Two 3d-4f heterometallic coordination polymers {[Ln(PDA)3Mn1.5(H2O)3].3.25H2O}infinity with 1D channels were synthesized under hydrothermal conditions (PDA = pyridine-2,6-dicarboxylic acid; Ln = Eu (1); Ln = Tb (2)). The emission intensities of 1 and 2 increased significantly upon addition of Zn2+, while the introduction of other metal ions caused the intensity to be either unchanged or weakened. The case implies that 1 and 2 may be used as luminescent probes of Zn2+.

A nanotubular 3D heterometallic zeolitic polymer, {[Yb(PDA)3Mn1.5(H2O)3].1.5H2O}n (2), was designed and synthesized by simply tuning the amount of coordinated water on the Mn ion in the molecular ladder polymer {[Yb(PDA)3Mn1.5(H2O)6].6H2O}n (1). 1 and 2 were structurally and magnetically characterized. The water molecules capsulated within the nanotube were arrayed into an unprecedented "water" pipe. The robust 2 retained intact networks after the removal of guest water trapped in the nanotubes and even after methanol replaced guest water.

Interest in porous metal-coordination polymers that are constructed by self-assembly processes has mushroomed recently, [1] because of their use in, for example, redox catalysis, cathodic electrolysis, ion exchange, adsorption, separation, sensors, and molecular recognition. [2][3][4][5] However, much of the work has so far focused on coordination polymers containing transition metals, [2,6] while rare-earth metal compounds have received much less attention. [7] To date, no systematic investigation of zeolite-type structures containing metal atoms from the lanthanide series along with transitionmetal atoms has been documented. Furthermore, the pores or channels reported were mainly formed through either hydrogen bonding, [2b] or p-p packing, [1b] and only in a few cases were they formed through metal-ligand bonding alone.On the other hand, the construction of mesoporous metal--organic polymers suffers from difficulties in the control of the polymer dimensionality. Although ligands can be designed to create a large hole, the resulting coordination polymers are often plagued by lattice interpenetration, [8] or framework breakdown on removal of a guest molecule. [9] In addition, the variable and versatile coordination behavior of 4f-metal ions limits their selective introduction into highly ordered structures.Herein we report the syntheses and structures of three coordination polymers formed through hydrothermal synthesis: [{[Ln(dipic) 3 Mn 1.5 (H 2 O) 3 ]·n H 2 O} ¥ ], H 2 dipic = pyridine-2,6-dicarboxylic acid; Ln = Pr, n = 2 (1); Ln = Gd, n = 3.5 (2); Ln = Er, n = 3 (3). These compounds have the relatively large nanometer-sized tubes associated with selfassembly processes directed by metal-ligand coordination only, and the framework remains intact on removing water molecules trapped in the nanotube.The three compounds are stable in air and are insoluble in common solvents. Single-crystal X-ray diffraction analyses were performed on selected crystal of these compounds. The crystal structures of the polymers are isomorphous, comprising a 3D framework containing nine-coordinate lanthanidemetal centers and six-coordinate transition-metal centers, which results in a nanotubelike structure (Figure 1). All three polymers crystallized in the hexagonal crystal system, space group P6/mcc. The crystal structure is built up of two distinct types of building blocks, Ln(dipic) 3 and MnO 4 (H 2 O) 2 (Figure 2). The Ln atom is located at the intersection of a threefold and a twofold axis and is coordinated by three tridentate (ONO) dipic anions; for which each carboxy group coordinates through one oxygen atom. Three N atoms and six O atoms complete the coordination sphere of the Ln 3+ center, which conforms most closely to a tricapped trigonal prism. The coordination geometry around Mn 2+ center is a slightly distorted octahedron, the equatorial plane of which comprises four O atoms from the carboxy groups of the dipic molecules that are chelated to four neighboring Ln 3+ centers; two water molecules occupy the remaining apic...

A zeolite-like microporous tetrazole-based metal-organic framework (MOF) with 24 nuclear zinc cages was synthesized and characterized. It exhibits high CO(2) adsorption capacity up to 35.6 wt % (8.09 mmol/g) and excellent CO(2)/CH(4) selectivity at 273 K/1 bar, being among the highest values known to date. Theoretical calculations based on simulated annealing techniques and periodic DFT revealed that CO(2) is predominantly located around the inner surface of the cages through multipoint interactions, in particular, around the aromatic tetrazole rings. Importantly, it is the first time that multipoint interactions between CO(2) molecules and frameworks resulting in high CO(2) uptake are observed.

The environmental pollution has become a serious issue because the pollutants can cause permanent damage to the DNA, nervous system, and circulating system, resulting in various incurable diseases, such as organ failure, malformation, angiocardiopathy, and cancer. The effective detection of environmental pollutants is urgently needed to keep them far away from daily life. Among the reported pollutant sensors, luminescent metal–organic frameworks (LMOFs) with tunable structures have attracted remarkable attention to detect the pollutants because of their excellent selectivity, sensitivity, and recyclability. Although lots of metal–organic framework (MOF)‐based luminescent sensors have been summarized and discussed in previous reviews, the detection of environmental pollutants, especially radioactive ions and heavy metal ions, still have not been systematically presented. Here, the sensing mechanisms and construction principles of luminescent MOFs are discussed, and the state‐of‐the‐art MOF‐based luminescent sensors of environmental pollutants, including pesticides, antibiotics, explosives, VOCs, toxic gas, toxic small molecules, radioactive ions, and heavy metal ions are highlighted. This comprehensive review may further guide the development of luminescent MOFs and promote their practical applications for sensing environmental pollutants.