| Three novel NLO materials: bis{lcub}4-[2-(4-pyridyl)ethenyl]benzoato{rcub}-zinc (II) and -cadmium(II) with 8-fold diamondoid network structures along with octupolar [Cd3(□3-OH)(4-[2-(4-pyridyl)ethenyl]benzoato) 3(py)6](ClO4)2, have been synthesized under hydro(solvo)thermal conditions and exhibit powder second harmonic generation efficiencies comparable to that of technologically important lithium niobate.; One-dimensional lanthanide coordination polymers with the formula Ln(isonicotinate) 3(H2O)2 (Ln = Ce, Pr, Nd, Sm, Eu, and Tb, 1a–1f) were synthesized under hydro(solvo)thermal conditions. Single crystal and powder X-ray diffraction studies indicate that these lanthanide coordination polymers adopt two different structures. While Ce(III), Pr(III), and Nd(III) complexes adopt a chain structure with alternating Ln-(carboxylate) 2-Ln and Ln-(carboxylate)4-Ln linkages, Sm(III), Eu(III), and Tb(III) complexes have a doubly carboxylate-bridged infinite chain structure with one chelating carboxylate group on each metal center. Tb(isonicotinate) 3(H2O)2 is highly emissive at room temperature with a quantum yield of ∼90%.; A series of well-defined optically active 1,1′-binaphthyl-based oligomers, linked through their 6,6′-positions that range from tetranaphthol to decanaphthol, have been synthesized. A combination of X-ray structural and CD studies suggests that these oligonaphthyls adopt zig-zag, but not helical conformation. As the chain length increases, these oligomers exhibit the enhanced fluorescence, which can be quenched very efficiently by chiral 1,2-diaminocyclohexane. Most interestingly, the fluorescence of hexanaphthol can be quenched enantioselectively by 1,2-diaminocyclohexane with a selectivity of 1.24. The present work thus demonstrates the potential of constructing chiral sensory materials based on well-defined enantiopure oligonaphthols.; Optically active dendrimers containing a 1,1′-binaphthyl core and its oligomer core were synthesized. The chiral optical properties were also studied by UV, fluorescence, optical rotation and CD spectra. |
