Cationic Metal–Organic Frameworks Synthesized from Cyclotetraphosphazene Linkers with Flexible Tentacles

Abstract

Metal−organic frameworks (MOFs) based on group 12 metals, namely, [Zn 2 (O 3 PyCP)Cl 4 ] (Zn-O 3 PyCp), [Cd(O 3 PyCP)(NO 3 ) 2 ].H 2 O (Cd-O 3 PyCp), and [Hg(O 3 PyCP)Cl 2 ] (Hg-O 3 PyCp), were synthesized using a novel flexible molecular building block, octakis(3-pyridyloxy)cyclotetraphosphazene (O 3 PyCP), and group 12 metal salts (ZnCl 2 , Cd-(NO 3 ) 2 .6H 2 O, and HgCl 2 ). The crystals of each of the cationic frameworks were structurally characterized by single-crystal Xray diffraction, Fourier transform infrared, and thermogravimetric analysis. Because of the flexibility of the O 3 PyCP building block, we were able to observe three distinct cationic frameworks with group 12 metal ions. We performed the atomically detailed simulations to compute H 2 adsorption isotherms of the resulting frameworks at a pressure range of 0−1 bar at 77 K. Zn-O 3 PyCp exhibits the highest H 2 uptake capacity (58.42 cm 3 STP/g).

Ag(I) and Hg(II) Coordination Polymers Decorated from Fully Benzimidazole Substituted Cyclotriphosphazene Ligand and Adsorption Behaviour Against Methylene Blue

“…Therefore, it is possible to design materials with special properties such as biological active molecules [15][16][17][18][19], sensor molecules [20,21], liquid crystal molecules [22,23]. Also, N-heterocyclic-based cyclophosphazene ligands supply a rich coordination chemistry via multiple N-donor atoms [24][25][26][27][28]. In this work, N-heterocyclic multidentate ligand as a hexapodal cyclotriphosphazene linker, L, was successfully synthesized and characterised.…”