Research issue on 2D coordination networks is moving toward practical applications. Recent developments in such 2D networks include exciting advances in efficient single-crystal-to-single-crystal (SCSC) functionality. This account highlights advances in various 2D coordination networks as SCSC porous platforms for dye inclusion as an energy transfer system, template for x-ray crystal structure determination of various liquids, polymorphism materials, efficient heterogeneous catalysts, separation of o-, m-, and m-xylene, sensing via interlayer-tuning, recognition and reservoir of unstable diiodomethane, chiral recognition in SCSC mode.The key point of their utility is not only the construction of recyclable tolerant 2D networks but also channel-tuning for inclusion of targeting guest molecules. The targeting guest molecules, which are appropriate with the polarity, shape, and size of 2D pores, can, instead of simple organic solvates, be incorporated into the porous crystals in SCSC mode, thus giving rise to recyclable tolerant host-guest systems in the crystalline state.

Self-assembly of late-transition M(NO3)2 (M2+ = Co2+, Ni2+, Cu2+, and Zn2+) with a C3-symmetric tridentate donor, tri(isoquinolin-5-yl)benzene-1,3,5-tricarboxylate (L), produces single crystals with multi-channels consisting of 2-D networks G@[M(NO3)2L] (G =...

Self-assembly of Hg(ClO4)2 with a pair of C 3-symmetric chiral ligands, (1S,1′S,1″S,2R,2′R,2″R)-(benzenetricarbonyltris(azanediyl))tris(2,3-dihydro-1H-indene-2,1-diyl)trinicotinate (s,r-L) and (1R,1′R,1″R,2S,2′S,2″S)-(benzenetricarbonyltris(azanediyl))tris(2,3-dihydro-1H-indene-2,1-diyl)trinicotinate (r,s-L), produces a pair of chiral cages C4H8O2@[(Hg2 II)3(ClO4)6(s,r-L)2(H2O)7](C4H8O2)7 and C4H8O2@[(Hg2 II)3(ClO4)6(r,s-L)2(H2O)7](C4H8O2)7, respectively, via straightforward formation of the reduced Hg2 II species with an inner cavity in which a single dioxane molecule is nestled. The pair of chiral cages are transformed into their downsized pair of cages, [Hg3 II(ClO4)6(s,r-L)2] and [Hg3 II(ClO4)6(r,s-L)2], respectively, in the presence of hydrochloric acid. The original chiral cages are more effective than the corresponding downsized cages for enantiorecognition of chiral 3,4-dihydroxyphenylalanine (DOPA) via the shifts of electrochemical oxidation potentials observed by linear sweep voltammetry (LSV) technique. Furthermore, the photoluminescence (PL) spectral shifts show that the downsized chiral cages significantly recognize chiral DOPA.

Most mechanical systems are now operating consistently and getting faster due to the development of automation systems. Peoples' dependence on machines have increased as when problems occur within the mechanical system, personal injury and production loss may come as a result, as most of the mechanical system's malfunctions are caused by the failure of the rotational bearing. What we need now is a maintenance system that can warn us when it detects abnormal conditions before significant damage occurs to the bearing. In this study, we have developed an acoustic emissions sensor that can figure if the bearing works under the normal condition. With this acoustic emissions sensor, we can inspect the bearing for defects by using the Heterodyne technique, which converts the ultrasound signal into audio, as a signal conditioning process.

Self-assembly of ZnCl2 with a new C2-symmetric bidentate N-donor ligand gives rise to stable crystals consisting of 46-membered metallacyclodimers, [ZnCl2L]2·5C4H8O. The tetrahydrofuran solvates of the single crystals are replaced by...