Mass spectrometry of aromatic cyclic imides and amides. Part II: electron ionization induced decomposition of N-substituted 3,4-pyridinedicarboximides
摘要:
The behaviour of a series of N-substituted 3,4-pyridinedicarboximides under electron impact at 70 eV is analyzed. Compounds under study were divided into three groups: 3,4-pyridinedicarboximidoacetic, beta-3,4-pyridinedicarboximidopropionic and gamma-3,4-pyridinedicarboximidobutyric acid derivatives (compounds 1, 2 and 3 respectively), which in turn determine the dominant fragmentations. The proposed fragmentation patterns are supported by HRMS and tandem mass spectrometry. Results are in some cases compared to data from the related 2,3-pyridinedicarboximides 4.
The behaviour of a series of N-substituted 3,4-pyridinedicarboximides under electron impact at 70 eV is analyzed. Compounds under study were divided into three groups: 3,4-pyridinedicarboximidoacetic, beta-3,4-pyridinedicarboximidopropionic and gamma-3,4-pyridinedicarboximidobutyric acid derivatives (compounds 1, 2 and 3 respectively), which in turn determine the dominant fragmentations. The proposed fragmentation patterns are supported by HRMS and tandem mass spectrometry. Results are in some cases compared to data from the related 2,3-pyridinedicarboximides 4.
Supramolecular isomerism and structural flexibility in coordination networks sustained by cadmium rod building blocks
作者:Yassin H. Andaloussi、Andrey A. Bezrukov、Debobroto Sensharma、Michael J. Zaworotko
DOI:10.1039/d3ce00557g
日期:——
afford dia and sql topology coordinationnetworks of general formula ML2 that are based upon the MN2(CO2)2 molecular buildingblock (MBB). Herein, we report on a new N-donor carboxylate linker, β-(3,4-pyridinedicarboximido)propionate (PyImPr), which afforded Cd(PyImPr)2 via reaction of PyImPrH with Cd(acetate)2·2H2O. We observed that, depending upon whether Cd(PyImPr)2 was prepared by layering or solvothermal