligands as the side arms:H 6 TDPAT (H 6 TDPAT = 2,4,6-tris(3,5-dicarboxylphenylamino)-1,3,5triazine) and H 3 TCPT (H 3 TCPT = 2,4,6-tris(4-carboxyphenoxy)-1,3,5-triazine) as well as the corresponding metal salts under the solvothermal condition. Three triazine polycarboxylate frameworks were characterized by elemental analysis, infrared spectroscopy, ultraviolet spectroscopy, thermogravimetric analysis, X-ray powder diffraction, and solid fluorescent spectra in detail. The structural analysis results showed that the three-dimensional porous cage framework of compound 1 was constructed by three different polyhedral cages connected with [Co(COO) 4 (H 2 O) 2 ] building blocks. One of the compounds, 2, is formed by twin propeller Co 2 (μ 2 -H 2 O)(COO) 3 building blocks connecting two-dimensional layers and the intermolecular π−π interactions involved the triazine rings between the layers. While the structure of compound 3 is similar to that of 2, assembly is by Ni(COO) 3 building blocks and adjacent layers of the face-to-face π−π interaction between the triazine rings. In order to explore functional properties, the catalytic reduction of p-nitrophenol (PNP) of compounds 1−3 was investigated. They exhibit excellent catalytic activity of more than 95% for reduction of PNP with a dose of 2.5 mg of the compounds.