Synthesis, Structure, and Characterization of Emissive Neutral Dinuclear CuI Complexes with a Tetraphosphane Bridging Ligand

Abstract

A series of new dinuclear copper complexes with a tetraphosphane bridging ligand, [{(pz 4 B)Cu} 2 (μ-tpbz)] (1), [{(pz 2 BH 2 )Cu} 2 (μ-tpbz)] (2), and [{(tz 2 BH 2 )Cu} 2 (μ-tpbz)] (3) [tpbz = 1,2,4,5-tetrakis(diphenylphosphanyl)benzene, pz 4 B = tetrakis(pyrazol-1-yl)borate, pz 2 BH 2 = bis(pyrazol-1-yl)borohydrate, and tz 2 BH 2 = bis(1,2,4-triazol-1-yl)borohydrate], have been synthesized and structurally characterized. The Cu I atoms in these complexes are four-coordinate and adopt a tetrahedral coordination geometry. In each complex, the copper centers are bridged by a tpbz ligand and each Cu I is further terminally chelated by a borate diimine anion. The central phenylene ring and the phosphine atoms of the tpbz ligand are essentially planar. The two Cu I atoms in each molecule are located above

Use of short chain alkyl imidazolium ionic liquids for on‐line stacking and sweeping of methotrexate, flinic acid and folic acid: Their application to biological fluids

“…The LOQs and LODs were calculated using the following equations: LOQ = 10 S a / b and LOD = 3.3 S a / b , where S a is the standard deviation of the intercept of the calibration curve and b is the slope of the calibration curve. The obtained LODs at the low ng/mL level are in agreement with others achieved by electrophoretic on‐line preconcentration modes . Furthermore, no significant differences were found between the calibration graphs performed in fresh urine or plasma and frozen and thawed samples (samples conserved during two weeks in the freezer at –18°C and were lastly unfrozen the same day of the analysis).…”

Efficient sample clean‐up and online preconcentration for sensitive determination of melamine in milk samples by capillary electrophoresis with contactless conductivity detection

“…In FASI, the conductivity of the sample solution is lower than that of BGE. Theoretically, the amount of stacking is proportional to the conductivity difference between the running buffer and the sample solution . In practice, the analyte is usually dissolved in water or diluted buffer solution, which leads to a narrow higher concentration sample zone .…”

“…C 4 D features unprecedented ease of the cell arrangement and inherent prevention of the electrode fouling, and it is universal for all ionic compounds without derivatization or indirect approaches . On‐line preconcentration can be regarded as one of the major developments in CE specifically to overcome the sensitivity limitations . Jin described several stacking methods, such as a large‐volume stacking method, MEKC sweeping method, and selective‐exhaustive injection‐sweeping method, for detecting MEL in milk and infant formula, and an LOD of 0.01 ng/mL could be obtained.…”

Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips (2014–2016)

“…This review will highlight developments within the field of on‐line concentration for electrophoresis, in both capillaries and microchips and follows previous reviews on the topic published and compliments other reviews published over this time . This review does not aim to be comprehensive, and discusses 150 of the published papers that are of significance to the field published between July 2014 and June 2016.…”