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Université de Neuchâtel

0.35 μm 22μW Multiphase Programmable Clock Generator for Circular Memory SC FIR Filter For Wireless Sensor Applications

Dlugosz, Rafal Tomasz ; Iniewski, K. ; Talaśka, T.

In: IEEE Workshop on Signal Processing Systems (SIPS), 2006, vol. IM3, no. M3-5, p. 157-160

The paper presents the programmable multiphase clock generator for switched-capacitor finite impulse response (SC FIR) circular memory filters. The proposed programmable clock circuit enables easy division of such kind of filters into different orders smaller sections, which when connected in series, lead to increase in filter efficiency: reduction of chip area, power dissipation, and rising up...

Université de Neuchâtel

10 kHz linewidth mid-infrared quantum cascade laser by stabilization to an optical delay line

Shehzad, Atif ; Brochard, Pierre ; Matthey, Renaud ; Südmeyer, Thomas ; Schilt, Stéphane

In: Optics Letters, 2019, vol. 44, no. 4, p. 3470-3473

We present a mid-infrared quantum cascade laser (QCL) with a sub-10 kHz full width at half-maximum linewidth (at 1 s integration time) achieved by stabilization to a free-space optical delay line. The linear range in the center of a fringe detected at the output of an imbalanced Mach–Zehnder interferometer implemented with a short free-space pathlength difference of only 1 m is used as a...

Université de Neuchâtel

1,1′-Ferrocene dicarboxylic acid pyridin-4-yl ester: A new bidentate ligand in arene ruthenium chemistry

Auzias, Mathieu ; Therrien, Bruno ; Süss-Fink, Georg

In: Inorganic Chemistry Communications, 2007, vol. 10, no. 11, p. 1239-1243

1,1′-Ferrocene dicarboxylic acid pyridin-4-yl ester (1) is prepared from 1,1′-ferrocene dicarbonyl chloride and 4-hydroxypyridine. This new bidentate ferrocenoyl ligand reacts with the monocationic complex [(η6-p-cymene)2Ru2 (μ-OH)3]+ to give the dicationic complex...

Université de Neuchâtel

1,2-Bis-N-[2’-(diphenylphosphanyl)benzoyl]diaminobenzene, a New Chelating Ligand with Versatile Coordination Properties

Burger, Sylvain ; Therrien, Bruno ; Süss-Fink, Georg

In: European Journal of Inorganic Chemistry, 2003, vol. 17, p. 3099 - 3103

1,2-Bis-N-[2’-(diphenylphosphanyl)benzoyl]diaminobenzene (dppbH; 1) was prepared by peptidic coupling and shown to exist, in the solid state, in the form of hydrogen-bonded dimers by single-crystal X-ray structure analysis. As expected, 1 reacts with [MCl2 (cod)] (M = Pd, Pt; cod = cyclooctadiene) to form square-planar complexes. However, in the case of palladium...

Université de Neuchâtel

1,3-Butadienyl-thiocyanate in der Diels-Alder-Reaktion mit anschliessender [3,3]-sigmatroper Umlagerung = 1,3-Butadienyl Thiocyanates in the Diels-Alder Reaction Followed by a [3,3|-Sigmatropic Shift

Huber, Stefan ; Stamouli, Peristera ; Jenny, Titus ; Neier, Reinhard

In: Helvetica Chimica Acta, 1986, vol. 69, no. 8, p. 1898-1915

(E)- and (Z)-1,3-Butadienyl thiocyanates 3, 4, and 12-15 have been synthesized selectively. Their use as dienes for Diels-Alder reactions followed by a [3,3]-sigmatropic shift to obtain an isomeric isothiocyanate has been studied. The butadienyl thiocyanates are, unfortunately, not very reactive in Diels-Alder reactions. This disadvantage can be overcome,...