No abstract

A fluorescent chemodosimeter containing a guanidiniocarbonylpyrrole and a 9-(aminomethyl)anthracene moiety has been synthesized. The sensor exhibits ratiometric fluorescence changes for SO(3)(2-) over other anions in 90% water/DMSO. The interesting ratiometric fluorescent changes for SO(3)(2-) are attributed to the fluorescence resonance energy transfer (FRET) and the SO(3)(2-) complex induced photochemical reaction.

No abstract

A series of nonlinear optical (NLO) chromophores were successfully prepared, in which pyrrole moieties were the conjugated bridge. In comparison with their analogues containing furan or thiophene groups as the bridge, these chromophores demonstrated similar or enhanced NLO effects (up to 3.3 times) and interesting optical behavior. While the acceptor groups were malononitrile (Mal), 3-phenyl-5-isoxazolone (Iso), and 1,3-diethylthiobarbituric acid (Bar), the chromophores exhibited much blue-shifted maximum absorption wavelengths (lambda max) (up to 36 nm); however, the lambda max of the chromophore containing tricyanovinyldihydrofuran (TCF) as acceptor became much longer than that of the analogue (up to 75 nm).

No abstract

By utilizing a displacement method, a macrocyclic compound 1, could report the presence of sulfide anion, with the detection limit of 7.0 × 10(-7) mol/L; moreover, no interference was observed from other anions, including SO(3)(2-), HSO(3)(-), SO(4)(2-), ClO(4)(-), I(-), Br(-), Cl(-), F(-), IO(3)(-), HPO(4)(2-), PO(4)(3-), C(2)O(4)(2-), S(2)O(3)(2-), CO(3)(2-), AcO(-), CN(-) and P(2)O(7)(4-), making compound 1 a new, highly sensitive and selective sulfide anion chemosensor.

No abstract

SummaryColumns for open-tubular (OT) capillary electrochromatography (CEC), coated with 1,4,7,10-tetraazacyclotridecane-ll,13-dione (dioxo[13laneN4) by use of the sol-gel technique, have been investigated for the first time. Dioxo[13laneN4 was reacted with 3-(2-cyclooxypropoxy)-propyltrimethoxysilane and the product was then mixed with tetraethoxysilane (TEOS) and water to form a glass matrix as a neh, vork in which the stationary phase (dioxo[13laneN4) was incorporated. In comparison with OTCEC columns prepared by the sol-gel process with TEOS only, the sol-gel-derived macrocychc dioxopolyamine columns enabled better separations of a mixture of isomeric nitrophenols and benzenediols, a mixture of isomeric aminophenols and diaminobenzenes, and a mixture of four biogenic monoamine neurotransmitters. High efficiencies (60 000-340 000 plates m -1) were achieved for isomeric benzenediols, aminophenols, nitrophenols, and diaminobenzenes. Migration time and theoretical plate number reproducibility was satisfactory; RSDwas < 2% for one column and <8.5% from column to column.