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Second-sphere coordination refers to any intermolecular interactions with the ligands directly bound to the primary coordination sphere of a metal ion. Four supramolecular complexes, 0.5[L·2H]2+·0.5[MCl4]2−·[CH3OH]·0.5[CH2Cl2] (M = Co, crystal1; M = Mn, crystal2), 0.5[L·2H]2+·0.5[ZnBr4]2−·[CH3OH]·0.5[CH2Cl2] (crystal3), and 0.5[L·2H]2+·0.5[Cu2Br4]2−·H2O (crystal4), based on naphthalene-based ligand N,N,N′,N′-tetra-p-methylnaphthyl-ethanediamine (L), have been synthesized. X-ray analysis reveals that1–3are isostructural, in which the methanol molecules are bridges, connecting the protonatedLand metal chloride anions via N–H⋯O and O–H⋯Cl (Br) interactions to construct the host framework, and forming X-shaped cavity accessible for the inclusion of weakly polar guest molecules of dichloromethane. Dichloromethane is connected with the host framework through van der Waals forces. In4, a dinuclear anion [Cu2Br4]2−is connected with the ligand through N–H⋯Br interactions, in which the water molecules are accommodated between chains formed by the ligand and [Cu2Br4]2−. Structure stability, thermal analysis, and photoluminescent properties were studied for1–4. X-shaped host framework formed by second-sphere coordination strategy. [ABSTRACT FROM AUTHOR]

Two new supramolecular compounds, [(H4aobtc)0.5(H2O)0.5] (1) and [(H3aobtc)(H2bipy)0.5] (2) (H4aobtc = azoxybenzene-3,3′,4,4′-tetracarboxylic acid), were synthesized and characterized. Compound 1 has a complicated three-dimensional hydrogen bonding network with 4-connected {33.62.7} topology. Compound 2 also shows a three-dimensional supramolecular motif with hexagonal topology. The result indicated that hydrogen bonding interactions from different molecular synthons take important roles in the formation of supramolecular architectures. [ABSTRACT FROM PUBLISHER]

9a-(3-Azabicyclo[3,3,1]nonanyl)-2'-cyclopentyl-2'-hydroxy-2'-phenylacetate (1) was synthesized and its enantiomers were obtained by the optical resolution of racemates with the chiral host N- p -toluenesulfonylglutamic acid. Optical pure 1 was also effective diastereoselective synthesized using benzaldehye as steric hindrance agent from the chiral starting material, ( S ) or ( R )-mandelic acid. The structure of the title compound was first elucidated by X-ray analysis. [ABSTRACT FROM AUTHOR]