NBr(b 1Σ+, v′), v′≤10 is produced by photolysis of BrN3 at 193 nm. Using this method, radiative decay rates for v′=0, 2, and 5 of the b 1Σ+ state were measured and were found to be ∼2.5×104 s−1. The rate constant for NBr(b) quenching by collisions with BrN3 was determined to be 1.57×10−10 cm3 s−1 for v′=0 and slightly faster for v′>0. The nascent vibration distribution of NBr(b 1Σ+) produced by 193 nm photolysis of BrN3 was found to be inverted, with a maximum population in v′=2. The overall quantum yield for production of NBr(b 1Σ+) by the photodissociation is 0.12.
Novel 6-methoxy and 6-thioalkyl-6-acylamido-penicillanic acids and their non-toxic pharmaceutically-acceptable salts, esters and amides which are useful as antibiotics. The products are prepared by treating an ester of 6-substituted-6-aminopenicillanic acid with an acylating agent followed by removal of the ester group. Also disclosed are novel intermediates.
Novel 6-methoxy and 6-thioalkyl-6-acylamidopenicillanic acids and their non-toxic pharmaceutically-acceptable salts, esters and amides which are useful as antibiotics. The products are prepared by treating an ester of 6-substituted-6-aminopenicillanic acid with an acylating agent followed by removal of the ester group. Also disclosed are novel intermediates.
Low viscosity azide-containing mono and dicationic ionic liquids with unsaturated side chain
作者:Reza Fareghi-Alamdari、Razieh Hatefipour
DOI:10.1016/j.molliq.2016.11.006
日期:2017.1
A new class of azide-functionalized monocationic and unsymmetrical dicationic ionic liquids (ILs) with low viscosity and high liquid range was synthesized. All of the synthesized ILs, were characterized by FT-IR, 1HNMR, 13CNMR spectroscopies and elemental analysis. Some thermophysical properties including melting point, density, shear viscosity, decomposition temperature and heat capacity of the unsymmetrical
Fluorescent chemosensors for metals based on dipyrrins
申请人:Bentley Paul A.
公开号:US20080182333A1
公开(公告)日:2008-07-31
The present invention is a new class of fluorescent sensor with unprecedented sensitivity, selectivity and synthetic efficiency for the identification and qualitative and quantitative detection of transition metal ions. The chemosensing properties are based on an internal charge transfer mechanism or photo-induced electron transfer and are effective in vitro. The chemosensor comprises one or more electron donating dipyrrin functionalities linked to an electron withdrawing functionality. The chemosensor forms a stable transition metal complex through internal charge transfer between the electron donating functionality and the target transition metal, which results in measurable fluorescence. Specific examples for sensing zinc and copper ions are described.