To systematically explore the higher-dimensional network structures with mixed connectivity, a series of two-dimensional (2D) and three-dimensional (3D) metal-organic frameworks (MOFs) with unusual (3,6)-connected net topologies are presented. These crystalline materials include [{[Mn(btza)2(H2O)2].2 H2O}n] (1), [{[Zn(btza)2(H2O)2].2 H2O}n] (2), [{[Cu(btza)2].H2O}n] (3), and [{[Cd(btza)2].3 H2O}n] (4), which have been successfully assembled through a predesigned three-connected organic component bis(1,2,4-triazol-1-yl)acetate (btza) with a variety of octahedral metal cores based on the modular synthetic methodology. The topological paradigms shown in this work cover the 2D CdCl2, 3D (4(2).6)2(4(4).6(2).8(7).10(2)), and pyrite (pyr) types. That is, when properly treated with the familiar first-row divalent metal ions, btza may perfectly furnish the coordination spheres for effective connectivity to result in diverse (3,6)-connected nets. Beyond this, a detailed analysis of network topology for all known 3D (3,6)-connected frameworks in both inorganic and inorganic-organic hybrid materials is described. Specific network connectivity of these MOFs indicates that the metal centers represent the most significant and alterable factor in structural assembly, although they show reliable and similar geometries. In this context, the combination of the distinct d10 AgI ion with btza in different solvents affords two isomorphous MOFs [{[Ag(btza)].glycol}n] (5) and [{[Ag(btza)]CH3OH}n] (6) with a binodal 4-connected 3D SrAl2 (sra) topology. The network structures of MOFs 1-3 and 5 turn out to be more complicated and interesting if one considers the hydrogen bonding between the host coordination frameworks and the intercalated solvent molecules. Furthermore, the role of the included solvents in the generation and stabilization of MOFs 1-6 is also investigated.

A red-emitting layer constructed from {Eu2Na(CH3COO)2} chains and 4,4′-(pyridine-2,6-diyl)dibenzolate linkers exhibits luminescent discriminations for three nitrofuran antibiotics and toxic Cr2O72− and MnO4− anions.

A novel 3D lead(II) metal-organic framework {Pb 4 (Bdc) 3 -(m 4 -O)(H 2 O)} n (1) (H 2 Bdc = isophthalic acid) with octanuclear [Pb 8 (Bdc) 6 (m 4 -O) 2 (H 2 O) 2 ] as secondary building units (SBUs) has been obtained and fully characterized by single crystal X-ray diffraction, IR, elemental analysis, TG-DTA and fluorescent spectra. XRD results indicate octanuclear lead(II) SBU contains two inversely related [Pb 4 (m 4 -O)] cores and is extended topologically into an infinite eight-connected bcu-type network via twelve Bdc ligands linking eight neighboring SBUs. At room temperature, 1 in the solid-state exhibits strong emission peak at 424 nm originated from the LMCT between delocalized p bonds of Bdc carboxylate groups and p orbitals of lead(II) centers.

The first 2D aggregate, {[Cd 3 (l 3 -ade) 2 (ap) 2 (H 2 O) 2 ] . 1.5H 2 O} n (1) (where adeH = adenine; H 2 ap = adipic acid), with trinuclear Cd(II) as secondary building units, has been successfully synthesized, the compound shows scarce coordination modes (tridentate l 3 -N3,N7,N9 for ade and hexadentate g 1 :g 2 :g 2 :g 1 for flexible ap) and a novel crystal packing arrangement, exhibiting strong fluorescent emission properties.

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A Co-doped FeNi carbonate hydroxide nanosheet array supported on nickel foam served as an efficient oxygen evolution electrocatalyst with a high activity and excellent stability.

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