NEW USE FOR A COMPOUND AS A MATRIX IN THE SPECIFIC DETECTION, IDENTIFICATION AND/OR QUANTIFICATION OF ALKALOIDS BY MALDI-TOF MASS SPECTROMETRY
申请人:Dias Marylène
公开号:US20140319331A1
公开(公告)日:2014-10-30
There is provided (i) a method of analysing small molecules that may have a mass of <800 Da, in particular alkaloids, said method being generally referred to as MALDI-TOF-MS (or MALDI time-of-flight mass spectrometry), which is an acronym for a method of analysis by matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry. Also provided is (ii) a molecule according to formula (I) and the use of the molecule as a matrix in the analysis method.
pi-Dimer from Bithiophene Radical Cations. Investigation of Equilibrium Constants as a Function of Substituent Size and Supporting Electrolyte Using Fast Conversion Electrochemical Cells.
The procedure for the determination of second order equilibrium constants K, using spectroelectrochemistry has been re-examined. Incomplete conversion of the starting material led to non-homogeneous concentration profiles and to considerable errors in the determinations of K. Values for three dialkylthiobithiophene radical cations have been measured in which the size of the thioalkyl group and of the counter anion of the supporting electrolyte are different. Large decreases observed in both cases may suggest that the association takes the form of a sandwich of two radical cations with the counter-anion in the middle.
Impact of Molecular Symmetry on Single-Molecule Conductance
作者:Emma J. Dell、Brian Capozzi、Kateri H. DuBay、Timothy C. Berkelbach、Jose Ricardo Moreno、David R. Reichman、Latha Venkataraman、Luis M. Campos
DOI:10.1021/ja4055367
日期:2013.8.14
We have measured the single-molecule conductance of a family of bithiophene derivatives terminated with methylsulfide gold-binding linkers using a scanning tunneling microscope based break-junction technique. We find a broad distribution in the single-molecule conductance of bithiophene compared with that of a methylsulfide terminated biphenyl. Using a combination of experiments and calculations, we