17090-79-8Relevant articles and documents
Spectroscopic, semi-empirical and antimicrobial studies of a new amide of monensin A with 4-aminobenzo-15-crown-5 and its complexes with Na+ cation at 1:1 and 1:2 ratios
?owicki, Daniel,Huczyński, Adam,Stefańska, Joanna,Brzezinski, Bogumil
, p. 1468 - 1478 (2011)
A new amide of monensin A with 4-aminobenzo-15-crown-5 (M-AM3) was synthesised and its ability to form complexes with Na+ cations was studied by ESIMS, 1H, 13C and 23Na NMR, FTIR and PM5 semi-empirical methods. ESI mass spectrometry indicates that in the gas phase M-AM3 amide forms complexes of 1:1 and 1:2 stoichiometry with Na + cations. The formation of such complexes is also confirmed in the acetonitrile solution, in which the existence of equilibrium between two structures A and B is found, of which B structure is dominant. The structures of M-AM3 and its 1:1 and 1:2 complexes with Na+ cations are stabilised by various intramolecular hydrogen bonds, which are discussed in detail. The in vitro biological tests have demonstrated that the new M-AM3 amide shows good activity towards some strains of Gram-positive bacteria (MIC 25-50 μg/ml).
1H, 13C NMR, FT-IR, ESI MS and PM5 studies of a new 3,6,9-trioxadecylamide of monensin A and its complexes with Li+, Na+ and K+ cations
?owicki, Daniel,Huczyński, Adam,Brzezinski, Bogumil,Bartl, Franz
experimental part, p. 121 - 131 (2011/04/23)
A new 3,6,9-trioxadecylamide of monensin A (M-AM4) has been synthesised and its ability to form complexes with Li+, Na+ and K + cations has been studied by ESI mass spectrometry, 1H and 13C NMR, FT-IR spectroscopy and PM5 semiempirical method. The ESI MS data indicate that M-AM4 forms complexes with Li+, Na+ and K+ of exclusively 1:1 stoichiometry which are stable up to cv = 70 V. The formation of the M-AM4-Na+ is strongly favoured. Above cv = 70 the fragmentation process is observed. The spectroscopic studies show that the structures of the M-AM4 and its complexes with the cations of 1:1 stoichiometry are stabilized by intramolecular hydrogen bonds in which the OH groups are always involved. The CO amide group is engaged in the complexation process of each cation. The M-AM4-K+ complex can also assume a structure in which the CO amide group does not participate in the complexation but the complexes of such structure do not dominate.
Spectroscopic, mass spectrometry, and semiempirical investigations of a new 2-(2-methoxyethoxy)ethyl ester of Monensin A and its complexes with monovalent cations
Huczyński, Adam,?owicki, Daniel,Brzezinski, Bogumil,Bartl, Franz
, p. 14 - 24 (2008/09/21)
A new 2-(2-methoxyethoxy)ethyl ester of Monensin A (MON7) has been synthesized and its capability of complex formation with Li+, Na+, and K+ cations has been studied by ESI MS, 1H and 13C NMR, FT-IR, and PM5 semiempirical methods. ESI mass spectrometry indicates that MON7 forms complexes with Li+, Na+, and K+ of exclusively 1:1 stoichiometry which are stable up to cv = 70 V. The formation of complexes between MON7 and Na+ cations is strongly favored. Starting from about cv = 90 V fragmentation of the respective complexes is observed, primarily characterized by several dehydration steps. The structures of the MON7 complexes with Li+, Na+, and K+ cations are stabilized by intramolecular hydrogen bonds in which the OH groups are always involved. The structures are visualized and discussed in detail. It has been proved that the formation of a pseudo crown ring structure formed by MON7 is preferred in complexes with Na+ cations.