Showing papers by "Chunying Duan published in 2008"
TL;DR: In this paper, a new Cu2+ compound Cu−NB was synthesized as a highly selective fluorescence chemosensor for the detection of Hg2+ in aqueous media through a displacement "turn-on" signaling strategy.
Abstract: A new Cu2+ compound Cu−NB, (where H2NB is bis(2-hydroxyl-naphthalene-carboxaldehyde) benzil dihydrazone) was synthesized as a highly selective fluorescence chemosensor for the detection of Hg2+ in aqueous media through a displacement “turn-on” signaling strategy. Whereas the coordination of Cu2+ resulted in a considerable quenching of the typical luminescence of the naphthol rings in Cu−NB, the addition of Hg2+ ion led to a dramatic increase in the emission intensity of Cu−NB at about 530 nm (excitation at 430 nm). The competitive fluorescent experiments showed that alkali, alkaline earth metal ions, the group 12 metals Zn2+, Cd2+, the first-row transition-metal ions such as Mn2+, Fe2+, Co2+, and Ni2+, as well as Pb2+ could not inhibit the Hg2+-binding fluorescent enhancement. It is postulated that the existence of Cu2+ in the luminescent probe Cu−NB could turn away the interferences of other metal cations from Hg2+ detection. The optical responses of the free ligand upon addition of Cu2+ ion, and of the ...
107 citations
TL;DR: A di-mixed-valence molecular square with two extra mobile electrons (or holes) occupying the opposite corners is achieved via self-assembly as a pure phase with remarkable stability for molecular expression of quantum cellular automata (QCA).
65 citations
TL;DR: In this paper, the assembly of racemic molecular clipsSS- and RR- 1,1'-bis(1,2,4-triazol-1-yl)ethyl)ferrocene (FcTz) into coordination polymers has been studied systematically.
Abstract: The assembly of racemic molecular clipsSS- and RR- 1,1'-bis(1-(1,2,4-triazol-1-yl)ethyl)ferrocene (FcTz) into coordination polymers has been studied systematically. Stereoselective homochiral association of Zn(CH3COO)2·4 H2O leads to the formation of one-dimensional helical chains having a right handed enantiomer 1 and a left-handed enantiomer 1′ viaself-assembly. The CD spectra of crystals of 1 and 1′ exhibit the opposite Cotton responses and suggest that two enantiomers of the molecular clips are resolved by the metal-induced crystallization. On the other hand, the meso type association of CdI2 results in the formation of centro-symmetric two-dimensional sheets. It is shown that the product of the homochiral association is predominately formed when the metal center is tetrahedrally coordinated, and that of the meso-association is generated at the time the metal centers is sited in a mirror symmetric tetragonal pyramidal geometry. The weak but significant intermolecular interactions are also found to be essential in controlling the homochiral aggregation of these helical polymers and achiral sheets.
4 citations